hgext/obsolete.py
author Pierre-Yves David <pierre-yves.david@fb.com>
Fri, 11 Mar 2016 09:48:12 +0000
changeset 1619 5ef77a1d975c
parent 1550 e47dda53a5c2
child 1647 23521789ded0
permissions -rw-r--r--
hgext: turn 'hgext' into a namespace package Actually since Python 2.3, there is some way to turn top level package into "namespace package" so that multiple subpackage installed in different part of the path can still be imported transparently. This feature was previously thought (at least by myself) to be only provided by some setuptool black magic. Turning hgext into such namespace package allows third extensions to install themselves inside the "hgext" namespace package to avoid polluting the global python module namespace. They will now be able to do so without making it a pain to use a Mercurial "installed" in a different way/location than these extensions.
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# Copyright 2011 Pierre-Yves David <pierre-yves.david@ens-lyon.org>
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#                Logilab SA        <contact@logilab.fr>
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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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"""Deprecated extension that formely introduces "Changeset Obsolescence".
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This concept is now partially in Mercurial core (starting with mercurial 2.3).
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The remaining logic have been grouped with the evolve extension.
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Some code cemains in this extensions to detect and convert prehistoric format
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of obsolete marker than early user may have create. Keep it enabled if you
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were such user.
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"""
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from mercurial import util
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try:
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    from mercurial import obsolete
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except ImportError:
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    raise error.Abort('Obsolete extension requires Mercurial 2.3 (or later)')
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import sys
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import json
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from mercurial import cmdutil
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from mercurial import error
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from mercurial.i18n import _
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from mercurial.node import bin, nullid
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#####################################################################
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### Older format management                                       ###
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#####################################################################
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# Code related to detection and management of older legacy format never
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# handled by core
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def reposetup(ui, repo):
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    """Detect that a repo still contains some old obsolete format
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    """
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    if not repo.local():
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        return
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    evolveopts = ui.configlist('experimental', 'evolution')
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    if not evolveopts:
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        evolveopts = 'all'
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        ui.setconfig('experimental', 'evolution', evolveopts)
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    for arg in sys.argv:
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        if 'debugc' in arg:
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            break
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    else:
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        data = repo.opener.tryread('obsolete-relations')
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        if not data:
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            data = repo.svfs.tryread('obsoletemarkers')
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        if data:
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            raise error.Abort('old format of obsolete marker detected!\n'
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                              'run `hg debugconvertobsolete` once.')
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def _obsdeserialise(flike):
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    """read a file like object serialised with _obsserialise
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    this desierialize into a {subject -> objects} mapping
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    this was the very first format ever."""
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    rels = {}
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    for line in flike:
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        subhex, objhex = line.split()
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        subnode = bin(subhex)
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        if subnode == nullid:
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            subnode = None
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        rels.setdefault(subnode, set()).add(bin(objhex))
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    return rels
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cmdtable = {}
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command = cmdutil.command(cmdtable)
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@command('debugconvertobsolete', [], '')
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def cmddebugconvertobsolete(ui, repo):
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    """import markers from an .hg/obsolete-relations file"""
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    cnt = 0
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    err = 0
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    l = repo.lock()
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    some = False
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    try:
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        unlink = []
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        tr = repo.transaction('convert-obsolete')
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        try:
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            repo._importoldobsolete = True
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            store = repo.obsstore
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            ### very first format
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            try:
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                f = repo.opener('obsolete-relations')
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                try:
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                    some = True
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                    for line in f:
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                        subhex, objhex = line.split()
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                        suc = bin(subhex)
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                        prec = bin(objhex)
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                        sucs = (suc==nullid) and [] or [suc]
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                        meta = {
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                            'date':  '%i %i' % util.makedate(),
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                            'user': ui.username(),
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                            }
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                        try:
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                            store.create(tr, prec, sucs, 0, metadata=meta)
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                            cnt += 1
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                        except ValueError:
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                            repo.ui.write_err("invalid old marker line: %s"
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                                              % (line))
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                            err += 1
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                finally:
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                    f.close()
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                unlink.append(repo.join('obsolete-relations'))
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            except IOError:
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                pass
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            ### second (json) format
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            data = repo.svfs.tryread('obsoletemarkers')
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            if data:
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                some = True
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                for oldmark in json.loads(data):
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                    del oldmark['id']  # dropped for now
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                    del oldmark['reason']  # unused until then
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                    oldobject = str(oldmark.pop('object'))
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                    oldsubjects = [str(s) for s in oldmark.pop('subjects', [])]
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                    LOOKUP_ERRORS = (error.RepoLookupError, error.LookupError)
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                    if len(oldobject) != 40:
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                        try:
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                            oldobject = repo[oldobject].node()
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                        except LOOKUP_ERRORS:
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                            pass
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                    if any(len(s) != 40 for s in oldsubjects):
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                        try:
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                            oldsubjects = [repo[s].node() for s in oldsubjects]
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                        except LOOKUP_ERRORS:
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                            pass
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361
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                    oldmark['date'] = '%i %i' % tuple(oldmark['date'])
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                    meta = dict((k.encode('utf-8'), v.encode('utf-8'))
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                                 for k, v in oldmark.iteritems())
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                    try:
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                        succs = [bin(n) for n in oldsubjects]
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                        succs = [n for n in succs if n != nullid]
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                        store.create(tr, bin(oldobject), succs,
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                                     0, metadata=meta)
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                        cnt += 1
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                    except ValueError:
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                        repo.ui.write_err("invalid marker %s -> %s\n"
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                                     % (oldobject, oldsubjects))
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                        err += 1
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                unlink.append(repo.sjoin('obsoletemarkers'))
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            tr.close()
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            for path in unlink:
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                util.unlink(path)
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        finally:
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            tr.release()
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    finally:
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        del repo._importoldobsolete
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        l.release()
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    if not some:
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        ui.warn(_('nothing to do\n'))
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    ui.status('%i obsolete marker converted\n' % cnt)
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    if err:
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        ui.write_err('%i conversion failed. check you graph!\n' % err)