Re: rpm dependance solving....

I too have seen this, and played with it. The problem that I am having is not
necessarily getting or building a database of the --requires, and provides,
but it is building a correct dep tree accordingly.

Here is what I mean... I have played with small repositories (local), and
tried to write scripts to resolve deps... This is much harder then it sounds.
For example, check out this command:

   # rpm -q -p --requires ftp://ftp.runlevelzero.net/pub/greg/grab/RPMS/grab-0.2.31-1.i386.rpm
   perl
   rpmlib(PayloadFilesHavePrefix) <= 4.0-1
   rpmlib(CompressedFileNames) <= 3.0.4-1
   /usr/bin/perl

For GRAB, I have 4 required items. The first is easy (because it is a package
name). The rpmlib(s) are harder because they are not in a package, and they
require a certain version. The last is a file (which should have been resolved
by line 1 (perl)). Now writing a script that can parse this everytime
correctly is awfully complex. I don't think it is impossible, and I have
gotten pretty close. Once I start development on GRAB-unstable I will try to
incorporate all of this into the codebase (in one form or another).

Thanks for bringing this up... I saw it before, but actually forgot that it
worked so well! I will start testing...

Greg

On Mon, Apr 08, 2002 at 04:37:34PM -0400, Jef Spaleta wrote:
> from reading the man page for rpm...it looks like the command
> 
> rpm -q -p ftp://path/whatever.rpm  will download only the header
> information for that rpm for the query.
> 
> So I imagine you could do this as part of the grab --update  routine
> with minimal information downloaded to catch the dependancy chain.
> 
> something liek rpm -q --requires -p ftp://path/whatever.rpm  for every
> rpm on the ftp server would catch the depedance information you need. 
> and rpm -q --provides -p ftp://path/whatever.rpm would catch the
> provides.
> 
> You could probably get away with only looking for the provides in the
> header and do the --requires look up during the download phase.
> 
> what do you think?  if rpm really only downloads the header part of the
> rpm during a -p query...you can't get much smaller than that for a
> serverside lookup.
> 
> 
> -jef
> 
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-- 
Greg Kurtzer
[email protected]
http://www.runlevelzero.net
LINUX,... The choice of a GNU generation!
:wq