1
# Copyright (C) 2004, 2005 by Canonical Ltd
3
# This program is free software; you can redistribute it and/or modify
4
# it under the terms of the GNU General Public License as published by
5
# the Free Software Foundation; either version 2 of the License, or
6
# (at your option) any later version.
8
# This program is distributed in the hope that it will be useful,
9
# but WITHOUT ANY WARRANTY; without even the implied warranty of
10
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11
# GNU General Public License for more details.
13
# You should have received a copy of the GNU General Public License
14
# along with this program; if not, write to the Free Software
15
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17
"""Make a copy of an entire branch and all its history.
19
This is the underlying function for the branch/get/clone commands."""
21
# TODO: This could be done *much* more efficiently by just copying
22
# all the whole weaves and revisions, rather than getting one
25
# TODO: Optionally, after copying, discard any irrelevant information from
26
# the destination, such as revisions committed after the last one we're interested
27
# in. This needs to apply a weave prune operation (not written yet) to each
30
# Copying must be done in a way that supports http transports, where we
31
# can't list a directory, and therefore have to rely on information
32
# retrieved from top-level objects whose names we do know.
34
# In practice this means we first fetch the revision history and ancestry.
35
# These give us a list of all the revisions that need to be fetched. We
36
# also get the inventory weave. We then just need to get a list of all
37
# file-ids ever referenced by this tree. (It might be nice to keep a list
38
# of them directly.) This is done by walking over the inventories of all
39
# copied revisions and accumulating a list of file ids.
41
# For local branches it is possible to optimize this considerably in two
42
# ways. One is to hardlink the files (if possible and requested), rather
43
# than copying them. Another is to simply list the directory rather than
44
# walking through the inventories to find out what files are present -- but
45
# there it may be better to just be consistent with remote branches.
51
from bzrlib.merge import build_working_dir
52
from bzrlib.branch import Branch
53
from bzrlib.trace import mutter, note
54
from bzrlib.store import copy_all
56
def copy_branch(branch_from, to_location, revision=None, basis_branch=None):
57
"""Copy branch_from into the existing directory to_location.
59
Returns the newly created branch object.
62
If not None, only revisions up to this point will be copied.
63
The head of the new branch will be that revision. Must be a
66
to_location -- The destination directory; must either exist and be
67
empty, or not exist, in which case it is created.
70
A local branch to copy revisions from, related to branch_from.
71
This is used when branching from a remote (slow) branch, and we have
72
a local branch that might contain some relevant revisions.
74
assert isinstance(branch_from, Branch)
75
assert isinstance(to_location, basestring)
76
if basis_branch is not None:
77
note("basis_branch is not supported for fast weave copy yet.")
78
branch_from.lock_read()
80
if not (branch_from.weave_store.listable()
81
and branch_from.revision_store.listable()):
82
return copy_branch_slower(branch_from, to_location, revision,
84
history = _get_truncated_history(branch_from, revision)
85
if not bzrlib.osutils.lexists(to_location):
87
branch_to = Branch.initialize(to_location)
88
mutter("copy branch from %s to %s", branch_from, branch_to)
89
branch_to.set_root_id(branch_from.get_root_id())
90
branch_to.append_revision(*history)
91
_copy_control_weaves(branch_from, branch_to)
92
_copy_text_weaves(branch_from, branch_to)
93
_copy_revision_store(branch_from, branch_to)
94
build_working_dir(to_location)
95
branch_to.set_parent(branch_from.base)
102
def _get_truncated_history(branch_from, revision):
103
history = branch_from.revision_history()
107
idx = history.index(revision)
109
raise InvalidRevisionId('revision {%s} is not on the mainline of %s'
110
% (revision, branch_from))
111
return history[:idx+1]
113
def _copy_text_weaves(branch_from, branch_to):
114
copy_all(branch_from.weave_store, branch_to.weave_store)
117
def _copy_revision_store(branch_from, branch_to):
118
copy_all(branch_from.revision_store, branch_to.revision_store)
121
def _copy_control_weaves(branch_from, branch_to):
122
to_control = branch_to.control_weaves
123
from_control = branch_from.control_weaves
124
to_control.copy_multi(from_control, ['inventory'])
127
def copy_branch_slower(branch_from, to_location, revision=None, basis_branch=None):
128
"""Copy branch_from into the existing directory to_location.
131
If not None, only revisions up to this point will be copied.
132
The head of the new branch will be that revision. Must be a
135
to_location -- The destination directory; must either exist and be
136
empty, or not exist, in which case it is created.
139
The revision to copy up to
142
A local branch to copy revisions from, related to branch_from.
143
This is used when branching from a remote (slow) branch, and we have
144
a local branch that might contain some relevant revisions.
146
assert isinstance(branch_from, Branch)
147
assert isinstance(to_location, basestring)
148
if not bzrlib.osutils.lexists(to_location):
149
os.mkdir(to_location)
150
br_to = Branch.initialize(to_location)
151
mutter("copy branch from %s to %s", branch_from, br_to)
152
if basis_branch is not None:
153
basis_branch.push_stores(br_to)
154
br_to.set_root_id(branch_from.get_root_id())
156
revision = branch_from.last_revision()
157
br_to.update_revisions(branch_from, stop_revision=revision)
158
build_working_dir(to_location)
159
br_to.set_parent(branch_from.base)
added
removed
bzrlib/clone.py
