Also expand env vars in pruning prefix if configured

* reuse hook mechanism for scheduling clean up tasks

* register hooks before creating files or dirs

* fix logging order

* use typed hook levels

Dockerfile

@@ -5,6 +5,7 @@ FROM golang:1.17-alpine as builder
 
 WORKDIR /app
 COPY go.mod go.sum ./
+RUN go mod download
 COPY cmd/backup/main.go ./cmd/backup/main.go
 RUN go build -o backup cmd/backup/main.go
 

README.md

@@ -3,19 +3,24 @@
 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 lightweight (below 15MB) sidecar container to an existing Docker setup.
-It handles __recurring or one-off backups of Docker volumes__ to a __local directory__ or __any S3 compatible storage__ (or both), and __rotates away old backups__ if configured. It also supports __encrypting your backups using GPG__.
+It handles __recurring or one-off backups of Docker volumes__ to a __local directory__ or __any S3 compatible storage__ (or both), and __rotates away old backups__ if configured. It also supports __encrypting your backups using GPG__ and __sending notifications for failed backup runs__.
 
 <!-- MarkdownTOC -->
 
 - [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)
   - [Stopping containers during backup](#stopping-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)
   - [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)
 - [Recipes](#recipes)
   - [Backing up to AWS S3](#backing-up-to-aws-s3)
   - [Backing up to MinIO](#backing-up-to-minio)
@@ -37,6 +42,8 @@ Code and documentation for `v1` versions are found on [this branch][v1-branch].
 
 ## Quickstart
 
+### Recurring backups in a compose setup
+
 Add a `backup` service to your compose setup and mount the volumes you would like to see backed up:
 
 ```yml
@@ -55,6 +62,10 @@ 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 # see below for configuration reference
@@ -73,6 +84,22 @@ 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.
@@ -95,6 +122,28 @@ You can populate below template according to your requirements and use it as you
 
 # 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_TEMPLATE="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
@@ -109,6 +158,13 @@ You can populate below template according to your requirements and use it as you
 # 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
@@ -124,7 +180,8 @@ You can populate below template according to your requirements and use it as you
 
 # 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.
+# certificates for your remote storage backend. This can only be used
+# when AWS_ENDPOINT_PROTO is set to `https`.
 
 # AWS_ENDPOINT_INSECURE="true"
 
@@ -188,8 +245,62 @@ You can populate below template according to your requirements and use it as you
 # override this default by specifying a different value here.
 
 # BACKUP_STOP_CONTAINER_LABEL="service1"
+
+########### 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/
+# 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"
+
+########### 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
 
 ### Stopping containers during backup
@@ -247,6 +358,27 @@ 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/
+
+
 ### Encrypting your backup using GPG
 
 The image supports encrypting backups using GPG out of the box.
@@ -278,6 +410,27 @@ In case you need to restore a volume from a backup, the most straight forward pr
 
 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.
@@ -306,6 +459,26 @@ You can manually trigger a backup run outside of the defined cron schedule by ex
 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
+```
+
 ## Recipes
 
 This section lists configuration for some real-world use cases that you can mix and match according to your needs.
@@ -362,6 +535,9 @@ 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
@@ -499,7 +675,7 @@ volumes:
 
 ## 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` and requires additional tools, making it heavy.
 This version is roughly 1/25 in compressed size (it's ~12MB).
@@ -510,3 +686,5 @@ 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 failed backups are supported
+- IAM authentication through instance profiles is supported

cmd/backup/main.go

@@ -4,6 +4,7 @@
 package main
 
 import (
+	"bytes"
 	"context"
 	"errors"
 	"fmt"
@@ -11,9 +12,13 @@ import (
 	"os"
 	"path"
 	"path/filepath"
+	"sort"
 	"strings"
 	"time"
 
+	"github.com/containrrr/shoutrrr"
+	"github.com/containrrr/shoutrrr/pkg/router"
+	sTypes "github.com/containrrr/shoutrrr/pkg/types"
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/api/types/filters"
 	"github.com/docker/docker/api/types/swarm"
@@ -24,6 +29,7 @@ import (
 	"github.com/m90/targz"
 	"github.com/minio/minio-go/v7"
 	"github.com/minio/minio-go/v7/pkg/credentials"
+	"github.com/otiai10/copy"
 	"github.com/sirupsen/logrus"
 	"golang.org/x/crypto/openpgp"
 )
@@ -37,8 +43,32 @@ func main() {
 		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 {
 		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())
 		}()
@@ -50,9 +80,7 @@ func main() {
 
 	s.must(s.encryptBackup())
 	s.must(s.copyBackup())
-	s.must(s.removeArtifacts())
 	s.must(s.pruneOldBackups())
-	s.logger.Info("Finished running backup tasks.")
