I’m on a quest to to hammer R into increased reproducibility,
and for that I need to build an older C ecosystem with even older
Specifically, I’m trying to override R in nixpkgs 15.09 to version 3.1.1 (see r_ecosystem_track/flake.nix at 1dd7585a5c0e56a44190f489753b4e6babe89d01 · TyberiusPrime/r_ecosystem_track · GitHub for the reproducible example).,
and if I do so, I get a failure because inconsolata.tar.xz has a md5 mismatch.
hash mismatch in fixed-output derivation '/nix/store/gqgbh5dzf0c9qy8nqlil2rcb9l6y8mph-inconsolata.tar.xz': wanted: md5:02zz02684pspc63aqqkzgzy1dw got: md5:5iqcgwj7c2jpggp4shi5jrzsj0
Now, the actual fetchurl that I need to replace is in a string that get’s passed to runCommand which passes it to mkDerivation’s buildCommand.
Now I can access the texlive-inconsolata-1.05 derivation being created here as (builtins.elemAt pkgs.texlive.inconsolata.pkgs 0) - but I don’t know how to get to the fetchurl from that?
Thanks for your insights!