On 04/12/2013 10:04 AM, Steven Haigh wrote:
> On 04/12/2013 07:05 AM, Pat Riehecky wrote:
>> On 04/11/2013 12:57 PM, Steven Haigh wrote:
>>> Hi all,
>>>
>>> I'm wondering why we don't take advantage of deltarpms for updates on
>>> SL6 (and maybe SL5).
>>>
>>> There are a few people I know that bandwidth is an issue - and
>>> something like this would solve that problem.
>>>
>>> I do know its a bit more work, but it is something that can easily be
>>> automated...
>>>
>>
>> ...... interesting.....
>>
>
> Yeah - it will mean changing the createrepo line to add a the following
> options:
> --deltas - Create delta packages.
>
> --num-deltas - The number of delta versions to cover (I usually
> recommend 3 to 5 depending on how often packages change)
>
> --oldpackagesdirs - This is the main one. This is a directory that
> contains ALL the old packages (including ones no longer in the repo).
> These will be used to create deltas from old versions to new versions.
>
> --max-delta-rpm-size - If you want to only process packages UNDER a
> certain size. Note that this refers to the input package (from what I
> understand).
>
> You'll find the deltas will usually be around 20% of the size of the
> full package (sometimes even less).
>

Oh, and further to this... on Freenode IRC, the user robatino in 
#fedora-qa is a god when it comes to deltarpm / deltaiso. I believe he 
is responsible for the majority of the Fedora delta packages.

-- 
Steven Haigh

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