strip: enhance repair.strip to receive a list of nodes (issue3299)

Originally, mq.strip called repair.strip a single rev at a time.
repair.strip stores in a backup bundle any revision greater than
the revision being stripped, strips, then restores the backup with
repo.addchangegroup. So, when stripping revisions on more than one
topological branch, some could end up being restored from the backup
bundle, only to be later removed by a subsequent repair.strip call.

But repo.addchangegroup calls hooks for all those restore operations.
And 9df9444e96ec changed it to delay all hook calls until the
repository lock were released - by mq.strip, after stripping all
revisions. Thus, the hooks could be called over revisions already
removed from the repository at that point.

By generating the revision lists at once inside repo.strip, we avoid
calling addchangegroup for temporary restores. Incidentally, this
also avoids creating many backup files for a single strip command.

hgext/mq.py

@@ -1043,8 +1043,7 b' class queue(object):'
                 repo.dirstate.write()
 
             self.removeundo(repo)
-            for rev in revs:
-                repair.strip(self.ui, repo, rev, backup)
+            repair.strip(self.ui, repo, revs, backup)
             # strip may have unbundled a set of backed up revisions after
             # the actual strip
             self.removeundo(repo)

mercurial/repair.py

@@ -54,10 +54,13 b' def _collectbrokencsets(repo, files, str'
 
     return s
 
-def strip(ui, repo, node, backup="all"):
+def strip(ui, repo, nodelist, backup="all"):
     cl = repo.changelog
     # TODO delete the undo files, and handle undo of merge sets
-    striprev = cl.rev(node)
+    if isinstance(nodelist, str):
+        nodelist = [nodelist]
+    striplist = [cl.rev(node) for node in nodelist]
+    striprev = min(striplist)
 
     keeppartialbundle = backup == 'strip'
 
@@ -68,8 +71,10 b' def strip(ui, repo, node, backup="all"):'
     # the list of heads and bases of the set of interesting revisions.
     # (head = revision in the set that has no descendant in the set;
     #  base = revision in the set that has no ancestor in the set)
-    tostrip = set(cl.descendants(striprev))
-    tostrip.add(striprev)
+    tostrip = set(striplist)
+    for rev in striplist:
+        for desc in cl.descendants(rev):
+            tostrip.add(desc)
 
     files = _collectfiles(repo, striprev)
     saverevs = _collectbrokencsets(repo, files, striprev)
@@ -88,6 +93,7 b' def strip(ui, repo, node, backup="all"):'
         descendants = set(cl.descendants(*saverevs))
         saverevs.difference_update(descendants)
     savebases = [cl.node(r) for r in saverevs]
+    stripbases = [cl.node(r) for r in tostrip]
 
     bm = repo._bookmarks
     updatebm = []
@@ -99,7 +105,7 b' def strip(ui, repo, node, backup="all"):'
     # create a changegroup for all the branches we need to keep
     backupfile = None
     if backup == "all":
-        backupfile = _bundle(repo, [node], cl.heads(), node, 'backup')
+        backupfile = _bundle(repo, stripbases, cl.heads(), node, 'backup')
         repo.ui.status(_("saved backup bundle to %s\n") % backupfile)
     if saveheads or savebases:
         # do not compress partial bundle if we remove it from disk later

tests/test-mq-strip.t

@@ -311,7 +311,6 b' 2 different branches: 2 strips'
   $ hg strip 2 4
   0 files updated, 0 files merged, 0 files removed, 0 files unresolved
   saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
-  saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
   $ hg glog
   @  changeset:   2:65bd5f99a4a3
   |  tag:         tip
@@ -421,3 +420,13 b' Verify strip protects against stripping '
   $ hg status
   M bar
   ? b
+  $ cd ..
+
+stripping many nodes on a complex graph (issue3299)
+
+  $ hg init issue3299
+  $ cd issue3299
+  $ hg debugbuilddag '@a.:a@b.:b.:x<a@a.:a<b@b.:b<a@a.:a'
+  $ hg strip 'not ancestors(x)'
+  saved backup bundle to $TESTTMP/issue3299/.hg/strip-backup/*-backup.hg (glob)
+