rebase: lock the repo during the full rebase operation stable

rebase: lock the repo during the full rebase operation

Running `hg pull --rebase` would move bookmarks without any repository locking.
So we now lock the repository. For good measure and avoiding sneaky race
conditions, we lock the repository for the whole operation.

There is no code change besides the indentation.

--- a/hgext/rebase.py	Tue Aug 11 16:26:12 2015 -0700
+++ b/hgext/rebase.py	Tue Aug 11 16:45:11 2015 -0700
@@ -1026,40 +1026,46 @@
 def pullrebase(orig, ui, repo, *args, **opts):
     'Call rebase after pull if the latter has been invoked with --rebase'
     if opts.get('rebase'):
-        if opts.get('update'):
-            del opts['update']
-            ui.debug('--update and --rebase are not compatible, ignoring '
-                     'the update flag\n')
+        wlock = lock = None
+        try:
+            wlock = repo.wlock()
+            lock = repo.lock()
+            if opts.get('update'):
+                del opts['update']
+                ui.debug('--update and --rebase are not compatible, ignoring '
+                         'the update flag\n')
 
-        movemarkfrom = repo['.'].node()
-        revsprepull = len(repo)
-        origpostincoming = commands.postincoming
-        def _dummy(*args, **kwargs):
-            pass
-        commands.postincoming = _dummy
-        try:
-            orig(ui, repo, *args, **opts)
+            movemarkfrom = repo['.'].node()
+            revsprepull = len(repo)
+            origpostincoming = commands.postincoming
+            def _dummy(*args, **kwargs):
+                pass
+            commands.postincoming = _dummy
+            try:
+                orig(ui, repo, *args, **opts)
+            finally:
+                commands.postincoming = origpostincoming
+            revspostpull = len(repo)
+            if revspostpull > revsprepull:
+                # --rev option from pull conflict with rebase own --rev
+                # dropping it
+                if 'rev' in opts:
+                    del opts['rev']
+                # positional argument from pull conflicts with rebase's own
+                # --source.
+                if 'source' in opts:
+                    del opts['source']
+                rebase(ui, repo, **opts)
+                branch = repo[None].branch()
+                dest = repo[branch].rev()
+                if dest != repo['.'].rev():
+                    # there was nothing to rebase we force an update
+                    hg.update(repo, dest)
+                    if bookmarks.update(repo, [movemarkfrom], repo['.'].node()):
+                        ui.status(_("updating bookmark %s\n")
+                                  % repo._activebookmark)
         finally:
-            commands.postincoming = origpostincoming
-        revspostpull = len(repo)
-        if revspostpull > revsprepull:
-            # --rev option from pull conflict with rebase own --rev
-            # dropping it
-            if 'rev' in opts:
-                del opts['rev']
-            # positional argument from pull conflicts with rebase's own
-            # --source.
-            if 'source' in opts:
-                del opts['source']
-            rebase(ui, repo, **opts)
-            branch = repo[None].branch()
-            dest = repo[branch].rev()
-            if dest != repo['.'].rev():
-                # there was nothing to rebase we force an update
-                hg.update(repo, dest)
-                if bookmarks.update(repo, [movemarkfrom], repo['.'].node()):
-                    ui.status(_("updating bookmark %s\n")
-                              % repo._activebookmark)
+            release(lock, wlock)
     else:
         if opts.get('tool'):
             raise util.Abort(_('--tool can only be used with --rebase'))