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41 lines
1.4 KiB
Python
41 lines
1.4 KiB
Python
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#!/usr/bin/python3
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"""
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Proof-of-concept systemd environment generator that makes sure that bin dirs
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are always after matching sbin dirs in the path.
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(Changes /sbin:/bin:/foo/bar to /bin:/sbin:/foo/bar.)
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This generator shows how to override the configuration possibly created by
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earlier generators. It would be easier to write in bash, but let's have it
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in Python just to prove that we can, and to serve as a template for more
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interesting generators.
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"""
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import os
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import pathlib
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def rearrange_bin_sbin(path):
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"""Make sure any pair of …/bin, …/sbin directories is in this order
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>>> rearrange_bin_sbin('/bin:/sbin:/usr/sbin:/usr/bin')
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'/bin:/sbin:/usr/bin:/usr/sbin'
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"""
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items = [pathlib.Path(p) for p in path.split(':')]
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for i in range(len(items)):
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if 'sbin' in items[i].parts:
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ind = items[i].parts.index('sbin')
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bin = pathlib.Path(*items[i].parts[:ind], 'bin', *items[i].parts[ind+1:])
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if bin in items[i+1:]:
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j = i + 1 + items[i+1:].index(bin)
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items[i], items[j] = items[j], items[i]
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return ':'.join(p.as_posix() for p in items)
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if __name__ == '__main__':
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path = os.environ['PATH'] # This should be always set.
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# If it's not, we'll just crash, we is OK too.
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new = rearrange_bin_sbin(path)
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if new != path:
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print('PATH={}'.format(new))
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