git: Do not disable commit hook for temporary working tree

We exclude .git/hooks from symlinking into the temporary working tree,
which avoids the commit hook being run for the temporary branch anyway.
This avoids the wiki not being updated if an orthogonal change is
received in process A, while process B prepares a revert that is
subsequently cancelled.

IkiWiki/Plugin/git.pm

@@ -1038,10 +1038,6 @@ sub rcs_preprevert ($) {
 		my $failure;
 		my @ret;
 		eval {
-			IkiWiki::disable_commit_hook();
-			push @undo, sub {
-				IkiWiki::enable_commit_hook();
-			};
 			my $branch = "ikiwiki_revert_${sha1}"; # supposed to be unique
 
 			push @undo, sub {

debian/changelog

@@ -2,6 +2,7 @@ ikiwiki (3.20161229.1) UNRELEASED; urgency=medium
 
   * git: Attribute reverts to the user doing the revert, not the wiki
     itself.
+  * git: Do not disable the commit hook while preparing a revert.
 
  -- Simon McVittie <smcv@debian.org>  Thu, 29 Dec 2016 20:35:51 +0000