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  • Committer: Robert Collins
  • Date: 2010-05-06 11:08:10 UTC
  • mto: This revision was merged to the branch mainline in revision 5223.
  • Revision ID: robertc@robertcollins.net-20100506110810-h3j07fh5gmw54s25
Cleaner matcher matching revised unlocking protocol.

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# Copyright (C) 2007, 2009-2012 Canonical Ltd.
 
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# Copyright (C) 2007, 2009, 2010 Canonical Ltd.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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17
 
from __future__ import absolute_import
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# Original author: David Allouche
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18
 
21
 
from . import (
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    errors,
23
 
    lock,
24
 
    merge,
25
 
    revision
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    )
27
 
from .branch import Branch
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from .i18n import gettext
29
 
from .trace import note
 
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from bzrlib import errors, merge, revision
 
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from bzrlib.branch import Branch
 
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from bzrlib.trace import note
 
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30
23
 
31
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def _run_post_switch_hooks(control_dir, to_branch, force, revision_id):
32
 
    from .branch import SwitchHookParams
 
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    from bzrlib.branch import SwitchHookParams
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    hooks = Branch.hooks['post_switch']
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27
    if not hooks:
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        return
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    for hook in hooks:
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        hook(params)
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32
 
40
 
def switch(control_dir, to_branch, force=False, quiet=False, revision_id=None,
41
 
           store_uncommitted=False):
 
33
def switch(control_dir, to_branch, force=False, quiet=False, revision_id=None):
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    """Switch the branch associated with a checkout.
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35
 
44
 
    :param control_dir: ControlDir of the checkout to change
 
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    :param control_dir: BzrDir of the checkout to change
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    :param to_branch: branch that the checkout is to reference
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    :param force: skip the check for local commits in a heavy checkout
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    :param revision_id: revision ID to switch to.
48
 
    :param store_uncommitted: If True, store uncommitted changes in the
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        branch.
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    """
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    _check_pending_merges(control_dir, force)
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    try:
53
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        source_repository = control_dir.open_branch().repository
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    except errors.NotBranchError:
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        source_repository = to_branch.repository
56
 
    if store_uncommitted:
57
 
        with lock.write_locked(control_dir.open_workingtree()) as tree:
58
 
            tree.store_uncommitted()
59
 
    with to_branch.lock_read():
60
 
        _set_branch_location(control_dir, to_branch, force)
 
46
    _set_branch_location(control_dir, to_branch, force)
61
47
    tree = control_dir.open_workingtree()
62
 
    _update(tree, source_repository, quiet, revision_id, store_uncommitted)
 
48
    _update(tree, source_repository, quiet, revision_id)
63
49
    _run_post_switch_hooks(control_dir, to_branch, force, revision_id)
64
50
 
65
51
def _check_pending_merges(control, force=False):
66
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    """Check that there are no outstanding pending merges before switching.
67
53
 
68
 
    :param control: ControlDir of the branch to check
 
54
    :param control: BzrDir of the branch to check
69
55
    """
70
56
    try:
71
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        tree = control.open_workingtree()
72
 
    except errors.NotBranchError as ex:
 
58
    except errors.NotBranchError, ex:
73
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        # Lightweight checkout and branch is no longer there
74
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        if force:
75
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            return
78
64
    # XXX: Should the tree be locked for get_parent_ids?
79
65
    existing_pending_merges = tree.get_parent_ids()[1:]
80
66
    if len(existing_pending_merges) > 0:
81
 
        raise errors.BzrCommandError(gettext('Pending merges must be '
82
 
            'committed or reverted before using switch.'))
 
67
        raise errors.BzrCommandError('Pending merges must be '
 
68
            'committed or reverted before using switch.')
83
69
 
84
70
 
85
71
def _set_branch_location(control, to_branch, force=False):
86
72
    """Set location value of a branch reference.
87
73
 
88
 
    :param control: ControlDir of the checkout to change
 
74
    :param control: BzrDir of the checkout to change
89
75
    :param to_branch: branch that the checkout is to reference
90
76
    :param force: skip the check for local commits in a heavy checkout
91
77
    """
92
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    branch_format = control.find_branch_format()
93
79
    if branch_format.get_reference(control) is not None:
94
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        # Lightweight checkout: update the branch reference
95
 
        branch_format.set_reference(control, None, to_branch)
 
81
        branch_format.set_reference(control, to_branch)
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    else:
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        b = control.open_branch()
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        bound_branch = b.get_bound_location()
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            possible_transports = []
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            try:
106
92
                if not force and _any_local_commits(b, possible_transports):
107
 
                    raise errors.BzrCommandError(gettext(
 
93
                    raise errors.BzrCommandError(
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                        'Cannot switch as local commits found in the checkout. '
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                        'Commit these to the bound branch or use --force to '
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                        'throw them away.'))
111
 
            except errors.BoundBranchConnectionFailure as e:
112
 
                raise errors.BzrCommandError(gettext(
 
96
                        'throw them away.')
 
