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  • Committer: Jelmer Vernooij
  • Date: 2020-04-05 19:11:34 UTC
  • mto: (7490.7.16 work)
  • mto: This revision was merged to the branch mainline in revision 7501.
  • Revision ID: jelmer@jelmer.uk-20200405191134-0aebh8ikiwygxma5
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breezy/switch.py
1
 
# Copyright (C) 2007, 2009, 2010 Canonical Ltd.
 
1
# Copyright (C) 2007, 2009-2012 Canonical Ltd.
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2
#
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3
# 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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15
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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16
 
 
17
from __future__ import absolute_import
 
18
 
17
19
# Original author: David Allouche
18
20
 
19
 
from bzrlib import errors, merge, revision
20
 
from bzrlib.branch import Branch
21
 
from bzrlib.trace import note
 
21
from . import (
 
22
    errors,
 
23
    lock,
 
24
    merge,
 
25
    revision
 
26
    )
 
27
from .branch import Branch
 
28
from .i18n import gettext
 
29
from .trace import note
22
30
 
23
31
 
24
32
def _run_post_switch_hooks(control_dir, to_branch, force, revision_id):
25
 
    from bzrlib.branch import SwitchHookParams
 
33
    from .branch import SwitchHookParams
26
34
    hooks = Branch.hooks['post_switch']
27
35
    if not hooks:
28
36
        return
30
38
    for hook in hooks:
31
39
        hook(params)
32
40
 
33
 
def switch(control_dir, to_branch, force=False, quiet=False, revision_id=None):
 
41
 
 
42
def switch(control_dir, to_branch, force=False, quiet=False, revision_id=None,
 
43
           store_uncommitted=False, possible_transports=None):
34
44
    """Switch the branch associated with a checkout.
35
45
 
36
 
    :param control_dir: BzrDir of the checkout to change
 
46
    :param control_dir: ControlDir of the checkout to change
37
47
    :param to_branch: branch that the checkout is to reference
38
48
    :param force: skip the check for local commits in a heavy checkout
39
49
    :param revision_id: revision ID to switch to.
40
 
    """
41
 
    _check_pending_merges(control_dir, force)
42
 
    try:
43
 
        source_repository = control_dir.open_branch().repository
44
 
    except errors.NotBranchError:
45
 
        source_repository = to_branch.repository
46
 
    _set_branch_location(control_dir, to_branch, force)
47
 
    tree = control_dir.open_workingtree()
48
 
    _update(tree, source_repository, quiet, revision_id)
49
 
    _run_post_switch_hooks(control_dir, to_branch, force, revision_id)
50
 
 
51
 
def _check_pending_merges(control, force=False):
52
 
    """Check that there are no outstanding pending merges before switching.
53
 
 
54
 
    :param control: BzrDir of the branch to check
55
 
    """
56
 
    try:
57
 
        tree = control.open_workingtree()
58
 
    except errors.NotBranchError, ex:
 
50
    :param store_uncommitted: If True, store uncommitted changes in the
 
51
        branch.
 
52
    """
 
53
    try:
 
54
        tree = control_dir.open_workingtree()
 
55
    except errors.NotBranchError as ex:
59
56
        # Lightweight checkout and branch is no longer there
60
 
        if force:
61
 
            return
62
 
        else:
 
57
        if not force or store_uncommitted:
63
58
            raise ex
64
 
    # XXX: Should the tree be locked for get_parent_ids?
65
 
    existing_pending_merges = tree.get_parent_ids()[1:]
66
 
    if len(existing_pending_merges) > 0:
67
 
        raise errors.BzrCommandError('Pending merges must be '
68
 
            'committed or reverted before using switch.')
69
 
 
70
 
 
71
 
def _set_branch_location(control, to_branch, force=False):
 
59
        else:
 
60
            tree = None
 
61
    else:
 
62
        if store_uncommitted or tree.branch.get_bound_location():
 
63
            tree.lock_write()
 
64
        else:
 
65
            tree.lock_tree_write()
 
66
    try:
 
67
        if tree is not None:
 
68
            parent_ids = tree.get_parent_ids()
 
69
            if len(parent_ids) > 1:
 
70
                raise errors.BzrCommandError(
 
71
                    gettext('Pending merges must be '
 
72
                            'committed or reverted before using switch.'))
 
73
 
 
74
        if store_uncommitted:
 
75
            tree.store_uncommitted()
 
76
        if tree is None:
 
77
            source_repository = to_branch.repository
 
78
            base_revision_id = None
 
79
        else:
 
80
            source_repository = tree.branch.repository
 
81
            # Attempt to retrieve the base_revision_id now, since some
 
82
            # working tree formats (i.e. git) don't have their own
 
83
            # last_revision but just use that of the currently active branch.
 
84
            base_revision_id = tree.last_revision()
 
85
    finally:
 
86
        if tree is not None:
 
87
            tree.unlock()
 
88
    with to_branch.lock_read():
 
89
        _set_branch_location(control_dir, to_branch, tree.branch if tree else None, force)
 
90
    tree = control_dir.open_workingtree()
 
91
    if store_uncommitted:
 
92
        tree.lock_write()
 
93
    else:
 
94
        tree.lock_tree_write()
 
95
    try:
 
96
        if base_revision_id is None:
 
97
            # If we couldn't get to the tree's last_revision earlier, perhaps
 
98
            # we can now.
 
