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  • Committer: Martin Pool
  • Date: 2005-05-12 02:18:48 UTC
  • Revision ID: mbp@sourcefrog.net-20050512021848-d1a727373aee2c85
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bzrlib/gpg.py
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# Copyright (C) 2005 Canonical Ltd
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#   Authors: Robert Collins <robert.collins@canonical.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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"""GPG signing and checking logic."""
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import os
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import sys
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from bzrlib.lazy_import import lazy_import
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lazy_import(globals(), """
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import errno
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import subprocess
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from bzrlib import (
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    errors,
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    trace,
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    ui,
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    )
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""")
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class DisabledGPGStrategy(object):
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    """A GPG Strategy that makes everything fail."""
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    def __init__(self, ignored):
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        """Real strategies take a configuration."""
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    def sign(self, content):
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        raise errors.SigningFailed('Signing is disabled.')
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class LoopbackGPGStrategy(object):
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    """A GPG Strategy that acts like 'cat' - data is just passed through."""
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    def __init__(self, ignored):
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        """Real strategies take a configuration."""
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    def sign(self, content):
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        return ("-----BEGIN PSEUDO-SIGNED CONTENT-----\n" + content +
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                "-----END PSEUDO-SIGNED CONTENT-----\n")
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def _set_gpg_tty():
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    tty = os.environ.get('TTY')
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    if tty is not None:
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        os.environ['GPG_TTY'] = tty
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        trace.mutter('setting GPG_TTY=%s', tty)
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    else:
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        # This is not quite worthy of a warning, because some people
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        # don't need GPG_TTY to be set. But it is worthy of a big mark
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        # in ~/.bzr.log, so that people can debug it if it happens to them
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        trace.mutter('** Env var TTY empty, cannot set GPG_TTY.'
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                     '  Is TTY exported?')
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class GPGStrategy(object):
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    """GPG Signing and checking facilities."""
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    def _command_line(self):
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        return [self._config.gpg_signing_command(), '--clearsign']
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    def __init__(self, config):
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        self._config = config
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    def sign(self, content):
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        if isinstance(content, unicode):
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            raise errors.BzrBadParameterUnicode('content')
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        ui.ui_factory.clear_term()
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        preexec_fn = _set_gpg_tty
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        if sys.platform == 'win32':
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            # Win32 doesn't support preexec_fn, but wouldn't support TTY anyway.
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            preexec_fn = None
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        try:
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            process = subprocess.Popen(self._command_line(),
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                                       stdin=subprocess.PIPE,
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                                       stdout=subprocess.PIPE,
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                                       preexec_fn=preexec_fn)
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            try:
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                result = process.communicate(content)[0]
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                if process.returncode is None:
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                    process.wait()
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                if process.returncode != 0:
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                    raise errors.SigningFailed(self._command_line())
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                return result
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            except OSError, e:
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                if e.errno == errno.EPIPE:
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                    raise errors.SigningFailed(self._command_line())
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                else:
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                    raise
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        except ValueError:
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            # bad subprocess parameters, should never happen.
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            raise
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        except OSError, e:
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            if e.errno == errno.ENOENT:
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                # gpg is not installed
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                raise errors.SigningFailed(self._command_line())
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            else:
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                raise