Pass file location to lifecycle commands (#173)

* Add test case for extending image and calling through to rsync

* Keep backup file location env var

* Add documentation

* Work against untared content in test
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Frederik Ring 2022-12-30 16:07:34 +01:00 committed by GitHub
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commit 63961cd826
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@ -33,6 +33,7 @@ It handles __recurring or one-off backups of Docker volumes__ to a __local direc
- [Run multiple backup schedules in the same container](#run-multiple-backup-schedules-in-the-same-container)
- [Define different retention schedules](#define-different-retention-schedules)
- [Use special characters in notification URLs](#use-special-characters-in-notification-urls)
- [Handle file uploads using third party tools](#handle-file-uploads-using-third-party-tools)
- [Recipes](#recipes)
- [Backing up to AWS S3](#backing-up-to-aws-s3)
- [Backing up to Filebase](#backing-up-to-filebase)
@ -894,6 +895,45 @@ where service is any of the [supported services][shoutrrr-docs], e.g. for SMTP:
docker run --rm -ti containrrr/shoutrrr generate smtp
```
### Handle file uploads using third party tools
If you want to use a non-supported storage backend, or want to use a third party (e.g. rsync, rclone) tool for file uploads, you can build a Docker image containing the required binaries off this one, and call through to these in lifecycle hooks.
For example, if you wanted to use `rsync`, define your Docker image like this:
```Dockerfile
ARG version=canary
FROM offen/docker-volume-backup:$version
RUN apk add rsync
```
Using this image, you can now omit configuring any of the supported storage backends, and instead define your own mechanism in a `docker-volume-backup.copy-post` label:
```yml
version: '3'
services:
backup:
image: your-custom-image
restart: always
environment:
BACKUP_FILENAME: "daily-backup-%Y-%m-%dT%H-%M-%S.tar.gz"
BACKUP_CRON_EXPRESSION: "0 2 * * *"
labels:
- docker-volume-backup.copy-post=/bin/sh -c 'rsync $$COMMAND_RUNTIME_ARCHIVE_FILEPATH /destination'
volumes:
- app_data:/backup/app_data:ro
- /var/run/docker.sock:/var/run/docker.sock
# other services defined here ...
volumes:
app_data:
```
Commands will be invoked with the filepath of the tar archive passed as `COMMAND_RUNTIME_BACKUP_FILEPATH`.
## Recipes
This section lists configuration for some real-world use cases that you can mix and match according to your needs.

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@ -23,10 +23,14 @@ import (
func (s *script) exec(containerRef string, command string) ([]byte, []byte, error) {
args, _ := argv.Argv(command, nil, nil)
commandEnv := []string{
fmt.Sprintf("COMMAND_RUNTIME_ARCHIVE_FILEPATH=%s", s.file),
}
execID, err := s.cli.ContainerExecCreate(context.Background(), containerRef, types.ExecConfig{
Cmd: args[0],
AttachStdin: true,
AttachStderr: true,
Env: commandEnv,
})
if err != nil {
return nil, nil, fmt.Errorf("exec: error creating container exec: %w", err)

4
test/extend/Dockerfile Normal file
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@ -0,0 +1,4 @@
ARG version=canary
FROM offen/docker-volume-backup:$version
RUN apk add rsync

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@ -0,0 +1,26 @@
version: '3'
services:
backup:
image: offen/docker-volume-backup:${TEST_VERSION:-canary}
restart: always
labels:
- docker-volume-backup.copy-post=/bin/sh -c 'mkdir -p /tmp/unpack && tar -xvf $$COMMAND_RUNTIME_ARCHIVE_FILEPATH -C /tmp/unpack && rsync -r /tmp/unpack/backup/app_data /local'
environment:
BACKUP_FILENAME: test.tar.gz
BACKUP_CRON_EXPRESSION: 0 0 5 31 2 ?
EXEC_FORWARD_OUTPUT: "true"
volumes:
- ./local:/local
- 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:
app_data:

28
test/extend/run.sh Normal file
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@ -0,0 +1,28 @@
#!/bin/sh
set -e
cd "$(dirname "$0")"
. ../util.sh
current_test=$(basename $(pwd))
mkdir -p local
export TEST_VERSION="${TEST_VERSION:-canary}-with-rsync"
docker build . -t offen/docker-volume-backup:$TEST_VERSION
docker-compose up -d
sleep 5
docker-compose exec backup backup
sleep 5
expect_running_containers "2"
if [ ! -f "./local/app_data/offen.db" ]; then
fail "Could not find expected file in untared archive."
fi
docker-compose down --volumes