1 file changed, 22 insertions, 0 deletions
diff --git a/tests/extensions/lib.sh b/tests/extensions/lib.sh
index 56098d0..041a042 100644
--- a/tests/extensions/lib.sh
+++ b/tests/extensions/lib.sh
@@ -67,6 +67,28 @@ lua_module_prereq() {
 	fi
 }
 
+# Runs the command given with every Lua search path pointed at an empty
+# directory, so no Lua it starts, cgit's own included, finds a module that
+# is not built in. A fallback for a missing module then runs on any machine.
+without_lua_modules() {
+	mkdir -p "$TRASH_DIRECTORY/no-lua-modules" &&
+	(
+		for lua_variable in LUA_PATH LUA_PATH_5_2 LUA_PATH_5_3 \
+			LUA_PATH_5_4 LUA_PATH_5_5
+		do
+			eval "$lua_variable=\$TRASH_DIRECTORY/no-lua-modules/?.lua"
+			export $lua_variable
+		done
+		for lua_variable in LUA_CPATH LUA_CPATH_5_2 LUA_CPATH_5_3 \
+			LUA_CPATH_5_4 LUA_CPATH_5_5
+		do
+			eval "$lua_variable=\$TRASH_DIRECTORY/no-lua-modules/?.so"
+			export $lua_variable
+		done
+		"$@"
+	)
+}
+
 # Asks whether cgit's own Lua can require every module named, by pointing a
 # throwaway commit-filter at the given repository and reading its answer off
 # the rendered commit page. Filters need a page to run on, which is why a