# HG changeset patch
# User Pulkit Goyal <7895pulkit@gmail.com>
# Date 1602855189 -19800
# Node ID aba4f2c97e742d78e4735d3ec3becf0b45658d52
# Parent  ac565222b9f833d87e852fcae6d2974266ee71eb
scmutil: try-delete `.hg/store/requires` if store requirements are empty

When downgrading from a shared-safe repository to non-shared-safe repository, we
end up in a case where we had requirements stored in `.hg/store/requires` but no
longer want them there.

Let's explicitly try delete the `.hg/store/requires` file if store requirements
are empty.

Differential Revision: https://phab.mercurial-scm.org/D9357

diff -r ac565222b9f8 -r aba4f2c97e74 mercurial/scmutil.py
--- a/mercurial/scmutil.py	Mon Nov 23 10:39:51 2020 -0800
+++ b/mercurial/scmutil.py	Fri Oct 16 19:03:09 2020 +0530
@@ -1580,6 +1580,9 @@
         writerequires(repo.vfs, wcreq)
     if storereq is not None:
         writerequires(repo.svfs, storereq)
+    elif repo.ui.configbool(b'format', b'usestore'):
+        # only remove store requires if we are using store
+        repo.svfs.tryunlink(b'requires')
 
 
 def writerequires(opener, requirements):