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During builds var_overlay is always mounted over /var. We want to do the same at run time but we also want to ensure everything expected to be there always does. After emerge completes gen_tmpfiles.py will scan /var for any .keep files that were installed and records their parent directories' permissions and ownership to /usr/lib/tmpfiles.d. On each boot systemd will automatically recreate anything that goes missing. This also means that going forward any ebuild that needs a directory in /var (or anywhere else the stateful partition is bound) can simply rely on the 'keepdir' ebuild function instead of adding things to coreos_startup.
84 lines
2.3 KiB
Python
Executable File
84 lines
2.3 KiB
Python
Executable File
#!/usr/bin/python
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'''Scan an existing directory tree and record installed directories.
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During build a number of directories under /var are created in the stateful
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partition. We want to make sure that those are always there so create a record
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of them using systemd's tempfiles config format so they are recreated during
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boot if they go missing for any reason.
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'''
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import optparse
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import os
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import stat
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import sys
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import pwd
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import grp
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def main():
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keep = set()
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parser = optparse.OptionParser(description=__doc__)
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parser.add_option('--root', help='Remove root prefix from output')
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parser.add_option('--output', help='Write output to the given file')
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opts, args = parser.parse_args()
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if opts.root:
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opts.root = os.path.abspath(opts.root)
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for path in args:
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path = os.path.abspath(path)
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if opts.root:
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assert path.startswith(opts.root)
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for dirpath, dirnames, filenames in os.walk(path):
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if any(f.startswith('.keep') for f in filenames):
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keep.add(dirpath)
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# Add all parent directories too
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for path in frozenset(keep):
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split = []
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for pathbit in path.split('/'):
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split.append(pathbit)
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joined = '/'.join(split)
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if not joined:
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continue
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if opts.root and not joined.startswith(opts.root):
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continue
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if opts.root == joined:
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continue
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keep.add(joined)
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config = []
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for path in sorted(keep):
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if opts.root:
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assert path.startswith(opts.root)
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stripped = path[len(opts.root):]
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assert len(stripped) > 1
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else:
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stripped = path
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info = os.stat(path)
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assert stat.S_ISDIR(info.st_mode)
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mode = stat.S_IMODE(info.st_mode)
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try:
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owner = pwd.getpwuid(info.st_uid).pw_name
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except KeyError:
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owner = str(info.st_uid)
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try:
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group = grp.getgrgid(info.st_gid).gr_name
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except KeyError:
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group = str(info.st_gid)
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config.append('d %-22s %04o %-10s %-10s - -'
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% (stripped, mode, owner, group))
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if opts.output:
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fd = open(opts.output, 'w')
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fd.write('\n'.join(config))
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fd.close()
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else:
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print '\n'.join(config)
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if __name__ == '__main__':
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main()
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