bug#60947: Two different derivations for ‘guix’ depending on whether grafts are enabled

[Ludovic Courtès]

Ludovic Courtès <ludovic.courtes@inria.fr> skribis:

> We have a problem!  Depending on whether grafts are enabled, we end up
> building one of two different derivations for ‘guix’ (“real”
> derivations; none of them is a mere grafting derivation):

A similar situation:

--8<---------------cut here---------------start------------->8---
$ guix describe
Generation 244  Jan 29 2023 23:24:35    (current)
  guix 4eccb27
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: master
    commit: 4eccb27b4c74a9112cbbad722d85558e9565f20b
$ guix build ruby-nokogiri -d
/gnu/store/gfry2algsp4rw8mp9d75qlrns1radjar-ruby-nokogiri-1.13.10.drv
$ guix build ruby-nokogiri -d --no-grafts
/gnu/store/vdnp9ila1946dakcrs55x3iwjc781pbi-ruby-nokogiri-1.13.10.drv
--8<---------------cut here---------------end--------------->8---

This is causing a dozen of ‘ruby-’ package that ‘gnome-shell’ depends on
to be rebuilt locally, even though ‘guix weather gnome-shell’ says it’s
available.  Annoying!

Patch coming.

Ludo’.

--- #<buffer amy6awkzzb8spv8i5ns4m5izypjd0nhx-ruby-nokogiri-1.13.10-builder>
+++ #<buffer hiqgagwa3i407nyx3yndzlah835j8rgi-ruby-nokogiri-1.13.10-builder>
@@ -45,7 +45,7 @@
       (assoc-ref %outputs "out"))
     (ruby-build #:name "ruby-nokogiri-1.13.10" #:source 
"/gnu/store/82giwp6r123kky2fg6a0bkx7dyh0vp2h-nokogiri-1.13.10.gem" #:system 
"x86_64-linux" #:gem-flags
                (list "--" "--use-system-libraries"
-                     (string-append "--with-xml2-include=" 
"/gnu/store/g3y6ifhm0751vgsxv90yipfw6mk189kj-libxml2-2.9.12" 
"/include/libxml2"))
+                     (string-append "--with-xml2-include=" 
"/gnu/store/7h3rl7awha559jj0r7ba66njh27sb8pq-libxml2-2.9.12" 
"/include/libxml2"))
                #:test-target "test" #:tests? #f #:phases
                (modify-phases %standard-phases
                  (add-after