 }
 
 // script holds all the stateful information required to orchestrate a
@@ -61,9 +89,13 @@ type script struct {
 	cli       *client.Client
 	mc        *minio.Client
 	logger    *logrus.Logger
+	sender    *router.ServiceRouter
+	hooks     []hook
+	hookLevel hookLevel
 
 	start  time.Time
 	file   string
+	output *bytes.Buffer
 
 	c *config
 }
@@ -71,34 +103,50 @@ type script struct {
 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"`
 	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"`
 }
 
+var msgBackupFailed = "backup run failed"
+
 // 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:       os.Stdout,
+			Out:       stdOut,
 			Formatter: new(logrus.TextFormatter),
 			Hooks:     make(logrus.LevelHooks),
 			Level:     logrus.InfoLevel,
 		},
 		start:  time.Now(),
+		output: logBuffer,
 	}
 
 	if err := envconfig.Process("", s.c); err != nil {
@@ -106,6 +154,12 @@ func newScript() (*script, error) {
 	}
 
 	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.start, s.file)
 
 	_, err := os.Stat("/var/run/docker.sock")
 	if !os.IsNotExist(err) {
@@ -117,25 +171,139 @@ func newScript() (*script, error) {
 	}
 
 	if s.c.AwsS3BucketName != "" {
-		mc, err := minio.New(s.c.AwsEndpoint, &minio.Options{
+		var creds *credentials.Credentials
-			Creds: credentials.NewStaticV4(
+		if s.c.AwsAccessKeyID != "" && s.c.AwsSecretAccessKey != "" {
+			creds = credentials.NewStaticV4(
 				s.c.AwsAccessKeyID,
 				s.c.AwsSecretAccessKey,
 				"",
-			),
+			)
-			Secure: !s.c.AwsEndpointInsecure && s.c.AwsEndpointProto == "https",
+		} 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.mc = mc
 	}
 
+	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
+		// 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
 }
 
 var noop = func() error { return nil }
 
+// 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})
+}
+
+// notifyFailure sends a notification about a failed backup run
+func (s *script) notifyFailure(err error) error {
+	body := fmt.Sprintf(
+		"Running docker-volume-backup failed with error: %s\n\nLog output of the failed run was:\n\n%s\n", err, s.output.String(),
+	)
+	title := fmt.Sprintf("Failure running docker-volume-backup at %s", s.start.Format(time.RFC3339))
+	if err := s.sendNotification(title, body); err != nil {
+		return fmt.Errorf("notifyFailure: error notifying: %w", err)
+	}
+	return nil
+}
+
+// notifyFailure sends a notification about a successful backup run
+func (s *script) notifySuccess() error {
+	title := fmt.Sprintf("Success running docker-volume-backup at %s", s.start.Format(time.RFC3339))
+	body := fmt.Sprintf(
+		"Running docker-volume-backup succeeded.\n\nLog output was:\n\n%s\n", s.output.String(),
+	)
+	if err := s.sendNotification(title, body); err != nil {
+		return fmt.Errorf("notifySuccess: error notifying: %w", err)
+	}
+	return 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
+}
+
 // 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.
