hgext/drophack.py
author Greg Ward <greg@gerg.ca>
Thu, 23 Apr 2015 21:13:13 -0400
branchstable
changeset 1288 c3ecf6871872
parent 1210 1f8428096078
child 1553 ed63bf62ff02
permissions -rw-r--r--
docs: format concepts guide better, with literal blocks
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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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'''This extension add a hacky command to drop changeset during review
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This extension is intended as a temporary hack to allow Matt Mackall to use
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evolve in the Mercurial review it self. You should probably not use it if your
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name is not Matt Mackall.
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'''
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import os
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import time
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import contextlib
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from mercurial.i18n import _
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from mercurial import cmdutil
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from mercurial import repair
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from mercurial import scmutil
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from mercurial import lock as lockmod
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from mercurial import util
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from mercurial import commands
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cmdtable = {}
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command = cmdutil.command(cmdtable)
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@contextlib.contextmanager
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def timed(ui, caption):
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    ostart = os.times()
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    cstart = time.time()
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    yield
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    cstop = time.time()
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    ostop = os.times()
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    wall = cstop - cstart
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    user = ostop[0] - ostart[0]
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    sys  = ostop[1] - ostart[1]
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    comb = user + sys
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    ui.write("%s: wall %f comb %f user %f sys %f\n"
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             % (caption, wall, comb, user, sys))
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def obsmarkerchainfrom(obsstore, nodes):
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    """return all marker chain starting from node
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    Starting from mean "use as successors"."""
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    # XXX need something smarter for descendant of bumped changeset
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    seennodes = set(nodes)
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    seenmarkers = set()
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    pendingnodes = set(nodes)
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    precursorsmarkers = obsstore.precursors
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    while pendingnodes:
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        current = pendingnodes.pop()
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        new = set()
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        for precmark in precursorsmarkers.get(current, ()):
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            if precmark in seenmarkers:
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                continue
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            seenmarkers.add(precmark)
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            new.add(precmark[0])
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            yield precmark
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        new -= seennodes
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        pendingnodes |= new
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def stripmarker(ui, repo, markers):
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    """remove <markers> from the repo obsstore
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    The old obsstore content is saved in a `obsstore.prestrip` file
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    """
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    repo = repo.unfiltered()
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    repo.destroying()
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    oldmarkers = list(repo.obsstore._all)
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    util.rename(repo.sjoin('obsstore'),
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                repo.join('obsstore.prestrip'))
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    del repo.obsstore # drop the cache
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    newstore = repo.obsstore
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    assert not newstore # should be empty after rename
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    newmarkers = [m for m in oldmarkers if m not in markers]
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    tr = repo.transaction('drophack')
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    try:
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        newstore.add(tr, newmarkers)
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        tr.close()
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    finally:
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        tr.release()
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    repo.destroyed()
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@command('drop', [('r', 'rev', [], 'revision to update')], _('[-r] revs'))
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def cmddrop(ui, repo, *revs, **opts):
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    """I'm hacky do not use me!
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    This command strip a changeset, its precursors and all obsolescence marker
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    associated to its chain.
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    There is no way to limit the extend of the purge yet. You may have to
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    repull from other source to get some changeset and obsolescence marker
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    back.
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    This intended for Matt Mackall usage only. do not use me.
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    """
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    revs = list(revs)
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    revs.extend(opts['rev'])
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    if not revs:
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        revs = ['.']
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    # get the changeset
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    revs = scmutil.revrange(repo, revs)
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    if not revs:
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        ui.write_err('no revision to drop\n')
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        return 1
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    # lock from the beginning to prevent race
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    wlock = lock = None
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    try:
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        wlock = repo.wlock()
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        lock = repo.lock()
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        # check they have no children
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        if repo.revs('%ld and public()', revs):
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            ui.write_err('cannot drop public revision')
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            return 1
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        if repo.revs('children(%ld) - %ld', revs, revs):
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            ui.write_err('cannot drop revision with children')
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            return 1
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        if repo.revs('. and %ld', revs):
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            newrevs = repo.revs('max(::. - %ld)', revs)
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            if newrevs:
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                assert len(newrevs) == 1
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                newrev = newrevs.first()
790
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            else:
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                newrev = -1
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            commands.update(ui, repo, newrev)
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            ui.status(_('working directory now at %s\n') % repo[newrev])
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        # get all markers and successors up to root
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        nodes = [repo[r].node() for r in revs]
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        with timed(ui, 'search obsmarker'):
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            markers = set(obsmarkerchainfrom(repo.obsstore, nodes))
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        ui.write('%i obsmarkers found\n' % len(markers))
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        cl = repo.unfiltered().changelog
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        with timed(ui, 'search nodes'):
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            allnodes = set(nodes)
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            allnodes.update(m[0] for m in markers if cl.hasnode(m[0]))
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        ui.write('%i nodes found\n' % len(allnodes))
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        cl = repo.changelog
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        visiblenodes = set(n for n in allnodes if cl.hasnode(n))
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        # check constraint again
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        if repo.revs('%ln and public()', visiblenodes):
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            ui.write_err('cannot drop public revision')
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            return 1
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        if repo.revs('children(%ln) - %ln', visiblenodes, visiblenodes):
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            ui.write_err('cannot drop revision with children')
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            return 1
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        if markers:
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            # strip them
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            with timed(ui, 'strip obsmarker'):
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                stripmarker(ui, repo, markers)
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        # strip the changeset
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        with timed(ui, 'strip nodes'):
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            repair.strip(ui, repo, list(allnodes), backup="all", topic='drophack')
790
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    finally:
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        lockmod.release(lock, wlock)
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   157
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   158
    # rewrite the whole file.
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   159
    # print data.
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   160
    # - time to compute the chain
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   161
    # - time to strip the changeset
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   162
    # - time to strip the obs marker.