Needed: An easier way to build a subset of kernel packages

[Jarod Wilson]

Chuck Ebbert wrote:
> Jarod Wilson wrote:
>   
>> The minimalist approach that comes to mind is to make all the %define
>> build* bits all set to 1/enabled by default, and only flip them to
>> disabled where appropriate, so they'd be equivalent to your allow* idea,
>> in that if you disable them at the top of the spec, they'd stay disabled.
>>
>>     
>
> I like this; right now there are surprises there for the unwary who
> think they can disable things that way.
>   

I've implemented enabling/disabling certain builds at the very top of 
the spec file, and anything you set to not build at the top will NOT be 
turned back on later by an ifarch/ifnarch/etc -- all those have been 
modified such that they only disable things compared with the defaults 
set at the top.

Turns out the complexity of adding --with/--without support only 
resulted in the on/off lines at the top of the spec being slightly 
longer, so one can now additionally pass in, say, --without xen, on the 
rpmbuild line to disable building a xen kernel. For example, here's the 
results of a test build using the modified spec:

$ rpmbuild -bb --without xen --without kdump --without debug kernel-2.6.spec
[...]
Wrote: /data/buildroot/RPMS/x86_64/kernel-2.6.20-1.2937.fc6.x86_64.rpm
Wrote: 
/data/buildroot/RPMS/x86_64/kernel-debuginfo-2.6.20-1.2937.fc6.x86_64.rpm
Wrote: 
/data/buildroot/RPMS/x86_64/kernel-debuginfo-common-2.6.20-1.2937.fc6.x86_64.rpm
Wrote: /data/buildroot/RPMS/x86_64/kernel-devel-2.6.20-1.2937.fc6.x86_64.rpm
Wrote: 
/data/buildroot/RPMS/x86_64/kernel-headers-2.6.20-1.2937.fc6.x86_64.rpm
Executing(%clean): /bin/sh -e /data/buildroot/tmp/rpm-tmp.44498
+ umask 022
+ cd /data/buildroot/BUILD
+ cd kernel-2.6.20
+ rm -rf /data/buildroot/tmp/kernel-2.6.20-1.2937.fc6-root
+ exit 0

Results are exactly as expected/desired. Similar results have been 
observed on an i686 build.

Here's another thought... Would be simple enough to add one more flag, 
along the lines of "--without flavo{,u}rs" that automagically flipped 
off everything but the base kernel build (+debuginfo, devel and 
headers). That's actually likely to be the thing folks would most 
commonly want to do. Worth adding?

Still touching up a few things, but should have this completely 
presentable before lunch tomorrow...

-- 
Jarod Wilson
jwilson at redhat.com