commands.py 139 KB
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# commands.py - command processing for mercurial
#
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# Copyright 2005-2007 Matt Mackall <mpm@selenic.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from node import hex, nullid, nullrev, short
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from lock import release
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from i18n import _, gettext
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import os, re, sys, difflib, time, tempfile
import hg, util, revlog, bundlerepo, extensions, copies, error
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import patch, help, mdiff, url, encoding, templatekw
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import archival, changegroup, cmdutil, sshserver, hbisect
from hgweb import server
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import merge as merge_
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import minirst
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# Commands start here, listed alphabetically
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def add(ui, repo, *pats, **opts):
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    """add the specified files on the next commit

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    Schedule files to be version controlled and added to the
    repository.
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    The files will be added to the repository at the next commit. To
    undo an add before that, see hg forget.
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    If no names are given, add all files to the repository.
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    .. container:: verbose

       An example showing how new (unknown) files are added
       automatically by ``hg add``::

         $ ls
         foo.c
         $ hg status
         ? foo.c
         $ hg add
         adding foo.c
         $ hg status
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         A foo.c
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    """

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    bad = []
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    names = []
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    m = cmdutil.match(repo, pats, opts)
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    oldbad = m.bad
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    m.bad = lambda x, y: bad.append(x) or oldbad(x, y)
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    for f in repo.walk(m):
        exact = m.exact(f)
        if exact or f not in repo.dirstate:
            names.append(f)
            if ui.verbose or not exact:
                ui.status(_('adding %s\n') % m.rel(f))
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    if not opts.get('dry_run'):
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        bad += [f for f in repo.add(names) if f in m.files()]
    return bad and 1 or 0
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def addremove(ui, repo, *pats, **opts):
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    """add all new files, delete all missing files
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    Add all new files and remove all missing files from the
    repository.
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    New files are ignored if they match any of the patterns in
    .hgignore. As with add, these changes take effect at the next
    commit.
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    Use the -s/--similarity option to detect renamed files. With a
    parameter greater than 0, this compares every removed file with
    every added file and records those similar enough as renames. This
    option takes a percentage between 0 (disabled) and 100 (files must
    be identical) as its parameter. Detecting renamed files this way
    can be expensive.
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    """
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    try:
        sim = float(opts.get('similarity') or 0)
    except ValueError:
        raise util.Abort(_('similarity must be a number'))
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    if sim < 0 or sim > 100:
        raise util.Abort(_('similarity must be between 0 and 100'))
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    return cmdutil.addremove(repo, pats, opts, similarity=sim / 100.0)
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def annotate(ui, repo, *pats, **opts):
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    """show changeset information by line for each file
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    List changes in files, showing the revision id responsible for
    each line
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    This command is useful for discovering when a change was made and
    by whom.
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    Without the -a/--text option, annotate will avoid processing files
    it detects as binary. With -a, annotate will annotate the file
    anyway, although the results will probably be neither useful
    nor desirable.
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    """
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    datefunc = ui.quiet and util.shortdate or util.datestr
    getdate = util.cachefunc(lambda x: datefunc(x[0].date()))
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    if not pats:
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        raise util.Abort(_('at least one filename or pattern is required'))
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    opmap = [('user', lambda x: ui.shortuser(x[0].user())),
             ('number', lambda x: str(x[0].rev())),
             ('changeset', lambda x: short(x[0].node())),
             ('date', getdate),
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             ('file', lambda x: x[0].path()),
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            ]

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    if (not opts.get('user') and not opts.get('changeset')
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        and not opts.get('date') and not opts.get('file')):
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        opts['number'] = 1
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    linenumber = opts.get('line_number') is not None
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    if linenumber and (not opts.get('changeset')) and (not opts.get('number')):
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        raise util.Abort(_('at least one of -n/-c is required for -l'))

    funcmap = [func for op, func in opmap if opts.get(op)]
    if linenumber:
        lastfunc = funcmap[-1]
        funcmap[-1] = lambda x: "%s:%s" % (lastfunc(x), x[1])

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    ctx = repo[opts.get('rev')]
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    m = cmdutil.match(repo, pats, opts)
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    follow = not opts.get('no_follow')
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    for abs in ctx.walk(m):
        fctx = ctx[abs]
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        if not opts.get('text') and util.binary(fctx.data()):
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            ui.write(_("%s: binary file\n") % ((pats and m.rel(abs)) or abs))
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            continue

