From 48b16ab231bc20ad86dc94bcf64647a83d374a2b Mon Sep 17 00:00:00 2001
From: "Eric W. Biederman" <ebiederm@xmission.com>
Date: Sun, 1 Oct 2023 21:40:31 -0500
Subject: [PATCH] test-lib: compute the compatibility hash so tests may use it

Inspired-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 t/test-lib-functions.sh | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
index 2f8868caa171d2..92b462e2e7111f 100644
--- a/t/test-lib-functions.sh
+++ b/t/test-lib-functions.sh
@@ -1599,7 +1599,16 @@ test_set_hash () {
 
 # Detect the hash algorithm in use.
 test_detect_hash () {
-	test_hash_algo="${GIT_TEST_DEFAULT_HASH:-sha1}"
+	case "$GIT_TEST_DEFAULT_HASH" in
+	"sha256")
+	    test_hash_algo=sha256
+	    test_compat_hash_algo=sha1
+	    ;;
+	*)
+	    test_hash_algo=sha1
+	    test_compat_hash_algo=sha256
+	    ;;
+	esac
 }
 
 # Load common hash metadata and common placeholder object IDs for use with
@@ -1651,6 +1660,12 @@ test_oid () {
 	local algo="${test_hash_algo}" &&
 
 	case "$1" in
+	--hash=storage)
+		algo="$test_hash_algo" &&
+		shift;;
+	--hash=compat)
+		algo="$test_compat_hash_algo" &&
+		shift;;
 	--hash=*)
 		algo="${1#--hash=}" &&
 		shift;;