RPC: make status-fd option available via RPC

As runc uses the RPC interface to run criu it is necessary to expose
the newly added status-fd feature via RPC. Using the status-fd interface
makes it possible to use lazy migration with runc.

travis-ci: success for RPC: make status-fd option available via RPC (rev3)
Signed-off-by: Adrian Reber <areber@redhat.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

criu/cr-service.c

@@ -227,6 +227,7 @@ static int setup_opts_from_req(int sk, CriuOpts *req)
 	socklen_t ids_len = sizeof(struct ucred);
 	char images_dir_path[PATH_MAX];
 	char work_dir_path[PATH_MAX];
+	char status_fd[PATH_MAX];
 	int i;
 
 	if (getsockopt(sk, SOL_SOCKET, SO_PEERCRED, &ids, &ids_len)) {
@@ -504,6 +505,13 @@ static int setup_opts_from_req(int sk, CriuOpts *req)
 		}
 	}
 
+	if (req->has_status_fd) {
+		sprintf(status_fd, "/proc/%d/fd/%d", ids.pid, req->status_fd);
+		opts.status_fd = open(status_fd, O_WRONLY);
+		if (opts.status_fd < 0)
+			goto err;
+	}
+
 	if (check_namespace_opts())
 		goto err;
 

images/rpc.proto

@@ -108,6 +108,7 @@ message criu_opts {
 	optional uint32			timeout			= 45;
 	optional bool			tcp_skip_in_flight	= 46;
 	optional bool			weak_sysctls		= 47;
+	optional int32			status_fd		= 49;
 }
 
 message criu_dump_resp {