attach: use new mount api

src/lxc/attach.c

@@ -39,6 +39,7 @@
 #include "macro.h"
 #include "mainloop.h"
 #include "memory_utils.h"
+#include "mount_utils.h"
 #include "namespace.h"
 #include "process_utils.h"
 #include "syscall_wrappers.h"
@@ -202,7 +203,7 @@ int lxc_attach_remount_sys_proc(void)
 	if (ret < 0)
 		return log_error_errno(-1, errno, "Failed to unmount /proc");
 
-	ret = mount("none", "/proc", "proc", 0, NULL);
+	ret = mount_filesystem("proc", "/proc", 0);
 	if (ret < 0)
 		return log_error_errno(-1, errno, "Failed to remount /proc");
 
@@ -215,7 +216,7 @@ int lxc_attach_remount_sys_proc(void)
 		return log_error_errno(-1, errno, "Failed to unmount /sys");
 
 	/* Remount it. */
-	if (ret == 0 && mount("none", "/sys", "sysfs", 0, NULL))
+	if (ret == 0 && mount_filesystem("sysfs", "/sys", 0))
 		return log_error_errno(-1, errno, "Failed to remount /sys");
 
 	return 0;