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Save images as oci-archive #394

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Save images as oci-archive #394

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a80f105
With Podman, save images as oci-archive so they are compressed
marco-c Sep 21, 2023
cf2d9c2
Support reading archive tags from oci-archive format
marco-c Sep 21, 2023
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34 changes: 23 additions & 11 deletions taskboot/docker.py
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Original file line number Diff line number Diff line change
Expand Up @@ -33,17 +33,22 @@ def read_archive_tags(path):
tar = tarfile.open(path)
tags = []
try:
manifest_raw = tar.extractfile("manifest.json")
manifest = json.loads(manifest_raw.read().decode("utf-8"))
tags = manifest[0]["RepoTags"]
index_raw = tar.extractfile("index.json")
index = json.loads(index_raw.read().decode("utf-8"))
tags = index["manifests"][0]["annotations"]["org.opencontainers.image.ref.name"]
except KeyError:
# Use older image format:
# {"registry.hub.docker.com/xyz/":{"master":"02d3443146cc39d41207919f156869d60942cd3eafeec793a4ac39f905f6f7c6"}}
repositories_raw = tar.extractfile("repositories")
repositories = json.loads(repositories_raw.read().decode("utf-8"))
for repo, tag_and_sha in repositories.items():
for tag, sha in tag_and_sha.items():
tags.append("{}:{}".format(repo, tag))
try:
manifest_raw = tar.extractfile("manifest.json")
manifest = json.loads(manifest_raw.read().decode("utf-8"))
tags = manifest[0]["RepoTags"]
except KeyError:
# Use older image format:
# {"registry.hub.docker.com/xyz/":{"master":"02d3443146cc39d41207919f156869d60942cd3eafeec793a4ac39f905f6f7c6"}}
repositories_raw = tar.extractfile("repositories")
repositories = json.loads(repositories_raw.read().decode("utf-8"))
for repo, tag_and_sha in repositories.items():
for tag, sha in tag_and_sha.items():
tags.append("{}:{}".format(repo, tag))

assert len(tags) > 0, "No tags found"
return tags
Expand Down Expand Up @@ -314,6 +319,13 @@ def list_images(self):
image["digest"] = image["digest"][7:]
return result

def save(self, tags, path):
assert isinstance(tags, list)
assert len(tags) > 0, "Missing tags"
logger.info("Saving image with tags {} to {}".format(", ".join(tags), path))
command = ["save", "--format", "oci-archive", "--output", path] + tags
self.run(command)


class Skopeo(Tool):
"""
Expand Down Expand Up @@ -361,7 +373,7 @@ def push_archive(self, path, custom_tag=None):
"copy",
"--authfile",
self.auth_file,
"docker-archive:{}".format(path),
"oci-archive:{}".format(path),
"docker://{}".format(tag),
]
self.run(cmd)
Expand Down