[PATCH] qapi: Improve input_type_enum()'s error message

[Markus Armbruster <armbru@redhat.com>]

The error message claims the parameter is invalid:

    $ qemu-system-x86_64 -object qom-type=nonexistent
    qemu-system-x86_64: -object qom-type=nonexistent: Invalid parameter 'nonexistent'

What's wrong is actually the *value* 'nonexistent'.  Improve the
message to

    qemu-system-x86_64: -object qom-type=nonexistent: Parameter 'qom-type' does not accept value 'nonexistent'

Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 qapi/qapi-visit-core.c          | 3 ++-
 tests/unit/check-qom-proplist.c | 2 +-
 tests/qemu-iotests/049.out      | 6 +++---
 tests/qemu-iotests/206.out      | 2 +-
 tests/qemu-iotests/237.out      | 6 +++---
 tests/qemu-iotests/245          | 2 +-
 6 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/qapi/qapi-visit-core.c b/qapi/qapi-visit-core.c
index a641adec51..7310f0a0ca 100644
--- a/qapi/qapi-visit-core.c
+++ b/qapi/qapi-visit-core.c
@@ -392,7 +392,8 @@ static bool input_type_enum(Visitor *v, const char *name, int *obj,
 
     value = qapi_enum_parse(lookup, enum_str, -1, NULL);
     if (value < 0) {
-        error_setg(errp, QERR_INVALID_PARAMETER, enum_str);
+        error_setg(errp, "Parameter '%s' does not accept value '%s'",
+                   name ? name : "null", enum_str);
         g_free(enum_str);
         return false;
     }
diff --git a/tests/unit/check-qom-proplist.c b/tests/unit/check-qom-proplist.c
index 48503e0dff..ed341088d3 100644
--- a/tests/unit/check-qom-proplist.c
+++ b/tests/unit/check-qom-proplist.c
@@ -488,7 +488,7 @@ static void test_dummy_badenum(void)
     g_assert(dobj == NULL);
     g_assert(err != NULL);
     g_assert_cmpstr(error_get_pretty(err), ==,
-                    "Invalid parameter 'yeti'");
+                    "Parameter 'av' does not accept value 'yeti'");
 
     g_assert(object_resolve_path_component(parent, "dummy0")
              == NULL);
diff --git a/tests/qemu-iotests/049.out b/tests/qemu-iotests/049.out
index 01f7b1f240..8719c91b48 100644
--- a/tests/qemu-iotests/049.out
+++ b/tests/qemu-iotests/049.out
@@ -174,11 +174,11 @@ Formatting 'TEST_DIR/t.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off comp
 
 qemu-img create -f qcow2 -o compat=0.42 TEST_DIR/t.qcow2 64M
 Formatting 'TEST_DIR/t.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off compression_type=zlib size=67108864 compat=0.42 lazy_refcounts=off refcount_bits=16
-qemu-img: TEST_DIR/t.qcow2: Invalid parameter '0.42'
+qemu-img: TEST_DIR/t.qcow2: Parameter 'version' does not accept value '0.42'
 
 qemu-img create -f qcow2 -o compat=foobar TEST_DIR/t.qcow2 64M
 Formatting 'TEST_DIR/t.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off compression_type=zlib size=67108864 compat=foobar lazy_refcounts=off refcount_bits=16
-qemu-img: TEST_DIR/t.qcow2: Invalid parameter 'foobar'
+qemu-img: TEST_DIR/t.qcow2: Parameter 'version' does not accept value 'foobar'
 
 == Check preallocation option ==
 
@@ -190,7 +190,7 @@ Formatting 'TEST_DIR/t.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off prea
 
 qemu-img create -f qcow2 -o preallocation=1234 TEST_DIR/t.qcow2 64M
 Formatting 'TEST_DIR/t.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off preallocation=1234 compression_type=zlib size=67108864 lazy_refcounts=off refcount_bits=16
-qemu-img: TEST_DIR/t.qcow2: Invalid parameter '1234'
+qemu-img: TEST_DIR/t.qcow2: Parameter 'preallocation' does not accept value '1234'
 