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        lines = fctx.annotate(follow=follow, linenumber=linenumber)
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        pieces = []

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        for f in funcmap:
            l = [f(n) for n, dummy in lines]
            if l:
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                ml = max(map(len, l))
                pieces.append(["%*s" % (ml, x) for x in l])
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        if pieces:
            for p, l in zip(zip(*pieces), lines):
                ui.write("%s: %s" % (" ".join(p), l[1]))
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def archive(ui, repo, dest, **opts):
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    '''create an unversioned archive of a repository revision
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    By default, the revision used is the parent of the working
    directory; use -r/--rev to specify a different revision.
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    To specify the type of archive to create, use -t/--type. Valid
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    types are:
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    :``files``: a directory full of files (default)
    :``tar``:   tar archive, uncompressed
    :``tbz2``:  tar archive, compressed using bzip2
    :``tgz``:   tar archive, compressed using gzip
    :``uzip``:  zip archive, uncompressed
    :``zip``:   zip archive, compressed using deflate
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    The exact name of the destination archive or directory is given
    using a format string; see 'hg help export' for details.
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    Each member added to an archive file has a directory prefix
    prepended. Use -p/--prefix to specify a format string for the
    prefix. The default is the basename of the archive, with suffixes
    removed.
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    '''

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    ctx = repo[opts.get('rev')]
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    if not ctx:
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        raise util.Abort(_('no working directory: please specify a revision'))
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    node = ctx.node()
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    dest = cmdutil.make_filename(repo, dest, node)
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    if os.path.realpath(dest) == repo.root:
        raise util.Abort(_('repository root cannot be destination'))
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    matchfn = cmdutil.match(repo, [], opts)
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    kind = opts.get('type') or 'files'
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    prefix = opts.get('prefix')
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    if dest == '-':
        if kind == 'files':
            raise util.Abort(_('cannot archive plain files to stdout'))
        dest = sys.stdout
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        if not prefix:
            prefix = os.path.basename(repo.root) + '-%h'
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    prefix = cmdutil.make_filename(repo, prefix, node)
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    archival.archive(repo, dest, node, kind, not opts.get('no_decode'),
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                     matchfn, prefix)
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def backout(ui, repo, node=None, rev=None, **opts):
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    '''reverse effect of earlier changeset

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    Commit the backed out changes as a new changeset. The new
    changeset is a child of the backed out changeset.
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    If you backout a changeset other than the tip, a new head is
    created. This head will be the new tip and you should merge this
    backout changeset with another head.
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    The --merge option remembers the parent of the working directory
    before starting the backout, then merges the new head with that
    changeset afterwards. This saves you from doing the merge by hand.
    The result of this merge is not committed, as with a normal merge.
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    See 'hg help dates' for a list of formats valid for -d/--date.
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    '''
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    if rev and node:
        raise util.Abort(_("please specify just one revision"))

    if not rev:
        rev = node
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    if not rev:
        raise util.Abort(_("please specify a revision to backout"))

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    date = opts.get('date')
    if date:
        opts['date'] = util.parsedate(date)

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    cmdutil.bail_if_changed(repo)
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    node = repo.lookup(rev)
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    op1, op2 = repo.dirstate.parents()
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    a = repo.changelog.ancestor(op1, node)
    if a != node:
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        raise util.Abort(_('cannot backout change on a different branch'))
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    p1, p2 = repo.changelog.parents(node)
    if p1 == nullid:
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        raise util.Abort(_('cannot backout a change with no parents'))
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    if p2 != nullid:
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        if not opts.get('parent'):
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            raise util.Abort(_('cannot backout a merge changeset without '
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                               '--parent'))
        p = repo.lookup(opts['parent'])
        if p not in (p1, p2):
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            raise util.Abort(_('%s is not a parent of %s') %
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                             (short(p), short(node)))
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        parent = p
    else:
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        if opts.get('parent'):
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            raise util.Abort(_('cannot use --parent on non-merge changeset'))
        parent = p1
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    # the backout should appear on the same branch
    branch = repo.dirstate.branch()
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    hg.clean(repo, node, show_stats=False)
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    repo.dirstate.setbranch(branch)
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    revert_opts = opts.copy()
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    revert_opts['date'] = None
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    revert_opts['all'] = True
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    revert_opts['rev'] = hex(parent)
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    revert_opts['no_backup'] = None
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    revert(ui, repo, **revert_opts)
    commit_opts = opts.copy()
    commit_opts['addremove'] = False
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    if not commit_opts['message'] and not commit_opts['logfile']:
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        # we don't translate commit messages
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        commit_opts['message'] = "Backed out changeset %s" % short(node)
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        commit_opts['force_editor'] = True
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    commit(ui, repo, **commit_opts)
    def nice(node):
        return '%d:%s' % (repo.changelog.rev(node), short(node))
    ui.status(_('changeset %s backs out changeset %s\n') %
              (nice(repo.changelog.tip()), nice(node)))
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    if op1 != node:
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        hg.clean(repo, op1, show_stats=False)
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        if opts.get('merge'):
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            ui.status(_('merging with changeset %s\n')
                      % nice(repo.changelog.tip()))
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            hg.merge(repo, hex(repo.changelog.tip()))
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        else:
            ui.status(_('the backout changeset is a new head - '
                        'do not forget to merge\n'))
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            ui.status(_('(use "backout --merge" '
                        'if you want to auto-merge)\n'))
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def bisect(ui, repo, rev=None, extra=None, command=None,
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               reset=None, good=None, bad=None, skip=None, noupdate=None):
    """subdivision search of changesets

