1# Copyright (c) 2006 The Regents of The University of Michigan
2# All rights reserved.
3#
4# Redistribution and use in source and binary forms, with or without
5# modification, are permitted provided that the following conditions are
6# met: redistributions of source code must retain the above copyright
7# notice, this list of conditions and the following disclaimer;
8# redistributions in binary form must reproduce the above copyright

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29import os, sys
30
31config_path = os.path.dirname(os.path.abspath(__file__))
32config_root = os.path.dirname(config_path)
33
34class PathSearchFunc(object):
35 _sys_paths = None
36
37 def __init__(self, subdirs, sys_paths=None):
38 if isinstance(subdirs, basestring):
39 subdirs = [subdirs]
40 self._subdir = os.path.join(*subdirs)
41 if sys_paths:
42 self._sys_paths = sys_paths
43
44 def __call__(self, filename):
45 if self._sys_paths is None:
46 try:
47 paths = os.environ['M5_PATH'].split(':')
48 except KeyError:
49 paths = [ '/dist/m5/system', '/n/poolfs/z/dist/m5/system' ]
50

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63 paths = (os.path.join(p, filepath) for p in self._sys_paths)
64 try:
65 return next(p for p in paths if os.path.exists(p))
66 except StopIteration:
67 raise IOError, "Can't find file '%s' on path." % filename
68
69disk = PathSearchFunc('disks')
70binary = PathSearchFunc('binaries')
71script = PathSearchFunc('boot', sys_paths=[config_root])