Guix extension to display derivation (and rewrite fixed-output)

[Simon Tournier <zimon.toutoune@gmail.com>]

Hi,

As an Emacs user, exploring Derivation (the .drv files) is easy since
there is an Emacs mode.  However, I have been annoyed with some pipe
through ’sed’ and friends.

Therefore, I wrote a very simple Guix extension [1] that outputs
derivation content using recutils format.

--8<---------------cut here---------------start------------->8---
$ guix drv-show $(guix build hello -d)
name: /gnu/store/qr00sgbh3vwwqswmgjjymg6wkys9r4i2-hello-2.12.1.drv
outputs:
+ /gnu/store/6fbh8phmp3izay6c0dpggpxhcjn4xlm5-hello-2.12.1   [out]
inputs:
+ /gnu/store/3ds56xg6njpw6hnp2w4xpx4psw5mka5q-glibc-2.35.drv                [out]
+ /gnu/store/3zh2qpi897s2x229s93iakji86b08a20-hello-2.12.1.drv              [out]
+ /gnu/store/5bqhdbbl71r9r936w6w8zzqlk41md3wx-glibc-2.35.drv                [out]
+ /gnu/store/67nh3fzviy3q4s8ar8cg0dzhyzgwrwdd-module-import-compiled.drv    [out]
+ /gnu/store/7fsz44vifdc0ws0amnpwnmig3ra6hb53-gcc-11.3.0.drv                [lib]
+ /gnu/store/fchdaawcrxb35llbl7fj7lcsq5asmk4b-guile-2.0.14.drv              [out]
+ /gnu/store/ky030dkfkfr3l8xgdbv45j6bs87988lx-gcc-11.3.0.drv                [lib]
+ /gnu/store/n9kblf5cx4lphrydjr90sp3zfvcdr1pb-glibc-utf8-locales-2.35.drv   [out]
system: x86_64-linux
builder:
+ /gnu/store/4p1l5bdxxbyyqc3wh0d07jv9rp1pdcy7-guile-2.0.14/bin/guile
+ --no-auto-compile
+ -L /gnu/store/a6acf6dds8s9fw7dp5div03rwik0x4x2-module-import
+ -C /gnu/store/yk897hj2p5mdx6hw47s90n8x9pn6s36c-module-import-compiled
+ /gnu/store/fiy8arwqm8vwaqs4h8b361kbmjmd1yra-hello-2.12.1-builder
environment:
+ allowSubstitutes: 0
+ guix properties: ((type . graft) (graft (count . 2)))
+ out: /gnu/store/6fbh8phmp3izay6c0dpggpxhcjn4xlm5-hello-2.12.1
+ preferLocalBuild: 1
--8<---------------cut here---------------end--------------->8---

Do you think it would be useful to package it?  Or maybe to include it
as another subcommand (or part of some subcommand)?

Let me know. :-)

My motivation to do it now is this story:

    https://simon.tournier.info/posts/2024-04-11-rewrite-drv.html


Cheers,
simon

1: https://gitlab.com/zimoun/guix-drv