fix: avoid unneccesary temporary layout during build --oci (release-4.1) #3032
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With sylabs#2935 in place we can now translate a Docker archive tarball into an OCI-SIF without creating a redundant copy of the image as a temporary OCI layout. We've previously been processing the buildkit tarball as an oci-archive, which still requires extraction to a temporary layout, as ggcr's tarball package doesn't accept an archived layout without a manifest.json. Because the buildkit output tarball includes the Docker specific manifest.json, in addition to the standard OCI layout files, it can be treated as a docker-archive - now avoiding the need for the temporary layout. Significantly reduces disk space needed by `build --oci`, and the associated I/O. Fixes sylabs#2308
dtrudg
approved these changes
Jun 20, 2024
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cherry pick #2936
With #2935 in place we can now translate a Docker archive tarball into an OCI-SIF without creating a redundant copy of the image as a temporary OCI layout.
We've previously been processing the buildkit tarball as an oci-archive, which still requires extraction to a temporary layout, as ggcr's tarball package doesn't accept an archived layout without a manifest.json.
Because the buildkit output tarball includes the Docker specific manifest.json, in addition to the standard OCI layout files, it can be treated as a docker-archive - now avoiding the need for the temporary layout.
Significantly reduces disk space needed by
build --oci, and the associated I/O.Fixes #2308