Merge pull request #195488 from KoviRobi/gitlab-runner-clear-docker-cache

Gitlab runner clear docker cache

nixos/modules/services/continuous-integration/gitlab-runner.nix

···
         };
       });
     };
+    clear-docker-cache = {
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = lib.mdDoc ''
+          Whether to periodically prune gitlab runner's Docker resources. If
+          enabled, a systemd timer will run {command}`clear-docker-cache` as
+          specified by the `dates` option.
+        '';
+      };
+
+      flags = mkOption {
+        type = types.listOf types.str;
+        default = [ ];
+        example = [ "prune" ];
+        description = lib.mdDoc ''
+          Any additional flags passed to {command}`clear-docker-cache`.
+        '';
+      };
+
+      dates = mkOption {
+        default = "weekly";
+        type = types.str;
+        description = lib.mdDoc ''
+          Specification (in the format described by
+          {manpage}`systemd.time(7)`) of the time at
+          which the prune will occur.
+        '';
+      };
+
+      package = mkOption {
+        default = config.virtualisation.docker.package;
+        defaultText = literalExpression "config.virtualisation.docker.package";
+        example = literalExpression "pkgs.docker";
+        description = lib.mdDoc "Docker package to use for clearing up docker cache.";
+      };
+    };
   };
   config = mkIf cfg.enable {
     warnings = (mapAttrsToList
···
         KillSignal = "SIGQUIT";
         KillMode = "process";
       };
+    };
+    # Enable periodic clear-docker-cache script
+    systemd.services.gitlab-runner-clear-docker-cache = {
+      description = "Prune gitlab-runner docker resources";
+      restartIfChanged = false;
+      unitConfig.X-StopOnRemoval = false;
+
+      serviceConfig.Type = "oneshot";
+
+      path = [ cfg.clear-docker-cache.package pkgs.gawk ];
+
+      script = ''
+        ${pkgs.gitlab-runner}/bin/clear-docker-cache ${toString cfg.clear-docker-cache.flags}
+      '';
+
+      startAt = optional cfg.clear-docker-cache.enable cfg.clear-docker-cache.dates;
     };
     # Enable docker if `docker` executor is used in any service
     virtualisation.docker.enable = mkIf (

pkgs/development/tools/continuous-integration/gitlab-runner/default.nix

···
-{ lib, buildGoModule, fetchFromGitLab, fetchurl }:
+{ lib, buildGoModule, fetchFromGitLab, fetchurl, bash }:
 
 let
   version = "15.4.0";
···
     "-X ${commonPackagePath}.VERSION=${version}"
     "-X ${commonPackagePath}.REVISION=v${version}"
   ];
+
+  # For patchShebangs
+  buildInputs = [ bash ];
 
   vendorSha256 = "sha256-S0x1b2ITtqMoqdssoTgnolDC6Tyq3IdkJqxwZ29qCyU=";
 
···
     rm executors/docker/terminal_test.go
     rm executors/docker/docker_test.go
     rm helpers/docker/auth/auth_test.go
+  '';
+
+  postInstall = ''
+    install packaging/root/usr/share/gitlab-runner/clear-docker-cache $out/bin
   '';
 
   preCheck = ''