/brz/remove-bazaar

# Copyright (C) 2008 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

"""Foreign branch utilities."""

from bzrlib.branch import Branch

from bzrlib.commands import Command, Option

from bzrlib.repository import Repository

from bzrlib.revision import Revision

from bzrlib.lazy_import import lazy_import

lazy_import(globals(), """

from bzrlib import (

    errors,

    osutils,

    registry,

    )

""")

class VcsMapping(object):

    """Describes the mapping between the semantics of Bazaar and a foreign vcs.

    """

    # Whether this is an experimental mapping that is still open to changes.

    experimental = False

    # Whether this mapping supports exporting and importing all bzr semantics.

    roundtripping = False

    # Prefix used when importing native foreign revisions (not roundtripped) 

    # using this mapping.

    revid_prefix = None

    def __init__(self, vcs):

        """Create a new VcsMapping.

        :param vcs: VCS that this mapping maps to Bazaar

        """

        self.vcs = vcs

    def revision_id_bzr_to_foreign(self, bzr_revid):

        """Parse a bzr revision id and convert it to a foreign revid.

        :param bzr_revid: The bzr revision id (a string).

        :return: A foreign revision id, can be any sort of object.

        """

        raise NotImplementedError(self.revision_id_bzr_to_foreign)

    def revision_id_foreign_to_bzr(self, foreign_revid):

        """Parse a foreign revision id and convert it to a bzr revid.

        :param foreign_revid: Foreign revision id, can be any sort of object.

        :return: A bzr revision id.

        """

        raise NotImplementedError(self.revision_id_foreign_to_bzr)

class VcsMappingRegistry(registry.Registry):

    """Registry for Bazaar<->foreign VCS mappings.

    There should be one instance of this registry for every foreign VCS.

    """

    def register(self, key, factory, help):

        """Register a mapping between Bazaar and foreign VCS semantics.

        The factory must be a callable that takes one parameter: the key.

        It must produce an instance of VcsMapping when called.

        """

        if ":" in key:

            raise ValueError("mapping name can not contain colon (:)")

        registry.Registry.register(self, key, factory, help)

    def set_default(self, key):

        """Set the 'default' key to be a clone of the supplied key.

        This method must be called once and only once.

        """

        self._set_default_key(key)

    def get_default(self):

        """Convenience function for obtaining the default mapping to use."""

        return self.get(self._get_default_key())

    def revision_id_bzr_to_foreign(self, revid):

        """Convert a bzr revision id to a foreign revid."""

        raise NotImplementedError(self.revision_id_bzr_to_foreign)

class ForeignRevision(Revision):

    """A Revision from a Foreign repository. Remembers 

    information about foreign revision id and mapping.

    """

    def __init__(self, foreign_revid, mapping, *args, **kwargs):

        if not "inventory_sha1" in kwargs:

            kwargs["inventory_sha1"] = ""

        super(ForeignRevision, self).__init__(*args, **kwargs)

        self.foreign_revid = foreign_revid

        self.mapping = mapping

def show_foreign_properties(rev):

    """Custom log displayer for foreign revision identifiers.

    :param rev: Revision object.

    """

    # Revision comes directly from a foreign repository

    if isinstance(rev, ForeignRevision):

        return rev.mapping.vcs.show_foreign_revid(rev.foreign_revid)

    # Revision was once imported from a foreign repository

    try:

        foreign_revid, mapping = \

            foreign_vcs_registry.parse_revision_id(rev.revision_id)

    except errors.InvalidRevisionId:

        return {}

    return mapping.vcs.show_foreign_revid(foreign_revid)

class ForeignVcs(object):

    """A foreign version control system."""

    def __init__(self, mapping_registry):

        self.mapping_registry = mapping_registry

    def show_foreign_revid(self, foreign_revid):

        """Prepare a foreign revision id for formatting using bzr log.

        :param foreign_revid: Foreign revision id.

        :return: Dictionary mapping string keys to string values.

