diff tests/test-narrow-share.t @ 41298:88a7c211b21e stable

narrow: fix crash when restoring backup in legacy repo

Using --addremove when committing in an old repo (before we started
keeping .hg/narrowspec.dirstate) results in a crash. The test
case modified in this patch would crash like this:

  abort: $ENOENT$

The issue is that when the dirstateguard is aborted, it tries to
restore the backup of .hg/narrowspec.dirstate. However, since we were
in an old repo, that file did not get created when the dirstateguard
was created. Note that the dirstateguard is not used unless
--addremove is passed.

This patch fixes the bug by making restorewcbackup() not fail if the
backup doesn't exist. I also made clearwcbackup() safe, just in case.

Differential Revision: https://phab.mercurial-scm.org/D5634

--- a/tests/test-narrow-share.t	Fri Jan 18 14:21:47 2019 +0100
+++ b/tests/test-narrow-share.t	Fri Jan 18 23:32:26 2019 -0800
@@ -166,7 +166,7 @@
   R d7/f
 Make it look like a repo from before narrow+share was supported
   $ rm .hg/narrowspec.dirstate
-  $ hg st
+  $ hg ci -Am test
   abort: working copy's narrowspec is stale
   (run 'hg tracked --update-working-copy')
   [255]