add initial source

src/backup.sh

@@ -0,0 +1,93 @@
+#!/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] $1\n"
+}
+
+info "Backup starting"
+DOCKER_SOCK="/var/run/docker.sock"
+
+if [ -S "$DOCKER_SOCK" ]; then
+  TEMPFILE="$(mktemp)"
+  docker ps \
+    --format "{{.ID}}" \
+    --filter "label=offen.stop-during-backup=true" \
+    > "$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"
+  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 [ "$rule_applies_to" == "0" ]; then
+    echo "No backups found that match the configured retention period. Doing nothing."
+    exit 0
+  fi
+
+  available=$(mc ls "backup-target/$bucket" | wc -l)
+
+  if [ "$rule_applies_to" == "$available" ]; 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 all backups older than ${BACKUP_RETENTION_DAYS} days"
+fi

src/entrypoint.sh

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+#!/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:-}"
+
+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