1
# Copyright (C) 2006, 2007 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17
# Original author: David Allouche
19
from bzrlib import errors, merge, revision
20
from bzrlib.branch import Branch, BranchFormat, BranchReferenceFormat
21
from bzrlib.bzrdir import BzrDir
22
from bzrlib.trace import note
25
def switch(control_dir, to_branch, force=False, quiet=False):
26
"""Switch the branch associated with a checkout.
28
:param control_dir: BzrDir of the checkout to change
29
:param to_branch: branch that the checkout is to reference
30
:param force: skip the check for local commits in a heavy checkout
32
_check_pending_merges(control_dir, force)
34
source_repository = control_dir.open_branch().repository
35
except errors.NotBranchError:
36
source_repository = to_branch.repository
37
_set_branch_location(control_dir, to_branch, force)
38
tree = control_dir.open_workingtree()
39
_update(tree, source_repository, quiet)
42
def _check_pending_merges(control, force=False):
43
"""Check that there are no outstanding pending merges before switching.
45
:param control: BzrDir of the branch to check
48
tree = control.open_workingtree()
49
except errors.NotBranchError, ex:
50
# Lightweight checkout and branch is no longer there
55
# XXX: Should the tree be locked for get_parent_ids?
56
existing_pending_merges = tree.get_parent_ids()[1:]
57
if len(existing_pending_merges) > 0:
58
raise errors.BzrCommandError('Pending merges must be '
59
'committed or reverted before using switch.')
62
def _set_branch_location(control, to_branch, force=False):
63
"""Set location value of a branch reference.
65
:param control: BzrDir of the checkout to change
66
:param to_branch: branch that the checkout is to reference
67
:param force: skip the check for local commits in a heavy checkout
69
branch_format = control.find_branch_format()
70
if branch_format.get_reference(control) is not None:
71
# Lightweight checkout: update the branch reference
72
branch_format.set_reference(control, to_branch)
74
b = control.open_branch()
75
bound_branch = b.get_bound_location()
76
if bound_branch is not None:
77
# Heavyweight checkout: check all local commits
78
# have been pushed to the current bound branch then
79
# synchronise the local branch with the new remote branch
81
possible_transports = []
83
if not force and _any_local_commits(b, possible_transports):
84
raise errors.BzrCommandError(
85
'Cannot switch as local commits found in the checkout. '
86
'Commit these to the bound branch or use --force to '
88
except errors.BoundBranchConnectionFailure, e:
89
raise errors.BzrCommandError(
90
'Unable to connect to current master branch %(target)s: '
91
'%(error)s To switch anyway, use --force.' %
93
b.set_bound_location(None)
94
b.pull(to_branch, overwrite=True,
95
possible_transports=possible_transports)
96
b.set_bound_location(to_branch.base)
98
raise errors.BzrCommandError('Cannot switch a branch, '
102
def _any_local_commits(this_branch, possible_transports):
103
"""Does this branch have any commits not in the master branch?"""
104
last_rev = revision.ensure_null(this_branch.last_revision())
105
if last_rev != revision.NULL_REVISION:
106
other_branch = this_branch.get_master_branch(possible_transports)
107
this_branch.lock_read()
108
other_branch.lock_read()
110
other_last_rev = other_branch.last_revision()
111
graph = this_branch.repository.get_graph(
112
other_branch.repository)
113
if not graph.is_ancestor(last_rev, other_last_rev):
116
other_branch.unlock()
121
def _update(tree, source_repository, quiet=False):
122
"""Update a working tree to the latest revision of its branch.
124
:param tree: the working tree
125
:param source_repository: repository holding the revisions
127
tree.lock_tree_write()
129
to_branch = tree.branch
130
if tree.last_revision() == to_branch.last_revision():
132
note("Tree is up to date at revision %d.", to_branch.revno())
134
base_tree = source_repository.revision_tree(tree.last_revision())
135
merge.Merge3Merger(tree, tree, base_tree, to_branch.basis_tree())
136
tree.set_last_revision(to_branch.last_revision())
138
note('Updated to revision %d.' % to_branch.revno())
added
removed
bzrlib/switch.py
