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# Copyright (C) 2009-2012 Chris Ball <cjb@laptop.org>
# W. Trevor King <wking@drexel.edu>
#
# This file is part of Bugs Everywhere.
#
# Bugs Everywhere is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the Free
# Software Foundation, either version 2 of the License, or (at your option) any
# later version.
#
# Bugs Everywhere is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
# more details.
#
# You should have received a copy of the GNU General Public License along with
# Bugs Everywhere. If not, see <http://www.gnu.org/licenses/>.
"""
Functions for running external commands in subprocesses.
"""
from subprocess import Popen, PIPE
import sys
import types
import libbe
from encoding import get_encoding
if libbe.TESTING == True:
import doctest
_MSWINDOWS = sys.platform == 'win32'
_POSIX = not _MSWINDOWS
if _POSIX == True:
import os
import select
class CommandError(Exception):
def __init__(self, command, status, stdout=None, stderr=None):
strerror = ['Command failed (%d):\n %s\n' % (status, stderr),
'while executing\n %s' % str(command)]
Exception.__init__(self, '\n'.join(strerror))
self.command = command
self.status = status
self.stdout = stdout
self.stderr = stderr
def invoke(args, stdin=None, stdout=PIPE, stderr=PIPE, expect=(0,),
cwd=None, shell=None, unicode_output=True, verbose=False,
encoding=None, **kwargs):
"""
expect should be a tuple of allowed exit codes. cwd should be
the directory from which the command will be executed. When
unicode_output == True, convert stdout and stdin strings to
unicode before returing them.
"""
if cwd == None:
cwd = '.'
if isinstance(shell, types.StringTypes):
list_args = ' '.split(args) # sloppy, but just for logging
str_args = args
else:
list_args = args
str_args = ' '.join(args) # sloppy, but just for logging
if verbose == True:
print >> sys.stderr, '%s$ %s' % (cwd, str_args)
try :
if _POSIX:
if shell is None:
shell = False
q = Popen(args, stdin=PIPE, stdout=stdout, stderr=stderr,
shell=shell, cwd=cwd, **kwargs)
else:
assert _MSWINDOWS==True, 'invalid platform'
if shell is None:
shell = True
# win32 don't have os.execvp() so have to run command in a shell
q = Popen(args, stdin=PIPE, stdout=stdout, stderr=stderr,
shell=shell, cwd=cwd, **kwargs)
except OSError, e:
raise CommandError(list_args, status=e.args[0], stderr=e)
stdout,stderr = q.communicate(input=stdin)
status = q.wait()
if unicode_output == True:
if encoding == None:
encoding = get_encoding()
if stdout != None:
stdout = unicode(stdout, encoding)
if stderr != None:
stderr = unicode(stderr, encoding)
if verbose == True:
print >> sys.stderr, '%d\n%s%s' % (status, stdout, stderr)
if status not in expect:
raise CommandError(list_args, status, stdout, stderr)
return status, stdout, stderr
if libbe.TESTING == True:
suite = doctest.DocTestSuite()
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