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  • Committer: Canonical.com Patch Queue Manager
  • Date: 2008-10-31 04:39:04 UTC
  • mfrom: (3565.6.16 switch_nick)
  • Revision ID: pqm@pqm.ubuntu.com-20081031043904-52fnbfrloojemvcc
(mbp) branch nickname documentation

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bzrlib/bundle/__init__.py
 
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# Copyright (C) 2005, 2006 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
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from bzrlib.lazy_import import lazy_import
 
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lazy_import(globals(), """
 
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from bzrlib import (
 
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    errors,
 
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    urlutils,
 
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    )
 
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from bzrlib.bundle import serializer as _serializer
 
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from bzrlib.transport import (
 
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    do_catching_redirections,
 
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    get_transport,
 
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    )
 
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""")
 
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from bzrlib.trace import note
 
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def read_bundle_from_url(url):
 
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    return read_mergeable_from_url(url, _do_directive=False)
 
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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 = 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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    if filename.endswith('/'):
 
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        # A path to a directory was passed in
 
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        # definitely not a bundle
 
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        raise errors.NotABundle('A directory cannot be a bundle')
 
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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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    # All of this must be in the try/except
 
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    # Some transports cannot detect that we are trying to read a
 
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    # directory until we actually issue read() on the handle.
 
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    try:
 
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        def get_bundle(transport):
 
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            return transport.get(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('A directory cannot be a bundle')
 
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            return get_transport(url)
 
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        try:
 
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            f, transport = do_catching_redirections(get_bundle, transport,
 
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                                                    redirected_transport)
 
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        except errors.TooManyRedirections:
 
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            raise errors.NotABundle(str(url))
 
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        if _do_directive:
 
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            from bzrlib.merge_directive import MergeDirective
 
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            directive = MergeDirective.from_lines(f.readlines())
 
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            return directive, transport
 
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        else:
 
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            return _serializer.read_bundle(f), transport
 
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    except errors.ConnectionReset:
 
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        raise
 
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    except (errors.TransportError, errors.PathError), e:
 
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        raise errors.NotABundle(str(e))
 
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    except (IOError,), 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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    except errors.NotAMergeDirective:
 
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        f.seek(0)
 
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        return _serializer.read_bundle(f), transport