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Python3 script to find descendants of one or more docker images
#!/usr/bin/python3
#
# usage: python3 docker_descendants.py <image_id> ...
import sys
from subprocess import check_output
def main(images):
image_ids = set(images)
all_images = docker_images('--all', '--quiet')
all_links = parse_links(docker_links(all_images))
descendants = desc(image_ids, all_links)
pred = lambda s: lambda line: s[:12] in line
match = list(map(pred, descendants))
return filter(lambda i: any(s(i) for s in match), docker_images())
def parse_links(lines):
parseid = lambda s: s.replace('sha256:', '')
for line in reversed(list(lines)):
yield list(map(parseid, line.split()))
def desc(image_ids, links):
if links:
link, *tail = links
if len(link) > 1:
image_id, parent_id = link
checkid = lambda i: parent_id.startswith(i)
if any(map(checkid, image_ids)):
return desc(image_ids | {image_id}, tail)
return desc(image_ids, tail)
return image_ids
def docker_links(images):
cmd = [ 'docker', 'inspect', '--format={{.Id}} {{.Parent}}']
return run(cmd + images)
def docker_images(*args):
return run(('docker', 'images') + args)
def run(cmd):
return check_output(cmd, universal_newlines=True).splitlines()
if __name__ == '__main__':
print('\n'.join(main(sys.argv[1:])))
# License
# --------
#
# Copyright (C) 2017 Aryeh Leib Taurog <python@aryehleib.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.
@Shivarp1
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Shivarp1 commented May 8, 2020

very nice ! Thanks

@josegonzalez
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josegonzalez commented Nov 26, 2020

Can you add a license to this script?

@altaurog
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Author

altaurog commented Nov 26, 2020

Can you add a license to this script?

done, @josegonzalez

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