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bug#35776: Test guix-pack-localstatedir.sh and guix-pack-relocatable.sh

From: Ting-Wei Lan
Subject: bug#35776: Test guix-pack-localstatedir.sh and guix-pack-relocatable.sh crash when /gnu/store doesn't exist
Date: Fri, 17 May 2019 21:47:17 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1

When running these two tests in a clean environment without having Guix
installed first, they crash when trying to obtain the value of
+ guix pack --version
guix pack (GNU Guix)
Copyright (C) 2019 the Guix authors
License GPLv3+: GNU GPL version 3 or later
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
++ guile2.2 -c '(use-modules (guix config))(display %storedir)'
+ NIX_STORE_DIR=/gnu/store
++ guile2.2 -c '(use-modules (guix config))(display %localstatedir)'
In ice-9/eval.scm:
    619:8 19 (_ #(#(#<directory (guile-user) 564bef205140>)))
In ice-9/command-line.scm:
   181:18 18 (_ #<input: string 564bef21ca80>)
In unknown file:
          17 (eval (use-modules (guix config)) #<directory (guile-us…>)
In ice-9/eval.scm:
   721:20 16 (primitive-eval (use-modules (guix config)))
In ice-9/psyntax.scm:
  1235:36 15 (expand-top-sequence ((use-modules (guix config))) _ _ # …)
  1182:24 14 (parse _ (("placeholder" placeholder)) ((top) #(# # …)) …)
   285:10 13 (parse _ (("placeholder" placeholder)) (()) _ c&e (eval) …)
In ice-9/boot-9.scm:
  3377:20 12 (process-use-modules _)
   222:17 11 (map1 (((guix config))))
  3378:31 10 (_ ((guix config)))
  2800:17  9 (resolve-interface (guix config) #:select _ #:hide _ # _ …)
In ice-9/threads.scm:
    390:8  8 (_ _)
In ice-9/boot-9.scm:
  2726:13  7 (_)
In ice-9/threads.scm:
    390:8  6 (_ _)
In ice-9/boot-9.scm:
  2994:20  5 (_)
   2312:4  4 (save-module-excursion #<procedure 564bef1bf1b0 at ice-…>)
  3014:26  3 (_)
In unknown file:
           2 (primitive-load-path "guix/config" #<procedure 564bef15…>)
In guix/config.scm:
     71:6  1 (_)
In unknown file:
           0 (canonicalize-path "/gnu/store")
ERROR: In procedure canonicalize-path:
In procedure canonicalize-path: No such file or directory
+ localstatedir=
FAIL tests/guix-pack-localstatedir.sh (exit status: 1)
It seems to me that the reason is that NIX_STORE_DIR is exported by
test-env script, so the line
NIX_STORE_DIR="`guile -c '(use-modules (guix config))(display %storedir)'`"
not only changes the value of shell variable NIX_STORE_DIR but also
exports it to the environment.
Therefore, the next line
localstatedir="`guile -c '(use-modules (guix config))(display
crashes at guix/config.scm when running the code
(define %store-directory
  (or (and=> (getenv "NIX_STORE_DIR") canonicalize-path)
because NIX_STORE_DIR points to a non-existent path /gnu/store.
I attached a patch to avoid the crash by delaying the modification
to NIX_STORE_DIR, but I am not sure if it is correct to do so.

Attachment: guix-1.0.0-tests-guix-pack-localstatedir.patch
Description: Text Data

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