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config: make M5_PATH a real search path

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Although you can put a list of colon-separated directory names
in M5_PATH, the current code just takes the first one that
exists and assumes all files must live there.  This change
makes the code search the specified list of directories
for each individual binary or disk image that's requested.

The main motivation is that the x86/Alpha binaries and the
ARM binaries are in separate downloads, and thus naturally
end up in separate directories.  With this change, you can
have M5_PATH point to those two directories, then run any
FS regression test without changing M5_PATH.  Currently,
you either have to merge the two download directories
or change M5_PATH (or do something else I haven't figured out).
This commit is contained in:
Steve Reinhardt 2015-02-05 16:45:06 -08:00
parent 461a80beb3
commit 634d923751
1 changed files with 28 additions and 21 deletions
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49
configs/common/SysPaths.py
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@ -33,39 +33,46 @@ from os import environ as env
config_path = os.path.dirname(os.path.abspath(__file__))
config_root = os.path.dirname(config_path)
def searchpath(path, file):
for p in path:
f = joinpath(p, file)
if os.path.exists(f):
return f
raise IOError, "Can't find file '%s' on path." % file
def disk(file):
system()
return joinpath(disk.dir, file)
return searchpath(disk.path, file)
def binary(file):
system()
return joinpath(binary.dir, file)
return searchpath(binary.path, file)
def script(file):
system()
return joinpath(script.dir, file)
return searchpath(script.path, file)
def system():
if not system.dir:
if not system.path:
try:
path = env['M5_PATH'].split(':')
path = env['M5_PATH'].split(':')
except KeyError:
path = [ '/dist/m5/system', '/n/poolfs/z/dist/m5/system' ]
path = [ '/dist/m5/system', '/n/poolfs/z/dist/m5/system' ]
for system.dir in path:
if os.path.isdir(system.dir):
break
else:
raise ImportError, "Can't find a path to system files."
# filter out non-existent directories
system.path = filter(os.path.isdir, path)
if not binary.dir:
binary.dir = joinpath(system.dir, 'binaries')
if not disk.dir:
disk.dir = joinpath(system.dir, 'disks')
if not script.dir:
script.dir = joinpath(config_root, 'boot')
if not system.path:
raise IOError, "Can't find a path to system files."
system.dir = None
binary.dir = None
disk.dir = None
script.dir = None
if not binary.path:
binary.path = [joinpath(p, 'binaries') for p in system.path]
if not disk.path:
disk.path = [joinpath(p, 'disks') for p in system.path]
if not script.path:
script.path = [joinpath(config_root, 'boot')]
system.path = None
binary.path = None
disk.path = None
script.path = None