[libvirt] [PATCH] util: Use virStorageSourceNew in virStorageFileMetadataNew

[John Ferlan]

On 2/18/19 7:51 AM, Peter Krempa wrote:
> On Mon, Feb 18, 2019 at 07:38:34 -0500, John Ferlan wrote:
>>
>>
>> On 2/18/19 7:27 AM, Peter Krempa wrote:
>>> Commit dcda2bf4c110 forgot to fix this one instance.
>>>
>>> Signed-off-by: Peter Krempa <pkrempa at redhat.com>
>>> ---
>>>  src/util/virstoragefile.c | 14 ++++++--------
>>>  1 file changed, 6 insertions(+), 8 deletions(-)
>>>
>>
>> Right fix as far as I'm concerned; however, I am curious to know whether
>> this passes the MinGW build test because this is exactly where things
>> started to break down for VIR_AUTOPTR usage.
> 
> We'll see after I push it. I don't have mingw deployed and don't care
> enough about that platform to do so.
> 

Cannot disagree about the relevance of the importance of MinGW. Still I
note it because it was something that caused previous changes to add
VIR_AUTOPTR for this module to not be pushed. I was pointed in the
direction of Andrea and the lcitool, but TBH that didn't help me much.
Eventually I noted that Erik had run a build via some link between
travis-ci.org and a github repo. I was able to do something similar and
found a similar failure.

>>
>> VIR_AUTOUNREF could also be used more liberally in this module...
> 
> I'll not pursue this refactor.
> 
>>
>>> diff --git a/src/util/virstoragefile.c b/src/util/virstoragefile.c
>>> index 5927140a66..b2e308d81d 100644
>>> --- a/src/util/virstoragefile.c
>>> +++ b/src/util/virstoragefile.c
>>> @@ -1119,22 +1119,20 @@ static virStorageSourcePtr
>>>  virStorageFileMetadataNew(const char *path,
>>>                            int format)
>>>  {
>>> -    virStorageSourcePtr def = NULL;
>>> +    VIR_AUTOUNREF(virStorageSourcePtr) def = NULL;
>>> +    virStorageSourcePtr ret = NULL;
>>
>> Erik prefers the usage of VIR_AUTO* defs last (IOW, swap these).
> 
> Well I prefer if the returned variable is last and if the longer lines
> are first.
> 

Picking and choosing which review comments to follow is an interesting
decision - hopefully it's not contagious.

Consistency wise, VIR_AUTO* defs have been last. If it's that important
I suppose per usual someone can come in afterwards and propose another
patch as well as either a rule in/for make check or adjustment to the
hacking guide.

John

>> As long as this gets through the MinGW build test, then
>>
>> Reviewed-by: John Ferlan <jferlan at redhat.com>
>>
>> John
>>
>> Altering other virStorageSource refs here to use VIR_AUTOUNREF would be
>> the next step (and of course getting them through MinGW build test).
>>
>>>
>>> -    if (VIR_ALLOC(def) < 0)
>>> +    if (!(def = virStorageSourceNew()))
>>>          return NULL;
>>>
>>>      def->format = format;
>>>      def->type = VIR_STORAGE_TYPE_FILE;
>>>
>>>      if (VIR_STRDUP(def->path, path) < 0)
>>> -        goto error;
>>> -
>>> -    return def;
>>> +        return NULL;
>>>
>>> - error:
>>> -    virObjectUnref(def);
>>> -    return NULL;
>>> +    VIR_STEAL_PTR(ret, def);
>>> +    return ret;
>>>  }
>>>
>>>