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Fall back from partial pull when on VFS #2140

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merged 4 commits into from
Oct 21, 2024

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mtrmac
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@mtrmac mtrmac commented Oct 17, 2024

First refactor the logic a bit, to separate “are partial pulls allowed” from “set up partial pulls”.

See individual commits.

@giuseppe RFC on the logic, WRT composefs integrity enforcement.

Currently untested, that’s going to happen in containers/podman#24287 .

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mtrmac commented Oct 17, 2024

Possibly fixes containers/podman#24308 .

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mtrmac commented Oct 17, 2024

Confirming that this fixes the single reproducer in containers/podman#24308 .

@mtrmac mtrmac marked this pull request as ready for review October 18, 2024 00:17
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LGTM

return nil, errors.New("both zstd:chunked and eStargz TOC found")
}

// convertImages also serves as a “must not fallback to non-partial pull” option (?!)
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yes, for now at least it does. Because if that is set, we expect that every image is pulled using the partial pull code path, so that we can enforce composefs.

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rhatdan commented Oct 18, 2024

/lgtm

... to centralize the fallback allowed / required logic.

Should not change behavior, apart from maybe some error text.

Signed-off-by: Miloslav Trmač <[email protected]>
Instead of sharing the badRequestErr logic, duplicate it.
That's a bit ugly, but we get better debug messages and a more
traditional control flow.

Should not change behavior, except for debug messages.

Signed-off-by: Miloslav Trmač <[email protected]>
Use switch to handle the various TOC presence cases

Signed-off-by: Miloslav Trmač <[email protected]>
... and other graph drivers which don't support partial pulls.

Signed-off-by: Miloslav Trmač <[email protected]>
@openshift-ci openshift-ci bot removed the lgtm label Oct 18, 2024
mtrmac added a commit to mtrmac/libpod that referenced this pull request Oct 18, 2024
> go mod edit -replace github.com/containers/storage=github.com/mtrmac/storage@vfs-fallback

Signed-off-by: Miloslav Trmač <[email protected]>
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@vrothberg vrothberg left a comment

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LGTM
Merge at will.

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@giuseppe giuseppe left a comment

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/lgtm

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openshift-ci bot commented Oct 21, 2024

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: giuseppe, mtrmac, vrothberg

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  • OWNERS [giuseppe,mtrmac,vrothberg]

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@openshift-merge-bot openshift-merge-bot bot merged commit a42802e into containers:main Oct 21, 2024
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@mtrmac mtrmac deleted the vfs-fallback branch October 21, 2024 15:59
mtrmac added a commit to mtrmac/libpod that referenced this pull request Oct 22, 2024
mtrmac added a commit to mtrmac/libpod that referenced this pull request Oct 22, 2024
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4 participants