# HG changeset patch
# User Martin von Zweigbergk <martinvonz@google.com>
# Date 2020-01-15 23:07:43
# Node ID ff22c76825b90af6b47071060d9e309edab579ab
# Parent  50e7ce1f96d1a10e462e02f7db5d7f8d93fc00df

merge: don't call update hook when using in-memory context

I'm pretty sure many hook implementors will assume that they can
inspect the working copy and/or dirstate parents when the hook is
called, so I don't think we should call the hook when using an
in-memory context. The new behavior matches that of the preupdate
hook.

Differential Revision: https://phab.mercurial-scm.org/D7898

diff --git a/mercurial/merge.py b/mercurial/merge.py
--- a/mercurial/merge.py
+++ b/mercurial/merge.py
@@ -2574,7 +2574,7 @@ def update(
     if not branchmerge:
         sparse.prunetemporaryincludes(repo)
 
-    if not partial:
+    if updatedirstate:
         repo.hook(
             b'update', parent1=xp1, parent2=xp2, error=stats.unresolvedcount
         )