97
            except errors.BoundBranchConnectionFailure, e:
 
98
                raise errors.BzrCommandError(
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                        'Unable to connect to current master branch %(target)s: '
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                        '%(error)s To switch anyway, use --force.') %
 
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                        '%(error)s To switch anyway, use --force.' %
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101
                        e.__dict__)
116
 
            b.lock_write()
117
 
            try:
118
 
                b.set_bound_location(None)
119
 
                b.pull(to_branch, overwrite=True,
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                       possible_transports=possible_transports)
121
 
                b.set_bound_location(to_branch.base)
122
 
                b.set_parent(b.get_master_branch().get_parent())
123
 
            finally:
124
 
                b.unlock()
 
102
            b.set_bound_location(None)
 
103
            b.pull(to_branch, overwrite=True,
 
104
                possible_transports=possible_transports)
 
105
            b.set_bound_location(to_branch.base)
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106
        else:
126
 
            # If this is a standalone tree and the new branch
127
 
            # is derived from this one, create a lightweight checkout.
128
 
            with b.lock_read():
129
 
                graph = b.repository.get_graph(to_branch.repository)
130
 
                if (b.controldir._format.colocated_branches and
131
 
                     (force or graph.is_ancestor(b.last_revision(),
132
 
                        to_branch.last_revision()))):
133
 
                    b.controldir.destroy_branch()
134
 
                    b.controldir.set_branch_reference(to_branch, name="")
135
 
                else:
136
 
                    raise errors.BzrCommandError(gettext('Cannot switch a branch, '
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                        'only a checkout.'))
 
107
            raise errors.BzrCommandError('Cannot switch a branch, '
 
108
                'only a checkout.')
138
109
 
139
110
 
140
111
def _any_local_commits(this_branch, possible_transports):
142
113
    last_rev = revision.ensure_null(this_branch.last_revision())
143
114
    if last_rev != revision.NULL_REVISION:
144
115
        other_branch = this_branch.get_master_branch(possible_transports)
145
 
        with this_branch.lock_read(), other_branch.lock_read():
 
116
        this_branch.lock_read()
 
117
        other_branch.lock_read()
 
118
        try:
146
119
            other_last_rev = other_branch.last_revision()
147
120
            graph = this_branch.repository.get_graph(
148
121
                other_branch.repository)
149
122
            if not graph.is_ancestor(last_rev, other_last_rev):
150
123
                return True
 
124
        finally:
 
125
            other_branch.unlock()
 
126
            this_branch.unlock()
151
127
    return False
152
128
 
153
129
 
154
 
def _update(tree, source_repository, quiet=False, revision_id=None,
155
 
            restore_uncommitted=False):
 
130
def _update(tree, source_repository, quiet=False, revision_id=None):
156
131
    """Update a working tree to the latest revision of its branch.
157
132
 
158
133
    :param tree: the working tree
159
134
    :param source_repository: repository holding the revisions
160
 
    :param restore_uncommitted: restore any uncommitted changes in the branch.
161
135
    """
162
 
    if restore_uncommitted:
163
 
        tree.lock_write()
164
 
    else:
165
 
        tree.lock_tree_write()
 
136
    tree.lock_tree_write()
166
137
    try:
167
138
        to_branch = tree.branch
168
139
        if revision_id is None:
169
140
            revision_id = to_branch.last_revision()
170
141
        if tree.last_revision() == revision_id:
171
142
            if not quiet:
172
 
                note(gettext("Tree is up to date at revision %d."), to_branch.revno())
173
 
        else:
174
 
            base_tree = source_repository.revision_tree(tree.last_revision())
175
 
            merge.Merge3Merger(tree, tree, base_tree,
176
 
                               to_branch.repository.revision_tree(revision_id))
177
 
            tree.set_last_revision(to_branch.last_revision())
178
 
            if not quiet:
179
 
                note(gettext('Updated to revision %d.') % to_branch.revno())
180
 
        if restore_uncommitted:
181
 
            tree.restore_uncommitted()
 
143
                note("Tree is up to date at revision %d.", to_branch.revno())
 
144
            return
 
145
        base_tree = source_repository.revision_tree(tree.last_revision())
 
146
        merge.Merge3Merger(tree, tree, base_tree, to_branch.repository.revision_tree(revision_id))
 
147
        tree.set_last_revision(to_branch.last_revision())
 
148
        if not quiet:
 
149
            note('Updated to revision %d.' % to_branch.revno())
182
150
    finally:
183
151
        tree.unlock()