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<atka>hello hpc, do you think transparent hugepages should be set to madvise by default in guix?

<atka>guix system that is

<zimoun>hi!

<civodul>o/

<drakonis>i just found out that nix has optional impure builds as an experimental feature as of the latest update

<civodul>drakonis: hi! it's always had a hidden flag to turn off chroot builds

<civodul>and those were (are?) off by default

<civodul>you could have a derivation with an attribute like __disableChroot = true;

<drakonis>that's for impure builds, no?

<civodul>actually it's __noChroot = true;

<civodul>yes, "impure" in the sense that the build process has access to the whole file system

<drakonis>hm

<civodul>kinda terrible

<civodul>apparently the attribute still exists

<drakonis>i stand corrected

<drakonis>it isnt without its uses

<civodul>though looking at their code, __noChroot = true is forbidden if the build daemon has chroot enabled globally

<civodul>so, not that bad

<civodul>now maybe they added another mechanism recently?

<drakonis> https://discourse.nixos.org/t/nix-2-8-0-released/18714

<drakonis>that's the case

<drakonis>there used to be a PR for it half a decade ago for handling it in a derivation level and keeping it separate from FOD

<drakonis>ah this is content addresse

<drakonis>addressed

<drakonis>this one's perfect for using nix as a CI

<drakonis>CI/CD for project development

<drakonis>since you no longer require external tooling for generating the hashes

<drakonis>only FODs and impure derivations can depend on impure derivations, neat.

<drakonis>i can see a use for this in the form of using addons as inputs

<drakonis> https://github.com/NixOS/nix/pull/6227

<drakonis>having multiple paid contributors does wonders to it

<drakonis>it has improved a lot more than i give them credit for

<drakonis>also nickel has a prototype for interacting with the store

<drakonis>so its looking like tough competition

<drakonis>in a manner of speaking.

<civodul>hmm i see

<civodul>i wonder about the use cases for __impure = true

<civodul>re tough competition, yes, maybe

<civodul>though the two projects are taking different approaches to tackle similar problems

<civodul>and they also don't tackle the exact same set of problems

<civodul>and more importantly, there's more to a project than just code :-)

<drakonis>of course!

<drakonis>there's no shortage of divergences in approaches

<drakonis>i suppose that impure builds are a stand-in for not having a full language there

<drakonis>since in guix you could just call procedures before getting in the build itself

<drakonis>guix policies and constraints dictate otherwise

<drakonis>also i meant procedures within guile itself and not ones that interact with the daemon

<civodul>ah yes, sure

<civodul>anyway it's always interesting to see the direction Nix follows

<drakonis>aye.

IRC channel logs

2022-05-04.log