Add DOCKER_HOST documentation (#74 )

* add DOCKER_HOST documentation * add which endpoints are required for DOCKER_HOST * Update README.md Co-authored-by: Frederik Ring <frederik.ring@gmail.com>
Add option to run pre/post commands for any container (#73 )
2025-12-05 17:18:02 +01:00 · 2022-02-22 08:00:26 +01:00 · 2022-02-22 07:53:33 +01:00 · 2022-02-22 07:49:24 +01:00 · 2022-02-18 09:08:21 +01:00 · 2022-02-15 21:05:03 +01:00
41 changed files with 4139 additions and 230 deletions
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -1,40 +1,69 @@
 version: 2.1

 jobs:
-  build:
-    docker:
-      - image: cimg/base:2020.06
+  canary:
+    machine:
+      image: ubuntu-2004:202201-02
    working_directory: ~/docker-volume-backup
    steps:
      - checkout
-      - setup_remote_docker
      - run:
          name: Build
-          command: make build
-      - run:
-          name: Check if image needs to be pushed
          command: |
-            if [[ -z "$CIRCLE_TAG" ]]; then
-              echo "Not a git tag, nothing to do ..."
-              circleci-agent step halt
-            fi
+            docker build . -t offen/docker-volume-backup:canary
+      - run:
+          name: Install gnupg
+          command: |
+            sudo apt-get install -y gnupg
+      - run:
+          name: Run tests
+          working_directory: ~/docker-volume-backup/test
+          command: |
+            export GPG_TTY=$(tty)
+            ./test.sh canary
+
+  build:
+    docker:
+      - image: cimg/base:2020.06
+        environment:
+          DOCKER_BUILDKIT: '1'
+          DOCKER_CLI_EXPERIMENTAL: enabled
+    working_directory: ~/docker-volume-backup
+    steps:
+      - checkout
+      - setup_remote_docker:
+          version: 20.10.6
      - docker/install-docker-credential-helper
      - docker/configure-docker-credentials-store
      - run:
          name: Push to Docker Hub
          command: |
            echo "$DOCKER_ACCESSTOKEN" | docker login --username offen --password-stdin
-            docker tag offen/docker-volume-backup:local offen/docker-volume-backup:$CIRCLE_TAG
-            docker tag offen/docker-volume-backup:local offen/docker-volume-backup:latest
-            docker push offen/docker-volume-backup:$CIRCLE_TAG
-            docker push offen/docker-volume-backup:latest
+            # This is required for building ARM: https://gitlab.alpinelinux.org/alpine/aports/-/issues/12406
+            docker run --rm --privileged linuxkit/binfmt:v0.8
+            docker context create docker-volume-backup
+            docker buildx create docker-volume-backup --name docker-volume-backup --use
+            docker buildx inspect --bootstrap
+            tag_args="-t offen/docker-volume-backup:$CIRCLE_TAG"
+            if [[ "$CIRCLE_TAG" =~ ^v[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
+              # prerelease tags like `v2.0.0-alpha.1` should not be released as `latest`
+              tag_args="$tag_args -t offen/docker-volume-backup:latest"
+            fi
+            docker buildx build --platform linux/amd64,linux/arm64,linux/arm/v7 \
+               $tag_args . --push

 workflows:
  version: 2
-  deploy:
+  docker_image:
    jobs:
+      - canary:
+          filters:
+            tags:
+              ignore: /^v.*/
      - build:
          filters:
+            branches:
+              ignore: /.*/
            tags:
              only: /^v.*/

--- a/.dockerignore
+++ b/.dockerignore
@@ -0,0 +1 @@
+test
--- a/.editorconfig
+++ b/.editorconfig
@@ -0,0 +1,18 @@
+# EditorConfig is awesome: http://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = space
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false
+
+[*.go]
+indent_style = tab
--- a/.github/ISSUE_TEMPLATE.md
+++ b/.github/ISSUE_TEMPLATE.md
@@ -0,0 +1,20 @@
+* **I'm submitting a ...**
+  - [ ] bug report
+  - [ ] feature request
+  - [ ] support request
+
+* **What is the current behavior?**
+
+* **If the current behavior is a bug, please provide the configuration and steps to reproduce and if possible a minimal demo of the problem.**
+
+* **What is the expected behavior?**
+
+* **What is the motivation / use case for changing the behavior?**
+
+* **Please tell us about your environment:**
+  
+  - Image version:
+  - Docker version: 
+  - docker-compose version:
+
+* **Other information** (e.g. detailed explanation, stacktraces, related issues, suggestions how to fix, links for us to have context, eg. stackoverflow, etc)
--- a/25
+++ b/25
@@ -1,19 +1,24 @@
 # Copyright 2021 - Offen Authors <hioffen@posteo.de>
-# SPDX-License-Identifier: MIT
+# SPDX-License-Identifier: MPL-2.0

-FROM alpine:3.13
+FROM golang:1.17-alpine as builder
+
+WORKDIR /app
+COPY go.mod go.sum ./
+RUN go mod download
+COPY cmd/backup ./cmd/backup/
+WORKDIR /app/cmd/backup
+RUN go build -o backup .
+
+FROM alpine:3.15

 WORKDIR /root

-RUN apk add --update ca-certificates docker openrc gnupg
-RUN rc-update add docker boot
+RUN apk add --update ca-certificates

-RUN wget https://dl.min.io/client/mc/release/linux-amd64/mc && \
-  chmod +x mc && \
-  mv mc /usr/bin/mc
+COPY --from=builder /app/cmd/backup/backup /usr/bin/backup

-COPY src/backup.sh src/entrypoint.sh /root/
-RUN chmod +x backup.sh && mv backup.sh /usr/bin/backup \
-  && chmod +x entrypoint.sh
+COPY ./entrypoint.sh /root/
+RUN chmod +x entrypoint.sh

 ENTRYPOINT ["/root/entrypoint.sh"]
--- a/5
+++ b/5
@@ -1,5 +0,0 @@
-DOCKER_TAG ?= local
-
-.PHONY: build
-build:
-	@docker build -t offen/docker-volume-backup:$(DOCKER_TAG) .
--- a/22
+++ b/22
@@ -1,22 +0,0 @@
-Copyright 2021 Offen Authors <hioffen@posteo.de>
-
-This project contains software that is Copyright (c) 2018 Futurice
-Licensed under the Terms of the MIT License:
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
--- a/README.md
+++ b/README.md
@@ -1,53 +1,60 @@
+<a href="https://www.offen.dev/">
+    <img src="https://offen.github.io/press-kit/offen-material/gfx-GitHub-Offen-logo.svg" alt="Offen logo" title="Offen" width="150px"/>
+</a>
+
 # docker-volume-backup

-Backup Docker volumes to any S3 compatible storage.
+Backup Docker volumes locally or to any S3 compatible storage.

-The [offen/docker-volume-backup](https://hub.docker.com/r/offen/docker-volume-backup) Docker image can be used as a sidecar container to an existing Docker setup. It handles recurring backups of Docker volumes to any S3 compatible storage and rotates away old backups if configured.
+The [offen/docker-volume-backup](https://hub.docker.com/r/offen/docker-volume-backup) Docker image can be used as a lightweight (below 15MB) sidecar container to an existing Docker setup.
+It handles __recurring or one-off backups of Docker volumes__ to a __local directory__, __any S3 or WebDAV compatible storage (or any combination) and rotates away old backups__ if configured. It also supports __encrypting your backups using GPG__ and __sending notifications for failed backup runs__.

-## Configuration
+<!-- MarkdownTOC -->

-Backup targets, schedule and retention are configured in environment variables:
+- [Quickstart](#quickstart)
+  - [Recurring backups in a compose setup](#recurring-backups-in-a-compose-setup)
+  - [One-off backups using Docker CLI](#one-off-backups-using-docker-cli)
+- [Configuration reference](#configuration-reference)
+- [How to](#how-to)
+  - [Stop containers during backup](#stop-containers-during-backup)
+  - [Automatically pruning old backups](#automatically-pruning-old-backups)
+  - [Send email notifications on failed backup runs](#send-email-notifications-on-failed-backup-runs)
+  - [Customize notifications](#customize-notifications)
+  - [Run custom commands before / after backup](#run-custom-commands-before--after-backup)
+  - [Encrypting your backup using GPG](#encrypting-your-backup-using-gpg)
+  - [Restoring a volume from a backup](#restoring-a-volume-from-a-backup)
+  - [Set the timezone the container runs in](#set-the-timezone-the-container-runs-in)
+  - [Using with Docker Swarm](#using-with-docker-swarm)
+  - [Manually triggering a backup](#manually-triggering-a-backup)
+  - [Update deprecated email configuration](#update-deprecated-email-configuration)
+  - [Using a custom Docker host](#using-a-custom-docker-host)
+- [Recipes](#recipes)
+  - [Backing up to AWS S3](#backing-up-to-aws-s3)
+  - [Backing up to Filebase](#backing-up-to-filebase)
+  - [Backing up to MinIO](#backing-up-to-minio)
+  - [Backing up to WebDAV](#backing-up-to-webdav)
+  - [Backing up locally](#backing-up-locally)
+  - [Backing up to AWS S3 as well as locally](#backing-up-to-aws-s3-as-well-as-locally)
+  - [Running on a custom cron schedule](#running-on-a-custom-cron-schedule)
+  - [Rotating away backups that are older than 7 days](#rotating-away-backups-that-are-older-than-7-days)
+  - [Encrypting your backups using GPG](#encrypting-your-backups-using-gpg)
+  - [Using mysqldump to prepare the backup](#using-mysqldump-to-prepare-the-backup)
+  - [Running multiple instances in the same setup](#running-multiple-instances-in-the-same-setup)
+- [Differences to `futurice/docker-volume-backup`](#differences-to-futuricedocker-volume-backup)

-```ini
-########### BACKUP SCHEDULE
+<!-- /MarkdownTOC -->

-# Backups run on the given cron schedule and use the filename defined in the
-# template expression.
+---

-BACKUP_CRON_EXPRESSION="0 2 * * *"
-BACKUP_FILENAME="offen-db-%Y-%m-%dT%H-%M-%S.tar.gz"
+Code and documentation for `v1` versions are found on [this branch][v1-branch].

-########### BACKUP STORAGE
+[v1-branch]: https://github.com/offen/docker-volume-backup/tree/v1

-# Define credentials for authenticating against the backup storage and a bucket
-# name. Although all of these values are `AWS`-prefixed, the setup can be used
-# with any S3 compatible storage.
+## Quickstart

-AWS_ACCESS_KEY_ID="<xxx>"
-AWS_SECRET_ACCESS_KEY="<xxx>"
-AWS_S3_BUCKET_NAME="<xxx>"
+### Recurring backups in a compose setup

-# This is the FQDN of your storage server, e.g. `storage.example.com`.
-# Do not set this when working against AWS S3.
-# AWS_ENDPOINT="<xxx>"
-
-########### BACKUP PRUNING
-
-# Define this value to enable automatic pruning of old backups. The value
-# declares the number of days for which a backup is kept.
-
-# BACKUP_RETENTION_DAYS="7"
-
-########### BACKUP ENCRYPTION
-
-# Backups can be encrypted using gpg in case a passphrase is given
-
-# GPG_PASSPHRASE="<xxx>"
-```
-
-## Example in a docker-compose setup
-
-Most likely, you will use this image as a sidecar container in an existing docker-compose setup like this:
+Add a `backup` service to your compose setup and mount the volumes you would like to see backed up:

 ```yml
 version: '3'
@@ -65,24 +72,843 @@ services:
      - docker-volume-backup.stop-during-backup=true

  backup:
+    # In production, it is advised to lock your image tag to a proper
+    # release version instead of using `latest`.
+    # Check https://github.com/offen/docker-volume-backup/releases
+    # for a list of available releases.
    image: offen/docker-volume-backup:latest
    restart: always
-    env_file: ./backup.env
+    env_file: ./backup.env # see below for configuration reference
    volumes:
+      - data:/backup/my-app-backup:ro
      # Mounting the Docker socket allows the script to stop and restart
      # the container during backup. You can omit this if you don't want
-      # to stop the container
+      # to stop the container. In case you need to proxy the socket, you can
+      # also provide a location by setting `DOCKER_HOST` in the container
      - /var/run/docker.sock:/var/run/docker.sock:ro
-      - data:/backup/my-app-backup:ro
+      # If you mount a local directory or volume to `/archive` a local
+      # copy of the backup will be stored there. You can override the
+      # location inside of the container by setting `BACKUP_ARCHIVE`.
+      # You can omit this if you do not want to keep local backups.
+      - /path/to/local_backups:/archive
 volumes:
  data:
 ```

