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# Copyright (C) 2011 Codethink Limited
#
# This program 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; version 2 of the License.
#
# This program 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 this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
import cliapp
import logging
import os
import subprocess
import tempfile
import morphlib
class CommandFailure(cliapp.AppException):
def __init__(self, command, stderr):
cliapp.AppException.__init__(self,
'Command failed: %s\nOutput from command:\n%s' %
(command, stderr))
class Execute(object):
'''Execute commands for morph.'''
def __init__(self, dirname, msg):
self._setup_env()
self.dirname = dirname
self.msg = msg
self._fakeroot_session = None
def __del__(self): # pragma: no cover
if self._fakeroot_session:
os.remove(self._fakeroot_session)
def _setup_env(self):
self.env = dict(os.environ)
def _prefix(self, argv, as_root, as_fakeroot):
if as_root: # pragma: no cover
if os.getuid() == 0:
prefix = ['env']
else:
prefix = ['sudo']
envs = ["%s=%s" % x for x in self.env.iteritems()]
argv = prefix + envs + argv
elif as_fakeroot and os.getuid() != 0:
if not self._fakeroot_session:
self._fakeroot_session = tempfile.mkstemp()[1]
argv = ['fakeroot', '-i', self._fakeroot_session, '-s',
self._fakeroot_session, '--'] + argv
return argv
def run(self, commands, as_root=False, as_fakeroot=False, _log=True):
'''Execute a list of commands.
If a command fails (returns non-zero exit code), the rest are
not run, and CommandFailure is returned.
'''
stdouts = []
for command in commands:
self.msg('# %s' % command)
argv = ['sh', '-c', command]
argv = self._prefix(argv, as_root, as_fakeroot)
logging.debug('run: argv=%s' % repr(argv))
logging.debug('run: env=%s' % repr(self.env))
logging.debug('run: cwd=%s' % repr(self.dirname))
p = subprocess.Popen(argv, shell=False,
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT,
env=self.env,
cwd=self.dirname)
out, err = p.communicate()
if p.returncode != 0:
if _log: # pragma: no cover
logging.error('Exit code: %d' % p.returncode)
logging.error('Standard output and error:\n%s' %
morphlib.util.indent(out))
raise CommandFailure(command, out)
stdouts.append(out)
return stdouts
def runv(self, argv, feed_stdin=None, as_root=False, as_fakeroot=False,
_log=True, **kwargs):
'''Run a command given as a list of argv elements.
Return standard output. Raise ``CommandFailure`` if the command
fails. Log standard output and error in any case.
'''
if 'stdout' not in kwargs:
kwargs['stdout'] = subprocess.PIPE
if feed_stdin is not None and 'stdin' not in kwargs:
kwargs['stdin'] = subprocess.PIPE # pragma: no cover
if 'stderr' not in kwargs:
kwargs['stderr'] = subprocess.STDOUT
if 'cwd' not in kwargs:
kwargs['cwd'] = self.dirname
if 'env' not in kwargs:
kwargs['env'] = self.env
argv = self._prefix(argv, as_root, as_fakeroot)
logging.debug('runv: argv=%s' % repr(argv))
logging.debug('runv: env=%s' % repr(self.env))
logging.debug('runv: cwd=%s' % repr(self.dirname))
self.msg('# %s' % ' '.join(argv))
p = subprocess.Popen(argv, **kwargs)
out, err = p.communicate(feed_stdin)
if p.returncode != 0:
if _log: # pragma: no cover
logging.error('Exit code: %d' % p.returncode)
logging.error('Standard output:\n%s' %
morphlib.util.indent(out or ''))
logging.error('Standard error:\n%s' %
morphlib.util.indent(err or ''))
raise CommandFailure(' '.join(argv), out)
return out
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