#haskell.nix on 2020-09-10

2020-09-01 01:44 angerman changed the topic of #haskell.nix to: https://input-output-hk.github.io/haskell.nix - alternative haskell infrastructure for nix; logs at https://logs.nix.samueldr.com/haskell.nix

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13:40 <ocharles> I have: trace: To make this a fixed-output derivation but not materialized, set `plan-sha256` to the output of /nix/store/sx305fgscz2dnidxfmhgw7llpn8f0hci-calculateSha

13:41 <ocharles> But that store path doesn't even exist

13:41 <ocharles> Any idea what's going on there?

13:41 <__monty__> Maybe you can instantiate that path?

13:41 <__monty__> Or do you always need a derivation to instantiate?

13:42 <ocharles> Nope, nix doesn't know how to build those paths

13:42 <ocharles> If you meant `nix-store -r /nix/store/sx305fgscz2dnidxfmhgw7llpn8f0hci-calculateSha`, anyway

13:45 <michaelpj> ocharles: https://github.com/input-output-hk/haskell.nix/pull/695

13:45 <michaelpj> this is my fault, we haven't merged my workaround yet

13:45 <michaelpj> maybe we should just revert the helpful method since it doesn't work well :(

13:46 <ocharles> Ah, thanks for the pointer

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15:08 <ocharles> When I use `x.checks` to build all checks for a package, I also end up with a load of Hydra errors: attribute 'x86_64-linux.ch-model-hedgehog.checks.recurseForDerivations' is a Boolean, which is not supported

15:08 <ocharles> Has anyone ran into this? Perhaps just adding `.checks` as a Hydra jobset isn't the right way to do this?

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15:09 <michaelpj> ocharles: https://github.com/input-output-hk/haskell.nix/blob/09526c85558417de609ced98460392460b025b98/lib/default.nix#L183

15:10 <ocharles> That seems to just produce an attrset of things where the values are `.checks`, no?

15:10 <ocharles> I guess I can give it a try!

15:14 <michaelpj> ocharles: ah I see, this is for a package

15:14 <michaelpj> yes, you have to do an annoying dance to filter out `recurseForDerivation` when putting something into Hydra

15:14 <ocharles> Bah

15:15 <michaelpj> I have an example somewhere... it's annoyingly non-trivial

15:15 <michaelpj> quite why hydra chokes over this when it's allegedly a standard thing is beyond me...

15:15 <michaelpj> https://github.com/input-output-hk/haskell.nix/blob/master/ci-lib.nix#L21

15:16 <michaelpj> that might be overly generic, you probably only have a problem with the `recurseForDerivations` in the top level set, so you might just be able to remove that

15:17 <ocharles> Thanks!

15:19 <michaelpj> this is also a handy thing if you're using Hercules too, since it wants `recurseForDerivations` all over the place. At one point we were running both, hence the need for an aggressive clean-out!

15:20 <ocharles> Is Hercules even a thing still?

15:21 <michaelpj> I think so

15:21 <ocharles> oh, cool

15:21 <michaelpj> I hope it survives, I do like it, we just don't quite have the devops capacity atm to keep it going as well as hydra

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22:02 <proofofkeags> does anyone else get the error that hsc2hs is missing when using haskell.nix?

22:02 <proofofkeags> this is my first attempt at using haskell.nix in my project

22:02 <proofofkeags> I'm trying to get cross compilation working to raspberry pi

22:23 <proofofkeags> also it seems like it rebuilds all the dependencies if I so much as add a single line to the stack.yaml

22:23 <proofofkeags> which doesn't seem good

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23:26 <proofofkeags> also how do you add build dependencies to your path in haskell.nix

23:31 <proofofkeags> what I want to be able to do is include git in my nix environment so I can embed the git hash