> That script must be readable and executable by the guixbuild* users
> (thus, its parent directories must be readable/executable as well).

Mmh, it worked till recently... I did chmod a+x /home/dvc and it solved the
permission denied problem on guix/nix/scripts/download. Thanks!

But that doesn't fix my problem with some ghc packages taking extremely
long... Any ideas?

Anyway, I'm hitting problems all the time - need to finally switch to
guixsd :)

FYI commit 384344198dcaa97847e66d3dd82f279ede08d690 causes this on my end,
but I don't currently have time to look in to it...
Backtrace:
In unknown file:
   ?: 19 [primitive-load-path "gnu/tests/install" ...]
In ice-9/eval.scm:
 505: 18 [#<procedure 161e3c0 at ice-9/eval.scm:499:4 (exp)> (define-module
# # ...)]
In ice-9/psyntax.scm:
1106: 17 [expand-top-sequence ((define-module # # # ...)) () ((top)) ...]
 989: 16 [scan ((define-module (gnu tests install) #:use-module ...)) ()
...]
 279: 15 [scan ((#(syntax-object let # ...) (#) (# #) ...)) () ...]
In ice-9/eval.scm:
 411: 14 [eval # ()]
In ice-9/boot-9.scm:
2954: 13 [define-module* (gnu tests install) #:filename ...]
2929: 12 [resolve-imports (((gnu)) ((gnu tests)) ((gnu tests base)) ...)]
2867: 11 [resolve-interface (gnu tests base) #:select ...]
2792: 10 [#<procedure 16d6ec0 at ice-9/boot-9.scm:2780:4 (name #:optional
autoload version #:key ensure)> # ...]
3068: 9 [try-module-autoload (gnu tests base) #f]
2404: 8 [save-module-excursion #<procedure 585e4b0 at
ice-9/boot-9.scm:3069:17 ()>]
3088: 7 [#<procedure 585e4b0 at ice-9/boot-9.scm:3069:17 ()>]
In unknown file:
   ?: 6 [primitive-load-path "gnu/tests/base" ...]
In gnu/tests/base.scm:
 275: 5 [#<procedure 2c67a00 ()>]
In gnu/system/vm.scm:
 475: 4 [system-qemu-image/shared-store-script # # # ...]
In gnu/system.scm:
 635: 3 [operating-system-derivation # # #f]
 340: 2 [operating-system-services # # #f]
 291: 1 [essential-services # # #f]
 191: 0 [non-boot-file-system-service #]

gnu/system.scm:191:4: In procedure non-boot-file-system-service:
gnu/system.scm:191:4: In procedure module-lookup: Unbound variable: #{%
file-system-needed-for-boot?-procedure}#
make[2]: *** [Makefile:4878: make-go] Error 1
make[2]: Leaving directory '/home/dvc/guix'
make[1]: *** [Makefile:4021: all-recursive] Error 1
make[1]: Leaving directory '/home/dvc/guix'
make: *** [Makefile:2677: all] Error 2z