Re: [PATCH v4 5/8] status: print per-file porcelain v2 status data

[Jeff Hostetler <git@jeffhostetler.com>]

On 08/05/2016 05:02 PM, Jeff King wrote:
> On Tue, Aug 02, 2016 at 10:12:14AM -0400, Jeff Hostetler wrote:
>
>> +static void wt_porcelain_v2_print_unmerged_entry(
>> +	struct string_list_item *it,
>> +	struct wt_status *s)
>> +{
>> +	struct wt_status_change_data *d = it->util;
>> +	const struct cache_entry *ce;
>> +	struct strbuf buf_current = STRBUF_INIT;
>> +	const char *path_current = NULL;
>> +	int pos, stage, sum;
>> +	struct {
>> +		int mode;
>> +		struct object_id oid;
>> +	} stages[3];
>> +	char *key;
>> [...]
>> +	switch (d->stagemask) {
>> +	case 1: key = "DD"; break; /* both deleted */
>> +	case 2: key = "AU"; break; /* added by us */
>> +	case 3: key = "UD"; break; /* deleted by them */
>> +	case 4: key = "UA"; break; /* added by them */
>> +	case 5: key = "DU"; break; /* deleted by us */
>> +	case 6: key = "AA"; break; /* both added */
>> +	case 7: key = "UU"; break; /* both modified */
>> +	}
>> [...]
>> +	fprintf(s->fp, "%c %s %s %06o %06o %06o %06o %s %s %s %s%c",
>> +			unmerged_prefix, key, submodule_token,
>
> Coverity complains that "key" can be uninitialized here. I think it's
> wrong, and just doesn't know that d->stagemask is constrained to 1-7.
>
> But perhaps it is worth adding a:
>
>    default:
> 	die("BUG: unhandled unmerged status %x", d->stagemask);
>
> to the end of the switch. That would shut up Coverity, and give us a
> better indication if our constraint is violated.
>
> -Peff
>

got it. thanks!
Jeff