Oleg Pykhalov <go.wigust@gmail.com> writes:

[…]

> Currently I don't see a way to mount
> /gnu/store/57xj5gcy1jbl9ai2lnrqnpr0dald9i65-coreutils-8.32
> dependencies (and other packages) inside the Nix sandbox.

Found one way:
--8<---------------cut here---------------start------------->8---
(with-output-to-file "/etc/nix/nix.conf"
  (lambda _
    (display "sandbox = true")
    (newline)
    (format #t "build-sandbox-paths = ~{~a ~}~%"
            '#$(package-closure (map (match-lambda ((name package) package))
                                     (package-inputs nix))))))
--8<---------------cut here---------------end--------------->8---

But I fail to pass a self-written test. :-) Bind mounts are existing
according to nix-daemon with ‘--debug’ flag.  Should investigate more.

Oleg.