Fixed update command options passing by inspecting original Pod::Installer (issue leavez#38)

Author: hardworker

lib/cocoapods-binary/Main.rb

@@ -64,6 +64,12 @@ def keep_source_code_for_prebuilt_frameworks!
 
     Pod::UI.puts "🚀  Prebuild frameworks"
 
+    # Looks like this is the most appropriate way to figure out that something should be updated
+    include ObjectSpace
+    ObjectSpace.each_object(Pod::Installer) { |installer|
+        @update = installer.update
+        @repo_update = installer.repo_update
+    }
 
     # control features
     Pod.is_prebuild_stage = true
@@ -82,11 +88,11 @@ def keep_source_code_for_prebuilt_frameworks!
     # install
     binary_installer = Pod::Installer.new(prebuild_sandbox, prebuild_podfile , nil)
 
-    if binary_installer.have_exact_prebuild_cache?
+    if binary_installer.have_exact_prebuild_cache? && !@update
         binary_installer.install_when_cache_hit!
     else
-        binary_installer.repo_update = false
-        binary_installer.update = false
+        binary_installer.update = @update
+        binary_installer.repo_update = @repo_update
         binary_installer.install!
     end