title: Is there a way to lock individual files or directories on fork when using git?
body: <p>We are a team of 60+ developers working on the same product and are moving from SVN to Git and GitHub. We have a process in SVN where in individual files are locked and whenever a developer wants to commit code, he needs to get it unlocked by the owner of the file. Three of us are the owners of the total 150+ files. The unlocking is preceded by a code review. </p>
  
  <p>In Github, we are planning to use the Fork-Clone model - each project a group of dev is working on will do a fork, each developer will do a clone of the fork, write the code &amp; commit to origin, the lead of the feature will do a pull request to upstream.</p>
  
  <p>Though this seems fine, the problem is when a big project gets delivered, it brings in lots of changes for review and hence, increases the load for the file owners. Also, this might happen in the later cycles of development and hence the project might be jeopardized.</p>
  
  <p>One method we thought might work is to have hooks when the git push is done to the origin (fork). There can be one final review git pull to upstream. </p>
  
  <p>However, we could not find any github extensions or push hooks for the same. Is there a quick way (read, existing extension) to do this with Github or should we use the same hooks that we would use with git?</p>