nix support

1 files changed, 82 insertions, 0 deletions

diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..661763b
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,82 @@
+{
+  description = "a makeshift CI solution";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+  }: let
+    system = "x86_64-linux";
+    pkgs = import nixpkgs {inherit system;};
+    msci = (pkgs.writeScriptBin
+      "msci" (builtins.readFile ./msci)).overrideAttrs (old: {
+      buildCommand = "${old.buildCommand}\n patchShebangs $out";
+    });
+  in {
+    packages."${system}".msci = pkgs.symlinkJoin {
+      name = "msci";
+      paths = [msci pkgs.jq pkgs.git];
+      buildInputs = [pkgs.makeWrapper];
+      postBuild = "wrapProgram $out/bin/msci --prefix PATH : $out/bin";
+    };
+    nixosModules.default = {
+      lib,
+      config,
+      ...
+    }: let
+      cfg = config.makeshiftci;
+    in {
+      options = with lib; {
+        makeshiftci = mkOption {
+          type = types.submodule {
+            options = {
+              enable = mkEnableOption "enable makeshiftci";
+              dataDir = mkOption {
+                type = types.str;
+                default = "/var/lib/makeshiftci";
+                description = "data directory of makeshiftci";
+              };
+              createUser = mkEnableOption "create a non-root user";
+            };
+          };
+        };
+      };
+      config = lib.mkIf cfg.enable {
+        environment = {
+          sessionVariables.MSCI_HOME = cfg.dataDir;
+          systemPackages = [
+            pkgs.jq
+            pkgs.git
+            self.packages."${system}".msci
+          ];
+        };
+        systemd.tmpfiles.settings."makeshiftci" = {
+          "${cfg.dataDir}" = {
+            d = {
+              user =
+                if cfg.createUser
+                then "makeshiftci"
+                else "root";
+              group =
+                if cfg.createUser
+                then "makeshiftci"
+                else "root";
+              mode = "0750";
+            };
+          };
+        };
+        services.cron.enable = true;
+        users = lib.mkIf cfg.createUser {
+          users."makeshiftci" = {
+            group = "makeshiftci";
+            home = cfg.dataDir;
+            useDefaultShell = true;
+          };
+        };
+      };
+    };
+  };
+}