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# 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 os
from cStringIO import StringIO
import bzrlib.errors
from bzrlib.trace import mutter, note, warning
from bzrlib.branch import Branch, INVENTORY_FILEID, ANCESTRY_FILEID
from bzrlib.progress import ProgressBar
from bzrlib.xml5 import serializer_v5
from bzrlib.osutils import sha_string, split_lines
from bzrlib.errors import NoSuchRevision
"""Copying of history from one branch to another.
The basic plan is that every branch knows the history of everything
that has merged into it. As the first step of a merge, pull, or
branch operation we copy history from the source into the destination
branch.
The copying is done in a slightly complicated order. We don't want to
add a revision to the store until everything it refers to is also
stored, so that if a revision is present we can totally recreate it.
However, we can't know what files are included in a revision until we
read its inventory. Therefore, we first pull the XML and hold it in
memory until we've updated all of the files referenced.
"""
# TODO: Avoid repeatedly opening weaves so many times.
# XXX: This doesn't handle ghost (not present in branch) revisions at
# all yet. I'm not sure they really should be supported.
# TODO: This doesn't handle revisions which may be present but not
# merged into the last revision.
# - get a list of revisions that need to be pulled in
# - for each one, pull in that revision file
# and get the inventory, and store the inventory with right
# parents.
# - and get the ancestry, and store that with right parents too
# - and keep a note of all file ids and version seen
# - then go through all files; for each one get the weave,
# and add in all file versions
def greedy_fetch(to_branch, from_branch, revision, pb):
f = Fetcher(to_branch, from_branch, revision, pb)
return f.count_copied, f.failed_revisions
class Fetcher(object):
"""Pull history from one branch to another.
revision_limit
If set, pull only up to this revision_id.
"""
def __init__(self, to_branch, from_branch, revision_limit=None, pb=None):
self.to_branch = to_branch
self.from_branch = from_branch
self.failed_revisions = []
self.count_copied = 0
self.count_total = 0
if pb is None:
self.pb = bzrlib.ui.ui_factory.progress_bar()
else:
self.pb = pb
self.revision_limit = self._find_revision_limit(revision_limit)
revs_to_fetch = self._compare_ancestries()
self._copy_revisions(revs_to_fetch)
def _find_revision_limit(self, revision_limit):
"""Find the limiting source revision.
Every ancestor of that revision will be merged across.
Returns the revision_id, or returns None if there's no history
in the source branch."""
self.pb.update('get source history')
from_history = self.from_branch.revision_history()
self.pb.update('get destination history')
if revision_limit:
if revision_limit not in from_history:
raise NoSuchRevision(self.from_branch, revision_limit)
else:
return revision_limit
elif from_history:
return from_history[-1]
else:
return None # no history in the source branch
def _compare_ancestries(self):
"""Get a list of revisions that must be copied.
That is, every revision that's in the ancestry of the source
branch and not in the destination branch."""
self.pb.update('get source ancestry')
self.from_ancestry = self.from_branch.get_ancestry(self.revision_limit)
dest_last_rev = self.to_branch.last_revision()
self.pb.update('get destination ancestry')
if dest_last_rev:
dest_ancestry = self.to_branch.get_ancestry(dest_last_rev)
else:
dest_ancestry = []
ss = set(dest_ancestry)
to_fetch = []
for rev_id in self.from_ancestry:
if rev_id not in ss:
to_fetch.append(rev_id)
mutter('need to get revision {%s}', rev_id)
mutter('need to get %d revisions in total', len(to_fetch))
self.count_total = len(to_fetch)
return to_fetch
def _copy_revisions(self, revs_to_fetch):
i = 0
for rev_id in revs_to_fetch:
self.pb.update('fetch revision', i, self.count_total)
self._copy_one_revision(rev_id)
i += 1
def _copy_one_revision(self, rev_id):
"""Copy revision and everything referenced by it."""
mutter('copying revision {%s}', rev_id)
rev_xml = self.from_branch.get_revision_xml(rev_id)
inv_xml = self.from_branch.get_inventory_xml(rev_id)
rev = serializer_v5.read_revision_from_string(rev_xml)
inv = serializer_v5.read_inventory_from_string(inv_xml)
assert rev.revision_id == rev_id
assert rev.inventory_sha1 == sha_string(inv_xml)
mutter(' commiter %s, %d parents',
rev.committer,
len(rev.parents))
self._copy_new_texts(rev_id, inv)
self.to_branch.weave_store.add_text(INVENTORY_FILEID, rev_id,
split_lines(inv_xml), rev.parents)
self.to_branch.revision_store.add(StringIO(rev_xml), rev_id)
def _copy_new_texts(self, rev_id, inv):
"""Copy any new texts occuring in this revision."""
# TODO: Rather than writing out weaves every time, hold them
# in memory until everything's done? But this way is nicer
# if it's interrupted.
for path, ie in inv.iter_entries():
if ie.kind != 'file':
continue
if ie.text_version != rev_id:
continue
mutter('%s {%s} is changed in this revision',
path, ie.file_id)
self._copy_one_text(rev_id, ie.file_id)
def _copy_one_text(self, rev_id, file_id):
"""Copy one file text."""
from_weave = self.from_branch.weave_store.get_weave(file_id)
from_idx = from_weave.lookup(rev_id)
from_parents = map(from_weave.idx_to_name, from_weave.parents(from_idx))
text_lines = from_weave.get(from_idx)
to_weave = self.to_branch.weave_store.get_weave_or_empty(file_id)
to_parents = map(to_weave.lookup, from_parents)
# it's ok to add even if the text is already there
to_weave.add(rev_id, to_parents, text_lines)
self.to_branch.weave_store.put_weave(file_id, to_weave)
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