mirror of
https://github.com/offen/docker-volume-backup.git
synced 2024-11-22 05:10:28 +01:00
adapt repo layout to go
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parent
435583168b
commit
da9458724f
@ -5,8 +5,8 @@ FROM golang:1.17-alpine as builder
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WORKDIR /app
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COPY go.mod go.sum ./
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COPY src/main.go ./src/main.go
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RUN go build -o backup src/main.go
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COPY cmd/backup/main.go ./cmd/backup/main.go
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RUN go build -o backup cmd/backup/main.go
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FROM alpine:3.14
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@ -16,7 +16,7 @@ RUN apk add --update ca-certificates
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COPY --from=builder /app/backup /usr/bin/backup
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COPY src/entrypoint.sh /root/
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COPY ./entrypoint.sh /root/
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RUN chmod +x entrypoint.sh
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ENTRYPOINT ["/root/entrypoint.sh"]
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@ -1,3 +1,6 @@
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// Copyright 2021 - Offen Authors <hioffen@posteo.de>
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// SPDX-License-Identifier: MPL-2.0
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package main
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import (
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@ -28,7 +31,7 @@ import (
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)
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func main() {
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unlock, err := lock()
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unlock, err := lock("/var/dockervolumebackup.lock")
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if err != nil {
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panic(err)
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}
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@ -57,10 +60,9 @@ type script struct {
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archive string
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}
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// lock opens a lock file without releasing it and returns a function that
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// can be called once the lock shall be released again.
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func lock() (func() error, error) {
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lockfile := "/var/dockervolumebackup.lock"
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// lock opens a lockfile, keeping it open until the caller invokes the returned
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// release func.
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func lock(lockfile string) (func() error, error) {
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lf, err := os.OpenFile(lockfile, os.O_CREATE, os.ModeAppend)
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if err != nil {
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return nil, fmt.Errorf("lock: error opening lock file: %w", err)
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@ -316,7 +318,7 @@ func (s *script) cleanBackup() error {
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if err := os.Remove(s.file); err != nil {
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return fmt.Errorf("cleanBackup: error removing file: %w", err)
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}
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s.logger.Info("Successfully cleaned local backup.")
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s.logger.Info("Successfully cleaned up local artifacts.")
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return nil
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}
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@ -391,7 +393,7 @@ func (s *script) pruneOldBackups() error {
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} else if len(matches) != 0 && len(matches) == lenCandidates {
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s.logger.Warnf("The current configuration would delete all %d remote backups. Refusing to do so.", len(matches))
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} else {
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s.logger.Info("No remote backups were pruned.")
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s.logger.Infof("None of %d remote backups were pruned.", lenCandidates)
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}
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}
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@ -443,7 +445,7 @@ func (s *script) pruneOldBackups() error {
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} else if len(matches) != 0 && len(matches) == len(candidates) {
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s.logger.Warnf("The current configuration would delete all %d local backups. Refusing to do so.", len(matches))
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} else {
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s.logger.Info("No local backups were pruned.")
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s.logger.Infof("None of %d local backups were pruned.", len(candidates))
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}
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}
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return nil
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181
src/backup.sh
181
src/backup.sh
@ -1,181 +0,0 @@
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#!/bin/sh
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# Copyright 2021 - Offen Authors <hioffen@posteo.de>
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# SPDX-License-Identifier: MPL-2.0
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# Portions of this file are taken from github.com/futurice/docker-volume-backup
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# See NOTICE for information about authors and licensing.
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source env.sh
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function info {
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echo -e "\n[INFO] $1\n"
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}
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info "Preparing backup"
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DOCKER_SOCK="/var/run/docker.sock"
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if [ -S "$DOCKER_SOCK" ]; then
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TEMPFILE="$(mktemp)"
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docker ps -q \
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--filter "label=docker-volume-backup.stop-during-backup=$BACKUP_STOP_CONTAINER_LABEL" \
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> "$TEMPFILE"
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CONTAINERS_TO_STOP="$(cat $TEMPFILE | tr '\n' ' ')"
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CONTAINERS_TO_STOP_TOTAL="$(cat $TEMPFILE | wc -l)"
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CONTAINERS_TOTAL="$(docker ps -q | wc -l)"
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rm "$TEMPFILE"
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echo "$CONTAINERS_TOTAL containers running on host in total."
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echo "$CONTAINERS_TO_STOP_TOTAL containers marked to be stopped during backup."
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else
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CONTAINERS_TO_STOP_TOTAL="0"
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CONTAINERS_TOTAL="0"
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echo "Cannot access \"$DOCKER_SOCK\", won't look for containers to stop."
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fi
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if [ "$CONTAINERS_TO_STOP_TOTAL" != "0" ]; then
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info "Stopping containers"
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docker stop $CONTAINERS_TO_STOP
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fi
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info "Creating backup"
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BACKUP_FILENAME="$(date +"$BACKUP_FILENAME")"
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tar -czvf "$BACKUP_FILENAME" $BACKUP_SOURCES # allow the var to expand, in case we have multiple sources
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if [ ! -z "$GPG_PASSPHRASE" ]; then
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info "Encrypting backup"
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gpg --symmetric --cipher-algo aes256 --batch --passphrase "$GPG_PASSPHRASE" \
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-o "${BACKUP_FILENAME}.gpg" $BACKUP_FILENAME
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rm $BACKUP_FILENAME
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BACKUP_FILENAME="${BACKUP_FILENAME}.gpg"
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fi
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if [ "$CONTAINERS_TO_STOP_TOTAL" != "0" ]; then
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info "Starting containers/services back up"
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# The container might be part of a stack when running in swarm mode, so
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# its parent service needs to be restarted instead once backup is finished.
