Re: [SCM] guix source archive branch, master, updated. v0.1-234-g0206513

Re: [SCM] guix source archive branch, master, updated. v0.1-234-g0206513

[Ludovic Courtès]

nikita <nikita@karetnikov.org> skribis:

> commit 02065130de33e990969fe9b7cc19b9b1c24f3ff7
> Author: Nikita Karetnikov <nikita@karetnikov.org>
> Date:   Sun Mar 3 23:20:28 2013 +0000
>
>     utils: Add 'wrap-program'.
>     
>     * guix/build/utils.scm (wrap-program): New procedure.

Such changes should be done in ‘core-updates’, not ‘master’, because
they entail a full rebuild.

So I’ve reverted it in ‘master’ and cherry-picked it in ‘core-updates’.

Ludo’.

Re: [SCM] guix source archive branch, master, updated. v0.1-234-g0206513

[Nikita Karetnikov]

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> Such changes should be done in ‘core-updates’, not ‘master’, because
> they entail a full rebuild.

Oh, I'm sorry.  But could you explain why?  I'm puzzled because the
commit doesn't remove anything.

Could you provide a list of files that shouldn't be changed in 'master'?
I guess that 'gnu/packages/base.scm', 'gnu/packages/make-bootstrap.scm',
and 'guix/build' shouldn't be touched.  Anything else?

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Re: [SCM] guix source archive branch, master, updated. v0.1-234-g0206513

[Nikita Karetnikov]

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> Oh, I'm sorry.  But could you explain why?  I'm puzzled because the
> commit doesn't remove anything.

I think that I got it.  The file will be recompiled anyway.  So any file
that uses it will be rebuilt as well.

(The question about the list of files is valid, though.)

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Re: [SCM] guix source archive branch, master, updated. v0.1-234-g0206513

[Ludovic Courtès]

Nikita Karetnikov <nikita@karetnikov.org> skribis:

>> Such changes should be done in ‘core-updates’, not ‘master’, because
>> they entail a full rebuild.
>
> Oh, I'm sorry.  But could you explain why?  I'm puzzled because the
> commit doesn't remove anything.

guix/build/utils.scm is used by every build script; same for
gnu/build/gnu-build-system.scm.  So if you change something there,
everything has to be rebuilt.

The purpose of ‘core-updates’ is to have a staging area for changes that
require full rebuilds, so that users don’t end up rebuild everything
every other day.  ;-)

> Could you provide a list of files that shouldn't be changed in 'master'?
> I guess that 'gnu/packages/base.scm', 'gnu/packages/make-bootstrap.scm',
> and 'guix/build' shouldn't be touched.  Anything else?

make-bootstrap.scm can actually be changed at will.  base.scm can be
changed too, as long as the derivations it defines remain unchanged (for
instance, you can add comments, change ‘hello’, but not glibc.)

If in doubt, try ‘guix build coreutils -n’ after making your change to
see if it entails a full rebuild.

Ludo’.