basic,shared: move make_mount_point_inode_*() to shared/

Those pull in selinux for labelling, and we should avoid selinux in basic/.

src/shared/mount-util.c

@@ -16,6 +16,7 @@
 #include "fileio.h"
 #include "fs-util.h"
 #include "hashmap.h"
+#include "label.h"
 #include "libmount-util.h"
 #include "missing_mount.h"
 #include "missing_syscall.h"
@@ -1071,3 +1072,25 @@ int remount_idmap(
 
         return 0;
 }
+
+int make_mount_point_inode_from_stat(const struct stat *st, const char *dest, mode_t mode) {
+        assert(st);
+        assert(dest);
+
+        if (S_ISDIR(st->st_mode))
+                return mkdir_label(dest, mode);
+        else
+                return mknod(dest, S_IFREG|(mode & ~0111), 0);
+}
+
+int make_mount_point_inode_from_path(const char *source, const char *dest, mode_t mode) {
+        struct stat st;
+
+        assert(source);
+        assert(dest);
+
+        if (stat(source, &st) < 0)
+                return -errno;
+
+        return make_mount_point_inode_from_stat(&st, dest, mode);
+}

src/shared/mount-util.h

@@ -3,6 +3,7 @@
 
 #include <mntent.h>
 #include <stdio.h>
+#include <sys/stat.h>
 #include <unistd.h>
 
 #include "alloc-util.h"
@@ -108,3 +109,7 @@ int mount_image_in_namespace(pid_t target, const char *propagate_path, const cha
 int make_mount_point(const char *path);
 
 int remount_idmap(const char *p, uid_t uid_shift, uid_t uid_range);
+
+/* Creates a mount point (not parents) based on the source path or stat - ie, a file or a directory */
+int make_mount_point_inode_from_stat(const struct stat *st, const char *dest, mode_t mode);
+int make_mount_point_inode_from_path(const char *source, const char *dest, mode_t mode);