@@ -225,11 +393,10 @@ func (s *script) stopContainers() (func() error, error) {
 					return fmt.Errorf("stopContainersAndRun: couldn't find service with name %s", serviceName)
 				}
 				serviceMatch.Spec.TaskTemplate.ForceUpdate = 1
-				_, err := s.cli.ServiceUpdate(
+				if _, err := s.cli.ServiceUpdate(
 					context.Background(), serviceMatch.ID,
 					serviceMatch.Version, serviceMatch.Spec, types.ServiceUpdateOptions{},
-				)
+				); err != nil {
-				if err != nil {
 					restartErrors = append(restartErrors, err)
 				}
 			}
@@ -253,11 +420,40 @@ func (s *script) stopContainers() (func() error, error) {
 // takeBackup creates a tar archive of the configured backup location and
 // saves it to disk.
 func (s *script) takeBackup() error {
-	s.file = timeutil.Strftime(&s.start, s.file)
+	backupSources := s.c.BackupSources
-	if err := targz.Compress(s.c.BackupSources, s.file); err != nil {
+
+	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 := targz.Compress(backupSources, tarFile); err != nil {
 		return fmt.Errorf("takeBackup: error compressing backup folder: %w", err)
 	}
-	s.logger.Infof("Created backup of `%s` at `%s`.", s.c.BackupSources, s.file)
+
+	s.logger.Infof("Created backup of `%s` at `%s`.", backupSources, tarFile)
 	return nil
 }
 
@@ -268,9 +464,16 @@ func (s *script) encryptBackup() error {
 	if s.c.GpgPassphrase == "" {
 		return nil
 	}
-	defer os.Remove(s.file)
 
 	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 {
@@ -289,7 +492,7 @@ func (s *script) encryptBackup() error {
 
 	src, err := os.Open(s.file)
 	if err != nil {
-		return fmt.Errorf("encryptBackup: error opening backup file %s: %w", s.file, err)
+		return fmt.Errorf("encryptBackup: error opening backup file `%s`: %w", s.file, err)
 	}
 
 	if _, err := io.Copy(dst, src); err != nil {
@@ -306,30 +509,30 @@ func (s *script) encryptBackup() error {
 func (s *script) copyBackup() error {
 	_, name := path.Split(s.file)
 	if s.mc != nil {
-		_, err := s.mc.FPutObject(context.Background(), s.c.AwsS3BucketName, name, s.file, minio.PutObjectOptions{
+		if _, err := s.mc.FPutObject(context.Background(), s.c.AwsS3BucketName, name, s.file, minio.PutObjectOptions{
 			ContentType: "application/tar+gzip",
-		})
+		}); err != nil {
-		if 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 _, err := os.Stat(s.c.BackupArchive); !os.IsNotExist(err) {
-		if err := copy(s.file, path.Join(s.c.BackupArchive, name)); err != nil {
+		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
-}
-
-// removeArtifacts removes the backup file from disk.
-func (s *script) removeArtifacts() error {
-	if err := os.Remove(s.file); err != nil {
-		return fmt.Errorf("removeArtifacts: error removing file: %w", err)
 	}
-	s.logger.Info("Removed local artifacts.")
 	return nil
 }
 
@@ -410,15 +613,35 @@ func (s *script) pruneOldBackups() error {
 	}
 
 	if _, err := os.Stat(s.c.BackupArchive); !os.IsNotExist(err) {
-		candidates, err := filepath.Glob(
+		globPattern := path.Join(
-			path.Join(s.c.BackupArchive, fmt.Sprintf("%s*", s.c.BackupPruningPrefix)),
+			s.c.BackupArchive,
+			fmt.Sprintf("%s*", s.c.BackupPruningPrefix),
 		)
+		globMatches, err := filepath.Glob(globPattern)
 		if err != nil {
 			return fmt.Errorf(
-				"pruneOldBackups: error looking up matching files, starting with: %w", err,
+				"pruneOldBackups: 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(
+					"pruneOldBackups: 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)
@@ -429,7 +652,6 @@ func (s *script) pruneOldBackups() error {
 					err,
 				)
 			}
-
 			if fi.ModTime().Before(deadline) {
 				matches = append(matches, candidate)
 			}
@@ -437,8 +659,8 @@ func (s *script) pruneOldBackups() error {
 
 		if len(matches) != 0 && len(matches) != len(candidates) {
 			var removeErrors []error
-			for _, candidate := range matches {
+			for _, match := range matches {
-				if err := os.Remove(candidate); err != nil {
+				if err := os.Remove(match); err != nil {
 					removeErrors = append(removeErrors, err)
 				}
 			}
@@ -468,14 +690,57 @@ func (s *script) pruneOldBackups() error {
 	return nil
 }
 
-// must exits the script run non-zero and prematurely in case the given error
+// 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
+}
+
+// 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.Fatalf("Fatal error running backup: %s", err)
+		s.logger.Errorf("Fatal error running backup: %s", err)
+		panic(err)
 	}
 }
 
+// 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
+}
+
 // 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.
