[repo-coord] Re: mach and conditional BuildRequires:

[Jeff Pitman]

On Saturday 27 March 2004 03:23, Fernando Pablo Lopez-Lezcano wrote:
>
> But it looks like mach is using something different to get the
> BuildRequires as it always gets all of them...
>

I'm just starting to get into mach as well; though, there are some 
missing features that DAR has that would be nice to make a totally 
integrated system (for example, standard directory creation and 
synchronization, a la dar-sync). Anyway, mach uses it's own macro 
expansion facility using regular expressions in python.  It's far from 
complete.  

It would be nice if the rpm -D/-E option functions were replicated in 
Python so that mach and other utilities can use them.  This would then 
allow for conditionals or macros to define whatever you want in anyway 
you want (as long as rpm can read it...)

I'm certain some kind of shell script could be hacked up that utilizes 
these; these are just some steps...

1. Grep out the defines.
2. Recursively expand defines as macros themselves. (In case they 
reference macros too.)
3. Assign defines as some pairing in a variable list DEFINES.
4. Generate DEFARGS by taking a pairing from DEFINES (a, b) and 
concatenate to the list of DEFARGS like -D 'a b'.
5. Formulate the rpmdb commandline:
	$ rpmdb $DEFARGS -E '%{expand:%(cat your.spec)}'

Currently, rpmdb will spew some Target buffer overflow out, but it still 
expands and prints to stdout the modified spec file.  If -D 'version 
x.y.z' is part of DEFARGS, then the Source:/Patch: lines will be 
resolved as well...

Anyway, this is definitely something that'd be nice either functioning 
from python or better support from the commandline.  (Maybe spectool 
would be nice to expand into this...)

take care,
-- 
-jeff