~bzr-pqm/bzr/bzr.dev

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
# Copyright (C) 2006 Canonical Ltd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

"""Remove the last revision from the history of the current branch.
"""

import os
from bzrlib.errors import BoundBranchOutOfDate

def test_remove(filename):
    if os.path.exists(filename):
        os.remove(filename)
    else:
        print '* file does not exist: %r' % filename


def uncommit(branch, dry_run=False, verbose=False, revno=None, tree=None):
    """Remove the last revision from the supplied branch.

    :param dry_run: Don't actually change anything
    :param verbose: Print each step as you do it
    :param revno: Remove back to this revision
    """
    unlockable = []
    try:
        if tree is not None:
            tree.lock_write()
            unlockable.append(tree)
        
        branch.lock_write()
        unlockable.append(branch)

        pending_merges = []

        master = branch.get_master_branch()
        if master is not None:
            master.lock_write()
            unlockable.append(master)
        rh = branch.revision_history()
        if master is not None and rh[-1] != master.last_revision():
            raise BoundBranchOutOfDate(branch, master)
        if revno is None:
            revno = len(rh)

        files_to_remove = []
        for r in range(revno-1, len(rh)):
            rev_id = rh.pop()
            rev = branch.repository.get_revision(rev_id)
            # When we finish popping off the pending merges, we want
            # them to stay in the order that they used to be.
            # but we pop from the end, so reverse the order, and
            # then get the order right at the end
            pending_merges.extend(reversed(rev.parent_ids[1:]))
            if verbose:
                print 'Removing revno %d: %s' % (len(rh)+1, rev_id)


        # Committing before we start removing files, because
        # once we have removed at least one, all the rest are invalid.
        if not dry_run:
            if master is not None:
                master.set_revision_history(rh)
            branch.set_revision_history(rh)
            if tree is not None:
                tree.set_last_revision(branch.last_revision())
                pending_merges.reverse()
                tree.set_pending_merges(pending_merges)
    finally:
        for item in reversed(unlockable):
            item.unlock()