<dhess>
Hi, I just ran into my first "Materialized nix used for ${name} is missing." Hydra evaluation error. I'm pretty uncomfortable with the idea of manually copying things around in the Nix store. Can materialization be made optional?
<__monty__>
That sounds like IFD, which I believe was recently disabled on the nixos hydra?
<dhess>
This is on my own Hydra. I haven't intentionally disabled IFD on it, anyway.
<LnL>
IFD has always been disabled on the nixos instance
<dhess>
also my impression from reading the materialization docs for haskell.nix is that the materialization stuff is not meant to be an error or unusual, it's just an optimization that unfortunately invovles copying things into the nix store (and making them writable?)
<LnL>
but yeah I think there was a change in hydra itself recently which disables it everywhere in an unconfigurable way
<dhess>
My Hydra version is 2020-03-24, so a few months behind.
<LnL>
I've never heard of this tho
<dhess>
I'm trying to build a package with ghcjs, and I'm seeing this materialization message for the first time now.