[pacman-dev] delta support in libalpm

Nagy Gabor ngaba at bibl.u-szeged.hu
Fri Nov 14 07:30:20 EST 2008

Idézet Xavier <shiningxc at gmail.com>:

> On Fri, Nov 14, 2008 at 1:02 PM, Nagy Gabor <ngaba at bibl.u-szeged.hu> wrote:
>>> I guess I spoke to soon. I was right concerning xdelta3 using gzip for
>>> handling gzipped files, however it doesn't use the -n flag. This gives
>>> us the same behaviour as xdelta1, with one minor difference: Method 1.
>>> stops working.
>> Wait. I don't understand something. If it doesn't use the -n flag, how can
>> we produce an md5sum-identical patched file? (The mtime is unpredictable.)
>> This poses an extra problem, or not? I just did an effective test on
>> xdelta3-diffing .tar.gz files and I saw that the patched md5sum indeed
>> differ from the original one :-( Maybe we should search for a gzip header
>> manipulation tool...
> One of the proposal was to use gzip -n, which should fix this problem.

xdelta1 used(?) "gzip -n" for _patched_ .tar.gz file, xdelta3 doesn't  
use "-n", so setting "-n" for the original .tar.gz file won't help any  
more. Probably xdelta3 also can be configured or patched to use  
"-n"... Or I may completely misunderstood something...


SZTE Egyetemi Konyvtar - http://www.bibl.u-szeged.hu
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