haskell.nix Enable separate data output more aggressively

cabal2nix (and hence nixpkgs) does it whenever there are data files.

Ours is turned off by default, which in practice means it's basically not used.

Oct 29 '20 12:10 michaelpj

Maybe a nix-tools bug, actually.

Oct 29 '20 12:10 michaelpj

We have a 2.5GB docker image currently (because a couple of packages with data files bring in the entire GHC stack into our docker image.)

Mar 18 '21 18:03 dysinger

Note that you can enable the option yourself if you know the offending packages. Obviously we should do it automatically, but it might help you cut that down in the short term.

Mar 18 '21 18:03 michaelpj

We ended up just setting it as a global value. It's probably the first thing I do on any haskell.nix project, just be sure.

Mar 18 '21 20:03 purefn

Things we could do, not sure which is preferable:

Default enableSeparateDataOutput to true in haskell.nix
Teach nix-tools to be cleverer about setting it when a package has data files

May 17 '22 09:05 michaelpj

Is there a downside to enabling it by default (even if there's no data-files field in a package)?

May 17 '22 20:05 TravisWhitaker

No idea. I'm not sure if there's even ever a reason not to do it.

May 18 '22 09:05 michaelpj