CloudBuilder
6 years ago
parent
7b264f4d10
commit
c37d5f0434
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#!/usr/bin/python3
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"""
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Usage: snap-seed-parse ${chroot_dir} > somefile.manifest
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This script looks for a seed.yaml path in the given root directory, parsing
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it and printing generated manifest lines to stdout for easy redirection.
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"""
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import re
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import sys
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import yaml
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import os.path
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def log(msg):
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sys.stderr.write("snap-seed-parse: {}\n".format(msg))
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log("Parsing seed.yaml")
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CHROOT_ROOT = sys.argv[1] if len(sys.argv) > 1 and len(sys.argv[1]) > 0 \
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else ''
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# Trim any trailing slashes for correct appending
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log("CHROOT_ROOT: {}".format(CHROOT_ROOT))
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if len(CHROOT_ROOT) > 0 and CHROOT_ROOT[-1] == '/':
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CHROOT_ROOT = CHROOT_ROOT[:-1]
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# This is where we expect to find the seed.yaml file
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YAML_PATH = CHROOT_ROOT + '/var/lib/snapd/seed/seed.yaml'
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# Snaps are prepended with this string in the manifest
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LINE_PREFIX = 'snap:'
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log("yaml path: {}".format(YAML_PATH))
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if not os.path.isfile(YAML_PATH):
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log("WARNING: yaml path not found; no seeded snaps found.")
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exit(0)
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else:
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log("yaml path found.")
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with open(YAML_PATH, 'r') as fh:
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yaml_lines = yaml.safe_load(fh)['snaps']
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# Loop over dict items, outputting one manifest line from each triplet
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for item in yaml_lines:
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filestring = item['file']
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# Pull the revision number off the file name
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revision = filestring[filestring.rindex('_')+1:]
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revision = re.sub(r'[^0-9]', '', revision)
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print("{}{}\t{}\t{}".format(LINE_PREFIX,
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item['name'],
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item['channel'],
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revision,
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))
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