@@ -492,7 +757,7 @@ func lock(lockfile string) func() error {
 }
 
 // copy creates a copy of the file located at `dst` at `src`.
-func copy(src, dst string) error {
+func copyFile(src, dst string) error {
 	in, err := os.Open(src)
 	if err != nil {
 		return err
@@ -526,3 +791,42 @@ func join(errs ...error) error {
 	}
 	return errors.New("[" + strings.Join(msgs, ", ") + "]")
 }
+
+// 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)
+}
+
+// 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,
+}

go.mod

@@ -3,12 +3,14 @@ module github.com/offen/docker-volume-backup
 go 1.17
 
 require (
-	github.com/docker/docker v20.10.8+incompatible
+	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/m90/targz v0.0.0-20210904082215-2e9a4529a615
-	github.com/minio/minio-go/v7 v7.0.12
+	github.com/minio/minio-go/v7 v7.0.16
+	github.com/otiai10/copy v1.7.0
 	github.com/sirupsen/logrus v1.8.1
 	golang.org/x/crypto v0.0.0-20210817164053-32db794688a5
 )
@@ -20,26 +22,37 @@ require (
 	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 v1.2.0 // indirect
+	github.com/google/uuid v1.3.0 // indirect
-	github.com/json-iterator/go v1.1.10 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
-	github.com/klauspost/cpuid v1.3.1 // indirect
+	github.com/klauspost/compress v1.13.6 // indirect
-	github.com/minio/md5-simd v1.1.0 // indirect
+	github.com/klauspost/cpuid/v2 v2.0.9 // indirect
-	github.com/minio/sha256-simd v0.1.1 // 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 v1.0.1 // 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 v1.2.1 // 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 v0.3.4 // 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 v1.57.0 // 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
 )

go.sum

@@ -61,6 +61,7 @@ github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAE
 github.com/PuerkitoBio/purell v1.1.1/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
 github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
 github.com/Shopify/logrus-bugsnag v0.0.0-20171204204709-577dee27f20d/go.mod h1:HI8ITrYtUY+O+ZhtlqUnD8+KwNPOyugEhfP9fdUIaEQ=
+github.com/agnivade/wasmbrowsertest v0.3.1/go.mod h1:zQt6ZTdl338xxRaMW395qccVE2eQm0SjC/SDz0mPWQI=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
@@ -89,6 +90,12 @@ github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghf
 github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/checkpoint-restore/go-criu/v4 v4.1.0/go.mod h1:xUQBLp4RLc5zJtWY++yjOoMoB5lihDt7fai+75m+rGw=
 github.com/checkpoint-restore/go-criu/v5 v5.0.0/go.mod h1:cfwC0EG7HMUenopBsUf9d89JlCLQIfgVcNsNN0t6T2M=
+github.com/chromedp/cdproto v0.0.0-20190614062957-d6d2f92b486d/go.mod h1:S8mB5wY3vV+vRIzf39xDXsw3XKYewW9X6rW2aEmkrSw=
+github.com/chromedp/cdproto v0.0.0-20190621002710-8cbd498dd7a0/go.mod h1:S8mB5wY3vV+vRIzf39xDXsw3XKYewW9X6rW2aEmkrSw=
+github.com/chromedp/cdproto v0.0.0-20190812224334-39ef923dcb8d/go.mod h1:0YChpVzuLJC5CPr+x3xkHN6Z8KOSXjNbL7qV8Wc4GW0=
+github.com/chromedp/cdproto v0.0.0-20190926234355-1b4886c6fad6/go.mod h1:0YChpVzuLJC5CPr+x3xkHN6Z8KOSXjNbL7qV8Wc4GW0=
+github.com/chromedp/chromedp v0.3.1-0.20190619195644-fd957a4d2901/go.mod h1:mJdvfrVn594N9tfiPecUidF6W5jPRKHymqHfzbobPsM=
+github.com/chromedp/chromedp v0.4.0/go.mod h1:DC3QUn4mJ24dwjcaGQLoZrhm4X/uPHZ6spDbS2uFhm4=
 github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
 github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
