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stages/oci-archive: write history entries

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According to the OCI Image Format Specification[1] history entries
for layers in the container are optional; but when trying to push
a container quay.io via skopeo (copy oci-archive:… docker://quay)
it will fail with "Cannot convert an image with 0 history entries".
This seems to come from the containers/image[2] library when the
container is converted back from the docker distribution format
to oci-archive on quay.io. Thus it seems that when skopeo converts
the image to the docker format for the distribution it does not
fill any the history entries, which are then assumed and required
to be there when converting back.
To fix this, insert history entries for each layer that is created.

[1] https://github.com/opencontainers/image-spec/blob/master/config.md
[2] https://github.com/containers/image/
This commit is contained in:
Christian Kellner 2021-03-29 12:08:13 +02:00 • committed by Tom Gundersen
parent 8429b08e79
commit d37bf0375b
1 changed files with 10 additions and 3 deletions
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13
stages/org.osbuild.oci-archive
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@ -230,15 +230,18 @@ def config_from_options(options):
def create_oci_dir(inputs, output_dir, options):
architecture = options["architecture"]
now = datetime.datetime.utcnow().isoformat() + "Z"
config = {
"created": datetime.datetime.utcnow().isoformat() + "Z",
"created": now,
"architecture": architecture,
"os": "linux",
"config": config_from_options(options["config"]),
"rootfs": {
"type": "layers",
"diff_ids": []
}
},
"history": []
}
manifest = {
@ -260,8 +263,12 @@ def create_oci_dir(inputs, output_dir, options):
tree = inputs[ip]["path"]
digest, info = blobs_add_layer(blobs, tree)
config["rootfs"]["diff_ids"] = [digest]
manifest["layers"].append(info)
config["rootfs"]["diff_ids"] = [digest]
config["history"].append({
"created": now,
"created_by": f"/bin/sh -c #(nop) osbuild input '{ip}'"
})
## write config
info = blobs_add_json(blobs, config, "config")