inaugurate decent devshell

pkgs/applications/networking/cluster/kubectl/default.nix

@@ -0,0 +1,30 @@
+{ stdenv, kubernetes, installShellFiles }:
+
+stdenv.mkDerivation {
+  name = "kubectl-${kubernetes.version}";
+
+  # kubectl is currently part of the main distribution but will eventially be
+  # split out (see homepage)
+  dontUnpack = true;
+
+  nativeBuildInputs = [ installShellFiles ];
+
+  outputs = [ "out" "man" ];
+
+  installPhase = ''
+    install -D ${kubernetes}/bin/kubectl -t $out/bin
+
+    installManPage "${kubernetes.man}/share/man/man1"/kubectl*
+
+    for shell in bash zsh; do
+      $out/bin/kubectl completion $shell > kubectl.$shell
+      installShellCompletion kubectl.$shell
+    done
+  '';
+
+  meta = kubernetes.meta // {
+    description = "Kubernetes CLI";
+    homepage = "https://github.com/kubernetes/kubectl";
+  };
+}
+