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    This command helps to find changesets which introduce problems. To
    use, mark the earliest changeset you know exhibits the problem as
    bad, then mark the latest changeset which is free from the problem
    as good. Bisect will update your working directory to a revision
    for testing (unless the -U/--noupdate option is specified). Once
    you have performed tests, mark the working directory as good or
    bad, and bisect will either update to another candidate changeset
    or announce that it has found the bad revision.

    As a shortcut, you can also use the revision argument to mark a
    revision as good or bad without checking it out first.

    If you supply a command, it will be used for automatic bisection.
    Its exit status will be used to mark revisions as good or bad:
    status 0 means good, 125 means to skip the revision, 127
    (command not found) will abort the bisection, and any other
    non-zero exit status means the revision is bad.
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    """
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    def print_result(nodes, good):
        displayer = cmdutil.show_changeset(ui, repo, {})
        if len(nodes) == 1:
            # narrowed it down to a single revision
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            if good:
                ui.write(_("The first good revision is:\n"))
            else:
                ui.write(_("The first bad revision is:\n"))
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            displayer.show(repo[nodes[0]])
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        else:
            # multiple possible revisions
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            if good:
                ui.write(_("Due to skipped revisions, the first "
                        "good revision could be any of:\n"))
            else:
                ui.write(_("Due to skipped revisions, the first "
                        "bad revision could be any of:\n"))
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            for n in nodes:
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                displayer.show(repo[n])
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        displayer.close()
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    def check_state(state, interactive=True):
        if not state['good'] or not state['bad']:
            if (good or bad or skip or reset) and interactive:
                return
            if not state['good']:
                raise util.Abort(_('cannot bisect (no known good revisions)'))
            else:
                raise util.Abort(_('cannot bisect (no known bad revisions)'))
        return True

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    # backward compatibility
    if rev in "good bad reset init".split():
        ui.warn(_("(use of 'hg bisect <cmd>' is deprecated)\n"))
        cmd, rev, extra = rev, extra, None
        if cmd == "good":
            good = True
        elif cmd == "bad":
            bad = True
        else:
            reset = True
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    elif extra or good + bad + skip + reset + bool(command) > 1:
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        raise util.Abort(_('incompatible arguments'))
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    if reset:
        p = repo.join("bisect.state")
        if os.path.exists(p):
            os.unlink(p)
        return

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    state = hbisect.load_state(repo)

