[PATCH v2 17/22] qga: conditionalize schema for commands not supported on other UNIX

["Daniel P. Berrangé" <berrange@redhat.com>]

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 commands on other UNIX.

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.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 meson.build          | 1 +
 qga/commands-posix.c | 8 --------
 qga/qapi-schema.json | 3 ++-
 3 files changed, 3 insertions(+), 9 deletions(-)

diff --git a/meson.build b/meson.build
index d9f3349b0a..92b8c02582 100644
--- a/meson.build
+++ b/meson.build
@@ -2234,6 +2234,7 @@ config_host_data.set('CONFIG_ATTR', libattr.found())
 config_host_data.set('CONFIG_BDRV_WHITELIST_TOOLS', get_option('block_drv_whitelist_in_tools'))
 config_host_data.set('CONFIG_BRLAPI', brlapi.found())
 config_host_data.set('CONFIG_BSD', host_os in bsd_oses)
+config_host_data.set('CONFIG_FREEBSD', host_os == 'freebsd')
 config_host_data.set('CONFIG_CAPSTONE', capstone.found())
 config_host_data.set('CONFIG_COCOA', cocoa.found())
 config_host_data.set('CONFIG_DARWIN', host_os == 'darwin')
diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index a353f64ae6..f4104f2760 100644
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -877,14 +877,6 @@ void qmp_guest_set_user_password(const char *username,
         return;
     }
 }
-#else /* __linux__ || __FreeBSD__ */
-void qmp_guest_set_user_password(const char *username,
-                                 const char *password,
-                                 bool crypted,
-                                 Error **errp)
-{
-    error_setg(errp, QERR_UNSUPPORTED);
-}
 #endif /* __linux__ || __FreeBSD__ */
 
 #ifdef HAVE_GETIFADDRS
diff --git a/qga/qapi-schema.json b/qga/qapi-schema.json
index 70d4f173ad..571be3a914 100644
--- a/qga/qapi-schema.json
+++ b/qga/qapi-schema.json
@@ -1108,7 +1108,8 @@
 # Since: 2.3
 ##
 { 'command': 'guest-set-user-password',
-  'data': { 'username': 'str', 'password': 'str', 'crypted': 'bool' } }
+  'data': { 'username': 'str', 'password': 'str', 'crypted': 'bool' },
+  'if': { 'any': [ 'CONFIG_WIN32', 'CONFIG_LINUX', 'CONFIG_FREEBSD'] } }
 
 ##
 # @GuestMemoryBlock:
-- 
2.45.1