+static struct dual_timestamp* parse_initrd_timestamp(struct dual_timestamp *t) {
+ const char *e;
+ unsigned long long a, b;
+
+ assert(t);
+
+ if (!(e = getenv("RD_TIMESTAMP")))
+ return NULL;
+
+ if (sscanf(e, "%llu %llu", &a, &b) != 2)
+ return NULL;
+
+ t->realtime = (usec_t) a;
+ t->monotonic = (usec_t) b;
+
+ return t;
+}
+
+static void test_mtab(void) {
+ char *p;
+
+ /* Check that /etc/mtab is a symlink */
+
+ if (readlink_malloc("/etc/mtab", &p) >= 0) {
+ bool b;
+
+ b = streq(p, "/proc/self/mounts") || streq(p, "/proc/mounts");
+ free(p);
+
+ if (b)
+ return;
+ }
+
+ log_warning("/etc/mtab is not a symlink or not pointing to /proc/self/mounts. "
+ "This is not supported anymore. "
+ "Please make sure to replace this file by a symlink to avoid incorrect or misleading mount(8) output.");
+}
+
+static void test_usr(void) {
+ struct stat a, b;
+ bool seperate = false;
+
+ /* Check that /usr is not a seperate fs */
+
+ if (lstat("/", &a) >= 0 && lstat("/usr", &b) >= 0)
+ if (a.st_dev != b.st_dev)
+ seperate = true;
+
+ /* This check won't work usually during boot, since /usr is
+ * probably not mounted yet, hence let's add a second
+ * check. We just check whether /usr is an empty directory. */
+
+ if (dir_is_empty("/usr") > 0)
+ seperate = true;
+
+ if (!seperate)
+ return;
+
+ log_warning("/usr appears to be on a different file system than /. This is not supported anymore. "
+ "Some things will probably break (sometimes even silently) in mysterious ways.");
+}
+