Install crossplane cli via nix

crossplane/README.md

@@ -16,6 +16,8 @@ You will needs these:
 - minikube
 - terraform
 
+You may look at [this](https://crossplane.io/docs/v1.1/getting-started/install-configure.html) for additional requirements.
+
 ## Play
 
 Use [Makefile](./Makefile) to provision and run and teardown.

crossplane/crossplane-cli.nix

@@ -0,0 +1,28 @@
+# this derivation is based on https://raw.githubusercontent.com/crossplane/crossplane/master/install.sh
+{ pkgs , artifactVersion ? "v1.1.0" }:
+
+# TODO: support multi OS and arch - currently only darwin_amd64 is hard coded
+
+with pkgs; let
+  # fix this to adapt different arch - https://raw.githubusercontent.com/crossplane/crossplane/master/install.sh
+  os_arch = "darwin_amd64";
+  artifactSha256 = "051vyfmdkf2nmxd3ry175cl3bb0hgklgq00vi2ym52sqyfaplwyl";
+in
+  # https://ops.functionalalgebra.com/nix-by-example/
+  stdenv.mkDerivation rec {
+    name = "crossplane-cli";
+    version = "${artifactVersion}";
+
+    src = fetchurl {
+      url = "https://releases.crossplane.io/stable/${artifactVersion}/bin/${os_arch}/crank";
+      sha256 = "${artifactSha256}";
+    };
+
+    phases = "installPhase";
+
+    installPhase = ''
+      mkdir -p $out/bin
+      cp ${src} $out/bin/kubectl-crossplane
+      chmod +x $out/bin/kubectl-crossplane
+    '';
+  }

crossplane/shell.nix

@@ -1,14 +1,19 @@
 { pkgs ? import <nixpkgs> {} }:
 
-pkgs.mkShell {
-  buildInputs = with pkgs;[
-    minikube
-    kubectl
-    k9s
-    kubernetes-helm
-    terraform_0_14
-  ];
+let
+  crossplane-cli = import ./crossplane-cli.nix { pkgs=pkgs; };
+in
+  pkgs.mkShell {
+    buildInputs = with pkgs;[
+      minikube
+      kubectl
+      k9s
+      kubernetes-helm
+      terraform_0_14
+      crossplane-cli
+    ];
 
   # Environment variables to set here - https://discourse.nixos.org/t/provide-environmental-variables-from-nix/3453/3
   KUBECONFIG = "./.kube/config";
+  DEBUG_NIX = builtins.currentSystem;
 }