Pre-push hook that rejects force pushes to master. Requires Git 1.8.2 and above.

.gitconfig

[push]
  default = current
[alias]
  pfush = "push --force"

pre-push

#!/usr/bin/env ruby
# Pre-push hook that rejects force pushes to master. 
# Requires Git > 1.8.2 

class PushRejecter
  def run
    if pushing_to?(:master) and forced_push?
      reject
    else
      allow
    end
  end
  
  def pushing_to?(branch)
    `git branch | grep "*" | sed "s/* //"`.match(branch.to_s)
  end

  def forced_push?
    `ps -ocommand= -p #{Process.ppid}`.match(/force|pfush/)
  end

  def reject
    puts "Force push to master rejected."
    exit(1)
  end

  def allow
    exit(0)
  end
end

PushRejecter.new.run

Thanks for the pre-push script very helpful, I wanted to use bash instead of ruby so based on this created https://gist.github.com/pixelhandler/5718585