Add existence check

announcement.gemspec

@@ -229,6 +229,15 @@ if bundle_update_flag
     #command1 = "gem install bundler -v 2.3.3 ; bundle update --all"
     end
     #end
+    filedata = File.read(env_pwd+"/built_in_extensions.rb")
+    new_filedata = filedata.gsub(/git:\s*(['"])http:\/\/orbitgit\.cloud/, 'git: \1https://orbitgit.cloud')
+    if new_filedata != filedata
+      open(env_pwd+"/built_in_extensions.rb", 'w') { |f|
+        f.write new_filedata
+      }
+      puts "built_in_extensions.rb: 已將 http 改為 https"
+    end
+
     filedata = File.read(env_pwd+"/built_in_extensions.rb")
     exist_str = "gem 'patchfile', git: 'https://orbitgit.cloud/chiu/patch_file.git'"
     if filedata.include? exist_str