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Nix and non-standard-toplevel-dir

Dear Debian Developers and Maintainers,

I have filled an ITP for the Nix package-manager [1]. During packaging
lintian pointed out [2] that Nix relies on a non-standard-toplevel-dir.

The Nix package-manager keeps by default all packages in the path
`/nix/store`. In principal this path can be changed, but it would make
it impossible to use pre-build binaries from the standard Nixpkgs
channels [3].

The problem are retained dependencies. A package keeps references to
a package it depends on. And this references contain the absolute
path (including `/nix/store`).

Section 5.5.3 and 6.1 of the PHD thesis "The Purely Functional
Software Deployment Model" [4] on which Nix is based gives some more

I would like your advise on how to proceed.

Thanks in advance.


Kai Harries

[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=877019
[2] https://github.com/KaiHa/nix-debian/issues/20
[3] https://nixos.org/nix/manual/#sec-building-source
[4] https://nixos.org/~eelco/pubs/phd-thesis.pdf