erofs-differ: fix filesystem UUID for tar-converted layers #12046
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AkihiroSuda
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Jul 1, 2025
Derive filesystem UUIDs (`lsblk -o +UUID`) from the OCI layer digests
(although diffIDs are better in principle, but they're unavailable by
differs in advance) rather than generating a random one. This allows
EROFS to uniquely identify each layer using the content-addressable
filesystem UUID.
It can also be used for reproducible builds. To achieve this, configure
`mkfs_options` with `-T0 --mkfs-time` (However, `--mkfs-time` requires
erofs-utils 1.8+; Otherwise, all inode timestamps will be reset w/o it):
``` toml
[plugins."io.containerd.differ.v1.erofs"]
mkfs_options = ["-T0 --mkfs-time"]
```
Fixes: c73c8e5 ("Introduce EROFS differ")
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
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AkihiroSuda
approved these changes
Jul 2, 2025
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/cc @dmcgowan @fuweid @djdongjin @cpuguy83 |
cpuguy83
approved these changes
Jul 2, 2025
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/cherry-pick release/2.1 |
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@hsiangkao: new pull request created: #12058 DetailsIn response to this:
Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. |
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Derive filesystem UUIDs (
lsblk -o +UUID) from the OCI layer digests (although diffIDs are better in principle, but they're unavailable by differs in advance) rather than generating a random one.This allows EROFS to uniquely identify each layer using the content-addressable filesystem UUID.
Note: currently uuid.NewSHA1(uuid.NameSpaceURL, []byte("erofs:blobs/"+desc.Digest)) is used to generate filesystem UUIDs.