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feat(raw-unpack): Add --start-from-digest flag #675

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feat(raw-unpack): Add --start-from-digest flag #675

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18 changes: 18 additions & 0 deletions cmd/umoci/raw-unpack.go
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Original file line number Diff line number Diff line change
Expand Up @@ -52,6 +52,11 @@ is the destination to unpack the image to.`,
Name: "keep-dirlinks",
Usage: "don't clobber underlying symlinks to directories",
},
cli.StringFlag{
Name: "start-from-digest",
Usage: "start unpacking from the given layer digest",
Value: "",
},
},

Action: rawUnpack,
Expand Down Expand Up @@ -134,6 +139,19 @@ func rawUnpack(ctx *cli.Context) (Err error) {
return fmt.Errorf("[internal error] unknown manifest blob type: %s", manifestBlob.Descriptor.MediaType)
}

startFromDigest := ctx.String("start-from-digest")
if startFromDigest != "" {
for _, layer := range manifest.Layers {
if layer.Digest.String() == startFromDigest {
unpackOptions.StartFrom = layer
break
}
}
if unpackOptions.StartFrom.MediaType == "" {
return fmt.Errorf("start-from-digest: %s not found in manifest", startFromDigest)
}
}

log.Warnf("unpacking rootfs ...")
if err := layer.UnpackRootfs(context.Background(), engineExt, rootfsPath, manifest, &unpackOptions); err != nil {
return fmt.Errorf("create rootfs: %w", err)
Expand Down
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