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from msysutils import msysActive, msysShell
from os import environ
from shlex import split as shsplit
from subprocess import PIPE, Popen
def captureStdout(log, commandLine):
'''Run a command and capture what it writes to stdout.
If the command fails or writes something to stderr, that is logged.
Returns the captured string, or None if the command failed.
'''
# TODO: This is a modified copy-paste from compilers._Command.
commandParts = shsplit(commandLine)
env = dict(environ)
while commandParts:
if '=' in commandParts[0]:
name, value = commandParts[0].split('=', 1)
del commandParts[0]
env[name] = value
else:
break
else:
raise ValueError(
'No command specified in "%s"' % commandLine
)
if msysActive() and commandParts[0] != 'sh':
commandParts = [
environ.get('MSYSCON') or environ.get('SHELL') or 'sh.exe',
'-c', shjoin(commandParts)
]
try:
proc = Popen(
commandParts, bufsize = -1, env = env,
stdin = None, stdout = PIPE, stderr = PIPE,
)
except OSError, ex:
print >> log, 'Failed to execute "%s": %s' % (commandLine, ex)
return None
stdoutdata, stderrdata = proc.communicate()
if stderrdata:
severity = 'warning' if proc.returncode == 0 else 'error'
log.write('%s executing "%s"\n' % (severity.capitalize(), commandLine))
# pylint 0.18.0 somehow thinks stderrdata is a list, not a string.
# pylint: disable-msg=E1103
stderrdata = stderrdata.replace('\r', '')
log.write(stderrdata)
if not stderrdata.endswith('\n'):
log.write('\n')
if proc.returncode == 0:
return stdoutdata
else:
print >> log, 'Execution failed with exit code %d' % proc.returncode
return None
def shjoin(parts):
'''Joins the given sequence into a single string with space as a separator.
Characters that have a special meaning for the shell are escaped.
This is the counterpart of shlex.split().
'''
def escape(part):
return ''.join(
'\\' + ch if ch in '\\ \'"$()[]' else ch
for ch in part
)
return ' '.join(escape(part) for part in parts)
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