add zstd

[ksurl]

add support for zstd compression

[ksurl]

running tar manually in the container works but it fails when calling it from the docker cli. any ideas?

manual command:

tar -C /volume -I zstd -cf /backup/test.zstd ./

via container with local test image:
docker run --rm -v test:/volume:ro volume-backup:test backup -c zstd - > /folder/backup.zstd

via image would just print the usage text and exit

update: ignore the error. I was still using your image in my script, not the test image. it works fine. should be good to merge

[loomchild]

Thanks a lot for your contribution - I will test it and merge it in a few days (focusing now on FOSDEM / https://fosdem.sojourner.rocks/ 😅)

[ksurl]

any update on this?

[loomchild]

Not yet.

[loomchild]

Hi, it seems to work OK. I will merge it. (and add -zstd to the usage message). Thanks for your help and sorry for delay.