pycriu: making images_dir_fd optional

Since `images_dir_fd` is a required filed in `rpc.proto` we must
manually set it to `-1` in order to use `images_dir`.

Fix this by explicitly assigning `images_dir_fd` the value from `opts`
so it happens automatically.

Signed-off-by: Andrii Herheliuk <[email protected]>

Author: herheliuk

lib/pycriu/criu.py

@@ -278,6 +278,7 @@ def dump(self):
         req = rpc.criu_req()
         req.type = rpc.DUMP
         req.opts.MergeFrom(self.opts)
+        req.opts.images_dir_fd = self.opts.images_dir_fd
 
         resp = self._send_req_and_recv_resp(req)
 
@@ -293,6 +294,7 @@ def pre_dump(self):
         req = rpc.criu_req()
         req.type = rpc.PRE_DUMP
         req.opts.MergeFrom(self.opts)
+        req.opts.images_dir_fd = self.opts.images_dir_fd
 
         resp = self._send_req_and_recv_resp(req)
 
@@ -308,6 +310,7 @@ def restore(self):
         req = rpc.criu_req()
         req.type = rpc.RESTORE
         req.opts.MergeFrom(self.opts)
+        req.opts.images_dir_fd = self.opts.images_dir_fd
 
         resp = self._send_req_and_recv_resp(req)
 
@@ -320,6 +323,7 @@ def page_server_chld(self):
         req = rpc.criu_req()
         req.type = rpc.PAGE_SERVER_CHLD
         req.opts.MergeFrom(self.opts)
+        req.opts.images_dir_fd = self.opts.images_dir_fd
         req.keep_open = True
 
         resp = self._send_req_and_recv_resp(req)