tests: commit-msg hook from subdir

Author: jpgrayson

t/t7504-commit-msg-hook.sh

@@ -270,7 +270,11 @@ test_expect_success 'refresh --no-verify with non-executable hook (editor)' '
 
 # now a hook that edits the commit message
 write_script "$HOOK" <<-'EOF'
-	echo "new message" >"$1"
+	if test -d .git; then
+	    echo "new message" >"$1"
+	else
+	    echo "not in work root" >"$1"
+	fi
 	exit 0
 	EOF
 
@@ -279,6 +283,16 @@ test_expect_success 'new hook edits commit message' '
     commit_msg_is "new message"
 '
 
+test_expect_success 'commit-msg run from subdir' '
+    mkdir -p dir0/dir1 &&
+    (
+        cd dir0/dir1 &&
+        stg new -m from-subdir
+    ) &&
+    commit_msg_is "new message" &&
+    stg delete from-subdir
+'
+
 test_expect_success "new hook doesn't edit commit message" '
     stg new --no-verify -m "plus" plus &&
     commit_msg_is "plus"