Optimize nix build

[sayanarijit]

Due to a known issue nix garbage collector is collecting more packages than it should. The suggested solution is running ln -sfv /root/.cache/nix/tarballs/* /nix/var/nix/gcroots/auto before collecting garbage. However, that doesn't seem to fix the issue.

[hazelweakly]

Does this solution work for you? I've seen a variant of it used elsewhere (eg in iohk's codebase) as ifdPins

  mkPins = inputs:
    pkgs.runCommand "ifd-pins" { } ''
      mkdir $out
      cd $out
      ${lib.concatMapStringsSep "\n" (i: "ln -sv ${i.value} ${i.key}")
      (lib.attrValues
        (lib.mapAttrs (key: value: { inherit key value; }) inputs))}
    '';

[sayanarijit]

Trying a fix in #104

[sayanarijit]

i.e. using NIX_BUILD_SHELL=/nix/var/nix/profiles/default/bin/bash

[sayanarijit]

Seems to be working.