From 6fcfaee94884980fa294ba549b276c87b1720d03 Mon Sep 17 00:00:00 2001
From: Colin Walters <walters@verbum.org>
Date: Wed, 3 Feb 2021 20:50:59 +0000
Subject: [PATCH] ci: Don't assume HEAD exists

For some reason the way Prow clones the repo it doesn't exist;
the git default of `..` should work though.
---
 ci/ci-commitmessage-submodules.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/ci/ci-commitmessage-submodules.sh b/ci/ci-commitmessage-submodules.sh
index edc0d780..2e581262 100755
--- a/ci/ci-commitmessage-submodules.sh
+++ b/ci/ci-commitmessage-submodules.sh
@@ -16,8 +16,8 @@ dn=$(dirname $0)
 # It's very common for people to accidentally change submodules, and having this
 # requirement is a small hurdle to pass.
 
-# If passed the commit, use that. Otherwise, just use HEAD.
-HEAD=${1:-HEAD}
+# If passed the commit, use that. Otherwise, just use the implicit default.
+HEAD=${1:-}
 
 tmpd=$(mktemp -d)
 touch ${tmpd}/.tmpdir