Test suite: Provide t-sametree-parent

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

1 files changed, 22 insertions, 0 deletions

diff --git a/tests/lib b/tests/lib
index 9b8894e..36237a7 100644
--- a/tests/lib
+++ b/tests/lib
@@ -508,6 +508,28 @@ t-v-tag () {
 	echo refs/tags/$tagpfx/${v//\~/_}
 }
 
+t-format-ref () {
+	git log -n1 --pretty=format:"$1" "$2"
+}
+
+t-sametree-parent () {
+	local ref=$1
+	local parent
+	local ctree=$(t-format-ref '%T' "$ref")
+	while :; do
+		local psame=''
+		for parent in $(t-format-ref '%P' "$ref"); do
+			local ptree=$(t-format-ref '%T' "$parent")
+			if [ "x$ptree" = "x$ctree" ]; then
+				psame+=" $parent"
+			fi
+		done
+		case "$psame" in ""|" * *") break ;; esac
+		ref="${psame# }"
+	done
+	echo "$ref"
+}
+
 t-check-pushed-master () {
 	local master=`t-git-get-ref refs/heads/master`
 	if [ x$master = x$t_ref_val ]; then return; fi