hack: use variables for dependencies' versions

this way we can more easily check out which versions we're installing by
referring to that set of variables at the very beginning of the file.

here I also made `example-dependencies` be more explicit about all the
dependencies it's installing so that just by looking at `main` one can
tell more precisely what goes on with each command.

Signed-off-by: Ciro S. Costa <ciroscosta@vmware.com>

hack/setup.sh

@@ -26,6 +26,13 @@ readonly KIND_IMAGE=${KIND_IMAGE:-kindest/node:v1.21.1}
 readonly REGISTRY_CONTAINER_NAME=cartographer-registry
 readonly KUBERNETES_CONTAINER_NAME=cartographer-control-plane
 
+readonly CERT_MANAGER_VERSION=1.5.3
+readonly KAPP_CONTROLLER_VERSION=0.24.0
+readonly KNATIVE_SERVING_VERSION=0.25.0
+readonly KPACK_VERSION=0.3.1
+readonly SECRETGEN_CONTROLLER_VERSION=0.5.0
+readonly SOURCE_CONTROLLER_VERSION=0.15.4
+
 main() {
         test $# -eq 0 && show_usage_help
         display_vars $@
@@ -45,7 +52,9 @@ main() {
                         ;;
 
                 example-dependencies)
-                        install_dependencies
+                        install_source_controller
+                        install_kpack
+                        install_knative_serving
                         ;;
 
                 example)
@@ -167,18 +176,10 @@ nodes:
 EOF
 }
 
-install_dependencies() {
-        log "installing example dependencies"
-
-        install_source_controller
-        install_kpack
-        install_knative_serving
-}
-
 install_cert_manager() {
         ytt --ignore-unknown-comments \
                 -f $DIR/overlays/remove-resource-requests-from-deployments.yaml \
-                -f https://github.com/jetstack/cert-manager/releases/download/v1.2.0/cert-manager.yaml |
+                -f https://github.com/jetstack/cert-manager/releases/download/v$CERT_MANAGER_VERSION/cert-manager.yaml |
                 kapp deploy --yes -a cert-manager -f-
 }
 
@@ -191,15 +192,15 @@ install_source_controller() {
 
         ytt --ignore-unknown-comments \
                 -f $DIR/overlays/remove-resource-requests-from-deployments.yaml \
-                -f https://github.com/fluxcd/source-controller/releases/download/v0.15.4/source-controller.crds.yaml \
-                -f https://github.com/fluxcd/source-controller/releases/download/v0.15.4/source-controller.deployment.yaml |
+                -f https://github.com/fluxcd/source-controller/releases/download/v$SOURCE_CONTROLLER_VERSION/source-controller.crds.yaml \
+                -f https://github.com/fluxcd/source-controller/releases/download/v$SOURCE_CONTROLLER_VERSION/source-controller.deployment.yaml |
                 kapp deploy --yes -a gitops-toolkit --into-ns gitops-toolkit -f-
 }
 
 install_kpack() {
         ytt --ignore-unknown-comments \
                 -f $DIR/overlays/remove-resource-requests-from-deployments.yaml \
-                -f https://github.com/pivotal/kpack/releases/download/v0.3.1/release-0.3.1.yaml |
+                -f https://github.com/pivotal/kpack/releases/download/v$KPACK_VERSION/release-$KPACK_VERSION.yaml |
                 kapp deploy --yes -a kpack -f-
 
 }
@@ -211,21 +212,21 @@ install_kapp_controller() {
 
         ytt --ignore-unknown-comments \
                 -f $DIR/overlays/remove-resource-requests-from-deployments.yaml \
-                -f https://github.com/vmware-tanzu/carvel-kapp-controller/releases/download/v0.24.0/release.yml |
+                -f https://github.com/vmware-tanzu/carvel-kapp-controller/releases/download/v$KAPP_CONTROLLER_VERSION/release.yml |
                 kapp deploy --yes -a kapp-controller -f-
 }
 
 install_secretgen_controller() {
         ytt --ignore-unknown-comments \
                 -f $DIR/overlays/remove-resource-requests-from-deployments.yaml \
-                -f https://github.com/vmware-tanzu/carvel-secretgen-controller/releases/download/v0.5.0/release.yml |
+                -f https://github.com/vmware-tanzu/carvel-secretgen-controller/releases/download/v$SECRETGEN_CONTROLLER_VERSION/release.yml |
                 kapp deploy --yes -a secretgen-controller -f-
 }
 
 install_knative_serving() {
         ytt --ignore-unknown-comments \
-                -f https://github.com/knative/serving/releases/download/v0.25.0/serving-core.yaml \
-                -f https://github.com/knative/serving/releases/download/v0.25.0/serving-crds.yaml \
+                -f https://github.com/knative/serving/releases/download/v$KNATIVE_SERVING_VERSION/serving-core.yaml \
+                -f https://github.com/knative/serving/releases/download/v$KNATIVE_SERVING_VERSION/serving-crds.yaml \
                 -f $DIR/overlays/remove-resource-requests-from-deployments.yaml |
                 kapp deploy --yes -a knative-serving -f-
 }