~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2005 by 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

import bzrlib.errors

from bzrlib.trace import mutter, note

from bzrlib.branch import Branch

from bzrlib.progress import ProgressBar

import sys

import os

def has_revision(branch, revision_id):

    try:

        branch.get_revision_xml(revision_id)

        return True

    except bzrlib.errors.NoSuchRevision:

        return False

def greedy_fetch(to_branch, from_branch, revision=None, pb=None):

    """Copy a revision and all available ancestors from one branch to another

    If no revision is specified, uses the last revision in the source branch's

    revision history.

    """

    from_history = from_branch.revision_history()

    required_revisions = set(from_history)

    all_failed = set()

    if revision is not None:

        required_revisions.add(revision)

        try:

            rev_index = from_history.index(revision)

        except ValueError:

            rev_index = None

        if rev_index is not None:

            from_history = from_history[:rev_index + 1]

        else:

            from_history = [revision]

    to_history = to_branch.revision_history()

    missing = []

    for rev_id in from_history:

        if not has_revision(to_branch, rev_id):

            missing.append(rev_id)

    count = 0

    while len(missing) > 0:

        installed, failed = to_branch.install_revisions(from_branch, 

                                                        revision_ids=missing,

                                                        pb=pb)

        count += installed

        required_failed = failed.intersection(required_revisions)

        if len(required_failed) > 0:

            raise bzrlib.errors.InstallFailed(required_failed)

        for rev_id in failed:

            note("Failed to install %s" % rev_id)

        all_failed.update(failed)

        new_missing = set() 

        for rev_id in missing:

            try:

                revision = from_branch.get_revision(rev_id)

            except bzrlib.errors.NoSuchRevision:

                if revision in from_history:

                    raise

                else:

                    continue

            for parent in [p.revision_id for p in revision.parents]:

                if not has_revision(to_branch, parent):

                    new_missing.add(parent)

        missing = new_missing

    return count, all_failed