    if command:
        changesets = 1
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        try:
            while changesets:
                # update state
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                status = util.system(command)
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                if status == 125:
                    transition = "skip"
                elif status == 0:
                    transition = "good"
                # status < 0 means process was killed
                elif status == 127:
                    raise util.Abort(_("failed to execute %s") % command)
                elif status < 0:
                    raise util.Abort(_("%s killed") % command)
                else:
                    transition = "bad"
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                ctx = repo[rev or '.']
                state[transition].append(ctx.node())
                ui.status(_('Changeset %d:%s: %s\n') % (ctx, ctx, transition))
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                check_state(state, interactive=False)
                # bisect
                nodes, changesets, good = hbisect.bisect(repo.changelog, state)
                # update to next check
                cmdutil.bail_if_changed(repo)
                hg.clean(repo, nodes[0], show_stats=False)
        finally:
            hbisect.save_state(repo, state)
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        return print_result(nodes, good)
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    # update state
    node = repo.lookup(rev or '.')
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    if good or bad or skip:
        if good:
            state['good'].append(node)
        elif bad:
            state['bad'].append(node)
        elif skip:
            state['skip'].append(node)
        hbisect.save_state(repo, state)
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    if not check_state(state):
        return
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    # actually bisect
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    nodes, changesets, good = hbisect.bisect(repo.changelog, state)
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    if changesets == 0:
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        print_result(nodes, good)
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    else:
        assert len(nodes) == 1 # only a single node can be tested next
        node = nodes[0]
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        # compute the approximate number of remaining tests
        tests, size = 0, 2
        while size <= changesets:
            tests, size = tests + 1, size * 2
        rev = repo.changelog.rev(node)
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        ui.write(_("Testing changeset %d:%s "
                   "(%d changesets remaining, ~%d tests)\n")
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                 % (rev, short(node), changesets, tests))
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        if not noupdate:
            cmdutil.bail_if_changed(repo)
            return hg.clean(repo, node)

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def branch(ui, repo, label=None, **opts):
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    """set or show the current branch name

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    With no argument, show the current branch name. With one argument,
    set the working directory branch name (the branch will not exist
    in the repository until the next commit). Standard practice
    recommends that primary development take place on the 'default'
    branch.
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    Unless -f/--force is specified, branch will not let you set a
    branch name that already exists, even if it's inactive.
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    Use -C/--clean to reset the working directory branch to that of
    the parent of the working directory, negating a previous branch
    change.
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    Use the command 'hg update' to switch to an existing branch. Use
    'hg commit --close-branch' to mark this branch as closed.
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    """

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    if opts.get('clean'):
        label = repo[None].parents()[0].branch()
        repo.dirstate.setbranch(label)
        ui.status(_('reset working directory to branch %s\n') % label)
    elif label:
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        utflabel = encoding.fromlocal(label)
        if not opts.get('force') and utflabel in repo.branchtags():
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            if label not in [p.branch() for p in repo.parents()]:
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                raise util.Abort(_('a branch of the same name already exists'
                                   ' (use --force to override)'))
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        repo.dirstate.setbranch(utflabel)
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        ui.status(_('marked working directory as branch %s\n') % label)
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    else:
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        ui.write("%s\n" % encoding.tolocal(repo.dirstate.branch()))
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def branches(ui, repo, active=False, closed=False):
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    """list repository named branches

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    List the repository's named branches, indicating which ones are
    inactive. If -c/--closed is specified, also list branches which have
    been marked closed (see hg commit --close-branch).
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    If -a/--active is specified, only show active branches. A branch
    is considered active if it contains repository heads.
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    Use the command 'hg update' to switch to an existing branch.
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    """
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    hexfunc = ui.debugflag and hex or short
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    activebranches = [repo[n].branch() for n in repo.heads()]
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    def testactive(tag, node):
        realhead = tag in activebranches
        open = node in repo.branchheads(tag, closed=False)
        return realhead and open
    branches = sorted([(testactive(tag, node), repo.changelog.rev(node), tag)
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                          for tag, node in repo.branchtags().items()],
                      reverse=True)
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    for isactive, node, tag in branches:
        if (not active) or isactive:
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            encodedtag = encoding.tolocal(tag)
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            if ui.quiet:
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                ui.write("%s\n" % encodedtag)
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            else:
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                hn = repo.lookup(node)
                if isactive:
                    notice = ''
                elif hn not in repo.branchheads(tag, closed=False):
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                    if not closed:
                        continue
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                    notice = _(' (closed)')
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                else:
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                    notice = _(' (inactive)')
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                rev = str(node).rjust(31 - encoding.colwidth(encodedtag))
                data = encodedtag, rev, hexfunc(hn), notice
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                ui.write("%s %s:%s%s\n" % data)
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def bundle(ui, repo, fname, dest=None, **opts):
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    """create a changegroup file

