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bd5324c4fc
Upgrades Hydra to the latest master/flake branch. To perform this upgrade, it's needed to do a non-trivial db-migration which provides a massive performance-improvement[1]. The basic ideas behind multi-step upgrades of services between NixOS versions have been gathered already[2]. For further context it's recommended to read this first. Basically, the following steps are needed: * Upgrade to a non-breaking version of Hydra with the db-changes (columns are still nullable here). If `system.stateVersion` is set to something older than 20.03, the package will be selected automatically, otherwise `pkgs.hydra-migration` needs to be used. * Run `hydra-backfill-ids` on the server. * Deploy either `pkgs.hydra-unstable` (for Hydra master) or `pkgs.hydra-flakes` (for flakes-support) to activate the optimization. The steps are also documented in the release-notes and in the module using `warnings`. `pkgs.hydra` has been removed as latest Hydra doesn't compile with `pkgs.nixStable` and to ensure a graceful migration using the newly introduced packages. To verify the approach, a simple vm-test has been added which verifies the migration steps. [1] https://github.com/NixOS/hydra/pull/711 [2] https://github.com/NixOS/nixpkgs/pull/82353#issuecomment-598269471
48 lines
1.4 KiB
Nix
48 lines
1.4 KiB
Nix
{ system, ... }:
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{
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baseConfig = { pkgs, ... }: let
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trivialJob = pkgs.writeTextDir "trivial.nix" ''
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{ trivial = builtins.derivation {
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name = "trivial";
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system = "${system}";
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builder = "/bin/sh";
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allowSubstitutes = false;
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preferLocalBuild = true;
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args = ["-c" "echo success > $out; exit 0"];
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};
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}
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'';
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createTrivialProject = pkgs.stdenv.mkDerivation {
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name = "create-trivial-project";
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dontUnpack = true;
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buildInputs = [ pkgs.makeWrapper ];
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installPhase = "install -m755 -D ${./create-trivial-project.sh} $out/bin/create-trivial-project.sh";
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postFixup = ''
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wrapProgram "$out/bin/create-trivial-project.sh" --prefix PATH ":" ${pkgs.stdenv.lib.makeBinPath [ pkgs.curl ]} --set EXPR_PATH ${trivialJob}
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'';
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};
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in {
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virtualisation.memorySize = 2048;
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time.timeZone = "UTC";
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environment.systemPackages = [ createTrivialProject pkgs.jq ];
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services.hydra = {
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enable = true;
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# Hydra needs those settings to start up, so we add something not harmfull.
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hydraURL = "example.com";
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notificationSender = "example@example.com";
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extraConfig = ''
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email_notification = 1
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'';
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};
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services.postfix.enable = true;
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nix = {
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buildMachines = [{
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hostName = "localhost";
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systems = [ system ];
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}];
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binaryCaches = [];
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};
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};
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}
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