add simple helm plugin support (#105)

README.md

@@ -28,6 +28,7 @@ resource_types:
 * `tiller_namespace`: *Optional.* Kubernetes namespace where tiller is running (or will be installed to). (Default: kube-system)
 * `tiller_service_account`: *Optional* Name of the service account that tiller will use (only applies if helm_init_server is true).
 * `repos`: *Optional.* Array of Helm repositories to initialize, each repository is defined as an object with properties `name`, `url` (required) username and password (optional).
+* `plugins`: *Optional.* Array of Helm plugins to install, each defined as an object with properties `url` (required), `version` (optional). 
 * `helm_host`: *Optional* Address of Tiller. Skips helm discovery process. (only applies if `helm_init_server` is false).
 * `tls_enabled`: *Optional* Uses TLS for all interactions with Tiller. (Default: false)
 * `helm_ca`: *Optional* Private CA that is used to issue certificates for Tiller clients and servers (only applies if tls_enabled is true).

assets/common.sh

@@ -128,9 +128,20 @@ wait_for_service_up() {
 
 setup_repos() {
   repos=$(jq -c '(try .source.repos[] catch [][])' < $1)
+  plugins=$(jq -c '(try .source.plugins[] catch [][])' < $1)
   tiller_namespace=$(jq -r '.source.tiller_namespace // "kube-system"' < $1)
 
   local IFS=$'\n'
+
+  for pl in $plugins; do
+    plurl=$(echo $pl | jq -cr '.url')
+    plversion=$(echo $pl | jq -cr '.version // ""')
+    if [ -n "$plversison" ]; then
+      plversionflag="--version $plversion"
+    fi
+    helm plugin install $plurl $plversionflag
+  done
+
   for r in $repos; do
     name=$(echo $r | jq -r '.name')
     url=$(echo $r | jq -r '.url')