test: add a test for mkdir_p()

src/test/meson.build

@@ -193,6 +193,8 @@ tests += [
 
         [files('test-macro.c')],
 
+        [files('test-mkdir.c')],
+
         [files('test-json.c')],
 
         [files('test-modhex.c')],

src/test/test-mkdir.c

@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <unistd.h>
+
+#include "mkdir.h"
+#include "path-util.h"
+#include "rm-rf.h"
+#include "tests.h"
+#include "tmpfile-util.h"
+
+TEST(mkdir_p) {
+        _cleanup_(rm_rf_physical_and_freep) char *tmp = NULL;
+        _cleanup_free_ char *p = NULL;
+
+        assert_se(mkdtemp_malloc("/tmp/test-mkdir-XXXXXX", &tmp) >= 0);
+
+        assert_se(p = path_join(tmp, "run"));
+        assert_se(mkdir_p(p, 0755) >= 0);
+
+        p = mfree(p);
+        assert_se(p = path_join(tmp, "var/run"));
+        assert_se(mkdir_parents(p, 0755) >= 0);
+        assert_se(symlink("../run", p) >= 0);
+
+        p = mfree(p);
+        assert_se(p = path_join(tmp, "var/run/hoge/foo/baz"));
+        assert_se(mkdir_p(p, 0755) >= 0);
+}
+
+DEFINE_TEST_MAIN(LOG_DEBUG);