How to generate a .template and .jigdo from an iso image?

[Marcelo M. Garcia]

Hi

I read the man page. It says that I have to specify only one of the 
options "-i", "-j" or "-t". OK. If I use only -i, my template has the 
same size of image, then there is no point in using jigdo. There must be 
something more.

My question is how Fedora generates the .template with only 11.1M? The 
command "jigdo-file -i CentOS-5.3-i386-bin-DVD.iso" it's not enough.

Regards

Marcelo

Ignacio Vazquez-Abrams wrote:
> On Thu, 2009-05-07 at 22:00 +0100, Marcelo M. Garcia wrote:
>> Hi.
>>
>> I'm interested in generating the .jigdo and .template from a .iso image. 
>> I couldn't find much information on this. It would be a straightforward 
>> process, just run "jigdo-file file.iso" and I would have my .jigdo and 
>> my .template.
>>
>> The problem is doing like this, my .template has almost the same size of 
>> the .iso image. I noticed that the Fedora 11 x86_64 has only 11.1M. My 
>> question is how to do that? How to get a .template so small?
>>
>> Where I can get a good documentation about jigdo-file? The official web 
>> site[1] it isn't very helpful.
>>
>> Thanks
>>
>> Marcelo
> 
> From man 1 jigdo-file:
> 
> """
>        jigdo-file   COMMAND
>         [ --image=cdrom.iso ] [ --jigdo=cdrom.jigdo  ]
>        [  --template=cdrom.template  ]  [  --force ] [
>        MORE OPTIONS ] [ FILES ... | --files-from=f ]
>         Common  COMMANDs:  make-template,  make-image,
>        verify
> 
>   ...
> 
>        -i --image=cdrom.iso
>               Specify  location of the file containing
>               the image. The image is the  large  file
>               that you want to distribute.
> 
>        -j --jigdo=cdrom.jigdo
>               Specify  location of the Jigsaw Download
>               description file. The jigdo  file  is  a
>               human-readable  file generated by jigdo-
>               file, to which you add information about
>               all  the servers you are going to upload
>               the files to.  jigdo will download  this
>               file as the first step of retrieving the
>               image.
> 
>        -t --template=cdrom.template
>               Specify location of the image ‘template’
>               file. The template file is a binary file
>               generated  by  jigdo-file,  it  contains
>               information  on  how  to  reassemble the
>               image and also (in compressed form)  all
>               the  data  from  the image which was not
>               found in any of the parts.
> 
>               Depending on the command, each of  these
>               three files is used sometimes for input,
>               sometimes for output. If the file is  to
>               be used for output for a particular com-
>               mand and the output file already exists,
>               jigdo-file  exits  with an error, unless
>               --force is present.
> 
>               In most cases, you  will  only  need  to
>               specify one out of -i -j -t, because any
>               missing filenames will be  deduced  from
>               the  one  you  specify.  This is done by
>               first stripping any extension  from  the
>               supplied name and then appending nothing
>               (if  deducing  --image),   ‘.jigdo’   or
>               ‘.template’.
> 
>   ...
> 
>        FILES  Names  of files or directories to use as
>               input. These are the parts that are con-
>               tained  in the image. In case one of the
>               names is a directory, the program recur-
>               sively  scans the directory and adds all
>               files contained in it. While doing this,
>               it  follows  symbolic  links, but avoids
>               symlink loops.
> 
>               If one of the filenames starts with  the
>               character ‘-’, you must precede the list
>               of files with ‘--’. A value of  ‘-’  has
>               no  special  meaning  in  this  list, it
>               stands for a file whose name is a single
>               hyphen.
> """
> 
> 
> 
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