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    Generate a compressed changegroup file collecting changesets not
    known to be in another repository.
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    If you omit the destination repository, then hg assumes the
    destination will have all the nodes you specify with --base
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    parameters. To create a bundle containing all changesets, use
    -a/--all (or --base null).
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    You can change compression method with the -t/--type option.
    The available compression methods are: none, bzip2, and
    gzip (by default, bundles are compressed using bzip2).
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    The bundle file can then be transferred using conventional means
    and applied to another repository with the unbundle or pull
    command. This is useful when direct push and pull are not
    available or when exporting an entire repository is undesirable.
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    Applying bundles preserves all changeset contents including
    permissions, copy/rename information, and revision history.
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    """
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    revs = opts.get('rev') or None
    if revs:
        revs = [repo.lookup(rev) for rev in revs]
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    if opts.get('all'):
        base = ['null']
    else:
        base = opts.get('base')
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    if base:
        if dest:
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            raise util.Abort(_("--base is incompatible with specifying "
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                               "a destination"))
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        base = [repo.lookup(rev) for rev in base]
        # create the right base
        # XXX: nodesbetween / changegroup* should be "fixed" instead
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        o = []
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        has = set((nullid,))
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        for n in base:
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            has.update(repo.changelog.reachable(n))
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        if revs:
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            visit = list(revs)
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            has.difference_update(revs)
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        else:
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            visit = repo.changelog.heads()
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        seen = {}
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        while visit:
            n = visit.pop(0)
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            parents = [p for p in repo.changelog.parents(n) if p not in has]
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            if len(parents) == 0:
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                if n not in has:
                    o.append(n)
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            else:
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                for p in parents:
                    if p not in seen:
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                        seen[p] = 1
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                        visit.append(p)
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    else:
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        dest = ui.expandpath(dest or 'default-push', dest or 'default')
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        dest, branches = hg.parseurl(dest, opts.get('branch'))
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        other = hg.repository(cmdutil.remoteui(repo, opts), dest)
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        revs, checkout = hg.addbranchrevs(repo, other, branches, revs)
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        o = repo.findoutgoing(other, force=opts.get('force'))
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    if revs:
        cg = repo.changegroupsubset(o, revs, 'bundle')
    else:
        cg = repo.changegroup(o, 'bundle')
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    bundletype = opts.get('type', 'bzip2').lower()
    btypes = {'none': 'HG10UN', 'bzip2': 'HG10BZ', 'gzip': 'HG10GZ'}
    bundletype = btypes.get(bundletype)
    if bundletype not in changegroup.bundletypes:
        raise util.Abort(_('unknown bundle type specified with --type'))

    changegroup.writebundle(cg, fname, bundletype)
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def cat(ui, repo, file1, *pats, **opts):
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    """output the current or given revision of files
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    Print the specified files as they were at the given revision. If
    no revision is given, the parent of the working directory is used,
    or tip if no revision is checked out.
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    Output may be to a file, in which case the name of the file is
    given using a format string. The formatting rules are the same as
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    for the export command, with the following additions:
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    :``%s``: basename of file being printed
    :``%d``: dirname of file being printed, or '.' if in repository root
    :``%p``: root-relative path name of file being printed
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    """
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    ctx = repo[opts.get('rev')]
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    err = 1
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    m = cmdutil.match(repo, (file1,) + pats, opts)
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    for abs in ctx.walk(m):
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        fp = cmdutil.make_file(repo, opts.get('output'), ctx.node(), pathname=abs)
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        data = ctx[abs].data()
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        if opts.get('decode'):
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            data = repo.wwritedata(abs, data)
        fp.write(data)
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        err = 0
    return err
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def clone(ui, source, dest=None, **opts):
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    """make a copy of an existing repository

    Create a copy of an existing repository in a new directory.

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    If no destination directory name is specified, it defaults to the
    basename of the source.
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    The location of the source is added to the new repository's
    .hg/hgrc file, as the default to be used for future pulls.
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    See 'hg help urls' for valid source format details.

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    It is possible to specify an ``ssh://`` URL as the destination, but no
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    .hg/hgrc and working directory will be created on the remote side.
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    Please see 'hg help urls' for important details about ``ssh://`` URLs.
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    If the -U/--noupdate option is specified, the new clone will contain
    only a repository (.hg) and no working copy (the working copy parent
    will be the null changeset). Otherwise, clone will initially check
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    out (in order of precedence):
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    a) the changeset, tag or branch specified with -u/--updaterev
    b) the changeset, tag or branch given with the first -r/--rev
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    c) the branch given with the first -b/--branch
    d) the branch given with the url#branch source syntax
    e) the head of the default branch
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    Use 'hg clone -u . src dst' to checkout the source repository's
    parent changeset (applicable for local source repositories only).

