From 68fdc72cfe19777b8f39a6a13b659e79ead4bee9 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Mon, 7 Dec 2020 14:15:36 +0100
Subject: [PATCH] test: add test that dlopen()'s all our weak library deps once

This test should ensure we notice if distros update shared libraries
that broke so name, and we still use the old soname.

(In contrast to what the commit summary says, this currently doesn#t
cover really all such deps, specifically xkbcommon and PCRE are missing,
since they currently aren't loaded from src/shared/. This is stuff to
fix later)
---
 src/test/meson.build      |  4 ++++
 src/test/test-dlopen-so.c | 40 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+)
 create mode 100644 src/test/test-dlopen-so.c

diff --git a/src/test/meson.build b/src/test/meson.build
index 9e781f88dc..3afe5d58cb 100644
--- a/src/test/meson.build
+++ b/src/test/meson.build
@@ -71,6 +71,10 @@ tests += [
           libshared],
          []],
 
+        [['src/test/test-dlopen-so.c'],
+         [libshared],
+         []],
+
         [['src/test/test-job-type.c'],
          [libcore,
           libshared],
diff --git a/src/test/test-dlopen-so.c b/src/test/test-dlopen-so.c
new file mode 100644
index 0000000000..6436dc600f
--- /dev/null
+++ b/src/test/test-dlopen-so.c
@@ -0,0 +1,40 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <dlfcn.h>
+#include <stdlib.h>
+
+#include "cryptsetup-util.h"
+#include "idn-util.h"
+#include "macro.h"
+#include "main-func.h"
+#include "pwquality-util.h"
+#include "qrcode-util.h"
+#include "tests.h"
+
+static int run(int argc, char **argv) {
+        test_setup_logging(LOG_DEBUG);
+
+        /* Try to load each of our weak library dependencies once. This is supposed to help finding cases
+         * where .so versions change and distributions update, but systemd doesn't have the new so names
+         * around yet. */
+
+#if HAVE_LIBIDN2 || HAVE_LIBIDN
+        assert_se(dlopen_idn() >= 0);
+#endif
+
+#if HAVE_LIBCRYPTSETUP
+        assert_se(dlopen_cryptsetup() >= 0);
+#endif
+
+#if HAVE_PWQUALITY
+        assert_se(dlopen_pwquality() >= 0);
+#endif
+
+#if HAVE_QRENCODE
+        assert_se(dlopen_qrencode() >= 0);
+#endif
+
+        return 0;
+}
+
+DEFINE_MAIN_FUNCTION(run);