fs-util: replace symlink_atomic() by symlinkat_atomic()

src/basic/fs-util.c

@@ -432,7 +432,7 @@ int symlink_idempotent(const char *from, const char *to, bool make_relative) {
         return 0;
 }
 
-int symlink_atomic_full(const char *from, const char *to, bool make_relative) {
+int symlinkat_atomic_full(const char *from, int atfd, const char *to, bool make_relative) {
         _cleanup_free_ char *relpath = NULL, *t = NULL;
         int r;
 
@@ -451,12 +451,13 @@ int symlink_atomic_full(const char *from, const char *to, bool make_relative) {
         if (r < 0)
                 return r;
 
-        if (symlink(from, t) < 0)
+        if (symlinkat(from, atfd, t) < 0)
                 return -errno;
 
-        if (rename(t, to) < 0) {
-                unlink_noerrno(t);
-                return -errno;
+        r = RET_NERRNO(renameat(atfd, t, atfd, to));
+        if (r < 0) {
+                (void) unlinkat(atfd, t, 0);
+                return r;
         }
 
         return 0;

src/basic/fs-util.h

@@ -58,9 +58,9 @@ static inline int touch(const char *path) {
 
 int symlink_idempotent(const char *from, const char *to, bool make_relative);
 
-int symlink_atomic_full(const char *from, const char *to, bool make_relative);
+int symlinkat_atomic_full(const char *from, int atfd, const char *to, bool make_relative);
 static inline int symlink_atomic(const char *from, const char *to) {
-        return symlink_atomic_full(from, to, false);
+        return symlinkat_atomic_full(from, AT_FDCWD, to, false);
 }
 int mknod_atomic(const char *path, mode_t mode, dev_t dev);
 int mkfifo_atomic(const char *path, mode_t mode);

src/shared/label.c

@@ -71,7 +71,7 @@ int symlink_atomic_full_label(const char *from, const char *to, bool make_relati
         if (r < 0)
                 return r;
 
-        r = symlink_atomic_full(from, to, make_relative);
+        r = symlinkat_atomic_full(from, AT_FDCWD, to, make_relative);
         mac_selinux_create_file_clear();
 
         if (r < 0)