Rather than creating stubs for every command that just return
QERR_UNSUPPORTED, use 'if' conditions in the QAPI schema to
fully exclude generation of the get-users command on POSIX
platforms lacking required APIs.

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>
---
 qga/commands-posix.c | 10 +---------
 qga/qapi-schema.json |  6 ++++--
 2 files changed, 5 insertions(+), 11 deletions(-)

diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index d92fa0ec87..a353f64ae6 100644
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -1212,15 +1212,7 @@ GuestUserList *qmp_guest_get_users(Error **errp)
     return head;
 }
 
-#else
-
-GuestUserList *qmp_guest_get_users(Error **errp)
-{
-    error_setg(errp, QERR_UNSUPPORTED);
-    return NULL;
-}
-
-#endif
+#endif /* HAVE_UTMPX */
 
 /* Replace escaped special characters with their real values. The replacement
  * is done in place -- returned value is in the original string.
diff --git a/qga/qapi-schema.json b/qga/qapi-schema.json
index cf1ad42519..0662a68c43 100644
--- a/qga/qapi-schema.json
+++ b/qga/qapi-schema.json
@@ -1414,7 +1414,8 @@
 # Since: 2.10
 ##
 { 'struct': 'GuestUser',
-  'data': { 'user': 'str', 'login-time': 'number', '*domain': 'str' } }
+  'data': { 'user': 'str', 'login-time': 'number', '*domain': 'str' },
+  'if': { 'any': ['CONFIG_WIN32', 'HAVE_UTMPX' ] } }
 
 ##
 # @guest-get-users:
@@ -1426,7 +1427,8 @@
 # Since: 2.10
 ##
 { 'command': 'guest-get-users',
-  'returns': ['GuestUser'] }
+  'returns': ['GuestUser'],
+  'if': { 'any': ['CONFIG_WIN32', 'HAVE_UTMPX' ] } }
 
 ##
 # @GuestTimezone:
-- 
2.45.1