 github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
@@ -183,8 +190,11 @@ github.com/containernetworking/plugins v0.9.1/go.mod h1:xP/idU2ldlzN6m4p5LmGiwRD
 github.com/containers/ocicrypt v1.0.1/go.mod h1:MeJDzk1RJHv89LjsH0Sp5KTY3ZYkjXO/C+bKAeWFIrc=
 github.com/containers/ocicrypt v1.1.0/go.mod h1:b8AOe0YR67uU8OqfVNcznfFpAzu3rdgUV4GP9qXPfu4=
 github.com/containers/ocicrypt v1.1.1/go.mod h1:Dm55fwWm1YZAjYRaJ94z2mfZikIyIN4B0oB3dj3jFxY=
+github.com/containrrr/shoutrrr v0.5.2 h1:97P+wZDpN2gzBKLt4PDP1ZUTLz+k8AJVs40WOu9NNw8=
+github.com/containrrr/shoutrrr v0.5.2/go.mod h1:XSU8tOIZ1JG8m6OuPozfGLpj6Ed+S8ZrRJaEodQhbzw=
 github.com/coreos/bbolt v1.3.2/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
 github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
+github.com/coreos/etcd v3.3.13+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
 github.com/coreos/go-iptables v0.4.5/go.mod h1:/mVI274lEDI2ns62jHCDnCyBF9Iwsmekav8Dbxlm1MU=
 github.com/coreos/go-iptables v0.5.0/go.mod h1:/mVI274lEDI2ns62jHCDnCyBF9Iwsmekav8Dbxlm1MU=
 github.com/coreos/go-oidc v2.1.0+incompatible/go.mod h1:CgnwVTmzoESiwO9qyAFEMiHoZ1nMCKZlZ9V6mm3/LKc=
@@ -218,8 +228,8 @@ github.com/docker/distribution v0.0.0-20190905152932-14b96e55d84c/go.mod h1:0+TT
 github.com/docker/distribution v2.7.1-0.20190205005809-0d3efadf0154+incompatible/go.mod h1:J2gT2udsDAN96Uj4KfcMRqY0/ypR+oyYUYmja8H+y+w=
 github.com/docker/distribution v2.7.1+incompatible h1:a5mlkVzth6W5A4fOsS3D2EO5BUmsJpcB+cRlLU7cSug=
 github.com/docker/distribution v2.7.1+incompatible/go.mod h1:J2gT2udsDAN96Uj4KfcMRqY0/ypR+oyYUYmja8H+y+w=
-github.com/docker/docker v20.10.8+incompatible h1:RVqD337BgQicVCzYrrlhLDWhq6OAD2PJDUg2LsEUvKM=
+github.com/docker/docker v20.10.11+incompatible h1:OqzI/g/W54LczvhnccGqniFoQghHx3pklbLuhfXpqGo=
-github.com/docker/docker v20.10.8+incompatible/go.mod h1:eEKB0N0r5NX/I1kEveEz05bcu8tLC/8azJZsviup8Sk=
+github.com/docker/docker v20.10.11+incompatible/go.mod h1:eEKB0N0r5NX/I1kEveEz05bcu8tLC/8azJZsviup8Sk=
 github.com/docker/go-connections v0.4.0 h1:El9xVISelRB7BuFusrZozjnkIM5YnzCViNKohAFqRJQ=
 github.com/docker/go-connections v0.4.0/go.mod h1:Gbd7IOopHjR8Iph03tsViu4nIes5XhDvyHbTtUxmeec=
 github.com/docker/go-events v0.0.0-20170721190031-9461782956ad/go.mod h1:Uw6UezgYA44ePAFQYUehOuCzmy5zmg/+nl2ZfMWGkpA=
@@ -234,6 +244,7 @@ github.com/docopt/docopt-go v0.0.0-20180111231733-ee0de3bc6815/go.mod h1:WwZ+bS3
 github.com/dustin/go-humanize v0.0.0-20171111073723-bb3d318650d4/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
 github.com/dustin/go-humanize v1.0.0 h1:VSnTsYCnlFHaM2/igO1h6X3HA71jcobQuxemgkq4zYo=
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@@ -242,19 +253,27 @@ github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.m
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@@ -268,7 +287,14 @@ github.com/go-openapi/jsonreference v0.19.3/go.mod h1:rjx6GuL8TTa9VaixXglHmQmIL9
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@@ -329,6 +355,7 @@ github.com/google/gofuzz v1.1.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/
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@@ -336,18 +363,20 @@ github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm4
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@@ -407,30 +449,45 @@ github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
