test: add test for udev_event_spawn()

src/udev/meson.build

@@ -191,6 +191,12 @@ fuzzers += [
 ]
 
 tests += [
+        [['src/udev/test-udev-event.c'],
+         [libudevd_core,
+          libshared],
+         [threads,
+          libacl]],
+
         [['src/udev/fido_id/test-fido-id-desc.c',
           'src/udev/fido_id/fido_id_desc.c']],
 ]

src/udev/test-udev-event.c

@@ -0,0 +1,108 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "path-util.h"
+#include "signal-util.h"
+#include "strv.h"
+#include "tests.h"
+#include "udev-event.h"
+#include "util.h"
+
+#define BUF_SIZE 1024
+
+static void test_event_spawn_core(bool with_pidfd, const char *cmd, char result_buf[BUF_SIZE]) {
+        _cleanup_(sd_device_unrefp) sd_device *dev = NULL;
+        _cleanup_(udev_event_freep) UdevEvent *event = NULL;
+
+        assert_se(setenv("SYSTEMD_PIDFD", yes_no(with_pidfd), 1) >= 0);
+
+        assert_se(sd_device_new_from_syspath(&dev, "/sys/class/net/lo") >= 0);
+        assert_se(event = udev_event_new(dev, 0, NULL, LOG_DEBUG));
+        assert_se(udev_event_spawn(event, 5 * USEC_PER_SEC, SIGKILL, false, cmd, result_buf, BUF_SIZE) == 0);
+
+        assert_se(unsetenv("SYSTEMD_PIDFD") >= 0);
+}
+
+static void test_event_spawn_cat(bool with_pidfd) {
+        _cleanup_strv_free_ char **lines = NULL;
+        _cleanup_free_ char *cmd = NULL;
+        char result_buf[BUF_SIZE];
+
+        log_debug("/* %s(%s) */", __func__, yes_no(with_pidfd));
+
+        assert_se(find_executable("cat", &cmd) >= 0);
+        assert_se(strextend_with_separator(&cmd, " ", "/sys/class/net/lo/uevent"));
+
+        test_event_spawn_core(with_pidfd, cmd, result_buf);
+
+        assert_se(lines = strv_split_newlines(result_buf));
+        strv_print(lines);
+
+        assert_se(strv_contains(lines, "INTERFACE=lo"));
+        assert_se(strv_contains(lines, "IFINDEX=1"));
+}
+
+static void test_event_spawn_self(const char *self, const char *arg, bool with_pidfd) {
+        _cleanup_strv_free_ char **lines = NULL;
+        _cleanup_free_ char *cmd = NULL;
+        char result_buf[BUF_SIZE];
+
+        log_debug("/* %s(%s, %s) */", __func__, arg, yes_no(with_pidfd));
+
+        assert_se(cmd = strjoin(self, " ", arg));
+
+        test_event_spawn_core(with_pidfd, cmd, result_buf);
+
+        assert_se(lines = strv_split_newlines(result_buf));
+        strv_print(lines);
+
+        assert_se(strv_contains(lines, "aaa"));
+        assert_se(strv_contains(lines, "bbb"));
+}
+
+static void test1(void) {
+        fprintf(stdout, "aaa\nbbb");
+        fprintf(stderr, "ccc\nddd");
+}
+
+static void test2(void) {
+        char buf[16384];
+
+        fprintf(stdout, "aaa\nbbb");
+
+        memset(buf, 'a', sizeof(buf) - 1);
+        char_array_0(buf);
+        fputs(buf, stderr);
+}
+
+int main(int argc, char *argv[]) {
+        _cleanup_free_ char *self = NULL;
+
+        if (argc > 1) {
+                if (streq(argv[1], "test1"))
+                        test1();
+                else if (streq(argv[1], "test2"))
+                        test2();
+                else
+                        assert_not_reached("unknown command.");
+
+                return 0;
+        }
+
+        test_setup_logging(LOG_DEBUG);
+
+        assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGCHLD, -1) >= 0);
+
+        test_event_spawn_cat(true);
+        test_event_spawn_cat(false);
+
+        assert_se(path_make_absolute_cwd(argv[0], &self) >= 0);
+        path_simplify(self, true);
+
+        test_event_spawn_self(self, "test1", true);
+        test_event_spawn_self(self, "test1", false);
+
+        test_event_spawn_self(self, "test2", true);
+        test_event_spawn_self(self, "test2", false);
+
+        return 0;
+}