qga: conditionalize schema for commands requiring getifaddrs

Rather than creating stubs for every comamnd that just return
QERR_UNSUPPORTED, use 'if' conditions in the QAPI schema to
fully exclude generation of the network interface command on
POSIX platforms lacking getifaddrs().

The command will be rejected at QMP dispatch time instead,
avoiding reimplementing rejection by blocking the stub commands.
This changes the error message for affected commands from

   {"class": "CommandNotFound", "desc": "Command FOO has been disabled"}

to

    {"class": "CommandNotFound", "desc": "The command FOO has not been found"}

This has the additional benefit that the QGA protocol reference
now documents what conditions enable use of the command.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Konstantin Kostiuk <kkostiuk@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Message-ID: <20240712132459.3974109-11-berrange@redhat.com>
Signed-off-by: Konstantin Kostiuk <kkostiuk@redhat.com>

diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index 559d71ffae15121e7b82ffde17dda385c383864b..09d08ee2ca459969c76555bb940fc1953a3d8e6c 100644 (file)
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -1142,14 +1142,6 @@ error:
     return NULL;
 }
 
-#else
-
-GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp)
-{
-    error_setg(errp, QERR_UNSUPPORTED);
-    return NULL;
-}
-
 #endif /* HAVE_GETIFADDRS */
 
 #if !defined(CONFIG_FSFREEZE)
@@ -1222,11 +1214,6 @@ qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp)
 /* add unsupported commands to the list of blocked RPCs */
 GList *ga_command_init_blockedrpcs(GList *blockedrpcs)
 {
-#if !defined(HAVE_GETIFADDRS)
-    blockedrpcs = g_list_append(blockedrpcs,
-                              g_strdup("guest-network-get-interfaces"));
-#endif
-
 #if !defined(CONFIG_FSFREEZE)
     {
         const char *list[] = {

diff --git a/qga/qapi-schema.json b/qga/qapi-schema.json
index 38483652ac6bc3ad76fdf5f66aae47b2032d6188..79ed4f0e217be1a12c9c573b7785c09030d161e4 100644 (file)
--- a/qga/qapi-schema.json
+++ b/qga/qapi-schema.json
@@ -654,7 +654,8 @@
 # Since: 1.1
 ##
 { 'enum': 'GuestIpAddressType',
-  'data': [ 'ipv4', 'ipv6' ] }
+  'data': [ 'ipv4', 'ipv6' ],
+  'if': { 'any': ['CONFIG_WIN32', 'HAVE_GETIFADDRS'] } }
 
 ##
 # @GuestIpAddress:
@@ -670,7 +671,8 @@
 { 'struct': 'GuestIpAddress',
   'data': {'ip-address': 'str',
            'ip-address-type': 'GuestIpAddressType',
-           'prefix': 'int'} }
+           'prefix': 'int'},
+  'if': { 'any': ['CONFIG_WIN32', 'HAVE_GETIFADDRS'] } }
 
 ##
 # @GuestNetworkInterfaceStat:
@@ -702,7 +704,8 @@
             'tx-packets': 'uint64',
             'tx-errs': 'uint64',
             'tx-dropped': 'uint64'
-           } }
+           },
+  'if': { 'any': ['CONFIG_WIN32', 'HAVE_GETIFADDRS'] } }
 
 ##
 # @GuestNetworkInterface:
@@ -722,7 +725,8 @@
   'data': {'name': 'str',
            '*hardware-address': 'str',
            '*ip-addresses': ['GuestIpAddress'],
-           '*statistics': 'GuestNetworkInterfaceStat' } }
+           '*statistics': 'GuestNetworkInterfaceStat' },
+  'if': { 'any': ['CONFIG_WIN32', 'HAVE_GETIFADDRS'] } }
 
 ##
 # @guest-network-get-interfaces:
@@ -734,7 +738,8 @@
 # Since: 1.1
 ##
 { 'command': 'guest-network-get-interfaces',
-  'returns': ['GuestNetworkInterface'] }
+  'returns': ['GuestNetworkInterface'],
+  'if': { 'any': ['CONFIG_WIN32', 'HAVE_GETIFADDRS'] } }
 
 ##
 # @GuestLogicalProcessor: