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# Copyright (C) 2005-2010 Canonical Ltd
#
# 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
from cStringIO import StringIO
from bzrlib.lazy_import import lazy_import
lazy_import(globals(), """
from bzrlib import (
errors,
transport as _mod_transport,
urlutils,
)
from bzrlib.bundle import serializer as _serializer
from bzrlib.merge_directive import MergeDirective
""")
from bzrlib.trace import note
def read_mergeable_from_url(url, _do_directive=True, possible_transports=None):
"""Read mergable object from a given URL.
:return: An object supporting get_target_revision. Raises NotABundle if
the target is not a mergeable type.
"""
child_transport = _mod_transport.get_transport(url,
possible_transports=possible_transports)
transport = child_transport.clone('..')
filename = transport.relpath(child_transport.base)
mergeable, transport = read_mergeable_from_transport(transport, filename,
_do_directive)
return mergeable
def read_mergeable_from_transport(transport, filename, _do_directive=True):
def get_bundle(transport):
return StringIO(transport.get_bytes(filename)), transport
def redirected_transport(transport, exception, redirection_notice):
note(redirection_notice)
url, filename = urlutils.split(exception.target,
exclude_trailing_slash=False)
if not filename:
raise errors.NotABundle('A directory cannot be a bundle')
return _mod_transport.get_transport(url)
try:
bytef, transport = _mod_transport.do_catching_redirections(
get_bundle, transport, redirected_transport)
except errors.TooManyRedirections:
raise errors.NotABundle(transport.clone(filename).base)
except (errors.ConnectionReset, errors.ConnectionError), e:
raise
except (errors.TransportError, errors.PathError), e:
raise errors.NotABundle(str(e))
except (IOError,), e:
# jam 20060707
# Abstraction leakage, SFTPTransport.get('directory')
# doesn't always fail at get() time. Sometimes it fails
# during read. And that raises a generic IOError with
# just the string 'Failure'
# StubSFTPServer does fail during get() (because of prefetch)
# so it has an opportunity to translate the error.
raise errors.NotABundle(str(e))
if _do_directive:
try:
return MergeDirective.from_lines(bytef), transport
except errors.NotAMergeDirective:
bytef.seek(0)
return _serializer.read_bundle(bytef), transport
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