Hi, Nix friends. I’ve used hakyll a few different ways over a couple of years and have written a bit about digging in to it and figuring things out (I have a section on the hakyll tutorials, for better or worse), and I’ve put together a hakyll + nix template repository for myself and others to use after experimenting a bit on my own site.
It does a lot of stuff for you that can be read on the readme.
Credits: I leveraged a ton of ideas to figure it out, namely from https://maybevoid.com for the “generator” organization concept, and tons of other blog posts, nixpkgs source code and github issues, etc., to get better at organizing such a project.
Hi! I am struggling trying to run hakyll right now.
I tried to follow your tutorial, however you did not specify the commit hash of nixpkgs you are using and in the current nixpkgs-unstable the package haskellPackages.hakyll is marked as broken (and indead breaks when I allow broken builds). I had to pass the extra option
Thanks to that, I managed to go one step further and now I am stuck at:
$ nix-build --show-trace
building '/nix/store/ngkkipv39p0mcj5qsjw9vmrm4bqmr9k6-cabal2nix-website_perso_hs.drv'...
installing
cabal2nix: nix-prefetch-url: createProcess: runInteractiveProcess: exec: does not exist (No such file or directory)
builder for '/nix/store/ngkkipv39p0mcj5qsjw9vmrm4bqmr9k6-cabal2nix-website_perso_hs.drv' failed with exit code 1
error: while evaluating the attribute 'project' at /home/cyril/git/website_perso_hs/master/release.nix:31:10:
while evaluating the attribute 'website_perso_hs' at /home/cyril/git/website_perso_hs/master/release.nix:22:7:
while evaluating 'callCabal2nix' at /nix/store/7svwiz67sghmhlpddsnarm0jhb5zvds3-nixpkgs-src/pkgs/development/haskell-modules/make-package-set.nix:216
:32, called from /home/cyril/git/website_perso_hs/master/release.nix:22:26:
while evaluating 'callCabal2nixWithOptions' at /nix/store/7svwiz67sghmhlpddsnarm0jhb5zvds3-nixpkgs-src/pkgs/development/haskell-modules/make-package-
set.nix:201:66, called from /nix/store/7svwiz67sghmhlpddsnarm0jhb5zvds3-nixpkgs-src/pkgs/development/haskell-modules/make-package-set.nix:216:38:
while evaluating 'overrideCabal' at /nix/store/7svwiz67sghmhlpddsnarm0jhb5zvds3-nixpkgs-src/pkgs/development/haskell-modules/lib.nix:37:24, called fr
om /nix/store/7svwiz67sghmhlpddsnarm0jhb5zvds3-nixpkgs-src/pkgs/development/haskell-modules/make-package-set.nix:212:10:
while evaluating 'callPackageKeepDeriver' at /nix/store/7svwiz67sghmhlpddsnarm0jhb5zvds3-nixpkgs-src/pkgs/development/haskell-modules/make-package-se
t.nix:157:33, called from /nix/store/7svwiz67sghmhlpddsnarm0jhb5zvds3-nixpkgs-src/pkgs/development/haskell-modules/make-package-set.nix:212:25:
while evaluating 'overrideCabal' at /nix/store/7svwiz67sghmhlpddsnarm0jhb5zvds3-nixpkgs-src/pkgs/development/haskell-modules/lib.nix:37:24, called fr
om /nix/store/7svwiz67sghmhlpddsnarm0jhb5zvds3-nixpkgs-src/pkgs/development/haskell-modules/make-package-set.nix:158:5:
while evaluating 'callPackage' at /nix/store/7svwiz67sghmhlpddsnarm0jhb5zvds3-nixpkgs-src/pkgs/development/haskell-modules/make-package-set.nix:114:2
2, called from /nix/store/7svwiz67sghmhlpddsnarm0jhb5zvds3-nixpkgs-src/pkgs/development/haskell-modules/make-package-set.nix:158:20:
while evaluating 'callPackageWithScope' at /nix/store/7svwiz67sghmhlpddsnarm0jhb5zvds3-nixpkgs-src/pkgs/development/haskell-modules/make-package-set.
nix:74:37, called from /nix/store/7svwiz67sghmhlpddsnarm0jhb5zvds3-nixpkgs-src/pkgs/development/haskell-modules/make-package-set.nix:114:28:
while evaluating 'makeOverridable' at /nix/store/7svwiz67sghmhlpddsnarm0jhb5zvds3-nixpkgs-src/lib/customisation.nix:67:24, called from /nix/store/7sv
wiz67sghmhlpddsnarm0jhb5zvds3-nixpkgs-src/pkgs/development/haskell-modules/make-package-set.nix:97:8:
while evaluating 'drvScope' at /nix/store/7svwiz67sghmhlpddsnarm0jhb5zvds3-nixpkgs-src/pkgs/development/haskell-modules/make-package-set.nix:87:18, c
alled from /nix/store/7svwiz67sghmhlpddsnarm0jhb5zvds3-nixpkgs-src/lib/customisation.nix:69:16:
build of '/nix/store/ngkkipv39p0mcj5qsjw9vmrm4bqmr9k6-cabal2nix-website_perso_hs.drv' failed
cabal2nix: nix-prefetch-url: createProcess: runInteractiveProcess: exec: does not exist (No such file or directory)
This is saying that cabal2nix can’t find the nix-prefetch-url binary.
In theory, cabal2nix probably doesn’t need the nix-prefetch-url binary here, but without access to your actual Nix code, it is hard to see what exactly is going on.
Here’s an upstream issue where someone is running into something similar:
I applied the fix of my previous post (adding -I nixpkgs=[...] as an option to the boostrapping nix shell)
I called niv with the release 20.09: niv update nixpkgs -o NixOS -r release-20.09 -b release-20.09
I renamed the folder website_perso_hs/master and
I substituted hakyll-nix-example for website_perso_hs in the release.nix file
Just for the record, I tried again with only the first two modifications and it goes through with no error. Then tried again from scratch with my renaming inside release.nix. So it seems the problem comes from my renamings (any of them apparently). I cannot see why though: I do not see where else the name hakyll-nix-example could be bound.
EDIT: I found the problem: underscores (_) are not allowed as haskell package names, but they get silently remapped to dashes (-) in the cabal file. Updating release.nix accordingly fixes the problem.
Update: I’ve updated how post titles are converted into URIs by including my new hackage project, slugger, which supports a good number of languages (and more soon). This means that you can have a post title written in any of these languages, and it’ll generate a good filename / URI slug for you!
thanks!