try git

src/org/SHS/Platforms.groovy

@@ -7,13 +7,15 @@ class Platforms {
 	
 	public void get() {
 		steps.stage("Download platforms.json") {
-			"rm -rf platforms".execute()
-			"git clone --depth 1 ${steps.env.PLATFORMS_GIT} platforms".execute()
+			steps.deleteDir("platforms");
+			steps.dir("platforms") {
+				git url: "${steps.env.PLATFORMS_GIT}"
+			}
 		}
 	}
 	
 	public void forEach(functor, stage_suffix = "") {
-		def root = steps.readJSON(file: 'platforms/platforms.json')
+		def root = steps.readJSON(file: 'platforms/*/platforms.json')
 		root.Platforms.each { key, dist ->
 			if (dist.enabled) {
 				steps.stage ("${key}${stage_suffix}") {