diff options
author | Maximilian Bosch <maximilian@mbosch.me> | 2020-03-27 22:09:13 +0100 |
---|---|---|
committer | Maximilian Bosch <maximilian@mbosch.me> | 2020-03-28 23:33:25 +0100 |
commit | bd5324c4fcb990715c64fc40c19341947e04bf17 (patch) | |
tree | 683924c8027bdbe86b7634fa85a58aafd92f1a0c /nixos/modules/services/continuous-integration/hydra/default.nix | |
parent | ea5c800175f3bec015ff04a68649bc1aa422c2e8 (diff) | |
download | nixpkgs-bd5324c4fcb990715c64fc40c19341947e04bf17.tar nixpkgs-bd5324c4fcb990715c64fc40c19341947e04bf17.tar.gz nixpkgs-bd5324c4fcb990715c64fc40c19341947e04bf17.tar.bz2 nixpkgs-bd5324c4fcb990715c64fc40c19341947e04bf17.tar.lz nixpkgs-bd5324c4fcb990715c64fc40c19341947e04bf17.tar.xz nixpkgs-bd5324c4fcb990715c64fc40c19341947e04bf17.tar.zst nixpkgs-bd5324c4fcb990715c64fc40c19341947e04bf17.zip |
hydra: 2020-02-06 -> 2020-03-{24,27}
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
Diffstat (limited to 'nixos/modules/services/continuous-integration/hydra/default.nix')
-rw-r--r-- | nixos/modules/services/continuous-integration/hydra/default.nix | 33 |
1 files changed, 31 insertions, 2 deletions
diff --git a/nixos/modules/services/continuous-integration/hydra/default.nix b/nixos/modules/services/continuous-integration/hydra/default.nix index 8b56207590a..0c335f14f78 100644 --- a/nixos/modules/services/continuous-integration/hydra/default.nix +++ b/nixos/modules/services/continuous-integration/hydra/default.nix @@ -37,6 +37,8 @@ let haveLocalDB = cfg.dbi == localDB; + inherit (config.system) stateVersion; + in { @@ -63,8 +65,7 @@ in }; package = mkOption { - type = types.path; - default = pkgs.hydra; + type = types.package; defaultText = "pkgs.hydra"; description = "The Hydra package."; }; @@ -194,6 +195,34 @@ in config = mkIf cfg.enable { + warnings = optional (cfg.package.migration or false) '' + You're currently deploying an older version of Hydra which is needed to + make some required database changes[1]. As soon as this is done, it's recommended + to run `hydra-backfill-ids` and set `services.hydra.package` to either `pkgs.hydra-unstable` + or `pkgs.hydra-flakes` after that. + + [1] https://github.com/NixOS/hydra/pull/711 + ''; + + services.hydra.package = with pkgs; + mkDefault ( + if pkgs ? hydra + then throw '' + The Hydra package doesn't exist anymore in `nixpkgs`! It probably exists + due to an overlay. To upgrade Hydra, you need to take two steps as some + bigger changes in the database schema were implemented recently[1]. You first + need to deploy `pkgs.hydra-migration`, run `hydra-backfill-ids` on the server + and then deploy either `pkgs.hydra-unstable` or `pkgs.hydra-flakes`. + + If you want to use `pkgs.hydra` from your overlay, please set `services.hydra.package` + explicitly to `pkgs.hydra` and make sure you know what you're doing. + + [1] https://github.com/NixOS/hydra/pull/711 + '' + else if versionOlder stateVersion "20.03" then hydra-migration + else hydra-unstable + ); + users.groups.hydra = { gid = config.ids.gids.hydra; }; |