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Viewing changes to bzrlib/bundle/__init__.py

  • Committer: Martin Pool
  • Date: 2005-05-06 02:34:54 UTC
  • Revision ID: mbp@sourcefrog.net-20050506023454-7118a1b22e8515bc
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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