4 files changed, 99 insertions, 0 deletions
diff --git a/parts/checks.nix b/parts/checks.nix
new file mode 100644
index 0000000..5ccc308
--- /dev/null
+++ b/parts/checks.nix
@@ -0,0 +1,21 @@
+{inputs, ...}: {
+  perSystem = {
+    lib,
+    pkgs,
+    ...
+  }: {
+    checks = {
+      inherit
+        (inputs.flake-checks.lib.mkChecks {
+          root = ../.;
+          inherit pkgs;
+        })
+        actionlint
+        alejandra
+        deadnix
+        editorconfig
+        statix
+        ;
+    };
+  };
+}
diff --git a/parts/ci.nix b/parts/ci.nix
new file mode 100644
index 0000000..5ddc81c
--- /dev/null
+++ b/parts/ci.nix
@@ -0,0 +1,34 @@
+{self, ...}: {
+  perSystem = {
+    lib,
+    pkgs,
+    system,
+    self',
+    ...
+  }: {
+    packages = {
+      ciGate = let
+        toTopLevel = cfg: cfg.config.system.build.toplevel or cfg.activationPackage;
+        isCompatible = cfg: cfg.pkgs.system == system;
+
+        configurations =
+          map
+          (type:
+            lib.mapAttrs (lib.const toTopLevel)
+            (lib.filterAttrs (lib.const isCompatible) self.${type}))
+          [
+            "nixosConfigurations"
+            "darwinConfigurations"
+            "homeConfigurations"
+          ];
+
+        required = lib.concatMap lib.attrValues (
+          lib.flatten [self'.checks self'.devShells configurations]
+        );
+      in
+        pkgs.writeText "ci-gate" (
+          lib.concatMapStringsSep "\n" toString required
+        );
+    };
+  };
+}
diff --git a/parts/default.nix b/parts/default.nix
new file mode 100644
index 0000000..d8da3fe
--- /dev/null
+++ b/parts/default.nix
@@ -0,0 +1,11 @@
+{
+  imports = [
+    ./checks.nix
+    ./ci.nix
+    ./shell.nix
+  ];
+
+  perSystem = {pkgs, ...}: {
+    formatter = pkgs.alejandra;
+  };
+}
diff --git a/parts/shell.nix b/parts/shell.nix
new file mode 100644
index 0000000..ada1ecf
--- /dev/null
+++ b/parts/shell.nix
@@ -0,0 +1,33 @@
+{
+  perSystem = {
+    lib,
+    pkgs,
+    inputs',
+    self',
+    ...
+  }: {
+    devShells = {
+      default = pkgs.mkShellNoCC {
+        packages =
+          [
+            pkgs.nix
+
+            # format + lint
+            pkgs.actionlint
+            self'.formatter
+            pkgs.deadnix
+            pkgs.nil
+            pkgs.statix
+
+            # utils
+            pkgs.deploy-rs
+            pkgs.fzf
+            pkgs.just
+            self'.packages.opentofu
+          ]
+          ++ lib.optional pkgs.stdenv.isDarwin [inputs'.darwin.packages.darwin-rebuild]
+          ++ lib.optionals pkgs.stdenv.isLinux [pkgs.nixos-rebuild inputs'.agenix.packages.agenix];
+      };
+    };
+  };
+}