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SERVICES_REQUIRING_UPDATE=""
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for CONTAINER_ID in $CONTAINERS_TO_STOP; do
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SWARM_SERVICE_NAME=$(
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docker inspect \
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--format "{{ index .Config.Labels \"com.docker.swarm.service.name\" }}" \
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$CONTAINER_ID
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)
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if [ -z "$SWARM_SERVICE_NAME" ]; then
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echo "Restarting $(docker start $CONTAINER_ID)"
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else
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echo "Removing $(docker rm $CONTAINER_ID)"
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# Multiple containers might belong to the same service, so they will
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# be restarted only after all names are known.
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SERVICES_REQUIRING_UPDATE="${SERVICES_REQUIRING_UPDATE} ${SWARM_SERVICE_NAME}"
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fi
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done
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if [ -n "$SERVICES_REQUIRING_UPDATE" ]; then
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for SERVICE_NAME in $(echo -n "$SERVICES_REQUIRING_UPDATE" | tr ' ' '\n' | sort -u); do
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docker service update --force $SERVICE_NAME
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done
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fi
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fi
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copy_backup () {
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mc cp $MC_GLOBAL_OPTIONS "$BACKUP_FILENAME" "$1"
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}
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if [ ! -z "$AWS_S3_BUCKET_NAME" ]; then
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info "Uploading backup to remote storage"
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echo "Will upload to bucket \"$AWS_S3_BUCKET_NAME\"."
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copy_backup "backup-target/$AWS_S3_BUCKET_NAME"
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echo "Upload finished."
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fi
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if [ -d "$BACKUP_ARCHIVE" ]; then
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info "Copying backup to local archive"
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echo "Will copy to \"$BACKUP_ARCHIVE\"."
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copy_backup "$BACKUP_ARCHIVE"
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echo "Finished copying."
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fi
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if [ -f "$BACKUP_FILENAME" ]; then
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info "Cleaning up"
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rm -vf "$BACKUP_FILENAME"
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fi
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info "Backup finished"
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echo "Will wait for next scheduled backup."
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probe_expired () {
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local target=$1
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local is_local=$2
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if [ -z "$is_local" ]; then
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if [ ! -z "$BACKUP_PRUNING_PREFIX" ]; then
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target="${target}/${BACKUP_PRUNING_PREFIX}"
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fi
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mc rm $MC_GLOBAL_OPTIONS --fake --recursive --force \
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--older-than "${BACKUP_RETENTION_DAYS}d" \
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"$target"
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else
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find $target -name "${BACKUP_PRUNING_PREFIX:-*}" -type f -mtime "+${BACKUP_RETENTION_DAYS}"
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fi
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}
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probe_all () {
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local target=$1
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local is_local=$2
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if [ -z "$is_local" ]; then
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if [ ! -z "$BACKUP_PRUNING_PREFIX" ]; then
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target="${target}/${BACKUP_PRUNING_PREFIX}"
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fi
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mc ls $MC_GLOBAL_OPTIONS "$target"
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else
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find $target -name "${BACKUP_PRUNING_PREFIX:-*}" -type f
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fi
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}
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delete () {
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local target=$1
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local is_local=$2
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if [ -z "$is_local" ]; then
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if [ ! -z "$BACKUP_PRUNING_PREFIX" ]; then
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target="${target}/${BACKUP_PRUNING_PREFIX}"
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fi
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mc rm $MC_GLOBAL_OPTIONS --recursive --force \
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--older-than "${BACKUP_RETENTION_DAYS}d" \
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"$target"
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else
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find $target -name "${BACKUP_PRUNING_PREFIX:-*}" -type f -mtime "+${BACKUP_RETENTION_DAYS}" -delete
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fi
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}
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prune () {
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local target=$1
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local is_local=$2
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rule_applies_to=$(probe_expired "$target" "$is_local" | wc -l)
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if [ "$rule_applies_to" == "0" ]; then
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echo "No backups found older than the configured retention period of ${BACKUP_RETENTION_DAYS} days."
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echo "Doing nothing."
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else
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total=$(probe_all "$target" "$is_local" | wc -l)
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if [ "$rule_applies_to" == "$total" ]; then
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echo "Using a retention of ${BACKUP_RETENTION_DAYS} days would prune all currently existing backups, will not continue."
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echo "If this is what you want, please remove files manually instead of using this script."
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else
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delete "$target" "$is_local"
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echo "Successfully pruned ${rule_applies_to} backups older than ${BACKUP_RETENTION_DAYS} days."
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fi
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fi
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}
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if [ ! -z "$BACKUP_RETENTION_DAYS" ]; then
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info "Pruning old backups"
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echo "Sleeping ${BACKUP_PRUNING_LEEWAY} before checking eligibility."
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sleep "$BACKUP_PRUNING_LEEWAY"
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if [ ! -z "$AWS_S3_BUCKET_NAME" ]; then
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info "Pruning old backups from remote storage"
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prune "backup-target/$AWS_S3_BUCKET_NAME"
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fi
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if [ -d "$BACKUP_ARCHIVE" ]; then
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info "Pruning old backups from local archive"
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prune "$BACKUP_ARCHIVE" "local"
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fi
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fi
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