nixos/services/hydra.nix

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{ config, lib, pkgs, ... }:
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# hydra user needs to be manually crated
# sudo -u hydra -s
# hydra-create-user $USERNAME --password $PASSWORD --role admin
# https://qfpl.io/posts/nix/starting-simple-hydra/
# also for reference a well written hydra config:
# https://github.com/NixOS/nixos-org-configurations/blob/master/delft/hydra.nix
with lib;
mkIf (elem "hydra" config.machine.services) {
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# also take a look at ../conf/nix.nix
nix.buildMachines = [
{
hostName = "localhost";
system = "x86_64-linux";
supportedFeatures = ["kvm" "nixos-test" "big-parallel" "benchmark"];
maxJobs = 8;
}
];
services.hydra = {
enable = true;
hydraURL = "https://builder.${config.machine.domain}"; # externally visible URL
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listenHost = "localhost";
port = 3001;
minimumDiskFree = 15;
minimumDiskFreeEvaluator = 15;
notificationSender = "hydra@mail.${config.machine.domain}"; # e-mail of hydra service
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useSubstitutes = true;
debugServer = false;
# Hints from hydra-queue-runner:
# binary_cache_dir is deprecated and ignored. use store_uri=file:// instead
# hydra.conf: binary_cache_secret_key_file is deprecated and ignored. use store_uri=...?secret-key= instead
extraConfig = ''
max_output_size = 4294967296
store_uri = file:///var/cache/hydra?secret-key=/secret/hydra_cache&write-nar-listing=1&ls-compression=br&log-compression=br
# add ?local-nar-cache= to set nar cache location
server_store_uri = https://cache.${config.machine.domain}
binary_cache_public_uri https://cache.${config.machine.domain}
upload_logs_to_binary_cache = true
'';
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};
}