Print a real hash in paths-from-graph printRegistration

[shlevy]

Currently we have:

print "0000000000000000000000000000000000000000000000000000000000000000\n"; # !!! fix

in paths-from-graph.pl. This breaks the tests for NixOS/nix#1027, because the new path copy code does hash checking. We should store the real hash there.

[shlevy]

@edolstra has said he will work on this

[domenkozar]

Happy to hook up the nixpkgs branch to https://headcounter.org/hydra/jobset/iElectric/nix-without-perl once it's ready.

[domenkozar]

Following files use Nix:: perl namespace in nixpkgs:

maintainers/scripts/copy-tarballs.pl:use Nix::Store;
maintainers/scripts/copy-tarballs.pl:isValidPath("/nix/store/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa-foo"); # FIXME: forces Nix::Store initialisation
nixos/modules/installer/tools/nixos-install.sh:binary_caches=$(@perl@/bin/perl -I @nix@/lib/perl5/site_perl/*/* -e 'use Nix::Config; Nix::Config::readConfig; print $Nix::Config::config{"binary-caches"};')

Maybe we should name this issues as removal of nix+perl in nixpkgs?

[shlevy]

Wrong issue? Anyway we still build the perl bindings as a separate drv.

[shlevy]

Closing this to clear up my open issues list, please open a new one if interested in pursuing this.