+### One-off backups using Docker CLI
+
+To run a one time backup, mount the volume you would like to see backed up into a container and run the `backup` command:
+
+```console
+docker run --rm \
+  -v data:/backup/data \
+  --env AWS_ACCESS_KEY_ID="<xxx>" \
+  --env AWS_SECRET_ACCESS_KEY="<xxx>" \
+  --env AWS_S3_BUCKET_NAME="<xxx>" \
+  --entrypoint backup \
+  offen/docker-volume-backup:latest
+```
+
+Alternatively, pass a `--env-file` in order to use a full config as described below.
+
+## Configuration reference
+
+Backup targets, schedule and retention are configured in environment variables.
+You can populate below template according to your requirements and use it as your `env_file`:
+
+```ini
+########### BACKUP SCHEDULE
+
+# Backups run on the given cron schedule in `busybox` flavor. If no
+# value is set, `@daily` will be used. If you do not want the cron
+# to ever run, use `0 0 5 31 2 ?`.
+
+# BACKUP_CRON_EXPRESSION="0 2 * * *"
+
+# The name of the backup file including the `.tar.gz` extension.
+# Format verbs will be replaced as in `strftime`. Omitting them
+# will result in the same filename for every backup run, which means previous
+# versions will be overwritten on subsequent runs. The default results
+# in filenames like `backup-2021-08-29T04-00-00.tar.gz`.
+
+# BACKUP_FILENAME="backup-%Y-%m-%dT%H-%M-%S.tar.gz"
+
+# Setting BACKUP_FILENAME_EXPAND to true allows for environment variable
+# placeholders in BACKUP_FILENAME, BACKUP_LATEST_SYMLINK and in
+# BACKUP_PRUNING_PREFIX that will get expanded at runtime,
+# e.g. `backup-$HOSTNAME-%Y-%m-%dT%H-%M-%S.tar.gz`. Expansion happens before
+# interpolating strftime tokens. It is disabled by default.
+# Please note that you will need to escape the `$` when providing the value
+# in a docker-compose.yml file, i.e. using $$VAR instead of $VAR.
+
+# BACKUP_FILENAME_EXPAND="true"
+
+# When storing local backups, a symlink to the latest backup can be created
+# in case a value is given for this key. This has no effect on remote backups.
+
+# BACKUP_LATEST_SYMLINK="backup.latest.tar.gz"
+
+# Whether to copy the content of backup folder before creating the tar archive.
+# In the rare scenario where the content of the source backup volume is continously
+# updating, but we do not wish to stop the container while performing the backup,
+# this setting can be used to ensure the integrity of the tar.gz file.
+
+# BACKUP_FROM_SNAPSHOT="false"
+
+########### BACKUP STORAGE
+
+# The name of the remote bucket that should be used for storing backups. If
+# this is not set, no remote backups will be stored.
+
+# AWS_S3_BUCKET_NAME="backup-bucket"
+
+# If you want to store the backup in a non-root location on your bucket
+# you can provide a path. The path must not contain a leading slash.
+
+# AWS_S3_PATH="my/backup/location"
+
+# Define credentials for authenticating against the backup storage and a bucket
+# name. Although all of these keys are `AWS`-prefixed, the setup can be used
+# with any S3 compatible storage.
+
+# AWS_ACCESS_KEY_ID="<xxx>"
+# AWS_SECRET_ACCESS_KEY="<xxx>"
+
+# Instead of providing static credentials, you can also use IAM instance profiles
+# or similar to provide authentication. Some possible configuration options on AWS:
+# - EC2: http://169.254.169.254
+# - ECS: http://169.254.170.2
+
+# AWS_IAM_ROLE_ENDPOINT="http://169.254.169.254"
+
+# This is the FQDN of your storage server, e.g. `storage.example.com`.
+# Do not set this when working against AWS S3 (the default value is
+# `s3.amazonaws.com`). If you need to set a specific (non-https) protocol, you
+# will need to use the option below.
+
+# AWS_ENDPOINT="storage.example.com"
+
+# The protocol to be used when communicating with your storage server.
+# Defaults to "https". You can set this to "http" when communicating with
+# a different Docker container on the same host for example.
+
+# AWS_ENDPOINT_PROTO="https"
+
+# Setting this variable to `true` will disable verification of
+# SSL certificates. You shouldn't use this unless you use self-signed
+# certificates for your remote storage backend. This can only be used
+# when AWS_ENDPOINT_PROTO is set to `https`.
+
+# AWS_ENDPOINT_INSECURE="true"
+
+# You can also backup files to any WebDAV server:
+
+# The URL of the remote WebDAV server
+
+# WEBDAV_URL="https://webdav.example.com"
+
+# The Directory to place the backups to on the WebDAV server.
+# If the path is not present on the server it will be created.
+
+# WEBDAV_PATH="/my/directory/"
+
+# The username for the WebDAV server
+
+# WEBDAV_USERNAME="user"
+
+# The password for the WebDAV server
+
+# WEBDAV_PASSWORD="password"
+
+# In addition to storing backups remotely, you can also keep local copies.
+# Pass a container-local path to store your backups if needed. You also need to
+# mount a local folder or Docker volume into that location (`/archive`
+# by default) when running the container. In case the specified directory does
+# not exist (nothing is mounted) in the container when the backup is running,
+# local backups will be skipped. Local paths are also be subject to pruning of
+# old backups as defined below.
+
+# BACKUP_ARCHIVE="/archive"
+
+########### BACKUP PRUNING
+
+# **IMPORTANT, PLEASE READ THIS BEFORE USING THIS FEATURE**:
+# The mechanism used for pruning old backups is not very sophisticated
+# and applies its rules to **all files in the target directory** by default,
+# which means that if you are storing your backups next to other files,
+# these might become subject to deletion too. When using this option
+# make sure the backup files are stored in a directory used exclusively
+# for such files, or to configure BACKUP_PRUNING_PREFIX to limit
+# removal to certain files.
+
+# Define this value to enable automatic rotation of old backups. The value
+# declares the number of days for which a backup is kept.
+
+# BACKUP_RETENTION_DAYS="7"
+
+# In case the duration a backup takes fluctuates noticeably in your setup
+# you can adjust this setting to make sure there are no race conditions
+# between the backup finishing and the rotation not deleting backups that
+# sit on the edge of the time window. Set this value to a duration
+# that is expected to be bigger than the maximum difference of backups.
+# Valid values have a suffix of (s)econds, (m)inutes or (h)ours. By default,
+# one minute is used.
+
+# BACKUP_PRUNING_LEEWAY="1m"
+
+# In case your target bucket or directory contains other files than the ones
+# managed by this container, you can limit the scope of rotation by setting
+# a prefix value. This would usually be the non-parametrized part of your
+# BACKUP_FILENAME. E.g. if BACKUP_FILENAME is `db-backup-%Y-%m-%dT%H-%M-%S.tar.gz`,
+# you can set BACKUP_PRUNING_PREFIX to `db-backup-` and make sure
+# unrelated files are not affected by the rotation mechanism.
+
+# BACKUP_PRUNING_PREFIX="backup-"
+
+########### BACKUP ENCRYPTION
+
+# Backups can be encrypted using gpg in case a passphrase is given.
+
+# GPG_PASSPHRASE="<xxx>"
+
+########### STOPPING CONTAINERS DURING BACKUP
+
+# Containers can be stopped by applying a
+# `docker-volume-backup.stop-during-backup` label. By default, all containers
+# that are labeled with `true` will be stopped. If you need more fine grained
+# control (e.g. when running multiple containers based on this image), you can
+# override this default by specifying a different value here.
+
+# BACKUP_STOP_CONTAINER_LABEL="service1"
+
+########### EXECUTING COMMANDS IN CONTAINERS PRE/POST BACKUP
+
+# It is possible to define commands to be run in any container before and after
+# a backup is conducted. The commands themselves are defined in labels like
+# `docker-volume-backup.exec-pre=/bin/sh -c 'mysqldump [options] > dump.sql'.
+# Several options exist for controlling this feature:
+
+# By default, any output of such a command is suppressed. If this value
+# is configured to be "true", command execution output will be forwarded to
+# the backup container's stdout and stderr.
+
+# EXEC_FORWARD_OUTPUT="true"
+
+# Without any further configuration, all commands defined in labels will be
+# run before and after a backup. If you need more fine grained control, you
+# can use this option to set a label that will be used for narrowing down
+# the set of eligible containers. When set, an eligible container will also need
+# to be labeled as `docker-volume-backup.exec-label=database`.
+
+# EXEC_LABEL="database"
+
+########### NOTIFICATIONS
+
+# Notifications (email, Slack, etc.) can be sent out when a backup run finishes.
+# Configuration is provided as a comma-separated list of URLs as consumed
+# by `shoutrrr`: https://containrrr.dev/shoutrrr/v0.5/services/overview/
+# The content of such notifications can be customized. Dedicated documentation
+# on how to do this can be found in the README. When providing multiple URLs or
+# an URL that contains a comma, the values can be URL encoded to avoid ambiguities.
+
+# The below URL demonstrates how to send an email using the provided SMTP
+# configuration and credentials.
+
+# NOTIFICATION_URLS=smtp://username:password@host:587/?fromAddress=sender@example.com&toAddresses=recipient@example.com
+
+# By default, notifications would only be sent out when a backup run fails
+# To receive notifications for every run, set `NOTIFICATION_LEVEL` to `info`
+# instead of the default `error`.
+
+# NOTIFICATION_LEVEL="error"
+
+########### DOCKER HOST
+
+# If you are interfacing with Docker via TCP you can set the Docker host here
+# instead of mounting the Docker socket as a volume. This is unset by default.
+
+# DOCKER_HOST="tcp://docker_socket_proxy:2375"
+
+########### EMAIL NOTIFICATIONS
+
+# ************************************************************************
+# Providing notification configuration like this has been deprecated
+# and will be removed in the next major version. Please use NOTIFICATION_URLS
+# as documented above instead.
+# ************************************************************************
+
+# In case SMTP credentials are provided, notification emails can be sent out when
+# a backup run finished. These emails will contain the start time, the error
+# message on failure and all prior log output.
+
+# The recipient(s) of the notification. Supply a comma separated list
+# of adresses if you want to notify multiple recipients. If this is
+# not set, no emails will be sent.
+
+# EMAIL_NOTIFICATION_RECIPIENT="you@example.com"
+
+# The "From" header of the sent email. Defaults to `noreply@nohost`.
+
+# EMAIL_NOTIFICATION_SENDER="no-reply@example.com"
+
+# Configuration and credentials for the SMTP server to be used.
+# EMAIL_SMTP_PORT defaults to 587.
+
+# EMAIL_SMTP_HOST="posteo.de"
+# EMAIL_SMTP_PASSWORD="<xxx>"
+# EMAIL_SMTP_USERNAME="no-reply@example.com"
+# EMAIL_SMTP_PORT="<port>"
+```
+
+In case you encouter double quoted values in your configuration you might be running an [older version of `docker-compose`].
+You can work around this by either updating `docker-compose` or unquoting your configuration values.
+
+[compose-issue]: https://github.com/docker/compose/issues/2854
+
+## How to
+
+### Stop containers during backup
+
+In many cases, it will be desirable to stop the services that are consuming the volume you want to backup in order to ensure data integrity.
+This image can automatically stop and restart containers and services (in case you are running Docker in Swarm mode).
+By default, any container that is labeled `docker-volume-backup.stop-during-backup=true` will be stopped before the backup is being taken and restarted once it has finished.
+
+In case you need more fine grained control about which containers should be stopped (e.g. when backing up multiple volumes on different schedules), you can set the `BACKUP_STOP_CONTAINER_LABEL` environment variable and then use the same value for labeling:
+
+```yml
+version: '3'
+
+services:
+  app:
+    # definition for app ...
+    labels:
+      - docker-volume-backup.stop-during-backup=service1
+
+  backup:
+    image: offen/docker-volume-backup:latest
+    environment:
+      BACKUP_STOP_CONTAINER_LABEL: service1
+    volumes:
+      - data:/backup/my-app-backup:ro
+      - /var/run/docker.sock:/var/run/docker.sock:ro
+
+volumes:
+  data:
+```
+
+### Automatically pruning old backups
+
+When `BACKUP_RETENTION_DAYS` is configured, the image will check if there are any backups in the remote bucket or local archive that are older than the given retention value and rotate these backups away.
+
+Be aware that this mechanism looks at __all files in the target bucket or archive__, which means that other files that are older than the given deadline are deleted as well. In case you need to use a target that cannot be used exclusively for your backups, you can configure `BACKUP_PRUNING_PREFIX` to limit which files are considered eligible for deletion:
+
+```yml
+version: '3'
+
+services:
+  # ... define other services using the `data` volume here
+  backup:
+    image: offen/docker-volume-backup:latest
+    environment:
+      BACKUP_FILENAME: backup-%Y-%m-%dT%H-%M-%S.tar.gz
+      BACKUP_PRUNING_PREFIX: backup-
+      BACKUP_RETENTION_DAYS: 7
+    volumes:
+      - ${HOME}/backups:/archive
+      - data:/backup/my-app-backup:ro
+      - /var/run/docker.sock:/var/run/docker.sock:ro
+
+volumes:
+  data:
+```
+
+### Send email notifications on failed backup runs
+
+To send out email notifications on failed backup runs, provide SMTP credentials, a sender and a recipient:
+
+```yml
+version: '3'
+
+services:
+  backup:
+    image: offen/docker-volume-backup:latest
+    environment:
+      # ... other configuration values go here
+      NOTIFICATION_URLS=smtp://me:secret@smtp.example.com:587/?fromAddress=no-reply@example.com&toAddresses=you@example.com
+```
+
+Notification backends other than email are also supported.
+Refer to the documentation of [shoutrrr][shoutrrr-docs] to find out about options and configuration.
+
+[shoutrrr-docs]: https://containrrr.dev/shoutrrr/v0.5/services/overview/
+
+### Customize notifications
+
+The title and body of the notifications can be easily tailored to your needs using [go templates](https://pkg.go.dev/text/template).
+Templates must be mounted inside the container in `/etc/dockervolumebackup/notifications.d/`: any file inside this directory will be parsed.
+
+The files have to define [nested templates](https://pkg.go.dev/text/template#hdr-Nested_template_definitions) in order to override the original values. An example:
+```
+{{ define "title_success" -}}
+✅ Successfully ran backup {{ .Config.BackupStopContainerLabel }}
+{{- end }}
+
+{{ define "body_success" -}}
+▶️ Start time: {{ .Stats.StartTime | formatTime }}
+⏹️ End time: {{ .Stats.EndTime | formatTime }}
+⌛ Took time: {{ .Stats.TookTime }}
+🛑 Stopped containers: {{ .Stats.Containers.Stopped }}/{{ .Stats.Containers.All }} ({{ .Stats.Containers.StopErrors }} errors)
+⚖️ Backup size: {{ .Stats.BackupFile.Size | formatBytesBin }} / {{ .Stats.BackupFile.Size | formatBytesDec }}
+🗑️ Pruned backups: {{ .Stats.Storages.Local.Pruned }}/{{ .Stats.Storages.Local.Total }} ({{ .Stats.Storages.Local.PruneErrors }} errors)
+{{- end }}
+```
+
+Overridable template names are: `title_success`, `body_success`, `title_failure`, `body_failure`.
+
+For a full list of available variables and functions, see [this page](https://github.com/offen/docker-volume-backup/blob/master/docs/NOTIFICATION-TEMPLATES.md).
+
+### Run custom commands before / after backup
+
+In certain scenarios it can be required to run specific commands before and after a backup is taken (e.g. dumping a database).
+When mounting the Docker socket into the `docker-volume-backup` container, you can define pre- and post-commands that will be run in the context of the target container.
+Such commands are defined by specifying the command in a `docker-volume-backup.exec-[pre|post]` label.
+
+Taking a database dump using `mysqldump` would look like this:
+
+```yml
+version: '3'
+
+services:
+  # ... define other services using the `data` volume here
+  database:
+    image: mariadb
+    volumes:
+      - backup_data:/tmp/backups
+    labels:
+      - docker-volume-backup.exec-pre=/bin/sh -c 'mysqldump --all-databases > /backups/dump.sql'
+
+volumes:
+  backup_data:
+```
+
+Due to Docker limitations, you currently cannot use any kind of redirection in these commands unless you pass the command to `/bin/sh -c` or similar.
+I.e. instead of using `echo "ok" > ok.txt` you will need to use `/bin/sh -c 'echo "ok" > ok.txt'`.
+
+If you need fine grained control about which container's commands are run, you can use the `EXEC_LABEL` configuration on your `docker-volume-backup` container:
+
+```yml
+version: '3'
+
+services:
+  database:
+    image: mariadb
+    volumes:
+      - backup_data:/tmp/backups
+    labels:
+      - docker-volume-backup.exec-pre=/bin/sh -c 'mysqldump --all-databases > /tmp/volume/dump.sql'
+      - docker-volume-backup.exec-label=database
+
+  backup:
+    image: offen/docker-volume-backup:latest
+    environment:
+      EXEC_LABEL: database
+    volumes:
+      - data:/backup/dump:ro
+      - /var/run/docker.sock:/var/run/docker.sock:ro
+
+volumes:
+  backup_data:
+```
+
+
+The backup procedure is guaranteed to wait for all `pre` commands to finish.
+However there are no guarantees about the order in which they are run, which could also happen concurrently.
+
+### Encrypting your backup using GPG
+
+The image supports encrypting backups using GPG out of the box.
+In case a `GPG_PASSPHRASE` environment variable is set, the backup will be encrypted using the given key and saved as a `.gpg` file instead.
+
+Assuming you have `gpg` installed, you can decrypt such a backup using (your OS will prompt for the passphrase before decryption can happen):
+
+```console
+gpg -o backup.tar.gz -d backup.tar.gz.gpg
+```
+
+### Restoring a volume from a backup
+
+In case you need to restore a volume from a backup, the most straight forward procedure to do so would be:
+
+- Stop the container(s) that are using the volume
+- Untar the backup you want to restore
+  ```console
+  tar -C /tmp -xvf  backup.tar.gz
+  ```
+- Using a temporary once-off container, mount the volume (the example assumes it's named `data`) and copy over the backup. Make sure you copy the correct path level (this depends on how you mount your volume into the backup container), you might need to strip some leading elements
+  ```console
+  docker run -d --name temp_restore_container -v data:/backup_restore alpine
+  docker cp /tmp/backup/data-backup temp_restore_container:/backup_restore
+  docker stop temp_restore_container
+  docker rm temp_restore_container
+  ```
+- Restart the container(s) that are using the volume
+
+Depending on your setup and the application(s) you are running, this might involve other steps to be taken still.
+
+### Set the timezone the container runs in
+
+By default a container based on this image will run in the UTC timezone.
+As the image is designed to be as small as possible, additional timezone data is not included.
+In case you want to run your cron rules in your local timezone (respecting DST and similar), you can mount your Docker host's `/etc/timezone` and `/etc/localtime` in read-only mode:
+
+```yml
+version: '3'
+
+services:
+  backup:
+    image: offen/docker-volume-backup:latest
+    volumes:
+      - data:/backup/my-app-backup:ro
+      - /etc/timezone:/etc/timezone:ro
+      - /etc/localtime:/etc/localtime:ro
+
+volumes:
+  data:
+```
+
+### Using with Docker Swarm
+
+By default, Docker Swarm will restart stopped containers automatically, even when manually stopped.
+If you plan to have your containers / services stopped during backup, this means you need to apply the `on-failure` restart policy to your service's definitions.
+A restart policy of `always` is not compatible with this tool.
+
+---
+
+When running in Swarm mode, it's also advised to set a hard memory limit on your service (~25MB should be enough in most cases, but if you backup large files above half a gigabyte or similar, you might have to raise this in case the backup exits with `Killed`):
+
+```yml
+services:
+  backup:
+    image: offen/docker-volume-backup:latest
+    deployment:
+      resources:
+        limits:
+          memory: 25M
+```
+
+### Manually triggering a backup
+
+You can manually trigger a backup run outside of the defined cron schedule by executing the `backup` command inside the container:
+
+```
+docker exec <container_ref> backup
+```
+
+### Update deprecated email configuration
+
+Starting with version 2.6.0, configuring email notifications using `EMAIL_*` keys has been deprecated.
+Instead of providing multiple values using multiple keys, you can now provide a single URL for `NOTIFICATION_URLS`.
+
+Before:
+```ini
+EMAIL_NOTIFICATION_RECIPIENT="you@example.com"
+EMAIL_NOTIFICATION_SENDER="no-reply@example.com"
+EMAIL_SMTP_HOST="posteo.de"
+EMAIL_SMTP_PASSWORD="secret"
+EMAIL_SMTP_USERNAME="me"
+EMAIL_SMTP_PORT="587"
+```
+
+After:
+```ini
+NOTIFICATION_URLS=smtp://me:secret@posteo.de:587/?fromAddress=no-reply@example.com&toAddresses=you@example.com
+```
+
+### Using a custom Docker host
+
+If you are interfacing with Docker via TCP, set `DOCKER_HOST` to the correct URL.
+```ini
+DOCKER_HOST=tcp://docker_socket_proxy:2375
+```
+
+In case you are using a socket proxy, it must support `GET` and `POST` requests to the `/containers` endpoint. If you are using Docker Swarm, it must also support the `/services` endpoint.
+
+## Recipes
+
+This section lists configuration for some real-world use cases that you can mix and match according to your needs.
+
+### Backing up to AWS S3
+
+```yml
+version: '3'
+
+services:
+  # ... define other services using the `data` volume here
+  backup:
+    image: offen/docker-volume-backup:latest
+    environment:
+      AWS_BUCKET_NAME: backup-bucket
+      AWS_ACCESS_KEY_ID: AKIAIOSFODNN7EXAMPLE
+      AWS_SECRET_ACCESS_KEY: wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY
+    volumes:
+      - data:/backup/my-app-backup:ro
+      - /var/run/docker.sock:/var/run/docker.sock:ro
+
+volumes:
+  data:
+```
+
+### Backing up to Filebase
+
+```yml
+version: '3'
+
+services:
+  # ... define other services using the `data` volume here
+  backup:
+    image: offen/docker-volume-backup:latest
+    environment:
+      AWS_ENDPOINT: s3.filebase.com
+      AWS_BUCKET_NAME: filebase-bucket
+      AWS_ACCESS_KEY_ID: FILEBASE-ACCESS-KEY
+      AWS_SECRET_ACCESS_KEY: FILEBASE-SECRET-KEY
+    volumes:
+      - data:/backup/my-app-backup:ro
+      - /var/run/docker.sock:/var/run/docker.sock:ro
+
+volumes:
+  data:
+```
+
+### Backing up to MinIO
+
+```yml
+version: '3'
+
+services:
+  # ... define other services using the `data` volume here
+  backup:
+    image: offen/docker-volume-backup:latest
+    environment:
+      AWS_ENDPOINT: minio.example.com
+      AWS_BUCKET_NAME: backup-bucket
+      AWS_ACCESS_KEY_ID: MINIOACCESSKEY
+      AWS_SECRET_ACCESS_KEY: MINIOSECRETKEY
+    volumes:
+      - data:/backup/my-app-backup:ro
+      - /var/run/docker.sock:/var/run/docker.sock:ro
+
+volumes:
+  data:
+```
+
+### Backing up to WebDAV
+
+```yml
+version: '3'
+
+services:
+  # ... define other services using the `data` volume here
+  backup:
+    image: offen/docker-volume-backup:latest
+    environment:
+      WEBDAV_URL: https://webdav.mydomain.me
+      WEBDAV_PATH: /my/directory/
+      WEBDAV_USERNAME: user
+      WEBDAV_PASSWORD: password
+    volumes:
+      - data:/backup/my-app-backup:ro
+      - /var/run/docker.sock:/var/run/docker.sock:ro
+
+volumes:
+  data:
+```
+
+### Backing up locally
+
+```yml
+version: '3'
+
+services:
+  # ... define other services using the `data` volume here
+  backup:
+    image: offen/docker-volume-backup:latest
+    environment:
+      BACKUP_FILENAME: backup-%Y-%m-%dT%H-%M-%S.tar.gz
+      BACKUP_LATEST_SYMLINK: backup-latest.tar.gz
+    volumes:
+      - data:/backup/my-app-backup:ro
+      - /var/run/docker.sock:/var/run/docker.sock:ro
+      - ${HOME}/backups:/archive
+
+volumes:
+  data:
+```
+
+### Backing up to AWS S3 as well as locally
+
+```yml
+version: '3'
+
+services:
+  # ... define other services using the `data` volume here
+  backup:
+    image: offen/docker-volume-backup:latest
+    environment:
+      AWS_BUCKET_NAME: backup-bucket
+      AWS_ACCESS_KEY_ID: AKIAIOSFODNN7EXAMPLE
+      AWS_SECRET_ACCESS_KEY: wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY
+    volumes:
+      - data:/backup/my-app-backup:ro
+      - /var/run/docker.sock:/var/run/docker.sock:ro
+      - ${HOME}/backups:/archive
+
+volumes:
+  data:
+```
+
+### Running on a custom cron schedule
+
+```yml
+version: '3'
+
+services:
+  # ... define other services using the `data` volume here
+  backup:
+    image: offen/docker-volume-backup:latest
+    environment:
+      # take a backup on every hour
+      BACKUP_CRON_EXPRESSION: "0 * * * *"
+      AWS_BUCKET_NAME: backup-bucket
+      AWS_ACCESS_KEY_ID: AKIAIOSFODNN7EXAMPLE
+      AWS_SECRET_ACCESS_KEY: wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY
+    volumes:
+      - data:/backup/my-app-backup:ro
+      - /var/run/docker.sock:/var/run/docker.sock:ro
+
+volumes:
+  data:
+```
+
+### Rotating away backups that are older than 7 days
+
+```yml
+version: '3'
+
+services:
+  # ... define other services using the `data` volume here
+  backup:
+    image: offen/docker-volume-backup:latest
+    environment:
+      AWS_BUCKET_NAME: backup-bucket
+      AWS_ACCESS_KEY_ID: AKIAIOSFODNN7EXAMPLE
+      AWS_SECRET_ACCESS_KEY: wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY
+      BACKUP_FILENAME: backup-%Y-%m-%dT%H-%M-%S.tar.gz
+      BACKUP_PRUNING_PREFIX: backup-
+      BACKUP_RETENTION_DAYS: 7
+    volumes:
+      - data:/backup/my-app-backup:ro
+      - /var/run/docker.sock:/var/run/docker.sock:ro
+
+volumes:
+  data:
+```
+
+### Encrypting your backups using GPG
+
+```yml
+version: '3'
+
+services:
+  # ... define other services using the `data` volume here
+  backup:
+    image: offen/docker-volume-backup:latest
+    environment:
+      AWS_BUCKET_NAME: backup-bucket
+      AWS_ACCESS_KEY_ID: AKIAIOSFODNN7EXAMPLE
+      AWS_SECRET_ACCESS_KEY: wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY
+      GPG_PASSPHRASE: somesecretstring
+    volumes:
+      - data:/backup/my-app-backup:ro
+      - /var/run/docker.sock:/var/run/docker.sock:ro
+
+volumes:
+  data:
+```
+
+### Using mysqldump to prepare the backup
+
+```yml
+version: '3'
+
+services:
+  database:
+    image: mariadb:latest
+    labels:
+      - docker-volume-backup.exec-pre=/bin/sh -c 'mysqldump -psecret --all-databases > /tmp/dumps/dump.sql'
+    volumes:
+      - app_data:/tmp/dumps
+  backup:
+    image: offen/docker-volume-backup:latest
+    environment:
+      BACKUP_FILENAME: db.tar.gz
+      BACKUP_CRON_EXPRESSION: "0 2 * * *"
+    volumes:
+      - ./local:/archive
+      - data:/backup/data:ro
+      - /var/run/docker.sock:/var/run/docker.sock
+
+volumes:
+  data:
+```
+
+### Running multiple instances in the same setup
+
+```yml
+version: '3'
+
+services:
+  # ... define other services using the `data_1` and `data_2` volumes here
+  backup_1: &backup_service
+    image: offen/docker-volume-backup:latest
+    environment: &backup_environment
+      BACKUP_CRON_EXPRESSION: "0 2 * * *"
+      AWS_BUCKET_NAME: backup-bucket
+      AWS_ACCESS_KEY_ID: AKIAIOSFODNN7EXAMPLE
+      AWS_SECRET_ACCESS_KEY: wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY
+      # Label the container using the `data_1` volume as `docker-volume-backup.stop-during-backup=service1`
+      BACKUP_STOP_CONTAINER_LABEL: service1
+    volumes:
+      - data_1:/backup/data-1-backup:ro
+      - /var/run/docker.sock:/var/run/docker.sock:ro
+  backup_2:
+    <<: *backup_service
+    environment:
+      <<: *backup_environment
+      # Label the container using the `data_2` volume as `docker-volume-backup.stop-during-backup=service2`
+      BACKUP_CRON_EXPRESSION: "0 3 * * *"
+      BACKUP_STOP_CONTAINER_LABEL: service2
+    volumes:
+      - data_2:/backup/data-2-backup:ro
+      - /var/run/docker.sock:/var/run/docker.sock:ro
+
+volumes:
+  data_1:
+  data_2:
+```
+
 ## Differences to `futurice/docker-volume-backup`

