mercurial/repair.py
author Pradeepkumar Gayam <in3xes@gmail.com>
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tests: unify test-merge-closedheads
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# repair.py - functions for repository repair for mercurial
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#
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# Copyright 2005, 2006 Chris Mason <mason@suse.com>
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# Copyright 2007 Matt Mackall
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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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import changegroup
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from node import nullrev, short
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from i18n import _
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import os
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def _bundle(repo, bases, heads, node, suffix, extranodes=None, compress=True):
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    """create a bundle with the specified revisions as a backup"""
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    cg = repo.changegroupsubset(bases, heads, 'strip', extranodes)
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    backupdir = repo.join("strip-backup")
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    if not os.path.isdir(backupdir):
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        os.mkdir(backupdir)
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    name = os.path.join(backupdir, "%s-%s.hg" % (short(node), suffix))
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    if compress:
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        bundletype = "HG10BZ"
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    else:
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        bundletype = "HG10UN"
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    return changegroup.writebundle(cg, name, bundletype)
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def _collectfiles(repo, striprev):
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    """find out the filelogs affected by the strip"""
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    files = set()
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    for x in xrange(striprev, len(repo)):
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        files.update(repo[x].files())
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    return sorted(files)
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def _collectextranodes(repo, files, link):
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    """return the nodes that have to be saved before the strip"""
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    def collectone(revlog):
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        extra = []
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        startrev = count = len(revlog)
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        # find the truncation point of the revlog
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        for i in xrange(count):
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            lrev = revlog.linkrev(i)
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            if lrev >= link:
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                startrev = i + 1
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                break
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        # see if any revision after that point has a linkrev less than link
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        # (we have to manually save these guys)
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        for i in xrange(startrev, count):
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            node = revlog.node(i)
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            lrev = revlog.linkrev(i)
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            if lrev < link:
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                extra.append((node, cl.node(lrev)))
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        return extra
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    extranodes = {}
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    cl = repo.changelog
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    extra = collectone(repo.manifest)
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    if extra:
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        extranodes[1] = extra
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    for fname in files:
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        f = repo.file(fname)
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        extra = collectone(f)
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        if extra:
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            extranodes[fname] = extra
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    return extranodes
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def strip(ui, repo, node, backup="all"):
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    cl = repo.changelog
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    # TODO delete the undo files, and handle undo of merge sets
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    striprev = cl.rev(node)
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    keeppartialbundle = backup == 'strip'
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    # Some revisions with rev > striprev may not be descendants of striprev.
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    # We have to find these revisions and put them in a bundle, so that
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    # we can restore them after the truncations.
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    # To create the bundle we use repo.changegroupsubset which requires
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    # the list of heads and bases of the set of interesting revisions.
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    # (head = revision in the set that has no descendant in the set;
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    #  base = revision in the set that has no ancestor in the set)
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    tostrip = set((striprev,))
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    saveheads = set()
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    savebases = []
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    for r in xrange(striprev + 1, len(cl)):
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        parents = cl.parentrevs(r)
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        if parents[0] in tostrip or parents[1] in tostrip:
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            # r is a descendant of striprev
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            tostrip.add(r)
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            # if this is a merge and one of the parents does not descend
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            # from striprev, mark that parent as a savehead.
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            if parents[1] != nullrev:
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                for p in parents:
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                    if p not in tostrip and p > striprev:
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                        saveheads.add(p)
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        else:
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            # if no parents of this revision will be stripped, mark it as
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            # a savebase
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            if parents[0] < striprev and parents[1] < striprev:
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                savebases.append(cl.node(r))
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            saveheads.difference_update(parents)
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            saveheads.add(r)
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    saveheads = [cl.node(r) for r in saveheads]
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    files = _collectfiles(repo, striprev)
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    extranodes = _collectextranodes(repo, files, striprev)
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    # create a changegroup for all the branches we need to keep
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    backupfile = None
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    if backup == "all":
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        backupfile = _bundle(repo, [node], cl.heads(), node, 'backup')
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        repo.ui.status(_("saved backup bundle to %s\n") % backupfile)
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    if saveheads or extranodes:
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        # do not compress partial bundle if we remove it from disk later
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        chgrpfile = _bundle(repo, savebases, saveheads, node, 'temp',
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                            extranodes=extranodes, compress=keeppartialbundle)
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    mfst = repo.manifest
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    tr = repo.transaction("strip")
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    offset = len(tr.entries)
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   127
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    try:
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        tr.startgroup()
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        cl.strip(striprev, tr)
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        mfst.strip(striprev, tr)
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        for fn in files:
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            repo.file(fn).strip(striprev, tr)
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        tr.endgroup()
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        try:
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            for i in xrange(offset, len(tr.entries)):
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                file, troffset, ignore = tr.entries[i]
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                repo.sopener(file, 'a').truncate(troffset)
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            tr.close()
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        except:
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            tr.abort()
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            raise
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   144
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        if saveheads or extranodes:
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            ui.note(_("adding branch\n"))
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            f = open(chgrpfile, "rb")
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            gen = changegroup.readbundle(f, chgrpfile)
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            if not repo.ui.verbose:
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                # silence internal shuffling chatter
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                repo.ui.pushbuffer()
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            repo.addchangegroup(gen, 'strip', 'bundle:' + chgrpfile, True)
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            if not repo.ui.verbose:
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                repo.ui.popbuffer()
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            f.close()
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            if not keeppartialbundle:
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                os.unlink(chgrpfile)
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    except:
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        if backupfile:
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            ui.warn(_("strip failed, full bundle stored in '%s'\n")
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                    % backupfile)
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        elif saveheads:
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            ui.warn(_("strip failed, partial bundle stored in '%s'\n")
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                    % chgrpfile)
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   165
        raise
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   167
    repo.destroyed()