bug#41654: test-name: verify-store + check-contents failing on guix-1.2.0rc2-1.0d4b1af

[Stefan]

Hi!

Today I thought that it should be possible to work around this bug on my 
aarch64 system by mounting /tmp as a tmpfs, backed by swap on a small SD card, 
to prevent any issues due to my NFS root. This worked for the 
trap-cleanup-issue. But to my surprise this didn’t work out for the “dtmp/” 
error.

I was wondering, if using /tmp as a tmpfs on my virtual x86_64 system would 
make the test fail there as well. So I did 

sudo mount -t tmpfs -o size=768M tmpfs /tmp
guix build --check --no-grafts guix@1.2.0-8.7624ebb

But there it was passing.

This is the interesting part from the log of the aarch64 system:

test-name: verify-store + check-contents
location: /tmp/guix-build-guix-1.2.0-8.7624ebb.drv-0/source/tests/store.scm:1156
source:
+ (test-assert
+   "verify-store + check-contents"
+   (with-store
+     s
+     (let* ((text (random-text))
+            (drv (build-expression->derivation
+                   s
+                   "corrupt"
+                   `(let ((out (assoc-ref %outputs "out")))
+                      (call-with-output-file
+                        out
+                        (lambda (port) (display ,text port)))
+                      #t)
+                   #:guile-for-build
+                   (package-derivation
+                     s
+                     %bootstrap-guile
+                     (%current-system))))
+            (file (derivation->output-path drv)))
+       (with-derivation-substitute
+         drv
+         text
+         (and (build-derivations s (list drv))
+              (verify-store s #:check-contents? #t)
+              (begin
+                (chmod file 420)
+                (call-with-output-file
+                  file
+                  (lambda (port) (display "corrupt!" port)))
+                #t)
+              (not (verify-store s #:check-contents? #t))
+              (delete-paths s (list file)))))))
actual-value: #f
actual-error:
+ (%exception
+   #<&store-protocol-error message: "path 
`dtmp/guix-tests/store/rn6xq5kaipp8aanhcnz2hvyfmr3y2laa-mirrors' is not in the 
store" status: 1>)
result: FAIL


Bye

Stefan