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 github.com/stefanberger/go-pkcs11uri v0.0.0-20201008174630-78d3cae3a980/go.mod h1:AO3tvPzVZ/ayst6UlUKUv6rcPQInYe3IknH3jYhAKu8=
 github.com/stretchr/objx v0.0.0-20180129172003-8a3f7159479f/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
@@ -581,13 +659,17 @@ github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UV
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 github.com/urfave/cli v0.0.0-20171014202726-7bc6a0acffa5/go.mod h1:70zkFmudgCuE/ngEzBv17Jvp/497gISqfk5gWijbERA=
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@@ -610,6 +692,7 @@ github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9dec
 github.com/yvasiyarov/go-metrics v0.0.0-20140926110328-57bccd1ccd43/go.mod h1:aX5oPXxHm3bOH+xeAttToC8pqch2ScQN/JoXYupl6xs=
 github.com/yvasiyarov/gorelic v0.0.0-20141212073537-a9bba5b9ab50/go.mod h1:NUSPSUX/bi6SeDMUh6brw0nXpxHnc96TguQh0+r/ssA=
 github.com/yvasiyarov/newrelic_platform_go v0.0.0-20140908184405-b21fdbd4370f/go.mod h1:GlGEuHIJweS1mbCqG+7vt2nvWLzLLnRHbXz5JKd/Qbg=
+go.coder.com/go-tools v0.0.0-20190317003359-0c6a35b74a16/go.mod h1:iKV5yK9t+J5nG9O3uF6KYdPEz3dyfMyB15MN1rbQ8Qw=
 go.etcd.io/bbolt v1.3.2/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
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@@ -624,6 +707,7 @@ go.uber.org/atomic v1.4.0/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
 go.uber.org/multierr v1.1.0/go.mod h1:wR5kodmAFQ0UK8QlbwjlSNy0Z68gJhDJUG5sjR94q/0=
 go.uber.org/zap v1.10.0/go.mod h1:vwi/ZaCAaUcBkycHslxD9B2zi4UTXhF60s6SWpuDF0Q=
 golang.org/x/crypto v0.0.0-20171113213409-9f005a07e0d3/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
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 golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20181009213950-7c1a557ab941/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
@@ -673,6 +757,7 @@ golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73r
 golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
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+golang.org/x/net v0.0.0-20181102091132-c10e9556a7bc/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
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@@ -697,6 +782,7 @@ golang.org/x/net v0.0.0-20200222125558-5a598a2470a0/go.mod h1:z5CRVTTTmAJ677TzLL
 golang.org/x/net v0.0.0-20200226121028-0de0cce0169b/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
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@@ -724,6 +810,8 @@ golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5h
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@@ -735,13 +823,17 @@ golang.org/x/sys v0.0.0-20190602015325-4c4f7f33c9ed/go.mod h1:h1NjWce9XRLGQEsW7w
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@@ -753,6 +845,7 @@ golang.org/x/sys v0.0.0-20191210023423-ac6580df4449/go.mod h1:h1NjWce9XRLGQEsW7w
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@@ -762,6 +855,7 @@ golang.org/x/sys v0.0.0-20200217220822-9197077df867/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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+golang.org/x/sys v0.0.0-20200519105757-fe76b779f299/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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@@ -776,6 +870,7 @@ golang.org/x/sys v0.0.0-20201117170446-d9b008d0a637/go.mod h1:h1NjWce9XRLGQEsW7w
