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# Copyright (C) 2005-2010 Canonical Ltd
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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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# 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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# 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 cStringIO import StringIO
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from bzrlib.lazy_import import lazy_import
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lazy_import(globals(), """
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transport as _mod_transport,
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from bzrlib.bundle import serializer as _serializer
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from bzrlib.merge_directive import MergeDirective
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from bzrlib.i18n import gettext
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from bzrlib.trace import note
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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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child_transport = _mod_transport.get_transport(url,
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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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def read_mergeable_from_transport(transport, filename, _do_directive=True):
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def get_bundle(transport):
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return StringIO(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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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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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), e:
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except (errors.TransportError, errors.PathError), e:
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raise errors.NotABundle(str(e))
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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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return MergeDirective.from_lines(bytef), transport
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except errors.NotAMergeDirective:
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return _serializer.read_bundle(bytef), transport