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parse-image-sha.py
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parse-image-sha.py
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#!/usr/bin/env python
# Copyright 2021 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# This script pulls the docker images for dns containers and outputs the sha256
# digests for each of the supported arch images.
# These will be used to promote the images to k8s.gcr.io.
import argparse
import json
import subprocess
REGISTRY = "gcr.io/k8s-staging-dns"
MANIFESTS = ["k8s-dns-dnsmasq-nanny", "k8s-dns-kube-dns", "k8s-dns-sidecar", "k8s-dns-node-cache"]
TAG_NAME = "1.21.1"
def main():
parser = argparse.ArgumentParser(description="Display sha256 for DNS images to be promoted.")
parser.add_argument("tagname", nargs="?", default=TAG_NAME)
parser.add_argument("registry", nargs="?", default=REGISTRY)
args = parser.parse_args()
for m in MANIFESTS:
mname = "%s/%s:%s" % (args.registry, m, args.tagname)
out, err = subprocess.Popen(["docker", "pull", mname], stdout=subprocess.PIPE).communicate()
outstr = out.decode('UTF-8')
if err or "Error" in outstr:
print("Docker pull hit error - %s, %s" % (err, outstr))
sys.exit(-1)
maincmd = ["docker", "inspect", "--format='{{index .RepoDigests 0}}'", mname]
out, err = subprocess.Popen(maincmd, stdout=subprocess.PIPE).communicate()
# output will be of the form -
# `gcr.io/k8s-staging-dns/k8s-dns-node-cache@sha256:e33f64f09345874878c4698578ffdf7ac82a7868723d10aa3825c0102333afe6`
values = out.decode('UTF-8').split("@")
sha = values[1].strip().rstrip("'")
name = values[0].split('/')[-1]
print(name + ":")
print(" \"%s\": [\"%s\"]" % (sha, args.tagname))
cmd = "docker manifest inspect " + mname
out, err = subprocess.Popen(cmd.split(), stdout=subprocess.PIPE).communicate()
parsed = json.loads(out)
for info in parsed["manifests"]:
img_name = m + "-" + info["platform"]["architecture"] + ":" + args.tagname
print("%s\n \"%s\": [\"%s\"]" % (img_name, info["digest"], args.tagname))
print("\n\n")
print("\n\n")
if __name__ == '__main__':
main()