-This image is heavily inspired by the `futurice/docker-volume-backup`. We decided to publish this image as a simpler and more lightweight alternative because of the following requirements:
+This image is heavily inspired by `futurice/docker-volume-backup`. We decided to publish this image as a simpler and more lightweight alternative because of the following requirements:

- The original image is based on `ubuntu`, making it very heavy. This version is roughly 1/3 in compressed size.
- This image makes use of the MinIO client `mc` instead of the full blown AWS CLI for uploading backups.
- The original image proposed to handle backup rotation through AWS S3 lifecycle policies. This image adds the option to rotate old backups through the same script so this functionality can also be offered for non-AWS storage backends like MinIO.
- InfluxDB specific functionality was removed.
+- The original image is based on `ubuntu` and requires additional tools, making it heavy.
+This version is roughly 1/25 in compressed size (it's ~12MB).
+- The original image uses a shell script, when this version is written in Go.
+- The original image proposed to handle backup rotation through AWS S3 lifecycle policies.
+This image adds the option to rotate away old backups through the same command so this functionality can also be offered for non-AWS storage backends like MinIO.
+Local copies of backups can also be pruned once they reach a certain age.
+- InfluxDB specific functionality from the original image was removed.
+- `arm64` and `arm/v7` architectures are supported.
+- Docker in Swarm mode is supported.
+- Notifications on finished backups are supported.
+- IAM authentication through instance profiles is supported.
--- a/cmd/backup/archive.go
+++ b/cmd/backup/archive.go
@@ -0,0 +1,142 @@
+// Copyright 2022 - Offen Authors <hioffen@posteo.de>
+// SPDX-License-Identifier: MPL-2.0
+
+// Portions of this file are taken from package `targz`, Copyright (c) 2014 Fredrik Wallgren
+// Licensed under the MIT License: https://github.com/walle/targz/blob/57fe4206da5abf7dd3901b4af3891ec2f08c7b08/LICENSE
+
+package main
+
+import (
+	"archive/tar"
+	"compress/gzip"
+	"fmt"
+	"io"
+	"io/fs"
+	"os"
+	"path"
+	"path/filepath"
+	"strings"
+)
+
+func createArchive(inputFilePath, outputFilePath string) error {
+	inputFilePath = stripTrailingSlashes(inputFilePath)
+	inputFilePath, outputFilePath, err := makeAbsolute(inputFilePath, outputFilePath)
+	if err != nil {
+		return fmt.Errorf("createArchive: error transposing given file paths: %w", err)
+	}
+	if err := os.MkdirAll(filepath.Dir(outputFilePath), 0755); err != nil {
+		return fmt.Errorf("createArchive: error creating output file path: %w", err)
+	}
+
+	if err := compress(inputFilePath, outputFilePath, filepath.Dir(inputFilePath)); err != nil {
+		return fmt.Errorf("createArchive: error creating archive: %w", err)
+	}
+
+	return nil
+}
+
+func stripTrailingSlashes(path string) string {
+	if len(path) > 0 && path[len(path)-1] == '/' {
+		path = path[0 : len(path)-1]
+	}
+
+	return path
+}
+
+func makeAbsolute(inputFilePath, outputFilePath string) (string, string, error) {
+	inputFilePath, err := filepath.Abs(inputFilePath)
+	if err == nil {
+		outputFilePath, err = filepath.Abs(outputFilePath)
+	}
+
+	return inputFilePath, outputFilePath, err
+}
+
+func compress(inPath, outFilePath, subPath string) error {
+	file, err := os.Create(outFilePath)
+	if err != nil {
+		return fmt.Errorf("compress: error creating out file: %w", err)
+	}
+
+	prefix := path.Dir(outFilePath)
+	gzipWriter := gzip.NewWriter(file)
+	tarWriter := tar.NewWriter(gzipWriter)
+
+	var paths []string
+	if err := filepath.WalkDir(inPath, func(path string, di fs.DirEntry, err error) error {
+		paths = append(paths, path)
+		return err
+	}); err != nil {
+		return fmt.Errorf("compress: error walking filesystem tree: %w", err)
+	}
+
+	for _, p := range paths {
+		if err := writeTarGz(p, tarWriter, prefix); err != nil {
+			return fmt.Errorf("compress error writing %s to archive: %w", p, err)
+		}
+	}
+
+	err = tarWriter.Close()
+	if err != nil {
+		return fmt.Errorf("compress: error closing tar writer: %w", err)
+	}
+
+	err = gzipWriter.Close()
+	if err != nil {
+		return fmt.Errorf("compress: error closing gzip writer: %w", err)
+	}
+
+	err = file.Close()
+	if err != nil {
+		return fmt.Errorf("compress: error closing file: %w", err)
+	}
+
+	return nil
+}
+
+func writeTarGz(path string, tarWriter *tar.Writer, prefix string) error {
+	fileInfo, err := os.Lstat(path)
+	if err != nil {
+		return fmt.Errorf("writeTarGz: error getting file infor for %s: %w", path, err)
+	}
+
+	if fileInfo.Mode()&os.ModeSocket == os.ModeSocket {
+		return nil
+	}
+
+	var link string
+	if fileInfo.Mode()&os.ModeSymlink == os.ModeSymlink {
+		var err error
+		if link, err = os.Readlink(path); err != nil {
+			return fmt.Errorf("writeTarGz: error resolving symlink %s: %w", path, err)
+		}
+	}
+
+	header, err := tar.FileInfoHeader(fileInfo, link)
+	if err != nil {
+		return fmt.Errorf("writeTarGz: error getting file info header: %w", err)
+	}
+	header.Name = strings.TrimPrefix(path, prefix)
+
+	err = tarWriter.WriteHeader(header)
+	if err != nil {
+		return fmt.Errorf("writeTarGz: error writing file info header: %w", err)
+	}
+
+	if !fileInfo.Mode().IsRegular() {
+		return nil
+	}
+
+	file, err := os.Open(path)
+	if err != nil {
+		return fmt.Errorf("writeTarGz: error opening %s: %w", path, err)
+	}
+	defer file.Close()
+
+	_, err = io.Copy(tarWriter, file)
+	if err != nil {
+		return fmt.Errorf("writeTarGz: error copying %s to tar writer: %w", path, err)
+	}
+
+	return nil
+}
--- a/cmd/backup/config.go
+++ b/cmd/backup/config.go
@@ -0,0 +1,44 @@
+// Copyright 2022 - Offen Authors <hioffen@posteo.de>
+// SPDX-License-Identifier: MPL-2.0
+
+package main
+
+import "time"
+
+// Config holds all configuration values that are expected to be set
+// by users.
+type Config struct {
+	BackupSources              string        `split_words:"true" default:"/backup"`
+	BackupFilename             string        `split_words:"true" default:"backup-%Y-%m-%dT%H-%M-%S.tar.gz"`
+	BackupFilenameExpand       bool          `split_words:"true"`
+	BackupLatestSymlink        string        `split_words:"true"`
+	BackupArchive              string        `split_words:"true" default:"/archive"`
+	BackupRetentionDays        int32         `split_words:"true" default:"-1"`
+	BackupPruningLeeway        time.Duration `split_words:"true" default:"1m"`
+	BackupPruningPrefix        string        `split_words:"true"`
+	BackupStopContainerLabel   string        `split_words:"true" default:"true"`
+	BackupFromSnapshot         bool          `split_words:"true"`
+	AwsS3BucketName            string        `split_words:"true"`
+	AwsS3Path                  string        `split_words:"true"`
+	AwsEndpoint                string        `split_words:"true" default:"s3.amazonaws.com"`
+	AwsEndpointProto           string        `split_words:"true" default:"https"`
+	AwsEndpointInsecure        bool          `split_words:"true"`
+	AwsAccessKeyID             string        `envconfig:"AWS_ACCESS_KEY_ID"`
+	AwsSecretAccessKey         string        `split_words:"true"`
+	AwsIamRoleEndpoint         string        `split_words:"true"`
+	GpgPassphrase              string        `split_words:"true"`
+	NotificationURLs           []string      `envconfig:"NOTIFICATION_URLS"`
+	NotificationLevel          string        `split_words:"true" default:"error"`
+	EmailNotificationRecipient string        `split_words:"true"`
+	EmailNotificationSender    string        `split_words:"true" default:"noreply@nohost"`
+	EmailSMTPHost              string        `envconfig:"EMAIL_SMTP_HOST"`
+	EmailSMTPPort              int           `envconfig:"EMAIL_SMTP_PORT" default:"587"`
+	EmailSMTPUsername          string        `envconfig:"EMAIL_SMTP_USERNAME"`
+	EmailSMTPPassword          string        `envconfig:"EMAIL_SMTP_PASSWORD"`
+	WebdavUrl                  string        `split_words:"true"`
+	WebdavPath                 string        `split_words:"true" default:"/"`
+	WebdavUsername             string        `split_words:"true"`
+	WebdavPassword             string        `split_words:"true"`
+	ExecLabel                  string        `split_words:"true"`
+	ExecForwardOutput          bool          `split_words:"true"`
+}
--- a/cmd/backup/exec.go
+++ b/cmd/backup/exec.go
@@ -0,0 +1,122 @@
+// Copyright 2022 - Offen Authors <hioffen@posteo.de>
+// SPDX-License-Identifier: MPL-2.0
+
+package main
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"strings"
+	"sync"
+
+	"github.com/cosiner/argv"
+	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/api/types/filters"
+	"github.com/docker/docker/pkg/stdcopy"
+)
+
+func (s *script) exec(containerRef string, command string) ([]byte, []byte, error) {
+	args, _ := argv.Argv(command, nil, nil)
+	execID, err := s.cli.ContainerExecCreate(context.Background(), containerRef, types.ExecConfig{
+		Cmd:          args[0],
+		AttachStdin:  true,
+		AttachStderr: true,
+	})
+	if err != nil {
+		return nil, nil, fmt.Errorf("exec: error creating container exec: %w", err)
+	}
+
+	resp, err := s.cli.ContainerExecAttach(context.Background(), execID.ID, types.ExecStartCheck{})
+	if err != nil {
+		return nil, nil, fmt.Errorf("exec: error attaching container exec: %w", err)
+	}
+	defer resp.Close()
+
+	var outBuf, errBuf bytes.Buffer
+	outputDone := make(chan error)
+
+	go func() {
+		_, err := stdcopy.StdCopy(&outBuf, &errBuf, resp.Reader)
+		outputDone <- err
+	}()
+
+	select {
+	case err := <-outputDone:
+		if err != nil {
+			return nil, nil, fmt.Errorf("exec: error demultiplexing output: %w", err)
+		}
+		break
+	}
+
+	stdout, err := ioutil.ReadAll(&outBuf)
+	if err != nil {
+		return nil, nil, fmt.Errorf("exec: error reading stdout: %w", err)
+	}
+	stderr, err := ioutil.ReadAll(&errBuf)
+	if err != nil {
+		return nil, nil, fmt.Errorf("exec: error reading stderr: %w", err)
+	}
+
+	res, err := s.cli.ContainerExecInspect(context.Background(), execID.ID)
+	if err != nil {
+		return nil, nil, fmt.Errorf("exec: error inspecting container exec: %w", err)
+	}
+
+	if res.ExitCode > 0 {
+		return stdout, stderr, fmt.Errorf("exec: running command exited %d", res.ExitCode)
+	}
+
+	return stdout, stderr, nil
+}
+
+func (s *script) runLabeledCommands(label string) error {
+	f := []filters.KeyValuePair{
+		{Key: "label", Value: label},
+	}
+	if s.c.ExecLabel != "" {
+		f = append(f, filters.KeyValuePair{
+			Key:   "label",
+			Value: fmt.Sprintf("docker-volume-backup.exec-label=%s", s.c.ExecLabel),
+		})
+	}
+	containersWithCommand, err := s.cli.ContainerList(context.Background(), types.ContainerListOptions{
+		Quiet:   true,
+		Filters: filters.NewArgs(f...),
+	})
+	if err != nil {
+		return fmt.Errorf("runLabeledCommands: error querying for containers", err)
+	}
+
+	if len(containersWithCommand) == 0 {
+		return nil
+	}
+
+	wg := sync.WaitGroup{}
+	wg.Add(len(containersWithCommand))
+
+	var cmdErrors []error
+	for _, container := range containersWithCommand {
+		go func(c types.Container) {
+			cmd, _ := c.Labels[label]
+			s.logger.Infof("Running %s command %s for container %s", label, cmd, strings.TrimPrefix(c.Names[0], "/"))
+			stdout, stderr, err := s.exec(c.ID, cmd)
+			if err != nil {
+				cmdErrors = append(cmdErrors, err)
+			}
+			if s.c.ExecForwardOutput {
+				os.Stderr.Write(stderr)
+				os.Stdout.Write(stdout)
+			}
+			wg.Done()
+		}(container)
+	}
+
+	wg.Wait()
+	if len(cmdErrors) != 0 {
+		return join(cmdErrors...)
+	}
+	return nil
+}
--- a/cmd/backup/hooks.go
+++ b/cmd/backup/hooks.go
@@ -0,0 +1,56 @@
+// Copyright 2022 - Offen Authors <hioffen@posteo.de>
+// SPDX-License-Identifier: MPL-2.0
+
+package main
+
+import (
+	"fmt"
+	"sort"
+)
+
+// hook contains a queued action that can be trigger them when the script
+// reaches a certain point (e.g. unsuccessful backup)
+type hook struct {
+	level  hookLevel
+	action func(err error) error
+}
+
+type hookLevel int
+
+const (
+	hookLevelPlumbing hookLevel = iota
+	hookLevelError
+	hookLevelInfo
+)
+
+var hookLevels = map[string]hookLevel{
+	"info":  hookLevelInfo,
+	"error": hookLevelError,
+}
+
+// registerHook adds the given action at the given level.
+func (s *script) registerHook(level hookLevel, action func(err error) error) {
+	s.hooks = append(s.hooks, hook{level, action})
+}
+
+// runHooks runs all hooks that have been registered using the
+// given levels in the defined ordering. In case executing a hook returns an
+// error, the following hooks will still be run before the function returns.
+func (s *script) runHooks(err error) error {
+	sort.SliceStable(s.hooks, func(i, j int) bool {
+		return s.hooks[i].level < s.hooks[j].level
+	})
+	var actionErrors []error
+	for _, hook := range s.hooks {
+		if hook.level > s.hookLevel {
+			continue
+		}
+		if actionErr := hook.action(err); actionErr != nil {
+			actionErrors = append(actionErrors, fmt.Errorf("runHooks: error running hook: %w", actionErr))
+		}
+	}
+	if len(actionErrors) != 0 {
+		return join(actionErrors...)
+	}
+	return nil
+}
--- a/cmd/backup/main.go
+++ b/cmd/backup/main.go
@@ -0,0 +1,64 @@
+// Copyright 2021-2022 - Offen Authors <hioffen@posteo.de>
+// SPDX-License-Identifier: MPL-2.0
+
+package main
+
+import (
+	"os"
+)
+
+func main() {
+	unlock := lock("/var/lock/dockervolumebackup.lock")
+	defer unlock()
+
+	s, err := newScript()
+	if err != nil {
+		panic(err)
+	}
+
+	defer func() {
+		if pArg := recover(); pArg != nil {
+			if err, ok := pArg.(error); ok {
+				if hookErr := s.runHooks(err); hookErr != nil {
+					s.logger.Errorf("An error occurred calling the registered hooks: %s", hookErr)
+				}
+				os.Exit(1)
+			}
+			panic(pArg)
+		}
+
+		if err := s.runHooks(nil); err != nil {
+			s.logger.Errorf(
+				"Backup procedure ran successfully, but an error ocurred calling the registered hooks: %v",
+				err,
+			)
+			os.Exit(1)
+		}
+		s.logger.Info("Finished running backup tasks.")
+	}()
+
+	s.must(func() error {
+		runPostCommands, err := s.runCommands()
+		defer func() {
+			s.must(runPostCommands())
+		}()
+		if err != nil {
+			return err
+		}
+		restartContainers, err := s.stopContainers()
+		// The mechanism for restarting containers is not using hooks as it
+		// should happen as soon as possible (i.e. before uploading backups or
+		// similar).
+		defer func() {
+			s.must(restartContainers())
+		}()
+		if err != nil {
+			return err
+		}
+		return s.takeBackup()
+	}())
+
+	s.must(s.encryptBackup())
+	s.must(s.copyBackup())
+	s.must(s.pruneBackups())
+}
--- a/cmd/backup/notifications.go
+++ b/cmd/backup/notifications.go
@@ -0,0 +1,105 @@
+// Copyright 2022 - Offen Authors <hioffen@posteo.de>
+// SPDX-License-Identifier: MPL-2.0
+
+package main
+
+import (
+	"bytes"
+	_ "embed"
+	"fmt"
+	"text/template"
+	"time"
+
+	sTypes "github.com/containrrr/shoutrrr/pkg/types"
+)
+
+//go:embed notifications.tmpl
+var defaultNotifications string
+
+// NotificationData data to be passed to the notification templates
