Rather than creating stubs for every command that just return
QERR_UNSUPPORTED, use 'if' conditions in the schema to fully
exclude generation of the filesystem trimming commands 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-linux.c | 8 --------
 qga/qapi-schema.json | 8 ++++----
 2 files changed, 4 insertions(+), 12 deletions(-)

diff --git a/qga/commands-linux.c b/qga/commands-linux.c
index 73b13fbaf6..89bdcded01 100644
--- a/qga/commands-linux.c
+++ b/qga/commands-linux.c
@@ -1049,14 +1049,6 @@ GuestDiskInfoList *qmp_guest_get_disks(Error **errp)
     return ret;
 }
 
-#else
-
-GuestDiskInfoList *qmp_guest_get_disks(Error **errp)
-{
-    error_setg(errp, QERR_UNSUPPORTED);
-    return NULL;
-}
-
 #endif
 
 /* Return a list of the disk device(s)' info which @mount lies on */
diff --git a/qga/qapi-schema.json b/qga/qapi-schema.json
index 21c65d1806..cf1ad42519 100644
--- a/qga/qapi-schema.json
+++ b/qga/qapi-schema.json
@@ -986,7 +986,7 @@
            'media-errors-hi': 'uint64',
            'number-of-error-log-entries-lo': 'uint64',
            'number-of-error-log-entries-hi': 'uint64' },
-  'if': { 'any': [ 'CONFIG_WIN32', 'CONFIG_LINUX' ] } }
+  'if': { 'any': [ 'CONFIG_WIN32', 'CONFIG_LIBUDEV' ] } }
 
 ##
 # @GuestDiskSmart:
@@ -1001,7 +1001,7 @@
   'base': { 'type': 'GuestDiskBusType' },
   'discriminator': 'type',
   'data': { 'nvme': 'GuestNVMeSmart' },
-  'if': { 'any': [ 'CONFIG_WIN32', 'CONFIG_LINUX' ] } }
+  'if': { 'any': [ 'CONFIG_WIN32', 'CONFIG_LIBUDEV' ] } }
 
 ##
 # @GuestDiskInfo:
@@ -1027,7 +1027,7 @@
   'data': {'name': 'str', 'partition': 'bool', '*dependencies': ['str'],
            '*address': 'GuestDiskAddress', '*alias': 'str',
            '*smart': 'GuestDiskSmart'},
-  'if': { 'any': [ 'CONFIG_WIN32', 'CONFIG_LINUX' ] } }
+  'if': { 'any': [ 'CONFIG_WIN32', 'CONFIG_LIBUDEV' ] } }
 
 ##
 # @guest-get-disks:
@@ -1041,7 +1041,7 @@
 ##
 { 'command': 'guest-get-disks',
   'returns': ['GuestDiskInfo'],
-  'if': { 'any': [ 'CONFIG_WIN32', 'CONFIG_LINUX' ] } }
+  'if': { 'any': [ 'CONFIG_WIN32', 'CONFIG_LIBUDEV' ] } }
 
 ##
 # @GuestFilesystemInfo:
-- 
2.45.1