        """

        return { }

class ForeignVcsRegistry(registry.Registry):

    """Registry for Foreign VCSes.

    There should be one entry per foreign VCS. Example entries would be 

    "git", "svn", "hg", "darcs", etc.

    """

    def register(self, key, foreign_vcs, help):

        """Register a foreign VCS.

        :param key: Prefix of the foreign VCS in revision ids

        :param foreign_vcs: ForeignVCS instance

        :param help: Description of the foreign VCS

        """

        if ":" in key or "-" in key:

            raise ValueError("vcs name can not contain : or -")

        registry.Registry.register(self, key, foreign_vcs, help)

    def parse_revision_id(self, revid):

        """Parse a bzr revision and return the matching mapping and foreign 

        revid.

        :param revid: The bzr revision id

        :return: tuple with foreign revid and vcs mapping

        """

        if not "-" in revid:

            raise errors.InvalidRevisionId(revid, None)

        try:

            foreign_vcs = self.get(revid.split("-")[0])

        except KeyError:

            raise errors.InvalidRevisionId(revid, None)

        return foreign_vcs.mapping_registry.revision_id_bzr_to_foreign(revid)

foreign_vcs_registry = ForeignVcsRegistry()

class ForeignRepository(Repository):

    """A Repository that exists in a foreign version control system.

    The data in this repository can not be represented natively using 

    Bazaars internal datastructures, but have to converted using a VcsMapping.

    """

    # This repository's native version control system

    vcs = None

    def has_foreign_revision(self, foreign_revid):

        """Check whether the specified foreign revision is present.

        :param foreign_revid: A foreign revision id, in the format used 

                              by this Repository's VCS.

        """

        raise NotImplementedError(self.has_foreign_revision)

    def lookup_bzr_revision_id(self, revid):

        """Lookup a mapped or roundtripped revision by revision id.

        :param revid: Bazaar revision id

        :return: Tuple with foreign revision id and mapping.

        """

        raise NotImplementedError(self.lookup_revision_id)

    def all_revision_ids(self, mapping=None):

        """See Repository.all_revision_ids()."""

        raise NotImplementedError(self.all_revision_ids)

    def get_default_mapping(self):

        """Get the default mapping for this repository."""

        raise NotImplementedError(self.get_default_mapping)

    def get_inventory_xml(self, revision_id):

        """See Repository.get_inventory_xml()."""

        return self.serialise_inventory(self.get_inventory(revision_id))

    def get_inventory_sha1(self, revision_id):

        """Get the sha1 for the XML representation of an inventory.

        :param revision_id: Revision id of the inventory for which to return 

         the SHA1.

        :return: XML string

        """

        return osutils.sha_string(self.get_inventory_xml(revision_id))

    def get_revision_xml(self, revision_id):

        """Return the XML representation of a revision.

        :param revision_id: Revision for which to return the XML.

        :return: XML string

        """

        return self._serializer.write_revision_to_string(

            self.get_revision(revision_id))

class ForeignBranch(Branch):

    """Branch that exists in a foreign version control system."""

    def __init__(self, mapping):

        self.mapping = mapping

        super(ForeignBranch, self).__init__()

    def dpull(self, source, stop_revision=None):

        """Pull deltas from another branch.

        :note: This does not, like pull, retain the revision ids from 

            the source branch and will, rather than adding bzr-specific 

            metadata, push only those semantics of the revision that can be 

            natively represented by this branch' VCS.

        :param source: Source branch

        :param stop_revision: Revision to pull, defaults to last revision.

        """

        raise NotImplementedError(self.dpull)

def determine_fileid_renames(old_inv, new_inv):

    """Determine the file ids based on a old and a new inventory that 

    are equal in content.

    :param old_inv: Old inventory

    :param new_inv: New inventory

    :return: Dictionary a (old_id, new_id) tuple for each path in the 

        inventories.