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+golang.org/x/sys v0.0.0-20210113181707-4bcb84eeeb78/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210324051608-47abb6519492/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210426230700-d19ff857e887/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -788,8 +883,9 @@ golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.3.4 h1:0YWbFKbhXG/wIiuHDSKpS0Iy7FSA+u45VtBMfQcFTTc=
 golang.org/x/text v0.3.4/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.6 h1:aRYxNxv6iGQlyVaZmk6ZgYEDa+Jg18DxebPSrd6bg1M=
+golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/time v0.0.0-20180412165947-fbb02b2291d2/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
@@ -815,6 +911,7 @@ golang.org/x/tools v0.0.0-20190624222133-a101b041ded4/go.mod h1:/rFqwRUd4F7ZHNgw
 golang.org/x/tools v0.0.0-20190628153133-6cdbf07be9d0/go.mod h1:/rFqwRUd4F7ZHNgwSSTFct+R/Kf4OFW1sUzUTQQTgfc=
 golang.org/x/tools v0.0.0-20190816200558-6889da9d5479/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20190911174233-4f2ddba30aff/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.0.0-20190920225731-5eefd052ad72/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20191012152004-8de300cfc20a/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20191113191852-77e3bb0ad9e7/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20191115202509-3a792d9c32b2/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
@@ -918,13 +1015,17 @@ gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
 gopkg.in/gemnasium/logrus-airbrake-hook.v2 v2.1.2/go.mod h1:Xk6kEKp8OKb+X14hQBKWaSkCsqBpgog8nAV2xsGOxlo=
 gopkg.in/inf.v0 v0.9.1/go.mod h1:cWUDdTG/fYaXco+Dcufb5Vnc6Gp2YChqWtbxRZE0mXw=
-gopkg.in/ini.v1 v1.57.0 h1:9unxIsFcTt4I55uWluz+UmL95q4kdJ0buvQ1ZIqVQww=
+gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/ini.v1 v1.55.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/ini.v1 v1.57.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/ini.v1 v1.65.0 h1:B2//IEITFk89S+Nl2tozBeqUvFEpUAY6daarSlrx8jU=
+gopkg.in/ini.v1 v1.65.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/natefinch/lumberjack.v2 v2.0.0/go.mod h1:l0ndWWf7gzL7RNwBG7wST/UCcT4T24xpD6X8LsfU/+k=
 gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
 gopkg.in/square/go-jose.v2 v2.2.2/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
 gopkg.in/square/go-jose.v2 v2.3.1/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
 gopkg.in/square/go-jose.v2 v2.5.1/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
 gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
@@ -933,11 +1034,15 @@ gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gosrc.io/xmpp v0.5.1/go.mod h1:L3NFMqYOxyLz3JGmgFyWf7r9htE91zVGiK40oW4RwdY=
+gotest.tools v2.1.0+incompatible/go.mod h1:DsYFclhRJ6vuDpmuTbkuFWG+y2sxOXAzmJt81HFBacw=
 gotest.tools v2.2.0+incompatible h1:VsBPFP1AI068pPrMxtb/S8Zkgf9xEmTLJjfM+P5UIEo=
 gotest.tools v2.2.0+incompatible/go.mod h1:DsYFclhRJ6vuDpmuTbkuFWG+y2sxOXAzmJt81HFBacw=
+gotest.tools/gotestsum v0.3.5/go.mod h1:Mnf3e5FUzXbkCfynWBGOwLssY7gTQgCHObK9tMpAriY=
 gotest.tools/v3 v3.0.2/go.mod h1:3SzNCllyD9/Y+b5r9JIKQ474KzkZyqLqEfYqMsX94Bk=
 gotest.tools/v3 v3.0.3 h1:4AuOwCGf4lLR9u3YOe2awrHygurzhO/HeQ6laiA6Sx0=
 gotest.tools/v3 v3.0.3/go.mod h1:Z7Lb0S5l+klDB31fvDQX8ss/FlKDxtlFlw3Oa8Ymbl8=
@@ -972,6 +1077,9 @@ k8s.io/klog/v2 v2.4.0/go.mod h1:Od+F08eJP+W3HUb4pSrPpgp9DGU4GzlpG/TmITuYh/Y=
 k8s.io/kube-openapi v0.0.0-20201113171705-d219536bb9fd/go.mod h1:WOJ3KddDSol4tAGcJo0Tvi+dK12EcqSLqcWsryKMpfM=
