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<typetetris>
Webapps
<angerman>
Can we say block chain?
<angerman>
Also: compilers :-)
<typetetris>
Is there some example somewhere, how to use haskell.nix with flakes?
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<michaelpj>
typetetris: I believe the flake support code was added by someone else, I don't think we use it at all internally. I assume there's a standard way to get the overlays out of a flake, so do that?
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<typetetris>
michaelpj: Thanks.
<typetetris>
I want to fetch sources for a haskell project with fetchurl, but that just fetches the tar.gz and doesn't extract it. Are there some other options? (Should be a fetcher from nixpkgs as the builtin fetchers all fetch the sources at eval time.)
<__monty__>
typetetris: Why not fetchTarball?
<michaelpj>
yeah, there are plenty of nixpkgs fetchers that handle this sort of thing
<typetetris>
__monty__: fetchTarball is a builtin and will therefore always try to download the sources at eval time, if they are not already in the store. But I would like to avoid downloading sources, if the resulting derivation (like with copy closure or something) is already present in the store.
<typetetris>
sorry for asking, already made a small unpacking derivation myself.
<__monty__>
Ah, didn't even know about the distinction.
<typetetris>
Thats why nixpkgs fetchurl doesn't use a builtin fetcher, but uses a builder.sh calling curl :)
<typetetris>
Just learned it from (guess it ....) clever.
<michaelpj>
typetetris: `nixpgks` `fetchzip` also works for tarballs
<michaelpj>
nixpkgs has a lot of fetchers
<__monty__>
And the nixpkgs fetchers don't exhibit this eagerness? Is there a good reason to stick to builtin fetchers?
<typetetris>
__monty__: I think the fetchers used in nixpkgs itself (except those rarely used) are probably "safe" in this regard. Otherwise a nixos host would download a huge pile of sources needlessly.
<typetetris>
__monty__: fetchTarball for example is only used two times in my checkout of nixpkgs.
<typetetris>
michaelpj: Thanks will take a look at fetchzip
<typetetris>
okay, I will replace all my usages of fetchTarball with fetchzip ...
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