[17/20] migration-test: Clean up string interpolation into QMP, part 1

Message ID 20180712111221.20326-18-armbru@redhat.com
State New
Headers show
Series
  • tests: Compile-time format string checking for libqtest.h
Related show

Commit Message

Markus Armbruster July 12, 2018, 11:12 a.m.
Leaving interpolation into JSON to qmp() is more robust than building
QMP input manually, as explained in the recent commit "tests: Clean up
string interpolation into QMP input (simple cases)".

migrate_recover() builds QMP input manually because wait_command()
can't interpolate.  Well, it can since the previous commit.  Simplify
accordingly.

Bonus: gets rid of a non-literal format string.  A step towards
compile-time format string checking without triggering
-Wformat-nonliteral.

Cc: Juan Quintela <quintela@redhat.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 tests/migration-test.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

Comments

Juan Quintela July 12, 2018, 11:25 a.m. | #1
Markus Armbruster <armbru@redhat.com> wrote:
> Leaving interpolation into JSON to qmp() is more robust than building
> QMP input manually, as explained in the recent commit "tests: Clean up
> string interpolation into QMP input (simple cases)".
>
> migrate_recover() builds QMP input manually because wait_command()
> can't interpolate.  Well, it can since the previous commit.  Simplify
> accordingly.
>
> Bonus: gets rid of a non-literal format string.  A step towards
> compile-time format string checking without triggering
> -Wformat-nonliteral.
>
> Cc: Juan Quintela <quintela@redhat.com>
> Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
> Signed-off-by: Markus Armbruster <armbru@redhat.com>

Reviewed-by: Juan Quintela <quintela@redhat.com>

Why, o why it needs to be so difficult!!!
Markus Armbruster July 16, 2018, 6:37 a.m. | #2
Juan Quintela <quintela@redhat.com> writes:

> Markus Armbruster <armbru@redhat.com> wrote:
>> Leaving interpolation into JSON to qmp() is more robust than building
>> QMP input manually, as explained in the recent commit "tests: Clean up
>> string interpolation into QMP input (simple cases)".
>>
>> migrate_recover() builds QMP input manually because wait_command()
>> can't interpolate.  Well, it can since the previous commit.  Simplify
>> accordingly.
>>
>> Bonus: gets rid of a non-literal format string.  A step towards
>> compile-time format string checking without triggering
>> -Wformat-nonliteral.
>>
>> Cc: Juan Quintela <quintela@redhat.com>
>> Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
>> Signed-off-by: Markus Armbruster <armbru@redhat.com>
>
> Reviewed-by: Juan Quintela <quintela@redhat.com>
>
> Why, o why it needs to be so difficult!!!

At least the series improves the interface from Rusty's API level -4
"Follow common convention and you'll get it wrong" to API level 4
"Follow common convention and you'll get it right", and for some kind of
mistakes even to API level 8 "The compiler will warn if you get it
wrong."

Thanks!

Patch

diff --git a/tests/migration-test.c b/tests/migration-test.c
index 55f9d006ec..66a4cd2395 100644
--- a/tests/migration-test.c
+++ b/tests/migration-test.c
@@ -355,13 +355,12 @@  static void migrate_pause(QTestState *who)
 static void migrate_recover(QTestState *who, const char *uri)
 {
     QDict *rsp;
-    gchar *cmd = g_strdup_printf(
-        "{ 'execute': 'migrate-recover', "
-        "  'id': 'recover-cmd', "
-        "  'arguments': { 'uri': '%s' } }", uri);
 
-    rsp = wait_command(who, cmd);
-    g_free(cmd);
+    rsp = wait_command(who,
+                       "{ 'execute': 'migrate-recover', "
+                       "  'id': 'recover-cmd', "
+                       "  'arguments': { 'uri': %s } }",
+                       uri);
     qobject_unref(rsp);
 }