Sorry, I've closed this with the libtool one.

The attached patch fixes this one too, should I push it to master (as
the last change for git) or to core-updates or staging (as it might seem
looking at the dependencies)?

Happy hacking!
Miguel
From 9f0e9eea6d7c338fba234c2f8935ba76b1d94b2c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miguel=20=C3=81ngel=20Arruga=20Vivas?=
 <rosen644...@gmail.com>
Date: Mon, 16 Nov 2020 19:06:40 +0100
Subject: [PATCH] gnu: git: Add phase to restore hooks shebang.

Fixes <https://bugs.gnu.org/25508>.

* gnu/packages/version-control.scm (git)[arguments]: New phase
restore-sample-hooks-shebang.
---
 gnu/packages/version-control.scm | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/gnu/packages/version-control.scm b/gnu/packages/version-control.scm
index 3e46a6162b..1842528ff6 100644
--- a/gnu/packages/version-control.scm
+++ b/gnu/packages/version-control.scm
@@ -391,6 +391,16 @@ as well as the classic centralized workflow.")
               (install-file "contrib/subtree/git-subtree.1"
                             (string-append subtree "/share/man/man1"))
               #t)))
+         (add-after 'install 'restore-sample-hooks-shebang
+           (lambda* (#:key outputs #:allow-other-keys)
+             (let* ((out (assoc-ref outputs "out"))
+                    (dir (string-append out "/share/git-core/templates/hooks")))
+               (for-each (lambda (file)
+                           (format #t "restoring shebang on `~a'~%" file)
+                           (substitute* file
+                             (("^#!.*/bin/sh") "#!/bin/sh")))
+                         (find-files dir ".*"))
+               #t)))
         (add-after 'install 'split
           (lambda* (#:key inputs outputs #:allow-other-keys)
             ;; Split the binaries to the various outputs.
-- 
2.29.2

Leo Famulari <l...@famulari.name> writes:

> From: John Darrington <j...@darrington.wattle.id.au>
> Subject: Not patching shebang in git hook samples ?
> To: guix-de...@gnu.org
> Date: Sun, 22 Jan 2017 14:01:24 +0100 (3 years, 42 weeks, 4 days ago)
>
> The git package ships with a number of sample hook files.  These are shell 
> scripts and
> therefore the #!/bin/sh line gets substituted at  build time.
>
> However these files get installed into every git repostory that is created, 
> and users
> are invited to use them as templates for their own hooks.
>
> This will be fine until both git and bash are updated.  Now the original bash 
> is free
> to be garbage collected.  If that happens, the path: 
> #!/gnu/store/qkw4zrwfybxww8f56nkb6hggxambk89b-bash-4.4.0/bin/sh
> will no longer exist.
>
> I suggest what we turn off the shebang patching for the files in 
> share/templates for git.
>
> J'

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