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From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Package transformations
Date: Mon, 01 Feb 2016 10:18:01 +0100
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To: guix-devel@gnu.org

Hello!

I=E2=80=99ve pushed my =E2=80=9Ctrain hacks=E2=80=9D, which are a continuat=
ion of refactoring
work I had done in December (ca. 64ec0e2):

  =E2=80=A2 =E2=80=98guix build=E2=80=99 has a new =E2=80=98--with-input=E2=
=80=99 option to rewrite the
    dependency graph so you can run:

      guix build guix --with-input=3Dguile=3Dguile-next

    and guess what it does.  :-)

    However, it only works for explicit inputs.

  =E2=80=A2 =E2=80=98guix package=E2=80=99 supports =E2=80=98--with-source=
=E2=80=99 and =E2=80=98--with-input=E2=80=99, with the
    caveat that such transformations are forgotten upon upgrades.

  =E2=80=A2 There=E2=80=99s a fairly generic package transformation framewo=
rk in (guix
    scripts build).

  =E2=80=A2 The documentation of command-line build options is a bit improv=
ed,
    with subsections for each category of options.

Feedback welcome!

Ludo=E2=80=99.