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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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 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 # expand '~' and '~user' in paths
63 path = map(os.path.expanduser, path)
64
65 # filter out non-existent directories
66 system.path = filter(os.path.isdir, path)
67
68 if not system.path:
69 raise IOError, "Can't find a path to system files."
70
71 if not binary.path:
72 binary.path = [joinpath(p, 'binaries') for p in system.path]
73 if not disk.path:
74 disk.path = [joinpath(p, 'disks') for p in system.path]
75 if not script.path:
76 script.path = [joinpath(config_root, 'boot')]
77
78system.path = None
79binary.path = None
80disk.path = None
81script.path = None