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from io import open
from os import environ
from os.path import isfile
from subprocess import PIPE, Popen
import sys
def _determineMounts():
# The MSYS shell provides a Unix-like file system by translating paths on
# the command line to Windows paths. Usually this is transparent, but not
# for us since we call GCC without going through the shell.
# Figure out the root directory of MSYS.
proc = Popen(
[ msysShell(), '-c', '"%s" -c \'import sys ; print sys.argv[1]\' /'
% sys.executable.replace('\\', '\\\\') ],
stdin = None,
stdout = PIPE,
stderr = PIPE,
)
stdoutdata, stderrdata = proc.communicate()
if stderrdata or proc.returncode:
if stderrdata:
print('Error determining MSYS root:', stderrdata, file=sys.stderr)
if proc.returncode:
print('Exit code %d' % proc.returncode, file=sys.stderr)
raise OSError('Error determining MSYS root')
msysRoot = stdoutdata.strip()
# Figure out all mount points of MSYS.
mounts = {}
fstab = msysRoot + '/etc/fstab'
if isfile(fstab):
try:
with open(fstab, 'r', encoding='utf-8') as inp:
for line in inp:
line = line.strip()
if line and not line.startswith('#'):
nativePath, mountPoint = (
path.rstrip('/') + '/' for path in line.split()[:2]
)
if nativePath != 'none':
mounts[mountPoint] = nativePath
except OSError as ex:
print('Failed to read MSYS fstab:', ex, file=sys.stderr)
except ValueError as ex:
print('Failed to parse MSYS fstab:', ex, file=sys.stderr)
mounts['/'] = msysRoot + '/'
return mounts
def msysPathToNative(path):
if path.startswith('/'):
if len(path) == 2 or (len(path) > 2 and path[2] == '/'):
# Support drive letters as top-level dirs.
return '%s:/%s' % (path[1], path[3 : ])
longestMatch = ''
for mountPoint in msysMounts.keys():
if path.startswith(mountPoint):
if len(mountPoint) > len(longestMatch):
longestMatch = mountPoint
return msysMounts[longestMatch] + path[len(longestMatch) : ]
else:
return path
def msysActive():
return environ.get('OSTYPE') == 'msys' or 'MSYSCON' in environ
def msysShell():
return environ.get('SHELL') or 'sh.exe'
if msysActive():
msysMounts = _determineMounts()
else:
msysMounts = None
if __name__ == '__main__':
print('MSYS mounts:', msysMounts)
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