bug#55583: nar-error on pull

[Brian Cully]

I’m getting an error when trying to pull inside a docker 
container:

--8<---------------cut here---------------start------------->8---
guix# guix pull
substitute: updating substitutes from 
'https://ci.guix.gnu.org'... 100.0%
0.0 MB will be downloaded
le-certs-1  5KiB 
552KiB/s 00:00 [##################] 100.0%Updating channel 'guix' 
from Git repository at 
'https://git.savannah.gnu.org/git/guix.git'...
Authenticating channel 'guix', commits 9edb3f6 to f0e9048 (92 new 
commits)...
Building from this channel:
 guix      https://git.savannah.gnu.org/git/guix.git   f0e9048
substitute: updating substitutes from 
'https://ci.guix.gnu.org'... 100.0%

[…]

lz4-1.9.3  156KiB
libxft-2.3.3  45KiB
perl-5.34.0  15.1MiB
guix substitute: error: mkdir: File exists
Backtrace:
         18 (primitive-load 
         "/gnu/store/p411j4q9hjk639rwcy1p3s6v89c9bxhr-comput
In ice-9/eval.scm:
   155:9 17 (_ _)
   159:9 16 (_ #(#(#(#(#(#(#(#(#(#(#(#(#(#(#(#(#<directory 
   (guile-u?> ?) ?) ?)
In ice-9/boot-9.scm:
   152:2 15 (with-fluid* _ _ _)
   152:2 14 (with-fluid* _ _ _)
In ./guix/store.scm:
 2155:24 13 (run-with-store #<store-connection 256.99 
 7fe9ea44c140> #<procedure
  1983:8 12 (_ #<store-connection 256.99 7fe9ea44c140>)
In ./guix/gexp.scm:
  300:22 11 (_ #<store-connection 256.99 7fe9ea44c140>)
  1181:2 10 (_ #<store-connection 256.99 7fe9df0440f0>)
  1047:2  9 (_ #<store-connection 256.99 7fe9df0440f0>)
   893:4  8 (_ #<store-connection 256.99 7fe9df0440f0>)
In ./guix/store.scm:
 2040:12  7 (_ #<store-connection 256.99 7fe9df0440f0>)
 1395:13  6 (map/accumulate-builds #<store-connection 256.99 
 7fe9df0440f0> #<pr
  1391:5  5 (map/accumulate-builds #<store-connection 256.99 
  7fe9df0440f0> #<pr
 1406:15  4 (_ #<store-connection 256.99 7fe9df0440f0> 
 ("/gnu/store/8v8y8rc4rwd
 1406:15  3 (loop #f)
  711:11  2 (process-stderr #<store-connection 256.99 
  7fe9df0440f0> _)
In ./guix/serialization.scm:
  102:11  1 (read-int #<input-output: file 10>)
    80:6  0 (get-bytevector-n* #<input-output: file 10> 8)

./guix/serialization.scm:80:6: In procedure get-bytevector-n*:
ERROR:
 1. &nar-error:
     file: #f
     port: #<input-output: file 10>
guix pull: error: You found a bug: the program 
'/gnu/store/p411j4q9hjk639rwcy1p3
failed to compute the derivation for Guix (version: 
"f0e9048e98f0789aa98de88984f
host version: "1.3.0-27.598f728"; pull-version: 1).
Please report the COMPLETE output above by email to 
<bug-guix@gnu.org>.
--8<---------------cut here---------------end--------------->8---

The container was made from this manifest:

--8<---------------cut here---------------start------------->8---
(use-modules (gnu))
(use-package-modules shells)

(operating-system
(host-name "guix")
(timezone "America/New_York")

(bootloader (bootloader-configuration
             (bootloader grub-bootloader)
             (targets '("/dev/vda"))))

(file-systems (list
               (file-system
                (mount-point "/")
                (device "/dev/vda1")
                (type "ext4"))))

(packages (append (map specification->package
                       '("zsh"))
                  %base-packages))

(users (cons* (user-account
               (name "bjc")
               (group "users")
               (comment "brian")
               (shell (file-append zsh "/bin/zsh"))
               (home-directory "/home/bjc")
               (supplementary-groups
                '("wheel" "netdev" "audio" "video")))
              %base-user-accounts)))
--8<---------------cut here---------------end--------------->8---

With this command:

--8<---------------cut here---------------start------------->8---
$ guix system image -t docker minimal-sysconf.scm
--8<---------------cut here---------------end--------------->8---

-bjc