    """

    ret = {}

    if len(old_inv) != len(new_inv):

        raise AssertionError("Inventories are not of the same size")

    for old_file_id in old_inv:

        new_file_id = new_inv.path2id(old_inv.id2path(old_file_id))

        if new_file_id is None:

            raise AssertionError(

                "Unable to find %s in new inventory" % old_file_id)

        if new_file_id != old_file_id:

            ret[new_inv.id2path(new_file_id)] = (old_file_id, new_file_id)

    return ret

def update_workinginv_fileids(wt, old_inv, new_inv):

    """Update all file ids in wt according to old_tree/new_tree. 

    old_tree and new_tree should be two RevisionTree's that differ only

    in file ids.

    """

    fileid_renames = determine_fileid_renames(old_inv, new_inv)

    old_fileids = []

    new_fileids = []

    new_root_id = None

    # Adjust file ids in working tree

    # Sorted, so we process parents before children

    for path in sorted(fileid_renames.keys(), reverse=True):

        if path != "":

            old_fileids.append(fileid_renames[path][0])

            new_fileids.append((path, fileid_renames[path][1]))

        else:

            new_root_id = fileid_renames[path][1]

    new_fileids.reverse()

    wt.unversion(old_fileids)

    if new_root_id is not None:

        wt.set_root_id(new_root_id)

    wt.add([x[0] for x in new_fileids], [x[1] for x in new_fileids])

    wt.set_last_revision(new_inv.revision_id)

class cmd_dpush(Command):

    """Push diffs into a foreign version control system without any 

    Bazaar-specific metadata.

    This will afterwards rebase the local Bazaar branch on the remote

    branch unless the --no-rebase option is used, in which case 

    the two branches will be out of sync. 

    """

    takes_args = ['location?']

    takes_options = ['remember', Option('directory',

            help='Branch to push from, '

                 'rather than the one containing the working directory.',

            short_name='d',

            type=unicode,

            ),

            Option('no-rebase', help="Don't rebase after push")]

    def run(self, location=None, remember=False, directory=None, 

            no_rebase=False):

        from bzrlib import urlutils

        from bzrlib.bzrdir import BzrDir

        from bzrlib.errors import BzrCommandError, NoWorkingTree

        from bzrlib.trace import info

        from bzrlib.workingtree import WorkingTree

        if directory is None:

            directory = "."

        try:

            source_wt = WorkingTree.open_containing(directory)[0]

            source_branch = source_wt.branch

        except NoWorkingTree:

            source_branch = Branch.open_containing(directory)[0]

            source_wt = None

        stored_loc = source_branch.get_push_location()

        if location is None:

            if stored_loc is None:

                raise BzrCommandError("No push location known or specified.")

            else:

                display_url = urlutils.unescape_for_display(stored_loc,

                        self.outf.encoding)

                self.outf.write("Using saved location: %s\n" % display_url)

                location = stored_loc

        bzrdir = BzrDir.open(location)

        target_branch = bzrdir.open_branch()

        target_branch.lock_write()

        try:

            if not isinstance(target_branch, ForeignBranch):

                info("target branch is not a foreign branch, using regular push.")

                target_branch.pull(source_branch)

                no_rebase = True

            else:

                revid_map = target_branch.dpull(source_branch)

            # We successfully created the target, remember it

            if source_branch.get_push_location() is None or remember:

                source_branch.set_push_location(target_branch.base)

            if not no_rebase:

                _, old_last_revid = source_branch.last_revision_info()

                new_last_revid = revid_map[old_last_revid]

                if source_wt is not None:

                    source_wt.pull(target_branch, overwrite=True, 

                                   stop_revision=new_last_revid)

                    source_wt.lock_write()

                    try:

                        update_workinginv_fileids(source_wt, 

                            source_wt.branch.repository.revision_tree(old_last_revid),

                            source_wt.branch.repository.revision_tree(new_last_revid))

                    finally:

                        source_wt.unlock()

                else:

                    source_branch.pull(target_branch, overwrite=True, 

                                       stop_revision=new_last_revid)

        finally:

            target_branch.unlock()