diff -r 5c86af0da91d -r ec04eb4d2c6e hgext/obsolete.py
--- a/hgext/obsolete.py	Tue Feb 28 17:08:14 2017 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,163 +0,0 @@
-# Copyright 2011 Pierre-Yves David <pierre-yves.david@ens-lyon.org>
-#                Logilab SA        <contact@logilab.fr>
-#
-# This software may be used and distributed according to the terms of the
-# GNU General Public License version 2 or any later version.
-"""Deprecated extension that formerly introduced "Changeset Obsolescence".
-
-This concept is now partially in Mercurial core (starting with Mercurial 2.3).
-The remaining logic has been grouped with the evolve extension.
-
-Some code remains in this extensions to detect and convert prehistoric format
-of obsolete marker than early user may have create. Keep it enabled if you
-were such user.
-"""
-
-from mercurial import error
-
-try:
-    from mercurial import obsolete
-except ImportError:
-    raise error.Abort('Obsolete extension requires Mercurial 2.3 (or later)')
-
-import sys
-import json
-
-from mercurial import cmdutil
-from mercurial.i18n import _
-from mercurial.node import bin, nullid
-from mercurial import util
-
-
-#####################################################################
-### Older format management                                       ###
-#####################################################################
-
-# Code related to detection and management of older legacy format never
-# handled by core
-
-
-def reposetup(ui, repo):
-    """Detect that a repo still contains some old obsolete format
-    """
-    if not repo.local():
-        return
-    evolveopts = ui.configlist('experimental', 'evolution')
-    if not evolveopts:
-        evolveopts = 'all'
-        ui.setconfig('experimental', 'evolution', evolveopts)
-    for arg in sys.argv:
-        if 'debugc' in arg:
-            break
-    else:
-        data = repo.opener.tryread('obsolete-relations')
-        if not data:
-            data = repo.svfs.tryread('obsoletemarkers')
-        if data:
-            raise error.Abort('old format of obsolete marker detected!\n'
-                              'run `hg debugconvertobsolete` once.')
-
-def _obsdeserialize(flike):
-    """read a file like object serialized with _obsserialize
-
-    this deserialize into a {subject -> objects} mapping
-
-    this was the very first format ever."""
-    rels = {}
-    for line in flike:
-        subhex, objhex = line.split()
-        subnode = bin(subhex)
-        if subnode == nullid:
-            subnode = None
-        rels.setdefault(subnode, set()).add(bin(objhex))
-    return rels
-
-cmdtable = {}
-command = cmdutil.command(cmdtable)
-@command('debugconvertobsolete', [], '')
-def cmddebugconvertobsolete(ui, repo):
-    """import markers from an .hg/obsolete-relations file"""
-    cnt = 0
-    err = 0
-    l = repo.lock()
-    some = False
-    try:
-        unlink = []
-        tr = repo.transaction('convert-obsolete')
-        try:
-            repo._importoldobsolete = True
-            store = repo.obsstore
-            ### very first format
-            try:
-                f = repo.opener('obsolete-relations')
-                try:
-                    some = True
-                    for line in f:
-                        subhex, objhex = line.split()
-                        suc = bin(subhex)
-                        prec = bin(objhex)
-                        sucs = (suc==nullid) and [] or [suc]
-                        meta = {
-                            'date':  '%i %i' % util.makedate(),
-                            'user': ui.username(),
-                            }
-                        try:
-                            store.create(tr, prec, sucs, 0, metadata=meta)
-                            cnt += 1
-                        except ValueError:
-                            repo.ui.write_err("invalid old marker line: %s"
-                                              % (line))
-                            err += 1
-                finally:
-                    f.close()
-                unlink.append(repo.join('obsolete-relations'))
-            except IOError:
-                pass
-            ### second (json) format
-            data = repo.svfs.tryread('obsoletemarkers')
-            if data:
-                some = True
-                for oldmark in json.loads(data):
-                    del oldmark['id']  # dropped for now
-                    del oldmark['reason']  # unused until then
-                    oldobject = str(oldmark.pop('object'))
-                    oldsubjects = [str(s) for s in oldmark.pop('subjects', [])]
-                    LOOKUP_ERRORS = (error.RepoLookupError, error.LookupError)
-                    if len(oldobject) != 40:
-                        try:
-                            oldobject = repo[oldobject].node()
-                        except LOOKUP_ERRORS:
-                            pass
-                    if any(len(s) != 40 for s in oldsubjects):
-                        try:
-                            oldsubjects = [repo[s].node() for s in oldsubjects]
-                        except LOOKUP_ERRORS:
-                            pass
-
-                    oldmark['date'] = '%i %i' % tuple(oldmark['date'])
-                    meta = dict((k.encode('utf-8'), v.encode('utf-8'))
-                                 for k, v in oldmark.iteritems())
-                    try:
-                        succs = [bin(n) for n in oldsubjects]
-                        succs = [n for n in succs if n != nullid]
-                        store.create(tr, bin(oldobject), succs,
-                                     0, metadata=meta)
-                        cnt += 1
-                    except ValueError:
-                        repo.ui.write_err("invalid marker %s -> %s\n"
-                                     % (oldobject, oldsubjects))
-                        err += 1
-                unlink.append(repo.sjoin('obsoletemarkers'))
-            tr.close()
-            for path in unlink:
-                util.unlink(path)
-        finally:
-            tr.release()
-    finally:
-        del repo._importoldobsolete
-        l.release()
-    if not some:
-        ui.warn(_('nothing to do\n'))
-    ui.status('%i obsolete marker converted\n' % cnt)
-    if err:
-        ui.write_err('%i conversion failed. check you graph!\n' % err)