    A set of changesets (tags, or branch names) to pull may be specified
    by listing each changeset (tag, or branch name) with -r/--rev.
    If -r/--rev is used, the cloned repository will contain only a subset
    of the changesets of the source repository. Only the set of changesets
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    defined by all -r/--rev options (including all their ancestors)
    will be pulled into the destination repository.
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    No subsequent changesets (including subsequent tags) will be present
    in the destination.

    Using -r/--rev (or 'clone src#rev dest') implies --pull, even for
    local source repositories.

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    For efficiency, hardlinks are used for cloning whenever the source
    and destination are on the same filesystem (note this applies only
    to the repository data, not to the checked out files). Some
    filesystems, such as AFS, implement hardlinking incorrectly, but
    do not report errors. In these cases, use the --pull option to
    avoid hardlinking.
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    In some cases, you can clone repositories and checked out files
    using full hardlinks with ::
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      $ cp -al REPO REPOCLONE

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    This is the fastest way to clone, but it is not always safe. The
    operation is not atomic (making sure REPO is not modified during
    the operation is up to you) and you have to make sure your editor
    breaks hardlinks (Emacs and most Linux Kernel tools do so). Also,
    this is not compatible with certain extensions that place their
    metadata under the .hg directory, such as mq.
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    """
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    if opts.get('noupdate') and opts.get('updaterev'):
        raise util.Abort(_("cannot specify both --noupdate and --updaterev"))

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    hg.clone(cmdutil.remoteui(ui, opts), source, dest,
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             pull=opts.get('pull'),
             stream=opts.get('uncompressed'),
             rev=opts.get('rev'),
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             update=opts.get('updaterev') or not opts.get('noupdate'),
             branch=opts.get('branch'))
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def commit(ui, repo, *pats, **opts):
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    """commit the specified files or all outstanding changes

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    Commit changes to the given files into the repository. Unlike a
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    centralized RCS, this operation is a local operation. See hg push
    for a way to actively distribute your changes.
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    If a list of files is omitted, all changes reported by "hg status"
    will be committed.
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    If you are committing the result of a merge, do not provide any
    filenames or -I/-X filters.
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    If no commit message is specified, the configured editor is
    started to prompt you for a message.
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    See 'hg help dates' for a list of formats valid for -d/--date.
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    """
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    extra = {}
    if opts.get('close_branch'):
        extra['close'] = 1
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    e = cmdutil.commiteditor
    if opts.get('force_editor'):
        e = cmdutil.commitforceeditor

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    def commitfunc(ui, repo, message, match, opts):
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        return repo.commit(message, opts.get('user'), opts.get('date'), match,
                           editor=e, extra=extra)
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    node = cmdutil.commit(ui, repo, commitfunc, pats, opts)
    if not node:
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        ui.status(_("nothing changed\n"))
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        return
    cl = repo.changelog
    rev = cl.rev(node)
    parents = cl.parentrevs(rev)
    if rev - 1 in parents:
        # one of the parents was the old tip
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        pass
    elif (parents == (nullrev, nullrev) or
          len(cl.heads(cl.node(parents[0]))) > 1 and
          (parents[1] == nullrev or len(cl.heads(cl.node(parents[1]))) > 1)):
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        ui.status(_('created new head\n'))
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    if ui.debugflag:
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        ui.write(_('committed changeset %d:%s\n') % (rev, hex(node)))
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    elif ui.verbose:
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        ui.write(_('committed changeset %d:%s\n') % (rev, short(node)))
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def copy(ui, repo, *pats, **opts):
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    """mark files as copied for the next commit

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    Mark dest as having copies of source files. If dest is a
    directory, copies are put in that directory. If dest is a file,
    the source must be a single file.
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    By default, this command copies the contents of files as they
    exist in the working directory. If invoked with -A/--after, the
    operation is recorded, but no copying is performed.
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    This command takes effect with the next commit. To undo a copy
    before that, see hg revert.
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    """
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    wlock = repo.wlock(False)
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    try:
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        return cmdutil.copy(ui, repo, pats, opts)
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    finally:
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        wlock.release()
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def debugancestor(ui, repo, *args):
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    """find the ancestor revision of two revisions in a given index"""
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    if len(args) == 3:
        index, rev1, rev2 = args
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        r = revlog.revlog(util.opener(os.getcwd(), audit=False), index)
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        lookup = r.lookup
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    elif len(args) == 2:
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        if not repo:
            raise util.Abort(_("There is no Mercurial repository here "
                               "(.hg not found)"))
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        rev1, rev2 = args
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        r = repo.changelog
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        lookup = repo.lookup