From d2032598c434fe385145ee6ea58007a19ef7e723 Mon Sep 17 00:00:00 2001 From: Markus Armbruster Date: Thu, 18 Mar 2021 16:55:17 +0100 Subject: [PATCH] qapi: Implement deprecated-input=reject for QMP commands This policy rejects deprecated input, and thus permits "testing the future". Implement it for QMP commands: make deprecated ones fail. Example: when QEMU is run with -compat deprecated-input=reject, then {"execute": "query-cpus"} fails like this {"error": {"class": "CommandNotFound", "desc": "Deprecated command query-cpus disabled by policy"}} When the deprecated command is removed, the error will change to {"error": {"class": "CommandNotFound", "desc": "The command query-cpus has not been found"}} Signed-off-by: Markus Armbruster Reviewed-by: Eric Blake Message-Id: <20210318155519.1224118-10-armbru@redhat.com> --- include/qapi/qmp/dispatch.h | 1 + qapi/qmp-dispatch.c | 13 +++++++++++++ scripts/qapi/commands.py | 10 +++++++--- tests/unit/test-qmp-cmds.c | 24 ++++++++++++++++++++++++ 4 files changed, 45 insertions(+), 3 deletions(-) diff --git a/include/qapi/qmp/dispatch.h b/include/qapi/qmp/dispatch.h index 135dfdef71..075203dc67 100644 --- a/include/qapi/qmp/dispatch.h +++ b/include/qapi/qmp/dispatch.h @@ -26,6 +26,7 @@ typedef enum QmpCommandOptions QCO_ALLOW_OOB = (1U << 1), QCO_ALLOW_PRECONFIG = (1U << 2), QCO_COROUTINE = (1U << 3), + QCO_DEPRECATED = (1U << 4), } QmpCommandOptions; typedef struct QmpCommand diff --git a/qapi/qmp-dispatch.c b/qapi/qmp-dispatch.c index f79db89b60..bcb790d876 100644 --- a/qapi/qmp-dispatch.c +++ b/qapi/qmp-dispatch.c @@ -167,6 +167,19 @@ QDict *qmp_dispatch(const QmpCommandList *cmds, QObject *request, "The command %s has not been found", command); goto out; } + if (cmd->options & QCO_DEPRECATED) { + switch (compat_policy.deprecated_input) { + case COMPAT_POLICY_INPUT_ACCEPT: + break; + case COMPAT_POLICY_INPUT_REJECT: + error_set(&err, ERROR_CLASS_COMMAND_NOT_FOUND, + "Deprecated command %s disabled by policy", + command); + goto out; + default: + abort(); + } + } if (!cmd->enabled) { error_set(&err, ERROR_CLASS_COMMAND_NOT_FOUND, "Command %s has been disabled%s%s", diff --git a/scripts/qapi/commands.py b/scripts/qapi/commands.py index b7e577a5d1..c4628517ee 100644 --- a/scripts/qapi/commands.py +++ b/scripts/qapi/commands.py @@ -210,12 +210,16 @@ out: def gen_register_command(name: str, + features: List[QAPISchemaFeature], success_response: bool, allow_oob: bool, allow_preconfig: bool, coroutine: bool) -> str: options = [] + if 'deprecated' in [f.name for f in features]: + options += ['QCO_DEPRECATED'] + if not success_response: options += ['QCO_NO_SUCCESS_RESP'] if allow_oob: @@ -326,9 +330,9 @@ void %(c_prefix)sqmp_init_marshal(QmpCommandList *cmds) self._genc.add(gen_marshal(name, arg_type, boxed, ret_type)) with self._temp_module('./init'): with ifcontext(ifcond, self._genh, self._genc): - self._genc.add(gen_register_command(name, success_response, - allow_oob, allow_preconfig, - coroutine)) + self._genc.add(gen_register_command( + name, features, success_response, allow_oob, + allow_preconfig, coroutine)) def gen_commands(schema: QAPISchema, diff --git a/tests/unit/test-qmp-cmds.c b/tests/unit/test-qmp-cmds.c index 1079d35122..cba982154b 100644 --- a/tests/unit/test-qmp-cmds.c +++ b/tests/unit/test-qmp-cmds.c @@ -281,6 +281,28 @@ static void test_dispatch_cmd_io(void) qobject_unref(ret3); } +static void test_dispatch_cmd_deprecated(void) +{ + const char *cmd = "{ 'execute': 'test-command-features1' }"; + QDict *ret; + + memset(&compat_policy, 0, sizeof(compat_policy)); + + /* accept */ + ret = qobject_to(QDict, do_qmp_dispatch(false, cmd)); + assert(ret && qdict_size(ret) == 0); + qobject_unref(ret); + + compat_policy.has_deprecated_input = true; + compat_policy.deprecated_input = COMPAT_POLICY_INPUT_ACCEPT; + ret = qobject_to(QDict, do_qmp_dispatch(false, cmd)); + assert(ret && qdict_size(ret) == 0); + qobject_unref(ret); + + compat_policy.deprecated_input = COMPAT_POLICY_INPUT_REJECT; + do_qmp_dispatch_error(false, ERROR_CLASS_COMMAND_NOT_FOUND, cmd); +} + static void test_dispatch_cmd_ret_deprecated(void) { const char *cmd = "{ 'execute': 'test-features0' }"; @@ -379,6 +401,8 @@ int main(int argc, char **argv) g_test_add_func("/qmp/dispatch_cmd_io", test_dispatch_cmd_io); g_test_add_func("/qmp/dispatch_cmd_success_response", test_dispatch_cmd_success_response); + g_test_add_func("/qmp/dispatch_cmd_deprecated", + test_dispatch_cmd_deprecated); g_test_add_func("/qmp/dispatch_cmd_ret_deprecated", test_dispatch_cmd_ret_deprecated); g_test_add_func("/qmp/dealloc_types", test_dealloc_types); -- 2.11.4.GIT