 == Check encryption option ==
 
diff --git a/tests/qemu-iotests/206.out b/tests/qemu-iotests/206.out
index b68c443867..3593e8e9c2 100644
--- a/tests/qemu-iotests/206.out
+++ b/tests/qemu-iotests/206.out
@@ -192,7 +192,7 @@ Job failed: Could not resize image: Failed to grow the L1 table: File too large
 
 === Invalid version ===
 {"execute": "blockdev-create", "arguments": {"job-id": "job0", "options": {"driver": "qcow2", "file": "node0", "size": 67108864, "version": "v1"}}}
-{"error": {"class": "GenericError", "desc": "Invalid parameter 'v1'"}}
+{"error": {"class": "GenericError", "desc": "Parameter 'version' does not accept value 'v1'"}}
 
 {"execute": "blockdev-create", "arguments": {"job-id": "job0", "options": {"driver": "qcow2", "file": "node0", "lazy-refcounts": true, "size": 67108864, "version": "v2"}}}
 {"return": {}}
diff --git a/tests/qemu-iotests/237.out b/tests/qemu-iotests/237.out
index aa94986803..2f09ff5512 100644
--- a/tests/qemu-iotests/237.out
+++ b/tests/qemu-iotests/237.out
@@ -116,13 +116,13 @@ Job failed: Cannot find device='this doesn't exist' nor node-name='this doesn't
 == Invalid adapter types ==
 
 {"execute": "blockdev-create", "arguments": {"job-id": "job0", "options": {"adapter-type": "foo", "driver": "vmdk", "file": "node0", "size": 33554432}}}
-{"error": {"class": "GenericError", "desc": "Invalid parameter 'foo'"}}
+{"error": {"class": "GenericError", "desc": "Parameter 'adapter-type' does not accept value 'foo'"}}
 
 {"execute": "blockdev-create", "arguments": {"job-id": "job0", "options": {"adapter-type": "IDE", "driver": "vmdk", "file": "node0", "size": 33554432}}}
-{"error": {"class": "GenericError", "desc": "Invalid parameter 'IDE'"}}
+{"error": {"class": "GenericError", "desc": "Parameter 'adapter-type' does not accept value 'IDE'"}}
 
 {"execute": "blockdev-create", "arguments": {"job-id": "job0", "options": {"adapter-type": "legacyesx", "driver": "vmdk", "file": "node0", "size": 33554432}}}
-{"error": {"class": "GenericError", "desc": "Invalid parameter 'legacyesx'"}}
+{"error": {"class": "GenericError", "desc": "Parameter 'adapter-type' does not accept value 'legacyesx'"}}
 
 {"execute": "blockdev-create", "arguments": {"job-id": "job0", "options": {"adapter-type": 1, "driver": "vmdk", "file": "node0", "size": 33554432}}}
 {"error": {"class": "GenericError", "desc": "Invalid parameter type for 'options.adapter-type', expected: string"}}
diff --git a/tests/qemu-iotests/245 b/tests/qemu-iotests/245
index bf8261eec0..1898807f25 100755
--- a/tests/qemu-iotests/245
+++ b/tests/qemu-iotests/245
@@ -149,7 +149,7 @@ class TestBlockdevReopen(iotests.QMPTestCase):
         self.reopen(opts, {'node-name': ''}, "Failed to find node with node-name=''")
         self.reopen(opts, {'node-name': None}, "Invalid parameter type for 'options[0].node-name', expected: string")
         self.reopen(opts, {'driver': 'raw'}, "Cannot change the option 'driver'")
-        self.reopen(opts, {'driver': ''}, "Invalid parameter ''")
+        self.reopen(opts, {'driver': ''}, "Parameter 'driver' does not accept value ''")
         self.reopen(opts, {'driver': None}, "Invalid parameter type for 'options[0].driver', expected: string")
         self.reopen(opts, {'file': 'not-found'}, "Cannot find device='' nor node-name='not-found'")
         self.reopen(opts, {'file': ''}, "Cannot find device='' nor node-name=''")
-- 
2.31.1