Add an alternate install location for binary resources. Fixes devices where /data/local/tmp is mounted as noexec, like ZUK Z1. Closes #436.

lib/units/device/resources/util/resource.js

@@ -0,0 +1,21 @@
+var util = require('util')
+
+function Resource(options) {
+  this.src = options.src
+  this.dest = options.dest.shift()
+  this.comm = options.comm
+  this.mode = options.mode
+  this.fallback = options.dest
+}
+
+Resource.prototype.shift = function() {
+  if (this.fallback.length === 0) {
+    throw new Error(util.format(
+      'Out of fallback locations for "%s"'
+    , this.src
+    ))
+  }
+  this.dest = this.fallback.shift()
+}
+
+module.exports = Resource