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  • Committer: Jelmer Vernooij
  • Date: 2020-04-05 19:11:34 UTC
  • mto: (7490.7.16 work)
  • mto: This revision was merged to the branch mainline in revision 7501.
  • Revision ID: jelmer@jelmer.uk-20200405191134-0aebh8ikiwygxma5
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breezy/mergeable.py
 
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# Copyright (C) 2005-2010 Canonical Ltd
 
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 
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from __future__ import absolute_import
 
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from .lazy_import import lazy_import
 
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lazy_import(globals(), """
 
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from breezy import (
 
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    transport as _mod_transport,
 
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    urlutils,
 
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    )
 
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from breezy.bzr.bundle import serializer as _serializer
 
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from breezy.merge_directive import MergeDirective
 
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from breezy.i18n import gettext
 
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""")
 
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from . import (
 
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    errors,
 
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    )
 
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from .sixish import (
 
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    BytesIO,
 
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    )
 
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from .trace import note
 
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class Mergeable(object):
 
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    """A mergeable object."""
 
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    def install_revisions(self, repository):
 
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        """Install the data from this mergeable into the specified repository.
 
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        :param repository: Repository
 
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        """
 
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        raise NotImplementedError(self.install_revisions)
 
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    def get_merge_request(self, repository):
 
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        """Extract merge request data.
 
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        :return: tuple with (base_revision_id, target_revision_id, verified)
 
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        """
 
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        raise NotImplementedError(self.get_merge_request)
 
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def read_mergeable_from_url(url, _do_directive=True, possible_transports=None):
 
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    """Read mergable object from a given URL.
 
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    :return: An object supporting get_target_revision.  Raises NotABundle if
 
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        the target is not a mergeable type.
 
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    """
 
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    child_transport = _mod_transport.get_transport(
 
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        url, possible_transports=possible_transports)
 
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    transport = child_transport.clone('..')
 
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    filename = transport.relpath(child_transport.base)
 
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    mergeable, transport = read_mergeable_from_transport(transport, filename,
 
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                                                         _do_directive)
 
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    return mergeable
 
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def read_mergeable_from_transport(transport, filename, _do_directive=True):
 
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    def get_bundle(transport):
 
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        return BytesIO(transport.get_bytes(filename)), transport
 
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    def redirected_transport(transport, exception, redirection_notice):
 
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        note(redirection_notice)
 
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        url, filename = urlutils.split(exception.target,
 
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                                       exclude_trailing_slash=False)
 
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        if not filename:
 
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            raise errors.NotABundle(gettext('A directory cannot be a bundle'))
 
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        return _mod_transport.get_transport_from_url(url)
 
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    try:
 
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        bytef, transport = _mod_transport.do_catching_redirections(
 
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            get_bundle, transport, redirected_transport)
 
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    except errors.TooManyRedirections:
 
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        raise errors.NotABundle(transport.clone(filename).base)
 
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    except (errors.ConnectionReset, errors.ConnectionError) as e:
 
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        raise
 
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    except (errors.TransportError, errors.PathError) as e:
 
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        raise errors.NotABundle(str(e))
 
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    except (IOError,) as e:
 
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        # jam 20060707
 
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        # Abstraction leakage, SFTPTransport.get('directory')
 
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        # doesn't always fail at get() time. Sometimes it fails
 
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        # during read. And that raises a generic IOError with
 
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        # just the string 'Failure'
 
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        # StubSFTPServer does fail during get() (because of prefetch)
 
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        # so it has an opportunity to translate the error.
 
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        raise errors.NotABundle(str(e))
 
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    if _do_directive:
 
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        try:
 
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            return MergeDirective.from_lines(bytef), transport
 
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        except errors.NotAMergeDirective:
 
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            bytef.seek(0)
 
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    return _serializer.read_bundle(bytef), transport