← Back to branch summary

~bzr-pqm/bzr/bzr.dev

« back to all changes in this revision

Viewing changes to bzrlib/uncommit.py

  • Committer: Vincent Ladeuil
  • Date: 2010-02-05 10:27:33 UTC
  • mto: (5008.1.1 integration)
  • mto: This revision was merged to the branch mainline in revision 5009.
  • Revision ID: v.ladeuil+lp@free.fr-20100205102733-8wpjnqz6g4nvrbfu
All Conflict action method names start with 'action_' to avoid potential namespace collisions

Show diffs side-by-side

added added

removed removed

Lines of Context:
bzrlib/uncommit.py
 
1
# Copyright (C) 2006 Canonical Ltd
 
2
#
 
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.
 
7
#
 
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.
 
12
#
 
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
 
16
 
 
17
"""Remove the last revision from the history of the current branch."""
 
18
 
 
19
# TODO: make the guts of this methods on tree, branch.
 
20
 
 
21
import os
 
22
 
 
23
from bzrlib import (
 
24
    errors,
 
25
    revision as _mod_revision,
 
26
    )
 
27
from bzrlib.branch import Branch
 
28
from bzrlib.errors import BoundBranchOutOfDate
 
29
 
 
30
 
 
31
def uncommit(branch, dry_run=False, verbose=False, revno=None, tree=None,
 
32
             local=False):
 
33
    """Remove the last revision from the supplied branch.
 
34
 
 
35
    :param dry_run: Don't actually change anything
 
36
    :param verbose: Print each step as you do it
 
37
    :param revno: Remove back to this revision
 
38
    :param local: If this branch is bound, only remove the revisions from the
 
39
        local branch. If this branch is not bound, it is an error to pass
 
40
        local=True.
 
41
    """
 
42
    unlockable = []
 
43
    try:
 
44
        if tree is not None:
 
45
            tree.lock_write()
 
46
            unlockable.append(tree)
 
47
 
 
48
        branch.lock_write()
 
49
        unlockable.append(branch)
 
50
 
 
51
        pending_merges = []
 
52
        if tree is not None:
 
53
            pending_merges = tree.get_parent_ids()[1:]
 
54
 
 
55
        if local:
 
56
            master = None
 
57
            if branch.get_bound_location() is None:
 
58
                raise errors.LocalRequiresBoundBranch()
 
59
        else:
 
60
            master = branch.get_master_branch()
 
61
            if master is not None:
 
62
                master.lock_write()
 
63
                unlockable.append(master)
 
64
        old_revno, old_tip = branch.last_revision_info()
 
65
        if master is not None and old_tip != master.last_revision():
 
66
            raise BoundBranchOutOfDate(branch, master)
 
67
        if revno is None:
 
68
            revno = old_revno
 
69
        new_revno = revno - 1
 
70
 
 
71
        revid_iterator = branch.repository.iter_reverse_revision_history(
 
72
                            old_tip)
 
73
        cur_revno = old_revno
 
74
        new_revision_id = old_tip
 
75
        graph = branch.repository.get_graph()
 
76
        for rev_id in revid_iterator:
 
77
            if cur_revno == new_revno:
 
78
                new_revision_id = rev_id
 
79
                break
 
80
            if verbose:
 
81
                print 'Removing revno %d: %s' % (cur_revno, rev_id)
 
82
            cur_revno -= 1
 
83
            parents = graph.get_parent_map([rev_id]).get(rev_id, None)
 
84
            if not parents:
 
85
                continue
 
86
            # When we finish popping off the pending merges, we want
 
87
            # them to stay in the order that they used to be.
 
88
            # but we pop from the end, so reverse the order, and
 
89
            # then get the order right at the end
 
90
            pending_merges.extend(reversed(parents[1:]))
 
91
        else:
 
92
            # We ran off the end of revisions, which means we should be trying
 
93
            # to get to NULL_REVISION
 
94
            new_revision_id = _mod_revision.NULL_REVISION
 
95
 
 
96
        if not dry_run:
 
97
            if master is not None:
 
98
                master.set_last_revision_info(new_revno, new_revision_id)
 
99
            branch.set_last_revision_info(new_revno, new_revision_id)
 
100
            if master is None:
 
101
                hook_local = None
 
102
                hook_master = branch
 
103
            else:
 
104
                hook_local = branch
 
105
                hook_master = master
 
106
            for hook in Branch.hooks['post_uncommit']:
 
107
                hook_new_tip = new_revision_id
 
108
                if hook_new_tip == _mod_revision.NULL_REVISION:
 
109
                    hook_new_tip = None
 
110
                hook(hook_local, hook_master, old_revno, old_tip, new_revno,
 
111
                     hook_new_tip)
 
112
            if tree is not None:
 
113
                if not _mod_revision.is_null(new_revision_id):
 
114
                    parents = [new_revision_id]
 
115
                else:
 
116
                    parents = []
 
117
                parents.extend(reversed(pending_merges))
 
118
                tree.set_parent_ids(parents)
 
119
    finally:
 
120
        for item in reversed(unlockable):
 
121
            item.unlock()