+type NotificationData struct {
+	Error  error
+	Config *Config
+	Stats  *Stats
+}
+
+// notify sends a notification using the given title and body templates.
+// Automatically creates notification data, adding the given error
+func (s *script) notify(titleTemplate string, bodyTemplate string, err error) error {
+	params := NotificationData{
+		Error:  err,
+		Stats:  s.stats,
+		Config: s.c,
+	}
+
+	titleBuf := &bytes.Buffer{}
+	if err := s.template.ExecuteTemplate(titleBuf, titleTemplate, params); err != nil {
+		return fmt.Errorf("notifyFailure: error executing %s template: %w", titleTemplate, err)
+	}
+
+	bodyBuf := &bytes.Buffer{}
+	if err := s.template.ExecuteTemplate(bodyBuf, bodyTemplate, params); err != nil {
+		return fmt.Errorf("notifyFailure: error executing %s template: %w", bodyTemplate, err)
+	}
+
+	if err := s.sendNotification(titleBuf.String(), bodyBuf.String()); err != nil {
+		return fmt.Errorf("notifyFailure: error notifying: %w", err)
+	}
+	return nil
+}
+
+// notifyFailure sends a notification about a failed backup run
+func (s *script) notifyFailure(err error) error {
+	return s.notify("title_failure", "body_failure", err)
+}
+
+// notifyFailure sends a notification about a successful backup run
+func (s *script) notifySuccess() error {
+	return s.notify("title_success", "body_success", nil)
+}
+
+// sendNotification sends a notification to all configured third party services
+func (s *script) sendNotification(title, body string) error {
+	var errs []error
+	for _, result := range s.sender.Send(body, &sTypes.Params{"title": title}) {
+		if result != nil {
+			errs = append(errs, result)
+		}
+	}
+	if len(errs) != 0 {
+		return fmt.Errorf("sendNotification: error sending message: %w", join(errs...))
+	}
+	return nil
+}
+
+var templateHelpers = template.FuncMap{
+	"formatTime": func(t time.Time) string {
+		return t.Format(time.RFC3339)
+	},
+	"formatBytesDec": func(bytes uint64) string {
+		return formatBytes(bytes, true)
+	},
+	"formatBytesBin": func(bytes uint64) string {
+		return formatBytes(bytes, false)
+	},
+}
+
+// formatBytes converts an amount of bytes in a human-readable representation
+// the decimal parameter specifies if using powers of 1000 (decimal) or powers of 1024 (binary)
+func formatBytes(b uint64, decimal bool) string {
+	unit := uint64(1024)
+	format := "%.1f %ciB"
+	if decimal {
+		unit = uint64(1000)
+		format = "%.1f %cB"
+	}
+	if b < unit {
+		return fmt.Sprintf("%d B", b)
+	}
+	div, exp := unit, 0
+	for n := b / unit; n >= unit; n /= unit {
+		div *= unit
+		exp++
+	}
+	return fmt.Sprintf(format, float64(b)/float64(div), "kMGTPE"[exp])
+}
--- a/cmd/backup/notifications.tmpl
+++ b/cmd/backup/notifications.tmpl
@@ -0,0 +1,26 @@
+{{ define "title_failure" -}}
+Failure running docker-volume-backup at {{ .Stats.StartTime | formatTime }}
+{{- end }}
+
+
+{{ define "body_failure" -}}
+Running docker-volume-backup failed with error: {{ .Error }}
+
+Log output of the failed run was:
+
+{{ .Stats.LogOutput }}
+{{- end }}
+
+
+{{ define "title_success" -}}
+Success running docker-volume-backup at {{ .Stats.StartTime | formatTime }}
+{{- end }}
+
+
+{{ define "body_success" -}}
+Running docker-volume-backup succeeded.
+
+Log output was:
+
+{{ .Stats.LogOutput }}
+{{- end }}
--- a/cmd/backup/script.go
+++ b/cmd/backup/script.go
@@ -0,0 +1,681 @@
+// Copyright 2022 - Offen Authors <hioffen@posteo.de>
+// SPDX-License-Identifier: MPL-2.0
+
+package main
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"io/fs"
+	"os"
+	"path"
+	"path/filepath"
+	"text/template"
+	"time"
+
+	"github.com/containrrr/shoutrrr"
+	"github.com/containrrr/shoutrrr/pkg/router"
+	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/api/types/filters"
+	"github.com/docker/docker/api/types/swarm"
+	"github.com/docker/docker/client"
+	"github.com/kelseyhightower/envconfig"
+	"github.com/leekchan/timeutil"
+	"github.com/minio/minio-go/v7"
+	"github.com/minio/minio-go/v7/pkg/credentials"
+	"github.com/otiai10/copy"
+	"github.com/sirupsen/logrus"
+	"github.com/studio-b12/gowebdav"
+	"golang.org/x/crypto/openpgp"
+)
+
+// script holds all the stateful information required to orchestrate a
+// single backup run.
+type script struct {
+	cli          *client.Client
+	minioClient  *minio.Client
+	webdavClient *gowebdav.Client
+	logger       *logrus.Logger
+	sender       *router.ServiceRouter
+	template     *template.Template
+	hooks        []hook
+	hookLevel    hookLevel
+
+	file  string
+	stats *Stats
+
+	c *Config
+}
+
+// newScript creates all resources needed for the script to perform actions against
+// remote resources like the Docker engine or remote storage locations. All
+// reading from env vars or other configuration sources is expected to happen
+// in this method.
+func newScript() (*script, error) {
+	stdOut, logBuffer := buffer(os.Stdout)
+	s := &script{
+		c: &Config{},
+		logger: &logrus.Logger{
+			Out:       stdOut,
+			Formatter: new(logrus.TextFormatter),
+			Hooks:     make(logrus.LevelHooks),
+			Level:     logrus.InfoLevel,
+		},
+		stats: &Stats{
+			StartTime: time.Now(),
+			LogOutput: logBuffer,
+			Storages:  StoragesStats{},
+		},
+	}
+
+	s.registerHook(hookLevelPlumbing, func(error) error {
+		s.stats.EndTime = time.Now()
+		s.stats.TookTime = s.stats.EndTime.Sub(s.stats.StartTime)
+		return nil
+	})
+
+	if err := envconfig.Process("", s.c); err != nil {
+		return nil, fmt.Errorf("newScript: failed to process configuration values: %w", err)
+	}
+
+	s.file = path.Join("/tmp", s.c.BackupFilename)
+	if s.c.BackupFilenameExpand {
+		s.file = os.ExpandEnv(s.file)
+		s.c.BackupLatestSymlink = os.ExpandEnv(s.c.BackupLatestSymlink)
+		s.c.BackupPruningPrefix = os.ExpandEnv(s.c.BackupPruningPrefix)
+	}
+	s.file = timeutil.Strftime(&s.stats.StartTime, s.file)
+
+	_, err := os.Stat("/var/run/docker.sock")
+	_, dockerHostSet := os.LookupEnv("DOCKER_HOST")
+	if !os.IsNotExist(err) || dockerHostSet {
+		cli, err := client.NewClientWithOpts(client.FromEnv, client.WithAPIVersionNegotiation())
+		if err != nil {
+			return nil, fmt.Errorf("newScript: failed to create docker client")
+		}
+		s.cli = cli
+	}
+
+	if s.c.AwsS3BucketName != "" {
+		var creds *credentials.Credentials
+		if s.c.AwsAccessKeyID != "" && s.c.AwsSecretAccessKey != "" {
+			creds = credentials.NewStaticV4(
+				s.c.AwsAccessKeyID,
+				s.c.AwsSecretAccessKey,
+				"",
+			)
+		} else if s.c.AwsIamRoleEndpoint != "" {
+			creds = credentials.NewIAM(s.c.AwsIamRoleEndpoint)
+		} else {
+			return nil, errors.New("newScript: AWS_S3_BUCKET_NAME is defined, but no credentials were provided")
+		}
+
+		options := minio.Options{
+			Creds:  creds,
+			Secure: s.c.AwsEndpointProto == "https",
+		}
+
+		if s.c.AwsEndpointInsecure {
+			if !options.Secure {
+				return nil, errors.New("newScript: AWS_ENDPOINT_INSECURE = true is only meaningful for https")
+			}
+
+			transport, err := minio.DefaultTransport(true)
+			if err != nil {
+				return nil, fmt.Errorf("newScript: failed to create default minio transport")
+			}
+			transport.TLSClientConfig.InsecureSkipVerify = true
+			options.Transport = transport
+		}
+
+		mc, err := minio.New(s.c.AwsEndpoint, &options)
+		if err != nil {
+			return nil, fmt.Errorf("newScript: error setting up minio client: %w", err)
+		}
+		s.minioClient = mc
+	}
+
+	if s.c.WebdavUrl != "" {
+		if s.c.WebdavUsername == "" || s.c.WebdavPassword == "" {
+			return nil, errors.New("newScript: WEBDAV_URL is defined, but no credentials were provided")
+		} else {
+			webdavClient := gowebdav.NewClient(s.c.WebdavUrl, s.c.WebdavUsername, s.c.WebdavPassword)
+			s.webdavClient = webdavClient
+		}
+	}
+
+	if s.c.EmailNotificationRecipient != "" {
+		emailURL := fmt.Sprintf(
+			"smtp://%s:%s@%s:%d/?from=%s&to=%s",
+			s.c.EmailSMTPUsername,
+			s.c.EmailSMTPPassword,
+			s.c.EmailSMTPHost,
+			s.c.EmailSMTPPort,
+			s.c.EmailNotificationSender,
+			s.c.EmailNotificationRecipient,
+		)
+		s.c.NotificationURLs = append(s.c.NotificationURLs, emailURL)
+		s.logger.Warn(
+			"Using EMAIL_* keys for providing notification configuration has been deprecated and will be removed in the next major version.",
+		)
+		s.logger.Warn(
+			"Please use NOTIFICATION_URLS instead. Refer to the README for an upgrade guide.",
+		)
+	}
+
+	hookLevel, ok := hookLevels[s.c.NotificationLevel]
+	if !ok {
+		return nil, fmt.Errorf("newScript: unknown NOTIFICATION_LEVEL %s", s.c.NotificationLevel)
+	}
+	s.hookLevel = hookLevel
+
+	if len(s.c.NotificationURLs) > 0 {
+		sender, senderErr := shoutrrr.CreateSender(s.c.NotificationURLs...)
+		if senderErr != nil {
+			return nil, fmt.Errorf("newScript: error creating sender: %w", senderErr)
+		}
+		s.sender = sender
+
+		tmpl := template.New("")
+		tmpl.Funcs(templateHelpers)
+		tmpl, err = tmpl.Parse(defaultNotifications)
+		if err != nil {
+			return nil, fmt.Errorf("newScript: unable to parse default notifications templates: %w", err)
+		}
+
+		if fi, err := os.Stat("/etc/dockervolumebackup/notifications.d"); err == nil && fi.IsDir() {
+			tmpl, err = tmpl.ParseGlob("/etc/dockervolumebackup/notifications.d/*.*")
+			if err != nil {
+				return nil, fmt.Errorf("newScript: unable to parse user defined notifications templates: %w", err)
+			}
+		}
+		s.template = tmpl
+
+		// To prevent duplicate notifications, ensure the regsistered callbacks
+		// run mutually exclusive.
+		s.registerHook(hookLevelError, func(err error) error {
+			if err == nil {
+				return nil
+			}
+			return s.notifyFailure(err)
+		})
+		s.registerHook(hookLevelInfo, func(err error) error {
+			if err != nil {
+				return nil
+			}
+			return s.notifySuccess()
+		})
+	}
+
+	return s, nil
+}
+
+func (s *script) runCommands() (func() error, error) {
+	if s.cli == nil {
+		return noop, nil
+	}
+
+	if err := s.runLabeledCommands("docker-volume-backup.exec-pre"); err != nil {
+		return noop, fmt.Errorf("runCommands: error running pre commands: %w", err)
+	}
+	return func() error {
+		if err := s.runLabeledCommands("docker-volume-backup.exec-post"); err != nil {
+			return fmt.Errorf("runCommands: error running post commands: %w", err)
+		}
+		return nil
+	}, nil
+}
+
+// stopContainers stops all Docker containers that are marked as to being
+// stopped during the backup and returns a function that can be called to
+// restart everything that has been stopped.
+func (s *script) stopContainers() (func() error, error) {
+	if s.cli == nil {
+		return noop, nil
+	}
+
+	allContainers, err := s.cli.ContainerList(context.Background(), types.ContainerListOptions{
+		Quiet: true,
+	})
+	if err != nil {
+		return noop, fmt.Errorf("stopContainersAndRun: error querying for containers: %w", err)
+	}
+
+	containerLabel := fmt.Sprintf(
+		"docker-volume-backup.stop-during-backup=%s",
+		s.c.BackupStopContainerLabel,
+	)
+	containersToStop, err := s.cli.ContainerList(context.Background(), types.ContainerListOptions{
+		Quiet: true,
+		Filters: filters.NewArgs(filters.KeyValuePair{
+			Key:   "label",
+			Value: containerLabel,
+		}),
+	})
+
+	if err != nil {
+		return noop, fmt.Errorf("stopContainersAndRun: error querying for containers to stop: %w", err)
+	}
+
+	if len(containersToStop) == 0 {
+		return noop, nil
+	}
+
+	s.logger.Infof(
+		"Stopping %d container(s) labeled `%s` out of %d running container(s).",
+		len(containersToStop),
+		containerLabel,
+		len(allContainers),
+	)
+
+	var stoppedContainers []types.Container
+	var stopErrors []error
+	for _, container := range containersToStop {
+		if err := s.cli.ContainerStop(context.Background(), container.ID, nil); err != nil {
+			stopErrors = append(stopErrors, err)
+		} else {
+			stoppedContainers = append(stoppedContainers, container)
+		}
+	}
+
+	var stopError error
+	if len(stopErrors) != 0 {
+		stopError = fmt.Errorf(
+			"stopContainersAndRun: %d error(s) stopping containers: %w",
+			len(stopErrors),
+			join(stopErrors...),
+		)
+	}
+
+	s.stats.Containers = ContainersStats{
+		All:     uint(len(allContainers)),
+		ToStop:  uint(len(containersToStop)),
+		Stopped: uint(len(stoppedContainers)),
+	}
+
+	return func() error {
+		servicesRequiringUpdate := map[string]struct{}{}
+
+		var restartErrors []error
+		for _, container := range stoppedContainers {
+			if swarmServiceName, ok := container.Labels["com.docker.swarm.service.name"]; ok {
+				servicesRequiringUpdate[swarmServiceName] = struct{}{}
+				continue
+			}
+			if err := s.cli.ContainerStart(context.Background(), container.ID, types.ContainerStartOptions{}); err != nil {
+				restartErrors = append(restartErrors, err)
+			}
+		}
+
+		if len(servicesRequiringUpdate) != 0 {
+			services, _ := s.cli.ServiceList(context.Background(), types.ServiceListOptions{})
+			for serviceName := range servicesRequiringUpdate {
+				var serviceMatch swarm.Service
+				for _, service := range services {
+					if service.Spec.Name == serviceName {
+						serviceMatch = service
+						break
+					}
+				}
+				if serviceMatch.ID == "" {
+					return fmt.Errorf("stopContainersAndRun: couldn't find service with name %s", serviceName)
+				}
+				serviceMatch.Spec.TaskTemplate.ForceUpdate = 1
+				if _, err := s.cli.ServiceUpdate(
+					context.Background(), serviceMatch.ID,
+					serviceMatch.Version, serviceMatch.Spec, types.ServiceUpdateOptions{},
+				); err != nil {
+					restartErrors = append(restartErrors, err)
+				}
+			}
+		}
+
+		if len(restartErrors) != 0 {
+			return fmt.Errorf(
+				"stopContainersAndRun: %d error(s) restarting containers and services: %w",
+				len(restartErrors),
+				join(restartErrors...),
+			)
+		}
+		s.logger.Infof(
+			"Restarted %d container(s) and the matching service(s).",
+			len(stoppedContainers),
+		)
+		return nil
+	}, stopError
+}
+
+// takeBackup creates a tar archive of the configured backup location and
+// saves it to disk.
+func (s *script) takeBackup() error {
+	backupSources := s.c.BackupSources
+
+	if s.c.BackupFromSnapshot {
+		backupSources = filepath.Join("/tmp", s.c.BackupSources)
+		// copy before compressing guard against a situation where backup folder's content are still growing.
+		s.registerHook(hookLevelPlumbing, func(error) error {
+			if err := remove(backupSources); err != nil {
+				return fmt.Errorf("takeBackup: error removing snapshot: %w", err)
+			}
+			s.logger.Infof("Removed snapshot `%s`.", backupSources)
+			return nil
+		})
+		if err := copy.Copy(s.c.BackupSources, backupSources, copy.Options{
+			PreserveTimes: true,
+			PreserveOwner: true,
+		}); err != nil {
+			return fmt.Errorf("takeBackup: error creating snapshot: %w", err)
+		}
+		s.logger.Infof("Created snapshot of `%s` at `%s`.", s.c.BackupSources, backupSources)
+	}
+
+	tarFile := s.file
+	s.registerHook(hookLevelPlumbing, func(error) error {
+		if err := remove(tarFile); err != nil {
+			return fmt.Errorf("takeBackup: error removing tar file: %w", err)
+		}
+		s.logger.Infof("Removed tar file `%s`.", tarFile)
+		return nil
+	})
+	if err := createArchive(backupSources, tarFile); err != nil {
