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[PULL 26/31] hmp: remove "change vnc TARGET" command

From: Paolo Bonzini
Subject: [PULL 26/31] hmp: remove "change vnc TARGET" command
Date: Sat, 23 Jan 2021 09:31:23 -0500

The HMP command \"change vnc TARGET\" is messy:

- it takes an ugly shortcut to determine if the option has an "id",
with incorrect results if "id=" is not preceded by an unescaped

- it deletes the existing QemuOpts and does not try to rollback
if the parsing fails (which is not causing problems, but only due to
how VNC options are parsed)

- because it uses the same parsing function as "-vnc", it forces
the latter to not support "-vnc help".

On top of this, it uses a deprecated QMP command, thus getting in
the way of removing the QMP command.  Since the usecase for the
command is not clear, just remove it and send "change vnc password"
directly to the QMP "change-vnc-password" command.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Message-Id: <20210120144235.345983-2-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
 docs/system/removed-features.rst | 6 ++++++
 hmp-commands.hx                  | 6 ------
 monitor/hmp-cmds.c               | 7 +++++--
 3 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/docs/system/removed-features.rst b/docs/system/removed-features.rst
index 430fc33ca1..5b0ff6ab1f 100644
--- a/docs/system/removed-features.rst
+++ b/docs/system/removed-features.rst
@@ -68,6 +68,12 @@ The ``[hub_id name]`` parameter tuple of the 'hostfwd_add' 
 Use ``device_add`` for hotplugging vCPUs instead of ``cpu-add``.  See
 documentation of ``query-hotpluggable-cpus`` for additional details.
+``change vnc TARGET`` (removed in 6.0)
+No replacement.  The ``change vnc password`` and ``change DEVICE MEDIUM``
+commands are not affected.
 Guest Emulator ISAs
diff --git a/hmp-commands.hx b/hmp-commands.hx
index 73e0832ea1..d4001f9c5d 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -231,12 +231,6 @@ SRST
       Makes the device writable.
-  ``change vnc`` *display*,\ *options*
-    Change the configuration of the VNC server. The valid syntax for *display*
-    and *options* are described at :ref:`sec_005finvocation`. eg::
-      (qemu) change vnc localhost:1
   ``change vnc password`` [*password*]
     Change the password associated with the VNC server. If the new password
diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c
index fd4d77e246..499647a578 100644
--- a/monitor/hmp-cmds.c
+++ b/monitor/hmp-cmds.c
@@ -1521,13 +1521,16 @@ void hmp_change(Monitor *mon, const QDict *qdict)
         if (strcmp(target, "passwd") == 0 ||
             strcmp(target, "password") == 0) {
-            if (!arg) {
+            if (arg) {
                 MonitorHMP *hmp_mon = container_of(mon, MonitorHMP, common);
                 monitor_read_password(hmp_mon, hmp_change_read_arg, NULL);
+            } else {
+                qmp_change_vnc_password(arg, &err);
+        } else {
+            monitor_printf(mon, "Expected 'password' after 'vnc'\n");
-        qmp_change("vnc", target, !!arg, arg, &err);
     } else

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