handle sr rescan

src/api/sr.coffee

@@ -24,3 +24,20 @@ exports.set = ->
     continue unless param of params
 
     xapi.call "SR.set_#{field}", SR.ref, params[param]
+
+exports.scan = ->
+  params = @getParams {
+    id: { type: 'string' }
+  }
+
+  # Current user must be an administrator.
+  @checkPermission 'admin'
+
+  try
+    SR = @getObject params.id
+  catch
+    @throw 'NO_SUCH_OBJECT'
+
+  xapi = @getXAPI SR
+
+  xapi.call "SR.scan", SR.ref