+		return fmt.Errorf("takeBackup: error compressing backup folder: %w", err)
+	}
+
+	s.logger.Infof("Created backup of `%s` at `%s`.", backupSources, tarFile)
+	return nil
+}
+
+// encryptBackup encrypts the backup file using PGP and the configured passphrase.
+// In case no passphrase is given it returns early, leaving the backup file
+// untouched.
+func (s *script) encryptBackup() error {
+	if s.c.GpgPassphrase == "" {
+		return nil
+	}
+
+	gpgFile := fmt.Sprintf("%s.gpg", s.file)
+	s.registerHook(hookLevelPlumbing, func(error) error {
+		if err := remove(gpgFile); err != nil {
+			return fmt.Errorf("encryptBackup: error removing gpg file: %w", err)
+		}
+		s.logger.Infof("Removed GPG file `%s`.", gpgFile)
+		return nil
+	})
+
+	outFile, err := os.Create(gpgFile)
+	defer outFile.Close()
+	if err != nil {
+		return fmt.Errorf("encryptBackup: error opening out file: %w", err)
+	}
+
+	_, name := path.Split(s.file)
+	dst, err := openpgp.SymmetricallyEncrypt(outFile, []byte(s.c.GpgPassphrase), &openpgp.FileHints{
+		IsBinary: true,
+		FileName: name,
+	}, nil)
+	defer dst.Close()
+	if err != nil {
+		return fmt.Errorf("encryptBackup: error encrypting backup file: %w", err)
+	}
+
+	src, err := os.Open(s.file)
+	if err != nil {
+		return fmt.Errorf("encryptBackup: error opening backup file `%s`: %w", s.file, err)
+	}
+
+	if _, err := io.Copy(dst, src); err != nil {
+		return fmt.Errorf("encryptBackup: error writing ciphertext to file: %w", err)
+	}
+
+	s.file = gpgFile
+	s.logger.Infof("Encrypted backup using given passphrase, saving as `%s`.", s.file)
+	return nil
+}
+
+// copyBackup makes sure the backup file is copied to both local and remote locations
+// as per the given configuration.
+func (s *script) copyBackup() error {
+	_, name := path.Split(s.file)
+	if stat, err := os.Stat(s.file); err != nil {
+		return fmt.Errorf("copyBackup: unable to stat backup file: %w", err)
+	} else {
+		size := stat.Size()
+		s.stats.BackupFile = BackupFileStats{
+			Size:     uint64(size),
+			Name:     name,
+			FullPath: s.file,
+		}
+	}
+
+	if s.minioClient != nil {
+		if _, err := s.minioClient.FPutObject(context.Background(), s.c.AwsS3BucketName, filepath.Join(s.c.AwsS3Path, name), s.file, minio.PutObjectOptions{
+			ContentType: "application/tar+gzip",
+		}); err != nil {
+			return fmt.Errorf("copyBackup: error uploading backup to remote storage: %w", err)
+		}
+		s.logger.Infof("Uploaded a copy of backup `%s` to bucket `%s`.", s.file, s.c.AwsS3BucketName)
+	}
+
+	if s.webdavClient != nil {
+		bytes, err := os.ReadFile(s.file)
+		if err != nil {
+			return fmt.Errorf("copyBackup: error reading the file to be uploaded: %w", err)
+		}
+		if err := s.webdavClient.MkdirAll(s.c.WebdavPath, 0644); err != nil {
+			return fmt.Errorf("copyBackup: error creating directory '%s' on WebDAV server: %w", s.c.WebdavPath, err)
+		}
+		if err := s.webdavClient.Write(filepath.Join(s.c.WebdavPath, name), bytes, 0644); err != nil {
+			return fmt.Errorf("copyBackup: error uploading the file to WebDAV server: %w", err)
+		}
+		s.logger.Infof("Uploaded a copy of backup `%s` to WebDAV-URL '%s' at path '%s'.", s.file, s.c.WebdavUrl, s.c.WebdavPath)
+	}
+
+	if _, err := os.Stat(s.c.BackupArchive); !os.IsNotExist(err) {
+		if err := copyFile(s.file, path.Join(s.c.BackupArchive, name)); err != nil {
+			return fmt.Errorf("copyBackup: error copying file to local archive: %w", err)
+		}
+		s.logger.Infof("Stored copy of backup `%s` in local archive `%s`.", s.file, s.c.BackupArchive)
+		if s.c.BackupLatestSymlink != "" {
+			symlink := path.Join(s.c.BackupArchive, s.c.BackupLatestSymlink)
+			if _, err := os.Lstat(symlink); err == nil {
+				os.Remove(symlink)
+			}
+			if err := os.Symlink(name, symlink); err != nil {
+				return fmt.Errorf("copyBackup: error creating latest symlink: %w", err)
+			}
+			s.logger.Infof("Created/Updated symlink `%s` for latest backup.", s.c.BackupLatestSymlink)
+		}
+	}
+	return nil
+}
+
+// pruneBackups rotates away backups from local and remote storages using
+// the given configuration. In case the given configuration would delete all
+// backups, it does nothing instead and logs a warning.
+func (s *script) pruneBackups() error {
+	if s.c.BackupRetentionDays < 0 {
+		return nil
+	}
+
+	deadline := time.Now().AddDate(0, 0, -int(s.c.BackupRetentionDays)).Add(s.c.BackupPruningLeeway)
+
+	// doPrune holds general control flow that applies to any kind of storage.
+	// Callers can pass in a thunk that performs the actual deletion of files.
+	var doPrune = func(lenMatches, lenCandidates int, description string, doRemoveFiles func() error) error {
+		if lenMatches != 0 && lenMatches != lenCandidates {
+			if err := doRemoveFiles(); err != nil {
+				return err
+			}
+			s.logger.Infof(
+				"Pruned %d out of %d %s as their age exceeded the configured retention period of %d days.",
+				lenMatches,
+				lenCandidates,
+				description,
+				s.c.BackupRetentionDays,
+			)
+		} else if lenMatches != 0 && lenMatches == lenCandidates {
+			s.logger.Warnf("The current configuration would delete all %d existing %s.", lenMatches, description)
+			s.logger.Warn("Refusing to do so, please check your configuration.")
+		} else {
+			s.logger.Infof("None of %d existing %s were pruned.", lenCandidates, description)
+		}
+		return nil
+	}
+
+	if s.minioClient != nil {
+		candidates := s.minioClient.ListObjects(context.Background(), s.c.AwsS3BucketName, minio.ListObjectsOptions{
+			WithMetadata: true,
+			Prefix:       s.c.BackupPruningPrefix,
+		})
+
+		var matches []minio.ObjectInfo
+		var lenCandidates int
+		for candidate := range candidates {
+			lenCandidates++
+			if candidate.Err != nil {
+				return fmt.Errorf(
+					"pruneBackups: error looking up candidates from remote storage: %w",
+					candidate.Err,
+				)
+			}
+			if candidate.LastModified.Before(deadline) {
+				matches = append(matches, candidate)
+			}
+		}
+
+		s.stats.Storages.S3 = StorageStats{
+			Total:  uint(lenCandidates),
+			Pruned: uint(len(matches)),
+		}
+
+		doPrune(len(matches), lenCandidates, "remote backup(s)", func() error {
+			objectsCh := make(chan minio.ObjectInfo)
+			go func() {
+				for _, match := range matches {
+					objectsCh <- match
+				}
+				close(objectsCh)
+			}()
+			errChan := s.minioClient.RemoveObjects(context.Background(), s.c.AwsS3BucketName, objectsCh, minio.RemoveObjectsOptions{})
+			var removeErrors []error
+			for result := range errChan {
+				if result.Err != nil {
+					removeErrors = append(removeErrors, result.Err)
+				}
+			}
+			if len(removeErrors) != 0 {
+				return join(removeErrors...)
+			}
+			return nil
+		})
+	}
+
+	if s.webdavClient != nil {
+		candidates, err := s.webdavClient.ReadDir(s.c.WebdavPath)
+		if err != nil {
+			return fmt.Errorf("pruneBackups: error looking up candidates from remote storage: %w", err)
+		}
+		var matches []fs.FileInfo
+		var lenCandidates int
+		for _, candidate := range candidates {
+			lenCandidates++
+			if candidate.ModTime().Before(deadline) {
+				matches = append(matches, candidate)
+			}
+		}
+
+		s.stats.Storages.WebDAV = StorageStats{
+			Total:  uint(lenCandidates),
+			Pruned: uint(len(matches)),
+		}
+
+		doPrune(len(matches), lenCandidates, "WebDAV backup(s)", func() error {
+			for _, match := range matches {
+				if err := s.webdavClient.Remove(filepath.Join(s.c.WebdavPath, match.Name())); err != nil {
+					return fmt.Errorf("pruneBackups: error removing file from WebDAV storage: %w", err)
+				}
+			}
+			return nil
+		})
+	}
+
+	if _, err := os.Stat(s.c.BackupArchive); !os.IsNotExist(err) {
+		globPattern := path.Join(
+			s.c.BackupArchive,
+			fmt.Sprintf("%s*", s.c.BackupPruningPrefix),
+		)
+		globMatches, err := filepath.Glob(globPattern)
+		if err != nil {
+			return fmt.Errorf(
+				"pruneBackups: error looking up matching files using pattern %s: %w",
+				globPattern,
+				err,
+			)
+		}
+
+		var candidates []string
+		for _, candidate := range globMatches {
+			fi, err := os.Lstat(candidate)
+			if err != nil {
+				return fmt.Errorf(
+					"pruneBackups: error calling Lstat on file %s: %w",
+					candidate,
+					err,
+				)
+			}
+
+			if fi.Mode()&os.ModeSymlink != os.ModeSymlink {
+				candidates = append(candidates, candidate)
+			}
+		}
+
+		var matches []string
+		for _, candidate := range candidates {
+			fi, err := os.Stat(candidate)
+			if err != nil {
+				return fmt.Errorf(
+					"pruneBackups: error calling stat on file %s: %w",
+					candidate,
+					err,
+				)
+			}
+			if fi.ModTime().Before(deadline) {
+				matches = append(matches, candidate)
+			}
+		}
+
+		s.stats.Storages.Local = StorageStats{
+			Total:  uint(len(candidates)),
+			Pruned: uint(len(matches)),
+		}
+
+		doPrune(len(matches), len(candidates), "local backup(s)", func() error {
+			var removeErrors []error
+			for _, match := range matches {
+				if err := os.Remove(match); err != nil {
+					removeErrors = append(removeErrors, err)
+				}
+			}
+			if len(removeErrors) != 0 {
+				return fmt.Errorf(
+					"pruneBackups: %d error(s) deleting local files, starting with: %w",
+					len(removeErrors),
+					join(removeErrors...),
+				)
+			}
+			return nil
+		})
+	}
+	return nil
+}
+
+// must exits the script run prematurely in case the given error
+// is non-nil.
+func (s *script) must(err error) {
+	if err != nil {
+		s.logger.Errorf("Fatal error running backup: %s", err)
+		panic(err)
+	}
+}
--- a/cmd/backup/stats.go
+++ b/cmd/backup/stats.go
@@ -0,0 +1,49 @@
+// Copyright 2022 - Offen Authors <hioffen@posteo.de>
+// SPDX-License-Identifier: MPL-2.0
+
+package main
+
+import (
+	"bytes"
+	"time"
+)
+
+// ContainersStats stats about the docker containers
+type ContainersStats struct {
+	All        uint
+	ToStop     uint
+	Stopped    uint
+	StopErrors uint
+}
+
+// BackupFileStats stats about the created backup file
+type BackupFileStats struct {
+	Name     string
+	FullPath string
+	Size     uint64
+}
+
+// StorageStats stats about the status of an archival directory
+type StorageStats struct {
+	Total       uint
+	Pruned      uint
+	PruneErrors uint
+}
+
+// StoragesStats stats about each possible archival location (Local, WebDAV, S3)
+type StoragesStats struct {
+	Local  StorageStats
+	WebDAV StorageStats
+	S3     StorageStats
+}
+
+// Stats global stats regarding script execution
+type Stats struct {
+	StartTime  time.Time
+	EndTime    time.Time
+	TookTime   time.Duration
+	LogOutput  *bytes.Buffer
+	Containers ContainersStats
+	BackupFile BackupFileStats
+	Storages   StoragesStats
+}
--- a/cmd/backup/util.go
+++ b/cmd/backup/util.go
@@ -0,0 +1,107 @@
+// Copyright 2022 - Offen Authors <hioffen@posteo.de>
+// SPDX-License-Identifier: MPL-2.0
+
+package main
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+
+	"github.com/gofrs/flock"
+)
+
+var noop = func() error { return nil }
+
+// lock opens a lockfile at the given location, keeping it locked until the
+// caller invokes the returned release func. When invoked while the file is
+// still locked the function panics.
+func lock(lockfile string) func() error {
+	fileLock := flock.New(lockfile)
+	acquired, err := fileLock.TryLock()
+	if err != nil {
+		panic(err)
+	}
+	if !acquired {
+		panic("unable to acquire file lock")
+	}
+	return fileLock.Unlock
+}
+
+// copy creates a copy of the file located at `dst` at `src`.
+func copyFile(src, dst string) error {
+	in, err := os.Open(src)
+	if err != nil {
+		return err
+	}
+	defer in.Close()
+
+	out, err := os.Create(dst)
+	if err != nil {
+		return err
+	}
+
+	_, err = io.Copy(out, in)
+	if err != nil {
+		out.Close()
+		return err
+	}
+	return out.Close()
+}
+
+// join takes a list of errors and joins them into a single error
+func join(errs ...error) error {
+	if len(errs) == 1 {
+		return errs[0]
+	}
+	var msgs []string
+	for _, err := range errs {
+		if err == nil {
+			continue
+		}
+		msgs = append(msgs, err.Error())
+	}
+	return errors.New("[" + strings.Join(msgs, ", ") + "]")
+}
+
+// remove removes the given file or directory from disk.
+func remove(location string) error {
+	fi, err := os.Lstat(location)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil
+		}
+		return fmt.Errorf("remove: error checking for existence of `%s`: %w", location, err)
+	}
+	if fi.IsDir() {
+		err = os.RemoveAll(location)
+	} else {
+		err = os.Remove(location)
+	}
+	if err != nil {
+		return fmt.Errorf("remove: error removing `%s`: %w", location, err)
+	}
+	return nil
+}
+
+// buffer takes an io.Writer and returns a wrapped version of the
+// writer that writes to both the original target as well as the returned buffer
+func buffer(w io.Writer) (io.Writer, *bytes.Buffer) {
+	buffering := &bufferingWriter{buf: bytes.Buffer{}, writer: w}
+	return buffering, &buffering.buf
+}
+
+type bufferingWriter struct {
+	buf    bytes.Buffer
+	writer io.Writer
+}
+
+func (b *bufferingWriter) Write(p []byte) (n int, err error) {
+	if n, err := b.buf.Write(p); err != nil {
+		return n, fmt.Errorf("bufferingWriter: error writing to buffer: %w", err)
+	}
+	return b.writer.Write(p)
+}
--- a/docs/NOTIFICATION-TEMPLATES.md
+++ b/docs/NOTIFICATION-TEMPLATES.md
@@ -0,0 +1,38 @@
+# Notification templates reference
+
+In order to customize title and body of notifications you'll have to write a [go template](https://pkg.go.dev/text/template) and mount it inside the `/etc/dockervolumebackup/notifications.d/` directory.
+
+Configuration, data about the backup run and helper functions will be passed to this template, this page documents them fully.
+
+## Data
+Here is a list of all data passed to the template:
+
+* `Config`: this object holds the configuration that has been passed to the script. The field names are the name of the recognized environment variables converted in PascalCase. (e.g. `BACKUP_STOP_CONTAINER_LABEL` becomes `BackupStopContainerLabel`)
+* `Error`: the error that made the backup fail. Only available in the `title_failure` and `body_failure` templates
+* `Stats`: objects that holds stats regarding script execution. In case of an unsuccessful run, some information may not be available.
+  * `StartTime`: time when the script started execution
+  * `EndTime`: time when the backup has completed successfully (after pruning)
+  * `TookTime`: amount of time it took for the backup to run. (equal to `EndTime - StartTime`)
+  * `LogOutput`: full log of the application
+  * `Containers`: object containing stats about the docker containers
+    * `All`: total number of containers
+    * `ToStop`: number of containers matched by the stop rule
+    * `Stopped`: number of containers successfully stopped
+    * `StopErrors`: number of containers that were unable to be stopped (equal to `ToStop - Stopped`)
+  * `BackupFile`: object containing information about the backup file
+    * `Name`: name of the backup file (e.g. `backup-2022-02-11T01-00-00.tar.gz`)
+    * `FullPath`: full path of the backup file (e.g. `/archive/backup-2022-02-11T01-00-00.tar.gz`)
+    * `Size`: size in bytes of the backup file
