spice: add option for disabling copy paste support

Some people want to be able disable spice's guest <-> client copy paste support
because of security considerations.

[ kraxel: drop old-version error message ]

qemu-config.c

@@ -384,6 +384,9 @@ QemuOptsList qemu_spice_opts = {
         },{
             .name = "disable-ticketing",
             .type = QEMU_OPT_BOOL,
+        },{
+            .name = "disable-copy-paste",
+            .type = QEMU_OPT_BOOL,
         },{
             .name = "x509-dir",
             .type = QEMU_OPT_STRING,

qemu-options.hx

@@ -717,6 +717,9 @@ Set the password you need to authenticate.
 @item disable-ticketing
 Allow client connects without authentication.
 
+@item disable-copy-paste
+Disable copy paste between the client and the guest.
+
 @item tls-port=<nr>
 Set the TCP port spice is listening on for encrypted channels.
 

ui/spice-core.c

@@ -554,6 +554,12 @@ void qemu_spice_init(void)
         spice_server_set_noauth(spice_server);
     }
 
+#if SPICE_SERVER_VERSION >= 0x000801
+    if (qemu_opt_get_bool(opts, "disable-copy-paste", 0)) {
+        spice_server_set_agent_copypaste(spice_server, false);
+    }
+#endif
+
     compression = SPICE_IMAGE_COMPRESS_AUTO_GLZ;
     str = qemu_opt_get(opts, "image-compression");
     if (str) {