ns: export prepare_userns_creds()

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

criu/include/namespaces.h

@@ -157,6 +157,7 @@ extern int dump_mnt_namespaces(void);
 extern int dump_namespaces(struct pstree_item *item, unsigned int ns_flags);
 extern int prepare_namespace_before_tasks(void);
 extern int prepare_namespace(struct pstree_item *item, unsigned long clone_flags);
+extern int prepare_userns_creds(void);
 
 extern int switch_ns(int pid, struct ns_desc *nd, int *rst);
 extern int switch_ns_by_fd(int nsfd, struct ns_desc *nd, int *rst);

criu/namespaces.c

@@ -1537,7 +1537,7 @@ int collect_namespaces(bool for_dump)
 	return 0;
 }
 
-static int prepare_userns_creds(void)
+int prepare_userns_creds(void)
 {
 	/* UID and GID must be set after restoring /proc/PID/{uid,gid}_maps */
 	if (setuid(0) || setgid(0) || setgroups(0, NULL)) {