+  * `Storages`: object that holds stats about each storage
+    * `Local`, `S3` or `WebDAV`:
+      * `Total`: total number of backup files
+      * `Pruned`: number of backup files that were deleted due to pruning rule
+      * `PruneErrors`: number of backup files that were unable to be pruned
+
+## Functions
+
+Some formatting functions are also available:
+
+* `formatTime`: formats a time object using [RFC3339](https://datatracker.ietf.org/doc/html/rfc3339) format (e.g. `2022-02-11T01:00:00Z`)
+* `formatBytesBin`: formats an amount of bytes using powers of 1024 (e.g. `7055258` bytes will be `6.7 MiB`) 
+* `formatBytesDec`: formats an amount of bytes using powers of 1000 (e.g. `7055258` bytes will be `7.1 MB`)
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -0,0 +1,14 @@
+#!/bin/sh
+
+# Copyright 2021 - Offen Authors <hioffen@posteo.de>
+# SPDX-License-Identifier: MPL-2.0
+
+set -e
+
+BACKUP_CRON_EXPRESSION="${BACKUP_CRON_EXPRESSION:-@daily}"
+
+echo "Installing cron.d entry with expression $BACKUP_CRON_EXPRESSION."
+echo "$BACKUP_CRON_EXPRESSION backup 2>&1" | crontab -
+
+echo "Starting cron in foreground."
+crond -f -l 8
--- a/go.mod
+++ b/go.mod
@@ -0,0 +1,59 @@
+module github.com/offen/docker-volume-backup
+
+go 1.17
+
+require (
+	github.com/containrrr/shoutrrr v0.5.2
+	github.com/docker/docker v20.10.11+incompatible
+	github.com/gofrs/flock v0.8.1
+	github.com/kelseyhightower/envconfig v1.4.0
+	github.com/leekchan/timeutil v0.0.0-20150802142658-28917288c48d
+	github.com/minio/minio-go/v7 v7.0.16
+	github.com/otiai10/copy v1.7.0
+	github.com/sirupsen/logrus v1.8.1
+	github.com/studio-b12/gowebdav v0.0.0-20211109083228-3f8721cd4b6f
+	golang.org/x/crypto v0.0.0-20210817164053-32db794688a5
+)
+
+require (
+	github.com/Microsoft/go-winio v0.4.17 // indirect
+	github.com/containerd/containerd v1.5.5 // indirect
+	github.com/cosiner/argv v0.1.0 // indirect
+	github.com/docker/distribution v2.7.1+incompatible // indirect
+	github.com/docker/go-connections v0.4.0 // indirect
+	github.com/docker/go-units v0.4.0 // indirect
+	github.com/dustin/go-humanize v1.0.0 // indirect
+	github.com/fatih/color v1.10.0 // indirect
+	github.com/fsnotify/fsnotify v1.4.9 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang/protobuf v1.5.0 // indirect
+	github.com/google/uuid v1.3.0 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/compress v1.13.6 // indirect
+	github.com/klauspost/cpuid/v2 v2.0.9 // indirect
+	github.com/mattn/go-colorable v0.1.8 // indirect
+	github.com/mattn/go-isatty v0.0.12 // indirect
+	github.com/minio/md5-simd v1.1.2 // indirect
+	github.com/minio/sha256-simd v1.0.0 // indirect
+	github.com/mitchellh/go-homedir v1.1.0 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/morikuni/aec v1.0.0 // indirect
+	github.com/nxadm/tail v1.4.6 // indirect
+	github.com/onsi/ginkgo v1.14.2 // indirect
+	github.com/onsi/gomega v1.10.3 // indirect
+	github.com/opencontainers/go-digest v1.0.0 // indirect
+	github.com/opencontainers/image-spec v1.0.1 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/rs/xid v1.3.0 // indirect
+	golang.org/x/net v0.0.0-20210226172049-e18ecbb05110 // indirect
+	golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1 // indirect
+	golang.org/x/text v0.3.6 // indirect
+	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+	google.golang.org/genproto v0.0.0-20201110150050-8816d57aaa9a // indirect
+	google.golang.org/grpc v1.33.2 // indirect
+	google.golang.org/protobuf v1.26.0 // indirect
+	gopkg.in/ini.v1 v1.65.0 // indirect
+	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+)
--- a/go.sum
+++ b/go.sum
--- a/src/backup.sh
+++ b/src/backup.sh
@@ -1,95 +0,0 @@
-#!/bin/sh
-
-# Copyright 2021 - Offen Authors <hioffen@posteo.de>
-# SPDX-License-Identifier: MPL-2.0
-
-# Portions of this file are taken from github.com/futurice/docker-volume-backup
-# See NOTICE for information about authors and licensing.
-
-source env.sh
-
-function info {
-  echo -e "\n[INFO] $1\n"
-}
-
-info "Preparing backup"
-DOCKER_SOCK="/var/run/docker.sock"
-
-if [ -S "$DOCKER_SOCK" ]; then
-  TEMPFILE="$(mktemp)"
-  docker ps \
-    --format "{{.ID}}" \
-    --filter "label=docker-volume-backup.stop-during-backup=true" \
-    > "$TEMPFILE"
-  CONTAINERS_TO_STOP="$(cat $TEMPFILE | tr '\n' ' ')"
-  CONTAINERS_TO_STOP_TOTAL="$(cat $TEMPFILE | wc -l)"
-  CONTAINERS_TOTAL="$(docker ps --format "{{.ID}}" | wc -l)"
-  rm "$TEMPFILE"
-  echo "$CONTAINERS_TOTAL containers running on host in total."
-  echo "$CONTAINERS_TO_STOP_TOTAL containers marked to be stopped during backup."
-else
-  CONTAINERS_TO_STOP_TOTAL="0"
-  CONTAINERS_TOTAL="0"
-  echo "Cannot access \"$DOCKER_SOCK\", won't look for containers to stop."
-fi
-
-if [ "$CONTAINERS_TO_STOP_TOTAL" != "0" ]; then
-  info "Stopping containers"
-  docker stop $CONTAINERS_TO_STOP
-fi
-
-info "Creating backup"
-BACKUP_FILENAME="$(date +"${BACKUP_FILENAME:-backup-%Y-%m-%dT%H-%M-%S.tar.gz}")"
-tar -czvf "$BACKUP_FILENAME" $BACKUP_SOURCES # allow the var to expand, in case we have multiple sources
-
-if [ ! -z "$GPG_PASSPHRASE" ]; then
-  info "Encrypting backup"
-  gpg --symmetric --cipher-algo aes256 --batch --passphrase "$GPG_PASSPHRASE" \
-    -o "${BACKUP_FILENAME}.gpg" $BACKUP_FILENAME
-  rm $BACKUP_FILENAME
-  BACKUP_FILENAME="${BACKUP_FILENAME}.gpg"
-fi
-
-if [ "$CONTAINERS_TO_STOP_TOTAL" != "0" ]; then
-  info "Starting containers back up"
-  docker start $CONTAINERS_TO_STOP
-fi
-
-if [ ! -z "$AWS_S3_BUCKET_NAME" ]; then
-  info "Uploading backup to remote storage"
-  echo "Will upload to bucket \"$AWS_S3_BUCKET_NAME\"."
-  mc cp "$BACKUP_FILENAME" "backup-target/$AWS_S3_BUCKET_NAME"
-  echo "Upload finished."
-fi
-
-if [ -f "$BACKUP_FILENAME" ]; then
-  info "Cleaning up"
-  rm -vf "$BACKUP_FILENAME"
-fi
-
-info "Backup finished"
-echo "Will wait for next scheduled backup."
-
-if [ ! -z "$BACKUP_RETENTION_DAYS" ]; then
-  info "Pruning old backups"
-  echo "Sleeping ${BACKUP_PRUNING_LEEWAY} before checking eligibility."
-  bucket=$AWS_S3_BUCKET_NAME
-
-  rule_applies_to=$(mc rm --fake --recursive -force --older-than "${BACKUP_RETENTION_DAYS}d" "backup-target/$bucket" | wc -l)
-  if [ "$rule_applies_to" == "0" ]; then
-    echo "No backups found older than the configured retention period of $BACKUP_RETENTION_DAYS days."
-    echo "Doing nothing."
-    exit 0
-  fi
-
-  total=$(mc ls "backup-target/$bucket" | wc -l)
-
-  if [ "$rule_applies_to" == "$total" ]; then
-    echo "Using a retention of ${BACKUP_RETENTION_DAYS} days would prune all currently existing backups, will not continue."
-    echo "If this is what you want, please remove files manually instead of using this script."
-    exit 1
-  fi
-
-  mc rm --recursive -force --older-than "${BACKUP_RETENTION_DAYS}d" "backup-target/$bucket"
-  echo "Successfully pruned ${rule_applies_to} backups older than ${BACKUP_RETENTION_DAYS} days."
-fi
--- a/src/entrypoint.sh
+++ b/src/entrypoint.sh
@@ -1,36 +0,0 @@
-#!/bin/sh
-
-# Copyright 2021 - Offen Authors <hioffen@posteo.de>
-# SPDX-License-Identifier: MPL-2.0
-
-# Portions of this file are taken from github.com/futurice/docker-volume-backup
-# See NOTICE for information about authors and licensing.
-
-set -e
-
-# Write cronjob env to file, fill in sensible defaults, and read them back in
-cat <<EOF > env.sh
-BACKUP_SOURCES="${BACKUP_SOURCES:-/backup}"
-BACKUP_CRON_EXPRESSION="${BACKUP_CRON_EXPRESSION:-@daily}"
-BACKUP_FILENAME=${BACKUP_FILENAME:-"backup-%Y-%m-%dT%H-%M-%S.tar.gz"}
-
-BACKUP_RETENTION_DAYS="${BACKUP_RETENTION_DAYS:-}"
-BACKUP_PRUNING_LEEWAY="${BACKUP_PRUNING_LEEWAY:-10m}"
-
-AWS_S3_BUCKET_NAME="${AWS_S3_BUCKET_NAME:-}"
-AWS_ENDPOINT="${AWS_ENDPOINT:-s3.amazonaws.com}"
-
-GPG_PASSPHRASE="${GPG_PASSPHRASE:-}"
-EOF
-chmod a+x env.sh
-source env.sh
-
-mc alias set backup-target "https://$AWS_ENDPOINT" "$AWS_ACCESS_KEY_ID" "$AWS_SECRET_ACCESS_KEY"
-
-# Add our cron entry, and direct stdout & stderr to Docker commands stdout
-echo "Installing cron.d entry with expression $BACKUP_CRON_EXPRESSION."
-echo "$BACKUP_CRON_EXPRESSION backup 2>&1" | crontab -
-
-# Let cron take the wheel
-echo "Starting cron in foreground."
-crond -f -l 8
--- a/test/cli/run.sh
+++ b/test/cli/run.sh
@@ -0,0 +1,67 @@
+#!/bin/sh
+
+set -e
+
+cd $(dirname $0)
+
+docker network create test_network
+docker volume create backup_data
+docker volume create app_data
+# This volume is created to test whether empty directories are handled
+# correctly. It is not supposed to hold any data.
+docker volume create empty_data
+
+docker run -d \
+  --name minio \
+  --network test_network \
+  --env MINIO_ROOT_USER=test \
+  --env MINIO_ROOT_PASSWORD=test \
+  --env MINIO_ACCESS_KEY=test \
+  --env MINIO_SECRET_KEY=GMusLtUmILge2by+z890kQ \
+  -v backup_data:/data \
+  minio/minio:RELEASE.2020-08-04T23-10-51Z server /data
+
+docker exec minio mkdir -p /data/backup
+
+docker run -d \
+  --name offen \
+  --network test_network \
+  -v app_data:/var/opt/offen/ \
+  offen/offen:latest
+
+sleep 10
+
+docker run --rm \
+  --network test_network \
+  -v app_data:/backup/app_data \
+  -v empty_data:/backup/empty_data \
+  -v /var/run/docker.sock:/var/run/docker.sock \
+  --env AWS_ACCESS_KEY_ID=test \
+  --env AWS_SECRET_ACCESS_KEY=GMusLtUmILge2by+z890kQ \
+  --env AWS_ENDPOINT=minio:9000 \
+  --env AWS_ENDPOINT_PROTO=http \
+  --env AWS_S3_BUCKET_NAME=backup \
+  --env BACKUP_FILENAME=test.tar.gz \
+  --env "BACKUP_FROM_SNAPSHOT=true" \
+  --entrypoint backup \
+  offen/docker-volume-backup:${TEST_VERSION:-canary}
+
+docker run --rm -it \
+  -v backup_data:/data alpine \
+  ash -c 'tar -xvf /data/backup/test.tar.gz && test -f /backup/app_data/offen.db && test -d /backup/empty_data'
+
+echo "[TEST:PASS] Found relevant files in untared remote backup."
+
+# This test does not stop containers during backup. This is happening on
+# purpose in order to cover this setup as well.
+if [ "$(docker ps -q | wc -l)" != "2" ]; then
+  echo "[TEST:FAIL] Expected all containers to be running post backup, instead seen:"
+  docker ps
+  exit 1
+fi
+
+echo "[TEST:PASS] All containers running post backup."
+
+docker rm $(docker stop minio offen)
+docker volume rm backup_data app_data
+docker network rm test_network
--- a/test/commands/.gitignore
+++ b/test/commands/.gitignore
@@ -0,0 +1 @@
+local
--- a/test/commands/docker-compose.yml
+++ b/test/commands/docker-compose.yml
@@ -0,0 +1,36 @@
+version: '3.8'
+
+services:
+  database:
+    image: mariadb:10.7
+    deploy:
+      restart_policy:
+        condition: on-failure
+    environment:
+      MARIADB_ROOT_PASSWORD: test
+      MARIADB_DATABASE: backup
+    labels:
+      - docker-volume-backup.exec-pre=/bin/sh -c 'mysqldump -ptest --all-databases > /tmp/volume/dump.sql'
+      - docker-volume-backup.exec-post=/bin/sh -c 'echo "post" > /tmp/volume/post.txt'
+      - docker-volume-backup.exec-label=test
+    volumes:
+      - app_data:/tmp/volume
+
+  backup:
+    image: offen/docker-volume-backup:${TEST_VERSION:-canary}
+    deploy:
+      restart_policy:
+        condition: on-failure
+    environment:
+      BACKUP_FILENAME: test.tar.gz
+      BACKUP_CRON_EXPRESSION: 0 0 5 31 2 ?
+      EXEC_LABEL: test
+      EXEC_FORWARD_OUTPUT: "true"
+    volumes:
+      - archive:/archive
+      - app_data:/backup/data:ro
+      - /var/run/docker.sock:/var/run/docker.sock
+
+volumes:
+  app_data:
+  archive:
--- a/test/commands/run.sh
+++ b/test/commands/run.sh
@@ -0,0 +1,62 @@
+#!/bin/sh
+
+set -e
+
+cd $(dirname $0)
+
+
+docker-compose up -d
+sleep 30 # mariadb likes to take a bit before responding
+
+docker-compose exec backup backup
+sudo cp -r $(docker volume inspect --format='{{ .Mountpoint }}' commands_archive) ./local
+
+tar -xvf ./local/test.tar.gz
+if [ ! -f ./backup/data/dump.sql ]; then
+  echo "[TEST:FAIL] Could not find file written by pre command."
+  exit 1
+fi
+echo "[TEST:PASS] Found expected file."
+
+if [ -f ./backup/data/post.txt ]; then
+  echo "[TEST:FAIL] File created in post command was present in backup."
+  exit 1
+fi
+echo "[TEST:PASS] Did not find unexpected file."
+
+docker-compose down --volumes
+sudo rm -rf ./local
+
+
+echo "[TEST:INFO] Running commands test in swarm mode next."
+
+docker swarm init
+
+docker stack deploy --compose-file=docker-compose.yml test_stack
+
+while [ -z $(docker ps -q -f name=backup) ]; do
+  echo "[TEST:INFO] Backup container not ready yet. Retrying."
+  sleep 1
+done
+
+sleep 20
+
+docker exec $(docker ps -q -f name=backup) backup
+
+sudo cp -r $(docker volume inspect --format='{{ .Mountpoint }}' test_stack_archive) ./local
+
+tar -xvf ./local/test.tar.gz
+if [ ! -f ./backup/data/dump.sql ]; then
+  echo "[TEST:FAIL] Could not find file written by pre command."
+  exit 1
+fi
+echo "[TEST:PASS] Found expected file."
+
+if [ -f ./backup/data/post.txt ]; then
+  echo "[TEST:FAIL] File created in post command was present in backup."
+  exit 1
+fi
+echo "[TEST:PASS] Did not find unexpected file."
+
+docker stack rm test_stack
+docker swarm leave --force
--- a/test/compose/.gitignore
+++ b/test/compose/.gitignore
@@ -0,0 +1 @@
+local
--- a/test/compose/docker-compose.yml
+++ b/test/compose/docker-compose.yml
@@ -0,0 +1,64 @@
+version: '3'
+
+services:
+  minio:
+    image: minio/minio:RELEASE.2020-08-04T23-10-51Z
+    environment:
+      MINIO_ROOT_USER: test
+      MINIO_ROOT_PASSWORD: test
+      MINIO_ACCESS_KEY: test
+      MINIO_SECRET_KEY: GMusLtUmILge2by+z890kQ
+    entrypoint: /bin/ash -c 'mkdir -p /data/backup && minio server /data'
+    volumes:
+      - minio_backup_data:/data
+
+  webdav:
+    image: bytemark/webdav:2.4
+    environment:
+      AUTH_TYPE: Digest
+      USERNAME: test
+      PASSWORD: test
+    volumes:
+      - webdav_backup_data:/var/lib/dav
+
+  backup: &default_backup_service
+    image: offen/docker-volume-backup:${TEST_VERSION:-canary}
+    hostname: hostnametoken
+    depends_on:
+      - minio
+      - webdav
+    restart: always
+    environment:
+      AWS_ACCESS_KEY_ID: test
+      AWS_SECRET_ACCESS_KEY: GMusLtUmILge2by+z890kQ
+      AWS_ENDPOINT: minio:9000
+      AWS_ENDPOINT_PROTO: http
+      AWS_S3_BUCKET_NAME: backup
+      BACKUP_FILENAME_EXPAND: 'true'
+      BACKUP_FILENAME: test-$$HOSTNAME.tar.gz
+      BACKUP_LATEST_SYMLINK: test-$$HOSTNAME.latest.tar.gz.gpg
+      BACKUP_CRON_EXPRESSION: 0 0 5 31 2 ?
+      BACKUP_RETENTION_DAYS: ${BACKUP_RETENTION_DAYS:-7}
+      BACKUP_PRUNING_LEEWAY: 5s
+      BACKUP_PRUNING_PREFIX: test
+      GPG_PASSPHRASE: 1234secret
+      WEBDAV_URL: http://webdav/
+      WEBDAV_PATH: /my/new/path/
+      WEBDAV_USERNAME: test
+      WEBDAV_PASSWORD: test
+    volumes:
+      - ./local:/archive
+      - app_data:/backup/app_data:ro
+      - /var/run/docker.sock:/var/run/docker.sock
+
+  offen:
+    image: offen/offen:latest
+    labels:
+      - docker-volume-backup.stop-during-backup=true
+    volumes:
+      - app_data:/var/opt/offen
+
+volumes:
+  minio_backup_data:
+  webdav_backup_data:
+  app_data:
--- a/test/compose/run.sh
+++ b/test/compose/run.sh
@@ -0,0 +1,68 @@
+#!/bin/sh
