+static int fake_filesystems(void) {
+ static const struct fakefs {
+ const char *src;
+ const char *target;
+ const char *error;
+ } fakefss[] = {
+ { "test/sys", "/sys", "failed to mount test /sys" },
+ { "test/dev", "/dev", "failed to mount test /dev" },
+ { "test/run", "/run", "failed to mount test /run" },
+ { "test/run", "/etc/udev/rules.d", "failed to mount empty /etc/udev/rules.d" },
+ { "test/run", "/usr/lib/udev/rules.d", "failed to mount empty /usr/lib/udev/rules.d" },
+ };
+ unsigned int i;
+ int err;
+
+ err = unshare(CLONE_NEWNS);
+ if (err < 0) {
+ err = -errno;
+ fprintf(stderr, "failed to call unshare(): %m\n");
+ goto out;
+ }
+
+ if (mount(NULL, "/", NULL, MS_PRIVATE|MS_REC, NULL) < 0) {
+ err = -errno;
+ fprintf(stderr, "failed to mount / as private: %m\n");
+ goto out;
+ }
+
+ for (i = 0; i < ELEMENTSOF(fakefss); i++) {
+ err = mount(fakefss[i].src, fakefss[i].target, NULL, MS_BIND, NULL);
+ if (err < 0) {
+ err = -errno;
+ fprintf(stderr, "%s %m", fakefss[i].error);
+ return err;
+ }
+ }
+out:
+ return err;
+}
+
+int main(int argc, char *argv[]) {
+ _cleanup_udev_unref_ struct udev *udev = NULL;
+ _cleanup_udev_event_unref_ struct udev_event *event = NULL;
+ _cleanup_udev_device_unref_ struct udev_device *dev = NULL;
+ _cleanup_udev_rules_unref_ struct udev_rules *rules = NULL;