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# Copyright (C) 2005 by Canonical Ltd
# Authors: Robert Collins <robert.collins@canonical.com>
#
# 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; either version 2 of the License, or
# (at your option) any later version.
#
# 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""GPG signing and checking logic."""
import errno
import subprocess
import bzrlib.errors as errors
class DisabledGPGStrategy(object):
"""A GPG Strategy that makes everything fail."""
def __init__(self, ignored):
"""Real strategies take a configuration."""
def sign(self, content):
raise errors.SigningFailed('Signing is disabled.')
class LoopbackGPGStrategy(object):
"""A GPG Strategy that acts like 'cat' - data is just passed through."""
def __init__(self, ignored):
"""Real strategies take a configuration."""
def sign(self, content):
return content
class GPGStrategy(object):
"""GPG Signing and checking facilities."""
def _command_line(self):
return [self._config.gpg_signing_command(), '--clearsign']
def __init__(self, config):
self._config = config
def sign(self, content):
try:
process = subprocess.Popen(self._command_line(),
stdin=subprocess.PIPE,
stdout=subprocess.PIPE)
try:
result = process.communicate(content)[0]
if process.returncode is None:
process.wait()
if process.returncode != 0:
raise errors.SigningFailed(self._command_line())
return result
except OSError, e:
if e.errno == errno.EPIPE:
raise errors.SigningFailed(self._command_line())
else:
raise
except ValueError:
# bad subprocess parameters, should never happen.
raise
except OSError, e:
if e.errno == errno.ENOENT:
# gpg is not installed
raise errors.SigningFailed(self._command_line())
else:
raise
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