Changed `working_on_source?` function to `is_source?` and re-organized checking mechanism

crew

@@ -169,7 +169,7 @@ end
 
 def download
   url = @pkg.get_url(@device[:architecture])
-  source = @pkg.working_on_source?(@device[:architecture])
+  source = @pkg.is_source?(@device[:architecture])
 
   if !source
     puts "Precompiled binary available, downloading..."
@@ -418,7 +418,7 @@ end
 
 def build_package (pwd)
   abort "It is not possible to build fake package" if @pkg.is_fake?
-  abort "It is not possible to build without source" if !@pkg.working_on_source?(@device[:architecture])
+  abort "It is not possible to build without source" if !@pkg.is_source?(@device[:architecture])
 
   # download source codes and unpack it
   meta = download

lib/package.rb

@@ -23,8 +23,16 @@ class Package
     end
   end
 
-  def self.working_on_source? (architecture)
+  def self.is_binary? (architecture)
     if !@build_from_source && @binary_url && @binary_url.has_key?(architecture)
+      return true
+    else
+      return false
+    end
+  end
+
+  def self.is_source? (architecture)
+    if is_binary?(architecture) || is_fake?
       return false
     else
       return true