: thetango SRPM dependency system

[Axel Thimm]

On Sun, Jul 01, 2007 at 08:16:02AM -0400, Prarit Bhargava wrote:
> The problems associated with bootstrapping an OS on a new architecture have
> been around for a long time.  The issues with doing so are numerous -- how
> to build, what order should the packages in the OS be built in, how to
> identify build dependencies, etc.  Determining a build map, or build tree,
> would go a long way in decreasing the time to entirely rebuild or bootstrap
> an architecture.
> 
> As a starting point, a brute force build method of repeatedly traversing
> the F7 SRPM list alphabetically was done.  This resulted in 
> approximately 2500
> packages built over a week -- far short of the complete list of SRPMS.
> The frequency of successful builds slowed down dramatically after this 
> number
> of SRPMS were built.  The perl-* SRPMS are particularily nasty ...

How can thetango know that perl-Foo will be providing perl(Bar) which
perl-Baz BuildRequires?

E.g. how can any automatic provides be guessed by thetango? A
not-too-far away goal is to have a perl()-like system for python and
other languages, which means more and more BRs depending on virtual
automatic provides that you can only detect after a build, not before.

I guess that if thetango cannot compute the depdency then it probably
gets discarded to at least get some better ordering, but the final
build will still need a brute force iterative approach.

> thetango attempts to resolve the build problem by taking a set of SRPMS and
> building build trees by evaluating the dependencies between the potential
> resulting binary RPMs, and determining the build tree for individual SRPMS.
> 
> * I have not put this in source control yet.  The TODO section has an 
> entry about this and that is something I hope to complete in the next week.
> 
> http://home.comcast.net/~prarit/thetango/
> 
> Prarit Bhargava
> prarit at redhat.com
> oftc.net: #ia64
> 

-- 
Axel.Thimm at ATrpms.net
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