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Re: What CDs and DVDs should we produce for lenny?

On Wed, Mar 19, 2008 at 12:13:05PM -0400, Lennart Sorensen wrote:
>On Tue, Mar 18, 2008 at 03:14:51AM -0700, Don Armstrong wrote:
>> If someone were to write a general library that did this, it would be
>> trivial to wrap a apache handler around it that fed out iso images for
>> the less popular architectures too. Does someone who knows more about
>> iso9660 and torrents want to write this up for GSoC?
>The package jigit mentions iso-image.pl which is an apache cgi handler
>for serving an iso from a jigdo file on demand.  Unfortunately due to a
>bug (which I just reported) the jigit package fails to include it even
>though it mentiones it in the package description and it is in the
>source package.  Looks useful though.

Oops... :-)

>It probably wouldn't be hard to make a torrent extension based on the
>example in the perl CGI handler.

The problem with that version of jigit/mkimage/iso-image.pl is that
jigdo template files are not designed to be easily seekable; i.e. if
you want to read a lump of the ISO image from offset 567,632,024 then
you need to create the ISO from offset 0 to that point. That'll make
it less than ideal for torrent backends as far as I can see.

The work I've done for jigdoofus (FUSE-based filesystem access) and
mkimage v2 adds:

 * a simple database to cache the offset -> file lookup data

 * (initial) support for just-in-time reading of files from remote

but it still needs significant work to boost performance. I've been a
little distracted lately, but I should get back to it...

Steve McIntyre, Cambridge, UK.                                steve@einval.com
"You can't barbecue lettuce!" -- Ellie Crane

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