SysPaths.py revision 10682:3d17366c0423
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 30from os.path import isdir, join as joinpath 31from os import environ as env 32 33config_path = os.path.dirname(os.path.abspath(__file__)) 34config_root = os.path.dirname(config_path) 35 36def searchpath(path, filename): 37 for p in path: 38 f = joinpath(p, filename) 39 if os.path.exists(f): 40 return f 41 raise IOError, "Can't find file '%s' on path." % filename 42 43def disk(filename): 44 system() 45 return searchpath(disk.path, filename) 46 47def binary(filename): 48 system() 49 return searchpath(binary.path, filename) 50 51def script(filename): 52 system() 53 return searchpath(script.path, filename) 54 55def system(): 56 if not system.path: 57 try: 58 path = env['M5_PATH'].split(':') 59 except KeyError: 60 path = [ '/dist/m5/system', '/n/poolfs/z/dist/m5/system' ] 61 62 # filter out non-existent directories 63 system.path = filter(os.path.isdir, path) 64 65 if not system.path: 66 raise IOError, "Can't find a path to system files." 67 68 if not binary.path: 69 binary.path = [joinpath(p, 'binaries') for p in system.path] 70 if not disk.path: 71 disk.path = [joinpath(p, 'disks') for p in system.path] 72 if not script.path: 73 script.path = [joinpath(config_root, 'boot')] 74 75system.path = None 76binary.path = None 77disk.path = None 78script.path = None 79