[pacman-dev] delta support in libalpm

[Xavier]

On Thu, Feb 19, 2009 at 11:06 AM, Brendan Hide
<brendan at swiftspirit.co.za> wrote:
> Xavier Wrote:
>>
>> So we don't even have extra decompression/recompression steps, there is no
>> loss.
>>
>> +                       snprintf(command, PATH_MAX, "xdelta3 -d -R -c
>> -s %s %s | gzip -n > %s", from, delta, to);
>
> Sorry. I see the logic now only. :/ The md5s are originally generated after
> using "gzip -n" to do the compression and so Xavier is specifically using
> "gzip -n" to prevent generating a "different" md5sum after applying the
> delta.
>

Ah, no problem, to be honest I wasn't sure how to answer your previous
mail : every statement you made seemed correct, only that you drew a
wrong conclusion from them :)

So yup, this will only work with packages generated from a patched
makepkg, that uses gzip -n as compression. Or well, packages could
also be decompressed and re-compressed with gzip -n.