99
            base_revision_id = tree.last_revision()
 
100
        if revision_id is None:
 
101
            revision_id = to_branch.last_revision()
 
102
        if base_revision_id == revision_id:
 
103
            if not quiet:
 
104
                note(gettext("Tree is up to date at revision %d."),
 
105
                     to_branch.revno())
 
106
        else:
 
107
            base_tree = source_repository.revision_tree(base_revision_id)
 
108
            target_tree = to_branch.repository.revision_tree(revision_id)
 
109
            merge.Merge3Merger(tree, tree, base_tree, target_tree)
 
110
            tree.set_last_revision(revision_id)
 
111
            if not quiet:
 
112
                note(gettext('Updated to revision %d.') % to_branch.revno())
 
113
        if store_uncommitted:
 
114
            tree.restore_uncommitted()
 
115
        _run_post_switch_hooks(control_dir, to_branch, force, revision_id)
 
116
    finally:
 
117
        tree.unlock()
 
118
 
 
119
 
 
120
def _set_branch_location(control, to_branch, current_branch, force=False):
72
121
    """Set location value of a branch reference.
73
122
 
74
 
    :param control: BzrDir of the checkout to change
 
123
    :param control: ControlDir of the checkout to change
75
124
    :param to_branch: branch that the checkout is to reference
76
125
    :param force: skip the check for local commits in a heavy checkout
77
126
    """
78
127
    branch_format = control.find_branch_format()
79
128
    if branch_format.get_reference(control) is not None:
80
129
        # Lightweight checkout: update the branch reference
81
 
        branch_format.set_reference(control, to_branch)
 
130
        branch_format.set_reference(control, None, to_branch)
82
131
    else:
83
 
        b = control.open_branch()
 
132
        b = current_branch
84
133
        bound_branch = b.get_bound_location()
85
134
        if bound_branch is not None:
86
135
            # Heavyweight checkout: check all local commits
90
139
            possible_transports = []
91
140
            try:
92
141
                if not force and _any_local_commits(b, possible_transports):
93
 
                    raise errors.BzrCommandError(
 
142
                    raise errors.BzrCommandError(gettext(
94
143
                        'Cannot switch as local commits found in the checkout. '
95
144
                        'Commit these to the bound branch or use --force to '
96
 
                        'throw them away.')
97
 
            except errors.BoundBranchConnectionFailure, e:
98
 
                raise errors.BzrCommandError(
99
 
                        'Unable to connect to current master branch %(target)s: '
100
 
                        '%(error)s To switch anyway, use --force.' %
101
 
                        e.__dict__)
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)
 
145
                        'throw them away.'))
 
146
            except errors.BoundBranchConnectionFailure as e:
 
147
                raise errors.BzrCommandError(gettext(
 
148
                    'Unable to connect to current master branch %(target)s: '
 
149
                    '%(error)s To switch anyway, use --force.') %
 
150
                    e.__dict__)
 
151
            with b.lock_write():
 
152
                b.set_bound_location(None)
 
153
                b.pull(to_branch, overwrite=True,
 
154
                       possible_transports=possible_transports)
 
155
                b.set_bound_location(to_branch.base)
 
156
                b.set_parent(b.get_master_branch().get_parent())
106
157
        else:
107
 
            raise errors.BzrCommandError('Cannot switch a branch, '
108
 
                'only a checkout.')
 
158
            # If this is a standalone tree and the new branch
 
159
            # is derived from this one, create a lightweight checkout.
 
160
            with b.lock_read():
 
161
                graph = b.repository.get_graph(to_branch.repository)
 
162
                if (b.controldir._format.colocated_branches and
 
163
                    (force or graph.is_ancestor(
 
164
                        b.last_revision(), to_branch.last_revision()))):
 
165
                    b.controldir.destroy_branch()
 
166
                    b.controldir.set_branch_reference(to_branch, name="")
 
167
                else:
 
168
                    raise errors.BzrCommandError(
 
169
                        gettext('Cannot switch a branch, only a checkout.'))
109
170
 
110
171
 
111
172
def _any_local_commits(this_branch, possible_transports):
113
174
    last_rev = revision.ensure_null(this_branch.last_revision())
114
175
    if last_rev != revision.NULL_REVISION:
115
176
        other_branch = this_branch.get_master_branch(possible_transports)
116
 
        this_branch.lock_read()
117
 
        other_branch.lock_read()
118
 
        try:
 
177
        with this_branch.lock_read(), other_branch.lock_read():
119
178
            other_last_rev = other_branch.last_revision()
120
179
            graph = this_branch.repository.get_graph(
121
180
                other_branch.repository)
122
181
            if not graph.is_ancestor(last_rev, other_last_rev):
123
182
                return True
124
 
        finally:
125
 
            other_branch.unlock()
126
 
            this_branch.unlock()
127
183
    return False
128
 
 
129
 
 
130
 
def _update(tree, source_repository, quiet=False, revision_id=None):
131
 
    """Update a working tree to the latest revision of its branch.
132
 
 
133
 
    :param tree: the working tree
134
 
    :param source_repository: repository holding the revisions
135
 
    """
136
 
    tree.lock_tree_write()
137
 
    try:
138
 
        to_branch = tree.branch
139
 
        if revision_id is None:
140
 
            revision_id = to_branch.last_revision()
141
 
        if tree.last_revision() == revision_id:
142
 
            if not quiet:
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())
150
 
    finally:
151
 
        tree.unlock()