 k8s.io/kubernetes v1.13.0/go.mod h1:ocZa8+6APFNC2tX1DZASIbocyYT5jHzqFVsY5aoB7Jk=
 k8s.io/utils v0.0.0-20201110183641-67b214c5f920/go.mod h1:jPW/WVKK9YHAvNhRxK0md/EJ228hCsBRufyofKtW8HA=
+mvdan.cc/sh v2.6.4+incompatible/go.mod h1:IeeQbZq+x2SUGBensq/jge5lLQbS3XT2ktyp3wrt4x8=
+nhooyr.io/websocket v1.6.5/go.mod h1:F259lAzPRAH0htX2y3ehpJe09ih1aSHN7udWki1defY=
+nhooyr.io/websocket v1.8.6/go.mod h1:B70DZP8IakI65RVQ51MsWP/8jndNma26DVA/nFSCgW0=
 rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
 rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
 rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=

test/cli/run.sh

@@ -23,14 +23,12 @@ docker exec minio mkdir -p /data/backup
 docker run -d \
   --name offen \
   --network test_network \
-  --label "docker-volume-backup.stop-during-backup=true" \
   -v app_data:/var/opt/offen/ \
   offen/offen:latest
 
 sleep 10
 
-docker run -d \
+docker run --rm \
-  --name backup \
   --network test_network \
   -v app_data:/backup/app_data \
   -v /var/run/docker.sock:/var/run/docker.sock \
@@ -40,18 +38,17 @@ docker run -d \
   --env AWS_ENDPOINT_PROTO=http \
   --env AWS_S3_BUCKET_NAME=backup \
   --env BACKUP_FILENAME=test.tar.gz \
-  --env BACKUP_CRON_EXPRESSION="0 0 5 31 2 ?" \
+  --env "BACKUP_FROM_SNAPSHOT=true" \
+  --entrypoint backup \
   offen/docker-volume-backup:$TEST_VERSION
 
-docker exec backup backup
-
 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'
 
 echo "[TEST:PASS] Found relevant files in untared backup."
 
-if [ "$(docker ps -q | wc -l)" != "3" ]; then
+if [ "$(docker ps -q | wc -l)" != "2" ]; then
   echo "[TEST:FAIL] Expected all containers to be running post backup, instead seen:"
   docker ps
   exit 1
@@ -59,6 +56,6 @@ fi
 
 echo "[TEST:PASS] All containers running post backup."
 
-docker rm $(docker stop minio offen backup)
+docker rm $(docker stop minio offen)
 docker volume rm backup_data app_data
 docker network rm test_network

test/compose/docker-compose.yml

@@ -14,6 +14,7 @@ services:
 
   backup: &default_backup_service
     image: offen/docker-volume-backup:${TEST_VERSION}
+    hostname: hostnametoken
     depends_on:
       - minio
     restart: always
@@ -23,7 +24,9 @@ services:
       AWS_ENDPOINT: minio:9000
       AWS_ENDPOINT_PROTO: http
       AWS_S3_BUCKET_NAME: backup
-      BACKUP_FILENAME: test.tar.gz
+      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

test/compose/run.sh

@@ -14,11 +14,12 @@ docker-compose exec backup backup
 
 docker run --rm -it \
   -v compose_backup_data:/data alpine \
-  ash -c 'apk add gnupg && echo 1234secret | gpg -d --pinentry-mode loopback --passphrase-fd 0 --yes /data/backup/test.tar.gz.gpg > /tmp/test.tar.gz && tar -xf /tmp/test.tar.gz -C /tmp && test -f /tmp/backup/app_data/offen.db'
+  ash -c 'apk add gnupg && echo 1234secret | gpg -d --pinentry-mode loopback --passphrase-fd 0 --yes /data/backup/test-hostnametoken.tar.gz.gpg > /tmp/test-hostnametoken.tar.gz && tar -xf /tmp/test-hostnametoken.tar.gz -C /tmp && test -f /tmp/backup/app_data/offen.db'
 
 echo "[TEST:PASS] Found relevant files in untared remote backup."
 
-echo 1234secret | gpg -d --yes --passphrase-fd 0 ./local/test.tar.gz.gpg > ./local/decrypted.tar.gz
+test -L ./local/test-hostnametoken.latest.tar.gz.gpg
+echo 1234secret | gpg -d --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