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Haskell in Nixpkgs/NixOS

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For discussions and questions about Haskell with Nix, cabal2nix and haskellPackages in nixpkgs | Current Docs: https://haskell4nix.readthedocs.io/140 Servers

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21 Sep 2025
@emilazy:matrix.orgemily I guess it looks like either they ported the main() to Python, or they forked from Apple when its main() was Python but Apple have since ported it to C?! 14:24:13
@emilazy:matrix.orgemilyit seems nice to avoid a runtime dependency on Python but I don't know if GHC already pulls that in14:24:41
@emilazy:matrix.orgemily I would say, if this is an "if Darwin, one package, else another" type thing, and the fallback case works fine, then just do that. if it's a dependency only used on Darwin, file_cmds seems more canonical. 14:24:59
@emilazy:matrix.orgemily it looks like GHC is literally the only thing using darwin.(file_cmds.)xattr, though, and the only other thing using darwin.file_cmds is the somewhat stupendously useless darwin.mail_cmds. so if I ever get around to cleaning up some of the source releases that seem like busywork to maintain it's possible it would go away anyway. (OTOH maybe Swift Build will make them less busywork since we can reuse the upstream build systems more.) 14:26:57
@emilazy:matrix.orgemily uh, what does GHC want an xattr(1) for, anyway? 14:27:04
@sternenseemann:systemli.orgsterni (he/him)https://gitlab.haskell.org/ghc/ghc/-/commit/bf65a7c388b14:41:54
@sternenseemann:systemli.orgsterni (he/him)I never checked whether it is actually necessary, Randy set XATTR=/does-not-exist for some bindists. I just packaged the darwin one when GHC started failing because it started executing /usr/bin/xattr14:42:43
@sternenseemann:systemli.orgsterni (he/him) emily: ah it used to be a literal fork of the python one (i.e. apple distributed the original (?) tarball and an ed(1) script) http://github.com/nixos/nixpkgs/commit/283d622397539f196416657da9dc804a4ca89846 14:48:17
@sternenseemann:systemli.orgsterni (he/him)I guess now that that has changed, we it is better to use the C one14:48:29
@emilazy:matrix.orgemily the Nix store can't contain xattrs 14:48:50
@emilazy:matrix.orgemilyI believe it strips them automatically14:48:55
@emilazy:matrix.orgemilyso most likely you do not need to give it anything14:49:01
@sternenseemann:systemli.orgsterni (he/him)but on write or on fixup14:49:14

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