[PATCH 1/2] tests/qtest: Introduce qtest_init_with_env_and_capabilities()

[Juraj Marcin]

This patch adds a new version of qtest_init_with_env() that allows
specifying QMP capabilities that should be enabled during handshake.
This is useful for example if a test needs out-of-band execution of QMP
commands, it can initialize with the oob capability.

Signed-off-by: Juraj Marcin <jmar...@redhat.com>
---
 tests/qtest/libqtest.c | 18 ++++++++++++++++--
 tests/qtest/libqtest.h | 17 +++++++++++++++++
 2 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/tests/qtest/libqtest.c b/tests/qtest/libqtest.c
index 8de5f1fde3..00dc01a851 100644
--- a/tests/qtest/libqtest.c
+++ b/tests/qtest/libqtest.c
@@ -543,7 +543,9 @@ QTestState *qtest_init_without_qmp_handshake(const char 
*extra_args)
     return qtest_init_internal(qtest_qemu_binary(NULL), extra_args);
 }
 
-QTestState *qtest_init_with_env(const char *var, const char *extra_args)
+QTestState *qtest_init_with_env_and_capabilities(const char *var,
+                                                 const char *extra_args,
+                                                 QList *capabilities)
 {
     QTestState *s = qtest_init_internal(qtest_qemu_binary(var), extra_args);
     QDict *greeting;
@@ -551,11 +553,23 @@ QTestState *qtest_init_with_env(const char *var, const 
char *extra_args)
     /* Read the QMP greeting and then do the handshake */
     greeting = qtest_qmp_receive(s);
     qobject_unref(greeting);
-    qobject_unref(qtest_qmp(s, "{ 'execute': 'qmp_capabilities' }"));
+    if (capabilities) {
+        qtest_qmp_assert_success(s,
+                                 "{ 'execute': 'qmp_capabilities', "
+                                 "'arguments': { 'enable': %p } }",
+                                 qobject_ref(capabilities));
+    } else {
+        qtest_qmp_assert_success(s, "{ 'execute': 'qmp_capabilities' }");
+    }
 
     return s;
 }
 
+QTestState *qtest_init_with_env(const char *var, const char *extra_args)
+{
+    return qtest_init_with_env_and_capabilities(var, extra_args, NULL);
+}
+
 QTestState *qtest_init(const char *extra_args)
 {
     return qtest_init_with_env(NULL, extra_args);
diff --git a/tests/qtest/libqtest.h b/tests/qtest/libqtest.h
index f23d80e9e5..1d0d5e7c29 100644
--- a/tests/qtest/libqtest.h
+++ b/tests/qtest/libqtest.h
@@ -19,6 +19,7 @@
 
 #include "qapi/qmp/qobject.h"
 #include "qapi/qmp/qdict.h"
+#include "qapi/qmp/qlist.h"
 #include "libqmp.h"
 
 typedef struct QTestState QTestState;
@@ -68,6 +69,22 @@ QTestState *qtest_init(const char *extra_args);
  */
 QTestState *qtest_init_with_env(const char *var, const char *extra_args);
 
+/**
+ * qtest_init_with_env_and_capabilities:
+ * @var: Environment variable from where to take the QEMU binary
+ * @extra_args: Other arguments to pass to QEMU.  CAUTION: these
+ * arguments are subject to word splitting and shell evaluation.
+ * @capabilities: list of QMP capabilities (strings) to enable
+ *
+ * Like qtest_init_with_env(), but enable specified capabilities during
+ * hadshake.
+ *
+ * Returns: #QTestState instance.
+ */
+QTestState *qtest_init_with_env_and_capabilities(const char *var,
+                                                 const char *extra_args,
+                                                 QList *capabilities);
+
 /**
  * qtest_init_without_qmp_handshake:
  * @extra_args: other arguments to pass to QEMU.  CAUTION: these
-- 
2.47.1