+
+set -e
+
+cd $(dirname $0)
+
+mkdir -p local
+
+docker-compose up -d
+sleep 5
+
+# A symlink for a known file in the volume is created so the test can check
+# whether symlinks are preserved on backup.
+docker-compose exec offen ln -s /var/opt/offen/offen.db /var/opt/offen/db.link
+docker-compose exec backup backup
+
+sleep 5
+if [ "$(docker-compose ps -q | wc -l)" != "4" ]; then
+  echo "[TEST:FAIL] Expected all containers to be running post backup, instead seen:"
+  docker-compose ps
+  exit 1
+fi
+echo "[TEST:PASS] All containers running post backup."
+
+
+docker run --rm -it \
+  -v compose_minio_backup_data:/minio_data \
+  -v compose_webdav_backup_data:/webdav_data alpine \
+  ash -c 'apk add gnupg && \
+          echo 1234secret | gpg -d --pinentry-mode loopback --passphrase-fd 0 --yes /minio_data/backup/test-hostnametoken.tar.gz.gpg > /tmp/test-hostnametoken.tar.gz && tar -xvf /tmp/test-hostnametoken.tar.gz -C /tmp && test -f /tmp/backup/app_data/offen.db && \
+          echo 1234secret | gpg -d --pinentry-mode loopback --passphrase-fd 0 --yes /webdav_data/data/my/new/path/test-hostnametoken.tar.gz.gpg > /tmp/test-hostnametoken.tar.gz && tar -xvf /tmp/test-hostnametoken.tar.gz -C /tmp && test -f /tmp/backup/app_data/offen.db'
+
+echo "[TEST:PASS] Found relevant files in decrypted and untared remote backups."
+
+echo 1234secret | gpg -d --pinentry-mode loopback --yes --passphrase-fd 0 ./local/test-hostnametoken.tar.gz.gpg > ./local/decrypted.tar.gz
+tar -xf ./local/decrypted.tar.gz -C /tmp && test -f /tmp/backup/app_data/offen.db
+rm ./local/decrypted.tar.gz
+test -L /tmp/backup/app_data/db.link
+
+echo "[TEST:PASS] Found relevant files in decrypted and untared local backup."
+
+test -L ./local/test-hostnametoken.latest.tar.gz.gpg
+echo "[TEST:PASS] Found symlink to latest version in local backup."
+
+# The second part of this test checks if backups get deleted when the retention
+# is set to 0 days (which it should not as it would mean all backups get deleted)
+# TODO: find out if we can test actual deletion without having to wait for a day
+BACKUP_RETENTION_DAYS="0" docker-compose up -d
+sleep 5
+
+docker-compose exec backup backup
+
+docker run --rm -it \
+  -v compose_minio_backup_data:/minio_data \
+  -v compose_webdav_backup_data:/webdav_data alpine \
+  ash -c '[ $(find /minio_data/backup/ -type f | wc -l) = "1" ] && \
+          [ $(find /webdav_data/data/my/new/path/ -type f | wc -l) = "1" ]'
+
+echo "[TEST:PASS] Remote backups have not been deleted."
+
+if [ "$(find ./local -type f | wc -l)" != "1" ]; then
+  echo "[TEST:FAIL] Backups should not have been deleted, instead seen:"
+  find ./local -type f
+  exit 1
+fi
+echo "[TEST:PASS] Local backups have not been deleted."
+
+docker-compose down --volumes
--- a/test/notifications/.gitignore
+++ b/test/notifications/.gitignore
@@ -0,0 +1 @@
+local
--- a/test/notifications/docker-compose.yml
+++ b/test/notifications/docker-compose.yml
@@ -0,0 +1,36 @@
+version: '3'
+
+services:
+  backup:
+    image: offen/docker-volume-backup:${TEST_VERSION:-canary}
+    restart: always
+    environment:
+      BACKUP_FILENAME: test.tar.gz
+      BACKUP_CRON_EXPRESSION: 0 0 5 31 2 ?
+      BACKUP_PRUNING_PREFIX: test
+      NOTIFICATION_LEVEL: info
+      NOTIFICATION_URLS: ${NOTIFICATION_URLS}
+    volumes:
+      - ./local:/archive
+      - app_data:/backup/app_data:ro
+      - ./notifications.tmpl:/etc/dockervolumebackup/notifications.d/notifications.tmpl
+
+  offen:
+    image: offen/offen:latest
+    labels:
+      - docker-volume-backup.stop-during-backup=true
+    volumes:
+      - app_data:/var/opt/offen
+
+  gotify:
+    image: gotify/server
+    ports:
+      - 8080:80
+    environment:
+      - GOTIFY_DEFAULTUSER_PASS=custom
+    volumes:
+      - gotify_data:/app/data
+
+volumes:
+  app_data:
+  gotify_data:
--- a/test/notifications/notifications.tmpl
+++ b/test/notifications/notifications.tmpl
@@ -0,0 +1,7 @@
+{{ define "title_success" -}}
+Successful test run, yay!
+{{- end }}
+
+{{ define "body_success" -}}
+Backing up {{ .Stats.BackupFile.FullPath }} succeeded.
+{{- end }}
--- a/test/notifications/run.sh
+++ b/test/notifications/run.sh
@@ -0,0 +1,52 @@
+#!/bin/sh
+
+set -e
+
+cd $(dirname $0)
+
+mkdir -p local
+
+docker-compose up -d
+sleep 5
+
+GOTIFY_TOKEN=$(curl -sSLX POST -H 'Content-Type: application/json' -d '{"name":"test"}' http://admin:custom@localhost:8080/application | jq -r '.token')
+echo "[TEST:INFO] Set up Gotify application using token $GOTIFY_TOKEN"
+
+docker-compose exec backup backup
+
+NUM_MESSAGES=$(curl -sSL http://admin:custom@localhost:8080/message | jq -r '.messages | length')
+if [ "$NUM_MESSAGES" != 0 ]; then
+  echo "[TEST:FAIL] Expected no notifications to be sent when not configured"
+  exit 1
+fi
+echo "[TEST:PASS] No notifications were sent when not configured."
+
+docker-compose down
+
+NOTIFICATION_URLS="gotify://gotify/${GOTIFY_TOKEN}?disableTLS=true" docker-compose up -d
+
+docker-compose exec backup backup
+
+NUM_MESSAGES=$(curl -sSL http://admin:custom@localhost:8080/message | jq -r '.messages | length')
+if [ "$NUM_MESSAGES" != 1 ]; then
+  echo "[TEST:FAIL] Expected one notifications to be sent when configured"
+  exit 1
+fi
+echo "[TEST:PASS] Correct number of notifications were sent when configured."
+
+MESSAGE_TITLE=$(curl -sSL http://admin:custom@localhost:8080/message | jq -r '.messages[0].title')
+MESSAGE_BODY=$(curl -sSL http://admin:custom@localhost:8080/message | jq -r '.messages[0].message')
+
+if [ "$MESSAGE_TITLE" != "Successful test run, yay!" ]; then
+  echo "[TEST:FAIL] Unexpected notification title $MESSAGE_TITLE"
+  exit 1
+fi
+echo "[TEST:PASS] Custom notification title was used."
+
+if [ "$MESSAGE_BODY" != "Backing up /tmp/test.tar.gz succeeded." ]; then
+  echo "[TEST:FAIL] Unexpected notification body $MESSAGE_BODY"
+  exit 1
+fi
+echo "[TEST:PASS] Custom notification body was used."
+
+docker-compose down --volumes
--- a/test/ownership/.gitignore
+++ b/test/ownership/.gitignore
@@ -0,0 +1 @@
+local
--- a/test/ownership/docker-compose.yml
+++ b/test/ownership/docker-compose.yml
@@ -0,0 +1,27 @@
+version: '3'
+
+services:
+  db:
+    image: postgres:14-alpine
+    restart: unless-stopped
+    labels:
+      - docker-volume-backup.stop-during-backup=true
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    environment:
+      - POSTGRES_PASSWORD=1FHJMSwt0yhIN1zS7I4DilGUhThBKq0x
+      - POSTGRES_USER=test
+      - POSTGRES_DB=test
+
+  backup:
+    image: offen/docker-volume-backup:${TEST_VERSION}
+    restart: always
+    environment:
+      BACKUP_FILENAME: backup.tar.gz
+    volumes:
+      - postgres_data:/backup/postgres:ro
+      - /var/run/docker.sock:/var/run/docker.sock:ro
+      - ./local:/archive
+
+volumes:
+  postgres_data:
--- a/test/ownership/run.sh
+++ b/test/ownership/run.sh
@@ -0,0 +1,28 @@
+#!/bin/sh
+# This test refers to https://github.com/offen/docker-volume-backup/issues/71
+
+set -e
+
+cd $(dirname $0)
+
+mkdir -p local
+
+docker-compose up -d
+sleep 5
+
+docker-compose exec backup backup
+
+sudo tar --same-owner -xvf ./local/backup.tar.gz -C /tmp
+
+sudo find /tmp/backup/postgres > /dev/null
+echo "[TEST:PASS] Backup contains files at expected location"
+
+for file in $(sudo find /tmp/backup/postgres); do
+  if [ "$(sudo stat -c '%u:%g' $file)" != "70:70" ]; then
+    echo "[TEST:FAIL] Unexpected file ownership for $file: $(sudo stat -c '%u:%g' $file)"
+    exit 1
+  fi
+done
+echo "[TEST:PASS] All files and directories in backup preserved their ownership."
+
+docker-compose down --volumes
--- a/test/swarm/docker-compose.yml
+++ b/test/swarm/docker-compose.yml
@@ -0,0 +1,65 @@
+# Copyright 2020-2021 - Offen Authors <hioffen@posteo.de>
+# SPDX-License-Identifier: Unlicense
+
+version: '3.8'
+
+services:
+  minio:
+    image: minio/minio:RELEASE.2020-08-04T23-10-51Z
+    deploy:
+      restart_policy:
+        condition: on-failure
+    environment:
+      MINIO_ROOT_USER: test
+      MINIO_ROOT_PASSWORD: test
+      MINIO_ACCESS_KEY: test
+      MINIO_SECRET_KEY: GMusLtUmILge2by+z890kQ
+    entrypoint: /bin/ash -c 'mkdir -p /data/backup && minio server /data'
+    volumes:
+      - backup_data:/data
+
+  backup:
+    image: offen/docker-volume-backup:${TEST_VERSION:-canary}
+    depends_on:
+      - minio
+    deploy:
+      restart_policy:
+        condition: on-failure
+    environment:
+      AWS_ACCESS_KEY_ID: test
+      AWS_SECRET_ACCESS_KEY: GMusLtUmILge2by+z890kQ
+      AWS_ENDPOINT: minio:9000
+      AWS_ENDPOINT_PROTO: http
+      AWS_S3_BUCKET_NAME: backup
+      BACKUP_FILENAME: test.tar.gz
+      BACKUP_CRON_EXPRESSION: 0 0 5 31 2 ?
+      BACKUP_RETENTION_DAYS: 7
+      BACKUP_PRUNING_LEEWAY: 5s
+    volumes:
+      - pg_data:/backup/pg_data:ro
+      - /var/run/docker.sock:/var/run/docker.sock
+
+  offen:
+    image: offen/offen:latest
+    labels:
+      - docker-volume-backup.stop-during-backup=true
+    deploy:
+      replicas: 2
+      restart_policy:
+        condition: on-failure
+
+  pg:
+    image: postgres:14-alpine
+    environment:
+      POSTGRES_PASSWORD: example
+    labels:
+      - docker-volume-backup.stop-during-backup=true
+    volumes:
+      - pg_data:/var/lib/postgresql/data
+    deploy:
+      restart_policy:
+        condition: on-failure
+
+volumes:
+  backup_data:
+  pg_data:
--- a/test/swarm/run.sh
+++ b/test/swarm/run.sh
@@ -0,0 +1,35 @@
+#!/bin/sh
+
+set -e
+
+cd $(dirname $0)
+
+docker swarm init
+
+docker stack deploy --compose-file=docker-compose.yml test_stack
+
+while [ -z $(docker ps -q -f name=backup) ]; do
+  echo "[TEST:INFO] Backup container not ready yet. Retrying."
+  sleep 1
+done
+
+sleep 20
+
+docker exec $(docker ps -q -f name=backup) backup
+
+docker run --rm -it \
+  -v test_stack_backup_data:/data alpine \
+  ash -c 'tar -xf /data/backup/test.tar.gz && test -f /backup/pg_data/PG_VERSION'
+
+echo "[TEST:PASS] Found relevant files in untared backup."
+
+sleep 5
+if [ "$(docker ps -q | wc -l)" != "5" ]; then
+  echo "[TEST:FAIL] Expected all containers to be running post backup, instead seen:"
+  docker ps -a
+  exit 1
+fi
+echo "[TEST:PASS] All containers running post backup."
+
+docker stack rm test_stack
+docker swarm leave --force
--- a/test/test.sh
+++ b/test/test.sh
@@ -0,0 +1,17 @@
+#!/bin/sh
+
+set -e
+
+TEST_VERSION=${1:-canary}
+
+for dir in $(ls -d -- */); do
+  test="${dir}run.sh"
+  echo "################################################"
+  echo "Now running $test"
+  echo "################################################"
+  echo ""
+  TEST_VERSION=$TEST_VERSION /bin/sh $test
+  echo ""
+  echo "$test passed"
+  echo ""
+done
Author	SHA1	Message	Date
Rajan Patel	00f2359461	Add DOCKER_HOST documentation (#74 ) * add DOCKER_HOST documentation * add which endpoints are required for DOCKER_HOST * Update README.md Co-authored-by: Frederik Ring <frederik.ring@gmail.com>	2022-02-22 08:00:26 +01:00
Frederik Ring	0504a92a1f	Add option to run pre/post commands for any container (#73 ) * Add option to run pre commands on arbitrary container * Correctly handle quoted args in commands * Provide defaults for test version arg * Allow filtering of target containers * Add documentation on exec commands * Use mysqldump in exec test * Add mysqldump section to recipes * Also run commands test in swarm mode * Use name instead of id * Add syntax highlighting * Add missing license headers	2022-02-22 07:53:33 +01:00
Frederik Ring	3ded77448c	Do not skip directories when creating tar archive (#72 ) * Update targz library to include potential ownership fix * Move archive logic to main repo * Remove assertions for debugging * Use relative path in assertion * Strip local part from archive location * Log when extracting in tests * Fix trimming of prfix * Add license info to archive.go file * Undo change in test assertion * Add test checking for preserved file ownership * use same postgres version in tests * Wrap errors when archiving, handle deletion at script layer	2022-02-22 07:49:24 +01:00
Frederik Ring	58b42b9036	Supporting proxied Docker APIs through DOCKER_HOST (#70 )	2022-02-18 09:08:21 +01:00
Frederik Ring	180438f1fc	Update ubuntu image used for running integration tests (#67 )	2022-02-15 21:05:03 +01:00
Mauro Molin	30265c14ba	Fixed TookTime (#66 )	2022-02-14 17:32:05 +01:00
Frederik Ring	a57e93d01e	Split source into multiple files, deduplicate pruning logic, do not parse templates when notifications are not used (#63 ) * Split code into multiple files * Deduplicate logic for pruning backups against different storages * Only parse templates when notifications are enabled * Use better description	2022-02-13 10:52:19 +01:00
Frederik Ring	3e17d1b123	Ensure end time is recorded for unsuccessful runs too (#62 ) * Ensure end time is also recorded for unsuccessful runs * Clean up integration tests	2022-02-13 09:41:36 +01:00
Frederik Ring	0e248010a8	Add note about how notifications can be customized to config reference	2022-02-12 20:34:51 +01:00
Frederik Ring	e6af6efd8a	Add test setup for notification feature (#61 ) * Add test case for notification feature * Fix template data * bash is needed to interpret test * Do not use bashisms in test * Only print FullPath * Fix assertion	2022-02-12 20:28:38 +01:00
Frederik Ring	34d04211eb	Update README TOC	2022-02-11 20:06:23 +01:00
Mauro Molin	8dfdd14527	Added custom notification messages using text/template (#60 ) * Added custom notification messages using text/template * Change notification template path and removed automatic newline trim * Added stats and changed structure of template params * Stat file hotfix * Embedded and fixed default notification templates Fix * Changed Output to LogOutput * Changed stats integer to unsigned * Bytes formatting in template func fix * Changed Archives to Storages * Removed unecessary sleep for pruning leeway * Set EndTime after pruning is completed * Added custom notifications documentation * Added 5s sleep in swarm test * Fixed documentation * Dockerfile copies all files in cmd/backup	2022-02-11 20:05:16 +01:00
Frederik Ring	3bb99a7117	Update package targz	2022-02-08 15:12:46 +01:00
Fridgemagnet	ddc34be55d	Updated README.md "Restoring..." section example (#56 ) Edited the "Restoring a volume from a backup" section example to be able to better differentiate between the names of the temporary restore container and the name of the mounted restore volume. New example container name: temp_restore_container The restore volume name remains the same: backup_restore Also changed "one-off container" to "once-off container".	2022-02-04 11:52:59 +01:00
Joshua Noble	cb9b4bfcff	Add support for Filebase (#54 )	2022-02-02 17:22:42 +01:00
Frederik Ring	62bd2f4a5a	Update base docker image to alpine 3.15 (#53 )	2022-01-27 14:40:56 +01:00
Frederik Ring	6fe629ce87	Allow path to be set for bucket storage (#52 )	2022-01-25 21:16:16 +01:00
Frederik Ring	1db896f7cf	Tweak README, improve client naming, tidy go.mod file	2022-01-22 13:35:13 +01:00
