52 lines
1.3 KiB
Plaintext
52 lines
1.3 KiB
Plaintext
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#!/usr/bin/python3
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#
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# usage: python3 docker_descendants.py <image_id> ...
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import sys
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from subprocess import check_output
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def main(images):
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image_ids = set(images)
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all_images = docker_images('--all', '--quiet')
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all_links = parse_links(docker_links(all_images))
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descendants = desc(image_ids, all_links)
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pred = lambda s: lambda line: s[:12] in line
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match = list(map(pred, descendants))
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return filter(lambda i: any(s(i) for s in match), docker_images())
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def parse_links(lines):
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parseid = lambda s: s.replace('sha256:', '')
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for line in reversed(list(lines)):
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yield list(map(parseid, line.split()))
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def desc(image_ids, links):
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if links:
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link, *tail = links
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if len(link) > 1:
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image_id, parent_id = link
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checkid = lambda i: parent_id.startswith(i)
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if any(map(checkid, image_ids)):
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return desc(image_ids | {image_id}, tail)
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return desc(image_ids, tail)
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return image_ids
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def docker_links(images):
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cmd = [ 'docker', 'inspect', '--format={{.Id}} {{.Parent}}']
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return run(cmd + images)
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def docker_images(*args):
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return run(('docker', 'images') + args)
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def run(cmd):
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return check_output(cmd, universal_newlines=True).splitlines()
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if __name__ == '__main__':
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print('\n'.join(main(sys.argv[1:])))
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