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  • Committer: John Arbash Meinel
  • Date: 2010-01-12 22:51:31 UTC
  • mto: This revision was merged to the branch mainline in revision 4955.
  • Revision ID: john@arbash-meinel.com-20100112225131-he8h411p6aeeb947
Delay grabbing an output stream until we actually go to show a diff.

This makes the test suite happy, but it also seems to be reasonable.
If we aren't going to write anything, we don't need to hold an
output stream open.

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bzrlib/uncommit.py
 
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# Copyright (C) 2006 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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# the Free Software Foundation; either version 2 of the License, or
 
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# (at your option) any later version.
 
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#
 
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# This program is distributed in the hope that it will be useful,
 
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
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# GNU General Public License for more details.
 
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#
 
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# You should have received a copy of the GNU General Public License
 
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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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"""Remove the last revision from the history of the current branch."""
 
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# TODO: make the guts of this methods on tree, branch.
 
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import os
 
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from bzrlib import (
 
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    errors,
 
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    revision as _mod_revision,
 
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    )
 
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from bzrlib.branch import Branch
 
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from bzrlib.errors import BoundBranchOutOfDate
 
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def uncommit(branch, dry_run=False, verbose=False, revno=None, tree=None,
 
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             local=False):
 
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    """Remove the last revision from the supplied branch.
 
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    :param dry_run: Don't actually change anything
 
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    :param verbose: Print each step as you do it
 
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    :param revno: Remove back to this revision
 
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    :param local: If this branch is bound, only remove the revisions from the
 
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        local branch. If this branch is not bound, it is an error to pass
 
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        local=True.
 
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    """
 
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    unlockable = []
 
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    try:
 
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        if tree is not None:
 
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            tree.lock_write()
 
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            unlockable.append(tree)
 
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        branch.lock_write()
 
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        unlockable.append(branch)
 
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        pending_merges = []
 
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        if tree is not None:
 
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            pending_merges = tree.get_parent_ids()[1:]
 
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        if local:
 
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            master = None
 
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            if branch.get_bound_location() is None:
 
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                raise errors.LocalRequiresBoundBranch()
 
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        else:
 
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            master = branch.get_master_branch()
 
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            if master is not None:
 
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                master.lock_write()
 
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                unlockable.append(master)
 
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        old_revno, old_tip = branch.last_revision_info()
 
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        if master is not None and old_tip != master.last_revision():
 
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            raise BoundBranchOutOfDate(branch, master)
 
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        if revno is None:
 
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            revno = old_revno
 
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        new_revno = revno - 1
 
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        revid_iterator = branch.repository.iter_reverse_revision_history(
 
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                            old_tip)
 
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        cur_revno = old_revno
 
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        new_revision_id = old_tip
 
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        graph = branch.repository.get_graph()
 
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        for rev_id in revid_iterator:
 
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            if cur_revno == new_revno:
 
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                new_revision_id = rev_id
 
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                break
 
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            if verbose:
 
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                print 'Removing revno %d: %s' % (cur_revno, rev_id)
 
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            cur_revno -= 1
 
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            parents = graph.get_parent_map([rev_id]).get(rev_id, None)
 
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            if not parents:
 
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                continue
 
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            # When we finish popping off the pending merges, we want
 
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            # them to stay in the order that they used to be.
 
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            # but we pop from the end, so reverse the order, and
 
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            # then get the order right at the end
 
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            pending_merges.extend(reversed(parents[1:]))
 
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        else:
 
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            # We ran off the end of revisions, which means we should be trying
 
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            # to get to NULL_REVISION
 
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            new_revision_id = _mod_revision.NULL_REVISION
 
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        if not dry_run:
 
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            if master is not None:
 
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                master.set_last_revision_info(new_revno, new_revision_id)
 
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            branch.set_last_revision_info(new_revno, new_revision_id)
 
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            if master is None:
 
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                hook_local = None
 
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                hook_master = branch
 
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            else:
 
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                hook_local = branch
 
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                hook_master = master
 
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            for hook in Branch.hooks['post_uncommit']:
 
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                hook_new_tip = new_revision_id
 
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                if hook_new_tip == _mod_revision.NULL_REVISION:
 
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                    hook_new_tip = None
 
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                hook(hook_local, hook_master, old_revno, old_tip, new_revno,
 
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                     hook_new_tip)
 
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            if tree is not None:
 
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                if not _mod_revision.is_null(new_revision_id):
 
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                    parents = [new_revision_id]
 
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                else:
 
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                    parents = []
 
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                parents.extend(reversed(pending_merges))
 
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                tree.set_parent_ids(parents)
 
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    finally:
 
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        for item in reversed(unlockable):
 
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            item.unlock()