commit 9b090d42aea9a0abbf39a1d75561a186057b5fe6
author Markus Armbruster <armbru@redhat.com> Fri Jul 31 17:59:38 2015 +0200
committer Markus Armbruster <armbru@redhat.com> Fri Sep 04 15:47:15 2015 +0200
tree 9fa2bdfb3d85525635e51d60110bdbeee8419bc6
parent 315932b5edb86597adafbd1faa2d29c46499d8c3

qapi: Command returning anonymous type doesn't work, outlaw

Reproducer: with

    { 'command': 'user_def_cmd4', 'returns': { 'a': 'int' } }

added to qapi-schema-test.json, qapi-commands.py dies when it tries to
generate the command handler function

    Traceback (most recent call last):
      File "/work/armbru/qemu/scripts/qapi-commands.py", line 359, in <module>
        ret = generate_command_decl(cmd['command'], arglist, ret_type) + "\n"
      File "/work/armbru/qemu/scripts/qapi-commands.py", line 29, in generate_command_decl
        ret_type=c_type(ret_type), name=c_name(name),
      File "/work/armbru/qemu/scripts/qapi.py", line 927, in c_type
        assert isinstance(value, str) and value != ""
    AssertionError

because the return type doesn't exist.

Simply outlaw this usage, and drop or dumb down test cases accordingly.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>