cache compression algorithm

[nicolaerosiaradcom]

Is there a way to specify how to compress the cached layers when doing buildah build, of course with --layers ?

It seems like the cache has MIMEType application/vnd.oci.image.layer.v1.tar+gzip

[flouthoc]

Can i understand what are you trying to do ? --layers are intermediate images which are stored on local host.

[nicolaerosiaradcom]

@flouthoc

I'm building the images in a CI and I would like to speed up things by using zstd cache. Cache gets created and reused just fine, however it seems to be compressed using gzip, even if I have something like this which causes the final images to be pushed (buildah push) with the right compression format.

tee "/etc/containers/containers.conf.d/myconf.conf" << EOF
[engine]
compression_format="zstd:chunked"
compression_level=3
EOF

buildah build \
  --timestamp=1742216986 \
  --cache-from ${NEXUS_REGISTRY}/cache \
  --cache-to ${NEXUS_REGISTRY}/cache \
  --cache-ttl=240h \
  --layers=true \
  --disable-compression=true \
[...]

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