41 lines
1.3 KiB
Python
41 lines
1.3 KiB
Python
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#!/usr/bin/env python
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from __future__ import print_function
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import os
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import sys
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# Find the best reverse path to reference the current directory from another
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# directory. We use this to find relative paths to and from the source and build
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# directories.
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#
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# If the directory is given as an absolute path, return an absolute path to the
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# current directory.
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#
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# If there's a symlink involved, and the same relative path would not work if
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# the symlink was replace with a regular directory, then return an absolute
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# path. This handles paths like out -> /mnt/ssd/out
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#
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# For symlinks that can use the same relative path (out -> out.1), just return
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# the relative path. That way out.1 can be renamed as long as the symlink is
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# updated.
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#
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# For everything else, just return the relative path. That allows the source and
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# output directories to be moved as long as they stay in the same position
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# relative to each other.
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def reverse_path(path):
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if path.startswith("/"):
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return os.path.abspath('.')
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realpath = os.path.relpath(os.path.realpath('.'), os.path.realpath(path))
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relpath = os.path.relpath('.', path)
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if realpath != relpath:
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return os.path.abspath('.')
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return relpath
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if __name__ == '__main__':
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print(reverse_path(sys.argv[1]))
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