Merge pull request leavez#47 from hardworker/update_options_passing

Update behaviour fixing (issue leavez#38)

Author: leavez

lib/cocoapods-binary/Main.rb

@@ -64,6 +64,18 @@ def keep_source_code_for_prebuilt_frameworks!
 
     Pod::UI.puts "🚀  Prebuild frameworks"
 
+    # Fetch original installer (which is running this pre-install hook) options,
+    # then pass them to our installer to perform update if needed
+    # Looks like this is the most appropriate way to figure out that something should be updated
+    
+    update = nil
+    repo_update = nil
+    
+    include ObjectSpace
+    ObjectSpace.each_object(Pod::Installer) { |installer|
+        update = installer.update
+        repo_update = installer.repo_update
+    }
 
     # control features
     Pod.is_prebuild_stage = true
@@ -83,11 +95,11 @@ def keep_source_code_for_prebuilt_frameworks!
     lockfile = installer_context.lockfile
     binary_installer = Pod::Installer.new(prebuild_sandbox, prebuild_podfile, lockfile)
 
-    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