GNU bug report logs - #53162
’guix shell ghc@8.4’ downloads ghc@8.10

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Andreas Enge <andreas <at> enge.fr>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#53162: closed (’guix shell
 ghc <at> 8.4’ downloads ghc <at> 8.10)
Date: Mon, 28 Jul 2025 20:55:01 +0000

[Message part 1 (text/plain, inline)]

Your message dated Mon, 28 Jul 2025 22:54:11 +0200
with message-id <aIfjc9kYGTtbruDr <at> jurong>
and subject line Close
has caused the debbugs.gnu.org bug report #53162,
regarding ’guix shell ghc <at> 8.4’ downloads ghc <at> 8.10
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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53162: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=53162
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Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: zimoun <zimon.toutoune <at> gmail.com>
To: bug-guix <at> gnu.org
Subject: ’guix shell ghc <at> 8.4’
 downloads ghc <at> 8.10
Date: Mon, 10 Jan 2022 17:15:55 +0100

Hi,

Using 3dcc74d, I get an unexpected behaviour.  First, all expected:

--8<---------------cut here---------------start------------->8---
$ guix build ghc <at> 8.10 -n
122,4 MB would be downloaded:
   /gnu/store/p8rk5cp1p4b2zky4zj1shfqb11qb5nmk-ghc-8.10.7-doc
   /gnu/store/i92h6i23rnvrvn7xva6w9x7gjkljmfws-ghc-8.10.7

$ guix build ghc <at> 8.4 -n
/gnu/store/5gp4k7ly1smhkx95rhq21nvxmyg687bv-ghc-8.4.4-doc
/gnu/store/wxfr2naibx3qpy4w243a7ga98mchf6g3-ghc-8.4.4
--8<---------------cut here---------------end--------------->8---

I have ghc <at> 8.4 in my local store, but not ghc <at> 8.10.  In addition, no
path between ghc <at> 8.4 and ghc <at> 8.10,

--8<---------------cut here---------------start------------->8---
$ guix graph --path ghc <at> 8.4 ghc <at> 8.10
guix graph: error: no path from 'ghc <at> 8.4.4' to 'ghc <at> 8.10.7'
--8<---------------cut here---------------end--------------->8---

Even, ghc <at> 8.4 is used in the bootstrap chain of ghc <at> 8.10,

--8<---------------cut here---------------start------------->8---
$ guix graph --path ghc <at> 8.10 ghc <at> 8.4
ghc <at> 8.10.7
ghc <at> 8.8.4
ghc <at> 8.6.5
ghc <at> 8.4.4
--8<---------------cut here---------------end--------------->8---

However, tandam!

--8<---------------cut here---------------start------------->8---
$ guix shell -C ghc <at> 8.4
The following derivation will be built:
   /gnu/store/rx0spryh76az0ll6ddy7f7hy8ykhglnh-profile.drv

117,7 MB will be downloaded
 ghc-8.10.7  112.3MiB                                                                                                         3.3MiB/s 00:01 [                  ]   1.9%  C-c C-c
--8<---------------cut here---------------end--------------->8---

From the profile.drv, the culprit is identified:
/gnu/store/…-ghc-package-cache.drv,

--8<---------------cut here---------------start------------->8---
Derive
([("out","/gnu/store/mcmwdg13f5rc9vdklgbmsn6h84bgdp3q-ghc-package-cache","","")]
 ,[("/gnu/store/8m7vppxy4l824yk4036iisk2zy7qzgcx-ghc-8.4.4.drv",["out"])
   ,("/gnu/store/bc5cm1g1b884nvgiysq8x0i0wxplkqhl-ghc-8.10.7.drv",["out"])
   ,("/gnu/store/m0nbbk3vgl637ibrz7z72r5v0dkswpi2-guile-3.0.7.drv",["out"])
   ,("/gnu/store/qcksap17gs36gpnjj3by4d7r7yxfq405-module-import-compiled.drv",["out"])]
 ,["/gnu/store/45dpf18lzvzs6sbmihifw6ch9p6y20yr-ghc-package-cache-builder","/gnu/store/4j2xcm5s0hvmpjm8fdbmb02ipvr6wyxn-module-import"]
 ,"x86_64-linux","/gnu/store/fidl08nms5v63lkqv627zibxpd85zxqb-guile-3.0.7/bin/guile",["--no-auto-compile","-L","/gnu/store/4j2xcm5s0hvmpjm8fdbmb02ipvr6wyxn-module-import","-C","/gnu/store/n7687sw6nkrhpjkdgysgz7baihzipgl0-module-import-compiled","/gnu/store/45dpf18lzvzs6sbmihifw6ch9p6y20yr-ghc-package-cache-builder"]
 ,[("allowSubstitutes","0")
   ,("guix properties","((type . profile-hook) (hook . ghc-package-cache))")
   ,("out","/gnu/store/mcmwdg13f5rc9vdklgbmsn6h84bgdp3q-ghc-package-cache")
   ,("preferLocalBuild","1")])
--8<---------------cut here---------------end--------------->8---


From my perspective, it is a bug from (guix profiles)
’ghc-package-cache-file’ which always includes ’ghc’, currently pointing
to ghc <at> 8.10.

--8<---------------cut here---------------start------------->8---
  (define ghc                                     ;lazy reference
    (module-ref (resolve-interface '(gnu packages haskell)) 'ghc))
--8<---------------cut here---------------end--------------->8---

Well, the fix is not jumping to my eyes.  If someone has an idea to
conditionally remove this reference to ’ghc’?


Cheers,
simon

[Message part 3 (message/rfc822, inline)]

From: Andreas Enge <andreas <at> enge.fr>
To: 53162-done <at> debbugs.gnu.org
Subject: Close
Date: Mon, 28 Jul 2025 22:54:11 +0200

Closing as there does not seem to be any actionable idea for progress.

Andreas

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