shared: Clean up includes

Split out of #37344.

src/shared/fstab-util.c

@@ -1,6 +1,5 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
-#include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 
@@ -11,7 +10,7 @@
 #include "fstab-util.h"
 #include "initrd-util.h"
 #include "libmount-util.h"
-#include "macro.h"
+#include "log.h"
 #include "nulstr-util.h"
 #include "parse-util.h"
 #include "path-util.h"
@@ -393,6 +392,10 @@ char* fstab_node_to_udev_node(const char *p) {
         return strdup(p);
 }
 
+const char* fstab_path(void) {
+        return secure_getenv("SYSTEMD_FSTAB") ?: "/etc/fstab";
+}
+
 bool fstab_is_bind(const char *options, const char *fstype) {
 
         if (fstab_test_option(options, "bind\0" "rbind\0"))