From fd613a23cb8763da1ac47fcd1d7faacc8fd550d2 Mon Sep 17 00:00:00 2001
From: Mike Yuan <me@yhndnzj.com>
Date: Thu, 13 Jul 2023 23:13:10 +0800
Subject: [PATCH] fstab-util: add fstab_is_bind

(cherry picked from commit 35df78cd88e784abafd5df4545feeb3dd98e14a4)

Related: #2190226
---
 src/core/mount.c        |  9 +--------
 src/shared/fstab-util.c | 13 +++++++++++++
 src/shared/fstab-util.h |  2 ++
 3 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/src/core/mount.c b/src/core/mount.c
index ba55f7dd86..a46ac804d8 100644
--- a/src/core/mount.c
+++ b/src/core/mount.c
@@ -119,14 +119,7 @@ static bool mount_is_loop(const MountParameters *p) {
 
 static bool mount_is_bind(const MountParameters *p) {
         assert(p);
-
-        if (fstab_test_option(p->options, "bind\0" "rbind\0"))
-                return true;
-
-        if (p->fstype && STR_IN_SET(p->fstype, "bind", "rbind"))
-                return true;
-
-        return false;
+        return fstab_is_bind(p->options, p->fstype);
 }
 
 static bool mount_is_bound_to_device(Mount *m) {
diff --git a/src/shared/fstab-util.c b/src/shared/fstab-util.c
index f683f05981..35e0d0d6f7 100644
--- a/src/shared/fstab-util.c
+++ b/src/shared/fstab-util.c
@@ -19,6 +19,8 @@ int fstab_has_fstype(const char *fstype) {
         _cleanup_endmntent_ FILE *f = NULL;
         struct mntent *m;
 
+        assert(fstype);
+
         f = setmntent(fstab_path(), "re");
         if (!f)
                 return errno == ENOENT ? false : -errno;
@@ -286,3 +288,14 @@ char *fstab_node_to_udev_node(const char *p) {
 
         return strdup(p);
 }
+
+bool fstab_is_bind(const char *options, const char *fstype) {
+
+        if (fstab_test_option(options, "bind\0" "rbind\0"))
+                return true;
+
+        if (fstype && STR_IN_SET(fstype, "bind", "rbind"))
+                return true;
+
+        return false;
+}
diff --git a/src/shared/fstab-util.h b/src/shared/fstab-util.h
index 6b596baafa..5979b476b6 100644
--- a/src/shared/fstab-util.h
+++ b/src/shared/fstab-util.h
@@ -40,3 +40,5 @@ char *fstab_node_to_udev_node(const char *p);
 static inline const char* fstab_path(void) {
         return secure_getenv("SYSTEMD_FSTAB") ?: "/etc/fstab";
 }
+
+bool fstab_is_bind(const char *options, const char *fstype);