SysPaths.py revision 13731
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 29 30from six import string_types 31import os, sys 32 33config_path = os.path.dirname(os.path.abspath(__file__)) 34config_root = os.path.dirname(config_path) 35 36class PathSearchFunc(object): 37 _sys_paths = None 38 39 def __init__(self, subdirs, sys_paths=None): 40 if isinstance(subdirs, string_types): 41 subdirs = [subdirs] 42 self._subdir = os.path.join(*subdirs) 43 if sys_paths: 44 self._sys_paths = sys_paths 45 46 def __call__(self, filename): 47 if self._sys_paths is None: 48 try: 49 paths = os.environ['M5_PATH'].split(':') 50 except KeyError: 51 paths = [ '/dist/m5/system', '/n/poolfs/z/dist/m5/system' ] 52 53 # expand '~' and '~user' in paths 54 paths = map(os.path.expanduser, paths) 55 56 # filter out non-existent directories 57 paths = filter(os.path.isdir, paths) 58 59 if not paths: 60 raise IOError("Can't find a path to system files.") 61 62 self._sys_paths = list(paths) 63 64 filepath = os.path.join(self._subdir, filename) 65 paths = (os.path.join(p, filepath) for p in self._sys_paths) 66 try: 67 return next(p for p in paths if os.path.exists(p)) 68 except StopIteration: 69 raise IOError("Can't find file '%s' on path." % filename) 70 71disk = PathSearchFunc('disks') 72binary = PathSearchFunc('binaries') 73script = PathSearchFunc('boot', sys_paths=[config_root]) 74