flake: Add derivation for pass with local otp build

default.nix

@@ -0,0 +1,55 @@
+{ lib
+, stdenv
+, oathToolkit
+, bash
+, expect
+, git
+, gnumake
+, gnupg
+, pass
+, shellcheck
+, which
+}:
+
+stdenv.mkDerivation {
+  pname = "pass-otp";
+  version = "unstable";
+  src = ./.;
+
+  buildInputs = [ oathToolkit ];
+
+  checkInputs = [
+    bash
+    expect
+    git
+    gnumake
+    gnupg
+    pass
+    shellcheck
+    which
+  ];
+
+  dontBuild = true;
+  doCheck = true;
+
+  patchPhase = ''
+    sed -i -e 's|OATH=\$(which oathtool)|OATH=${oathToolkit}/bin/oathtool|' otp.bash
+  '';
+
+  checkPhase = ''
+    make SHELL=$SHELL check
+  '';
+
+  installFlags = [
+    "PREFIX=$(out)"
+    "BASHCOMPDIR=$(out)/share/bash-completions/completions"
+  ];
+
+  meta = with lib; {
+    description = "A pass extension for managing one-time-password (OTP) tokens";
+    homepage = "https://github.com/tadfisher/pass-otp";
+    license = licenses.gpl3Plus;
+    maintainers = with maintainers; [ tadfisher ];
+    platforms = platforms.unix;
+  };
+}

flake.nix

@@ -9,47 +9,12 @@
     flake-utils.lib.eachDefaultSystem (system:
       let pkgs = nixpkgs.legacyPackages.${system}; in
       {
-        defaultPackage = with pkgs; stdenv.mkDerivation {
-          pname = "pass-otp";
-          version = "unstable";
-          src = ./.;
+        defaultPackage = self.packages.${system}.pass-otp;
 
-          buildInputs = [ oathToolkit ];
+        packages = {
+          pass-otp = pkgs.callPackage ./default.nix { };
 
-          checkInputs = [
-            bash
-            expect
-            git
-            gnumake
-            gnupg
-            pass
-            shellcheck
-            which
-          ];
-
-          dontBuild = true;
-          doCheck = true;
-
-          patchPhase = ''
-            sed -i -e 's|OATH=\$(which oathtool)|OATH=${oathToolkit}/bin/oathtool|' otp.bash
-          '';
-
-          checkPhase = ''
-            make SHELL=$SHELL check
-          '';
-
-          installFlags = [
-            "PREFIX=$(out)"
-            "BASHCOMPDIR=$(out)/share/bash-completions/completions"
-          ];
-
-          meta = with lib; {
-            description = "A pass extension for managing one-time-password (OTP) tokens";
-            homepage = "https://github.com/tadfisher/pass-otp";
-            license = licenses.gpl3;
-            maintainers = with maintainers; [ tadfisher ];
-            platforms = platforms.unix;
-          };
+          pass-with-otp = pkgs.pass.withExtensions (e: [ self.packages.${system}.pass-otp ]);
         };
 
         checks.pass-otp = self.defaultPackage.${system};