Kaerbr	6ded00aa06	Support Nextcloud / WebDav (#48 ) * add studio-b12/gowebdav to be able to upload to webdav server * make sure all env variables are present for webdav upload * implement file upload to WebDav server directory defaults to the base directory * docs: add the new feature to the documentation * if no WebDav env variable are given throw no error * docs: use more elegant english :D Co-authored-by: Frederik Ring <frederik.ring@gmail.com> * docs: use official spelling of "WebDAV" * perf: golang likes to return early instead of having an else block * use WEBDAV_PATH instead of WEBDAV_DIRECTORY * use split_words for more convenience like shown here: https://github.com/kelseyhightower/envconfig#struct-tag-support * simplify * feat: add pruning of files in WebDAV remote Based on / Inspired by the minio/S3 implementation of pruning remote files. * remove logging from the development * test: first try implementing tests Sandly I have to use the remote pipeline -- local wont work for me. * test: adapt used volume names * test: specify image only once! * test: minio AND webdav data should be present * test: backups on WebDAV remote are laying in the root directory * test: the webdav server stores date in /var/lib/dav * trying with data subfolder * test: 1 container was added so the number raised from 3 to 4 * webdav subfolder is "data" not "backup" * fix: password AND username must be defined not password OR username * improve logging * feat: if the given path on the server isnt preset it will be created * test: add creation of new folder for webdav to tests Co-authored-by: Frederik Ring <frederik.ring@gmail.com>	2022-01-22 13:29:21 +01:00
Hendrik Niefeld	6b79f1914b	Update README.md	2022-01-06 16:09:33 +01:00
Hendrik Niefeld	40ff2e00c9	Update README.md	2022-01-06 16:07:00 +01:00
Frederik Ring	760cc9cebc	Add issue template	2021-12-29 13:10:43 +01:00
Frederik Ring	1f9582df51	Fix handling of empty directories (#44 ) * Add test checking whether empty directories are included in backups * Update targz library to include fix	2021-12-29 10:10:12 +01:00
Frederik Ring	32575c831e	Also expand env vars in pruning prefix if configured	2021-12-23 09:22:56 +01:00
Frederik Ring	c062710ce8	Allow for env substitution in backup filename (#39 )	2021-12-22 14:39:46 +01:00
Frederik Ring	3a7dfe8e60	Add note about double quoting issue in older compose versions	2021-12-18 13:24:14 +01:00
Frederik Ring	9ec33510e7	Extend docs on notifications	2021-12-18 10:31:12 +01:00
Frederik Ring	4207146fb6	Refactor calling of hooks on exit	2021-12-18 10:31:12 +01:00
Frederik Ring	1f727f698f	Run hooks in order of severity	2021-12-18 10:31:12 +01:00
Frederik Ring	88c90a206c	Use int comparison for checking hooks	2021-12-18 10:31:12 +01:00
Frederik Ring	8bad0656b3	Enable notifications on multiple levels	2021-12-18 10:31:12 +01:00
Frederik Ring	08d78a0bd6	allow sending notifications to multiple channels	2021-12-18 10:31:12 +01:00
Frederik Ring	5a6ce81b58	update github.com/otai/copy, use PreserveOwner option	2021-11-29 08:40:55 +01:00
Frederik Ring	dfd0d617e4	install bugfix releases where available	2021-11-28 20:12:23 +01:00
Frederik Ring	7bc5b2ccef	fix minor error scoping mistakes	2021-11-28 20:06:24 +01:00
Frederik Ring	b6ad624115	leverage docker cache for downloading go deps	2021-11-23 08:04:48 +01:00
Frederik Ring	210c7d4540	Reuse hook mechanism for scheduling clean up tasks (#33 ) * reuse hook mechanism for scheduling clean up tasks * register hooks before creating files or dirs * fix logging order * use typed hook levels	2021-11-08 19:10:10 +01:00
Frederik Ring	3c06bf8102	run cli test using BACKUP_FROM_SNAPSHOT	2021-11-08 08:44:59 +01:00
schwannden	411c39ee72	create a snapshot before creating tar archive (#32 ) * create a snapshot before creating tar archive * safeguard snapshot removal and make snapshot optional * fix typo, make sure remove snapshot failure triggers failure hook Co-authored-by: Schwannden Kuo <schwannden@mobagel.com>	2021-11-08 08:39:18 +01:00
Frederik Ring	0c666d0c88	use lstat when checking whether file is a symlink	2021-11-03 18:07:55 +01:00
Frederik Ring	a0402b407d	fix fileinfo mode comparison when checking for symlinks	2021-11-03 18:03:44 +01:00
Frederik Ring	3193e88fc0	os.FileInfo cannot be used for deleting files as it does not contain a full path	2021-11-02 06:40:37 +01:00
Frederik Ring	c391230be6	Merge pull request #31 from offen/exclude-symlink-candidates Exclude symlinks from candidates when pruning local files	2021-10-31 20:07:51 +01:00
Frederik Ring	f946f36fb0	exclude symlinks from candidates when pruning local files Previously, symlinks would be included in the set of candidates, but would be skipped when pruning. This could lead to a wrong number of candidates being printed in the log messages.	2021-10-29 09:00:37 +02:00
Frederik Ring	5245b5882f	update README, save some indentation	2021-10-28 19:55:39 +02:00
schwannden	7f0f173115	adding option to skip tls verification error (#30 ) * adding option to skip tls verification error * merge options * removed merged option from README Co-authored-by: Schwannden Kuo <schwannden@mobagel.com>	2021-10-28 19:51:35 +02:00
Frederik Ring	ad7ec58322	add syntax highlighting	2021-10-23 17:45:57 +02:00
Frederik Ring	b7ab2fbacc	add section about container timezones to the README	2021-10-23 17:44:30 +02:00
Frederik Ring	789fc656e8	Merge pull request #27 from offen/latest-symlink Automatically create symlink to latest local backup if configured	2021-10-01 18:47:16 +02:00
Frederik Ring	c59b40f2df	automatically create symlink to latest local backup if configured	2021-10-01 18:19:24 +02:00
Frederik Ring	cff418e735	fix README grammar	2021-10-01 08:48:20 +02:00
Frederik Ring	d7ccdd79fc	Merge pull request #26 from offen/instance-profile Allow s3 authentication via IAM role	2021-09-30 19:32:54 +02:00
Frederik Ring	bd73a2b5e4	allow s3 authentication via IAM role	2021-09-30 19:24:43 +02:00
Frederik Ring	6cf5cf47e7	Merge pull request #25 from offen/delete-on-failure Ensure script always tries to remove local artifacts even when backup failed	2021-09-13 09:33:12 +02:00
Frederik Ring	53c257065e	ensure script always tries to remove local artifacts even when backup failed	2021-09-12 10:48:19 +02:00
Frederik Ring	184b7a1e18	add docs on one off backups using docker cli	2021-09-11 11:21:48 +02:00
Frederik Ring	69a94f226b	tweak configuration reference for email settings	2021-09-10 11:58:33 +02:00
Frederik Ring	160a47e90b	allow registering hooks at different levels	2021-09-09 16:55:49 +02:00
Frederik Ring	59660ec5c7	include exit log message in notification	2021-09-09 11:08:05 +02:00
Frederik Ring	af3e69b7a8	fix typo in README	2021-09-09 09:19:37 +02:00
Frederik Ring	5d400cb943	Merge pull request #24 from offen/failure-email Enable sending out email notifications on failed backups	2021-09-09 09:10:20 +02:00
Frederik Ring	88368197c1	implement email notifications on failed backup runs	2021-09-09 09:00:23 +02:00
Frederik Ring	e46968ed79	call error hooks on script failure	2021-09-09 08:12:07 +02:00
Frederik Ring	2c06f81503	collect all log output in buffer so it could be used in notifications	2021-09-09 07:24:18 +02:00
Frederik Ring	55d030a06a	Merge pull request #22 from offen/targz-fork Fix handling of symlinks in backup targets	2021-09-06 18:15:34 +02:00
Frederik Ring	fefc34c6aa	tidy go mod file	2021-09-04 15:54:09 +02:00
Frederik Ring	5922820ada	add test for checking behavior on symlinks	2021-09-04 10:30:34 +02:00
Frederik Ring	8aba98c012	use forked version of package targz	2021-09-04 10:08:06 +02:00
Frederik Ring	70daa0308a	Merge pull request #19 from offen/golang-version v2 Rewrite	2021-08-30 19:57:36 +02:00
Frederik Ring	ede94bcd88	display all error messages instead of first one	2021-08-29 19:39:51 +02:00
Frederik Ring	aae97a5617	try restarting even when stopping some containers failed	2021-08-29 18:51:05 +02:00
Frederik Ring	825cbb50ef	always use background context directly	2021-08-29 18:26:40 +02:00
Frederik Ring	bea203af3d	improve documentation	2021-08-29 18:16:04 +02:00
Frederik Ring	6034e6a902	print proper local archive in log message	2021-08-29 08:36:45 +02:00
Frederik Ring	d0eca0a179	fix container stop execution order	2021-08-26 16:22:24 +02:00
Frederik Ring	a0fe2cf42d	handle errors on container restart	2021-08-26 12:50:22 +02:00
Frederik Ring	5334ff1a5a	refactor script initialization	2021-08-25 07:48:20 +02:00
Frederik Ring	e73256ad70	do not use start time as deadline	2021-08-24 09:15:43 +02:00
Frederik Ring	e0c4adc563	move handling of config to script layer	2021-08-24 09:01:44 +02:00
Frederik Ring	2469597848	fix lockfile mechanism	2021-08-23 18:46:49 +02:00
Frederik Ring	b1c4bee85d	use buffered reader to write to encryption mechanism	2021-08-23 17:34:13 +02:00
Frederik Ring	ec87bd27e7	do not use scanner to write file in chunks	2021-08-23 15:19:50 +02:00
Frederik Ring	f4f4fa9e74	use full filepath when pruning local backups	2021-08-23 14:56:04 +02:00
Frederik Ring	7086c6e645	read backup in small chunks when encrypting	2021-08-23 14:48:33 +02:00
Frederik Ring	411a62a6c7	shorten log messages	2021-08-23 14:48:33 +02:00
Frederik Ring	5a2bf48ec6	make sure backup also runs when socket isn't present	2021-08-23 14:48:33 +02:00
Frederik Ring	07b06cf0ba	read all configuration in init	2021-08-23 14:48:33 +02:00
Frederik Ring	4c80494433	use go native strftime version	2021-08-23 14:48:33 +02:00
Frederik Ring	7244725c5b	fix location of success message for having created local backup	2021-08-23 14:48:33 +02:00
Frederik Ring	935de92f2e	only tag proper releases as latest	2021-08-23 14:48:33 +02:00
Frederik Ring	d195e8967f	improve logging messages	2021-08-23 14:48:33 +02:00
Frederik Ring	188c14c00f	add insecure option, update docs	2021-08-23 14:48:33 +02:00
Frederik Ring	da9458724f	adapt repo layout to go	2021-08-23 14:48:33 +02:00
Frederik Ring	435583168b	add logging	2021-08-23 14:48:33 +02:00
Frederik Ring	67499d776c	refactor deferred cleanup actions to always run	2021-08-23 14:48:33 +02:00
Frederik Ring	8c99ec0bdf	implement pruning from remote storage	2021-08-23 14:48:33 +02:00
Frederik Ring	f2739b583e	add gpg encryption	2021-08-23 14:48:32 +02:00
Frederik Ring	78e4e3813b	implement deletion of local backups	2021-08-23 14:48:10 +02:00
Frederik Ring	4d9482a8b4	implement lock file to ensure backup runs mutually exclusive	2021-08-23 14:47:34 +02:00
Frederik Ring	0c6ac05789	implement copy to remote storage	2021-08-23 14:47:34 +02:00
Frederik Ring	8b110fd789	scaffold script flow	2021-08-23 14:47:34 +02:00
Frederik Ring	efb52aa806	try porting docker related parts to golang	2021-08-23 14:47:34 +02:00
Frederik Ring	4c84674650	Merge pull request #20 from offen/gpg-testcase Add testcase for gpg encryption	2021-08-23 14:47:11 +02:00
Frederik Ring	6fe81cdf2d	add testcase for gpg encryption	2021-08-23 14:42:50 +02:00
Frederik Ring	b7ba0e08df	prefix mtime param with a +, use -name param for passing pattern to find	2021-08-20 21:51:45 +02:00
Frederik Ring	b558a57de9	Merge pull request #17 from offen/local-prune Use find instead of mc for pruning local backups	2021-08-20 10:09:46 +02:00
Frederik Ring	278df9b2f7	use find instead of mc for pruning local backups	2021-08-20 10:01:46 +02:00
Frederik Ring	0782af88f4	fix blank variable when creating target	2021-08-19 16:35:21 +02:00
Frederik Ring	f82577fcb5	add prefix option to entrypoint script	2021-08-19 13:55:15 +02:00
Frederik Ring	7f261a54b6	Merge pull request #15 from offen/prune-prefix Allow passing prefix to limit pruning ops	2021-08-19 13:45:10 +02:00
Frederik Ring	0069faa7fd	allow passing prefix to limit pruning ops	2021-08-19 13:41:19 +02:00
Frederik Ring	8c7ffc3d99	Merge pull request #14 from offen/backup-archive allow local storage of backups	2021-08-19 11:14:04 +02:00
Frederik Ring	f6b40742b4	use go 1.17 in builder	2021-08-19 11:08:36 +02:00
Frederik Ring	767c21ef65	allow local storage of backups	2021-08-19 10:35:39 +02:00
Frederik Ring	4b59089e3d	add note about how the endpoint does not include a protocol	2021-08-19 08:57:48 +02:00
Frederik Ring	8e90ce408a	add note about potentially having to raise memory limit when backing up large files	2021-08-18 20:38:51 +02:00
Frederik Ring	510ae889e4	document AWS_ENDPOINT_PROTO option	2021-08-17 19:49:51 +02:00
Frederik Ring	e4bb183afa	add note about applying memory limit when running in swarm mode	2021-08-05 21:56:19 +02:00
Frederik Ring	5fd6f66324	label container in cli test	2021-07-11 20:21:17 +02:00
Frederik Ring	da75d232f4	add test for using docker cli	2021-07-11 14:02:05 +02:00
Frederik Ring	8a385d22aa	sleep longer before trying to backup	2021-07-11 10:39:39 +02:00
Frederik Ring	a3d7af2b42	add docs on manually triggering backup	2021-07-11 10:36:29 +02:00
Frederik Ring	c01555f052	check for correct file in tests	2021-07-11 10:30:16 +02:00
Frederik Ring	d29d0d7399	check for correct file in tests	2021-07-11 10:26:35 +02:00
Frederik Ring	a91353742d	add test for interacting with a swarm stack	2021-07-11 10:21:47 +02:00
Frederik Ring	dda71c3a5d	fix distinct service names ending up in joint service token	2021-07-10 08:09:55 +02:00
Frederik Ring	a8f013e16a	Merge pull request #8 from offen/some-tests Add integration test	2021-07-09 10:00:51 +02:00
Frederik Ring	44d65c1a67	assert that all containers are back up and running after backup	2021-07-09 09:57:05 +02:00
Frederik Ring	88d4326e61	define cron schedule that never runs	2021-07-09 09:50:59 +02:00
Frederik Ring	6d3e43680c	add basic integration test	2021-07-09 09:47:07 +02:00
Frederik Ring	6ce197696a	scaffold basic testing in CI	2021-07-09 08:15:27 +02:00
Frederik Ring	ac3a231d2b	Merge pull request #7 from offen/swarm-support Support Docker in Swarm mode	2021-07-08 20:07:06 +02:00
Frederik Ring	054ab8fbe6	when stopped container was part of a stack service, update service instead	2021-07-08 19:54:04 +02:00
Frederik Ring	fa356137e8	inject proper version for mc command at compile time	2021-07-03 10:25:26 +02:00
Frederik Ring	07befda44d	build mc from source, support arm/v7	2021-07-01 15:16:39 +02:00
Frederik Ring	c33ebc0c70	Merge pull request #5 from offen/multiarch Build image for arm architectures	2021-07-01 14:22:54 +02:00
Frederik Ring	23c287bfc7	build image for arm architectures	2021-07-01 14:19:55 +02:00
Frederik Ring	5be3c36040	update alpine base image to 3.14	2021-06-28 20:25:21 +02:00
Frederik Ring	57afad5727	Merge pull request #4 from offen/stop-label Allow for making container stop filter configurable	2021-06-26 21:19:35 +02:00
Frederik Ring	bafca7bb85	allow for making container stop filter configurable	2021-06-26 21:16:22 +02:00
Frederik Ring	84afc43fd8	Merge pull request #2 from offen/mc-extra-flags Allow passing custom arguments to minio client	2021-05-25 07:37:00 +02:00
Frederik Ring	1af345061c	use global options naming to be in line with minio docs	2021-05-25 07:35:21 +02:00
Frederik Ring	5368eb8c5e	allow passing custom arguments to minio client	2021-05-24 20:34:30 +02:00
Frederik Ring	5978a897ad	document leeway option when pruning	2021-04-08 17:24:44 +02:00
Frederik Ring	203bad3427	add missing sleep call	2021-04-08 08:27:21 +02:00