[CentOS-devel] [CentOS] jigdo images

Shad L. Lords

slords at lordsfam.net
Thu May 7 03:27:17 UTC 2009

Scott Dowdle wrote:
> Shad,
> ----- "Shad L. Lords" <slords at lordsfam.net> wrote:
>>  From the os directory something like this should produce jigdo 
>> files/templates for all associated iso files.
>> for arch in i386 x86_64
>> do
>>      rsync -a --delete --delete-excluded \
>>          --exclude 'repodata/' --exclude 'EULA' \
>>          --exclude 'GPL' --exclude 'NOTES/' \
>>          --exclude 'RELEASE-NOTES*' --exclude 'RPM-GPG-KEY*' \
>>          --link-dest=../$arch/ $arch/ ${arch}.jigdo/
>>      for iso in $(find ../isos/i386/ -name '*.iso' -size +100000)
>>      do
>>          jigdo-file make-template --force -i $iso \
>>              -j ${iso%.iso}.jigdo -t ${iso%.iso}.template \
>>              --label CentOS=$arch.jigdo/ \
>>              --uri CentOS=http://mirror.centos.org/centos/5/os/$arch/
>> \
>>              ${arch}.jigdo//
>>      done
>> done
>> After the files/templates are created they can be moved to a 
>> different/better location as well as updating the Servers section if 
>> desired.
> Thanks for the recipe.  Worked for me.  My only complaint is that the
 > .template files are about 2/3rds the size of the .iso they are for...
 > so you end up downloading 2/3rds of an ISO as a template, then all of
 > the files that make up the media... and then have to process it for
 > your own .iso.
> If you have a local copy of a the repos it pulls from that is handy...
 > but if not, it seems to be significantly more downloading for the
 > end user than just the .iso media... and the only transfer savings
 > for the provider of the .jigdo (rather than providing the .isos)
 > is that 1/3rd-ish savings over the .iso.
> Is that how it is supposed to work?

I don't have the DVD iso so I'm not sure about that one but when I ran it 
for the CD iso's I got a template of about 15MB for disc1 and < 1MB for 
each of the other discs.  If you remove the exclude for NOTES/ from the 
rsync then the template drops to < 5MB (but you have to download all the 
release notes).

Are you sure you had a complete rsync of the os directory without excluding 
anything prior to running the above command?  This was really more a recipe 
for the CentOS folks to as an example of how easy it would be to create 
jigdo/template files from their master area that could then be pushed to 
the mirrors for everyone to enjoy.


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