SysPaths.py revision 12233
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 9# notice, this list of conditions and the following disclaimer in the 10# documentation and/or other materials provided with the distribution; 11# neither the name of the copyright holders nor the names of its 12# contributors may be used to endorse or promote products derived from 13# this software without specific prior written permission. 14# 15# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 18# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 19# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 20# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 21# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 25# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26# 27# Authors: Ali Saidi 28 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): 38 self._subdir = os.path.join(*subdirs) 39 40 def __call__(self, filename): 41 if self._sys_paths is None: 42 try: 43 paths = os.environ['M5_PATH'].split(':') 44 except KeyError: 45 paths = [ '/dist/m5/system', '/n/poolfs/z/dist/m5/system' ] 46 47 # expand '~' and '~user' in paths 48 paths = map(os.path.expanduser, paths) 49 50 # filter out non-existent directories 51 paths = filter(os.path.isdir, paths) 52 53 if not paths: 54 raise IOError, "Can't find a path to system files." 55 56 self._sys_paths = paths 57 58 filepath = os.path.join(self._subdir, filename) 59 paths = (os.path.join(p, filepath) for p in self._sys_paths) 60 try: 61 return next(p for p in paths if os.path.exists(p)) 62 except StopIteration: 63 raise IOError, "Can't find file '%s' on path." % filename 64 65disk = PathSearchFunc('disks') 66binary = PathSearchFunc('binaries') 67script = PathSearchFunc('boot') 68