On Jan 19, 2011, at 8:44 PM, Jeff Johnson wrote:
>
> On Jan 19, 2011, at 8:39 PM, Per Øyvind Karlsen wrote:
>
>>>
>>>> ie. 'rpm -q foo' might return:
>>>> foo-1-1-mdv2011.0.x86_64
>>>> foo-bar-1-1mdv2011.0.x86_64
>>>>
>>>
>>>
>>> Yep. Can't tell what's what because the syntax isn't predictable.
>> One workaround could be something like this:
>> if(keyp[0] != '^') {
>> Header h;
>> while((h = rpmmiNext(mi)) {
>> he->tag = RPMTAG_NAME;
>> if(headerGet(h, he, 0))
>> if(strlen(keyp) < strlen(he->p.str))
>> rpmmiPrune(mi,...);
>> }
>>
>> This would remove the matches that has a name longer than the package
>> queried for.
>>
>
> strlen isn't a strong enough hint, there's equal length strings
> that parse unambiguously too. Yoy're gonna need some restrictions
s/un// (I said the opposite of what I meant to say).
> on permitted characters in Disttag/Distepoch, just like Version/Release
> cannot contain '-'.
>
And rpmmiPrune() isn't the right solution to a parsing problem either.
A join might work, but there's no way that can be stabilizied on
--query paths to meet luser expectations. It was hard enough
figgering a means for pattern queries.
I'd focus on getting a better *RE in place. You want as much of
a prefix stem as possible so that DB_PARTIAL takes effect.
E.g., a *RE that starts like this: ^.*...
will end up reading every key because there is no prefix stem,
nor is there any way I could figger to make DB_PARTIAL relative to end-of-key.
Reading every key for ~4K package NVRA is _STILL_ less computational
effort than loading every header, as you example above does just
to find the argument to pass to rpmmiPrune(), so stay focussed
on a pattern that matsches strings can be handed to a parser.
hth
73 de Jeff
>> Might not make immediate sense, I'll take a closer look tomorrow,
>> bedtime now. :)
>>
>
> Note I won't be back home until this weekend (and I'm still recovering
> from flu last week).
>
> hth
>
> 73 de Jeff
>> --
>> Regards,
>> Per Øyvind
>> ______________________________________________________________________
>> RPM Package Manager http://rpm5.org
>> Developer Communication List rpm-devel@rpm5.org
>
smime.p7s
Description: S/MIME cryptographic signature
