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68 lines
2.6 KiB
Python
Executable File
68 lines
2.6 KiB
Python
Executable File
# -*- coding: utf-8 -*-
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# This is a stopgap to maintain Python 2.7 support for the 0.9.0 release.
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#
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# Code copied from the "shutilwhich" project by Marc Brinkmann (@mbr)
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# Source: https://github.com/mbr/shutilwhich
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#
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# We can't depend on it in setup.py since getmac has the __version__,
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# which is imported in setup.py, which requires shutilwhich to be installed,
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# leading to the typical problem: which came first, the Python or the Egg? :)
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import os
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import sys
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# Everything below this point has been copied verbatim from the Python-3.3
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# sources.
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def which(cmd, mode=os.F_OK | os.X_OK, path=None):
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"""Given a command, mode, and a PATH string, return the path which
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conforms to the given mode on the PATH, or None if there is no such
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file.
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`mode` defaults to os.F_OK | os.X_OK. `path` defaults to the result
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of os.environ.get("PATH"), or can be overridden with a custom search
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path.
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"""
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# Check that a given file can be accessed with the correct mode.
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# Additionally check that `file` is not a directory, as on Windows
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# directories pass the os.access check.
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def _access_check(fn, mode):
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return os.path.exists(fn) and os.access(fn, mode) and not os.path.isdir(fn)
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# Short circuit. If we're given a full path which matches the mode
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# and it exists, we're done here.
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if _access_check(cmd, mode):
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return cmd
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path = (path or os.environ.get("PATH", os.defpath)).split(os.pathsep)
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if sys.platform == "win32":
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# The current directory takes precedence on Windows.
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if os.curdir not in path:
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path.insert(0, os.curdir)
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# PATHEXT is necessary to check on Windows.
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pathext = os.environ.get("PATHEXT", "").split(os.pathsep)
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# See if the given file matches any of the expected path extensions.
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# This will allow us to short circuit when given "python.exe".
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matches = [cmd for ext in pathext if cmd.lower().endswith(ext.lower())]
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# If it does match, only test that one, otherwise we have to try
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# others.
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files = [cmd] if matches else [cmd + ext.lower() for ext in pathext]
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else:
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# On other platforms you don't have things like PATHEXT to tell you
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# what file suffixes are executable, so just pass on cmd as-is.
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files = [cmd]
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seen = set()
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for dir in path:
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dir = os.path.normcase(dir)
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if dir not in seen:
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seen.add(dir)
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for thefile in files:
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name = os.path.join(dir, thefile)
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if _access_check(name, mode):
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return name
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return None
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