git pre-push hook to prevent force push to master

pre-push

#!/usr/bin/env ruby

# This script has been slightly adapted from:
# http://blog.bigbinary.com/2013/09/19/do-not-allow-force-pusht-to-master.html

class PrePushHandler
  def handle
    reject if force_pushing? && pushing_to_master?
  end

  private
  def current_command
    @current_command ||= `ps -ocommand= -p #{Process.ppid}`
  end

  def force_pushing?
    current_command.match(/--force|-f/)
  end

  def pushing_to_master?
    current_branch == 'master' || current_command.match('master')
  end

  def current_branch
    result = %x{git branch}.split("\n")
    if result.empty?
      feedback "It seems your app is not a git repository."
    else
      result.select { |b| b =~ /^\*/ }.first.split(" ").last.strip
    end
  end

  def reject
    messages = ["Your attempt to FORCE PUSH to MASTER has been rejected."]
    messages << "If you still want to FORCE PUSH then you need to ignore the pre_push git hook by
 executing following command."
    messages << "git push master --force --no-verify"
    feedback messages
  end

  def feedback(messages)
    puts "*" * 40
    [messages].flatten.each do |message|
      puts message
    end
    puts "*" * 40

    exit 1
  end
end

PrePushHandler.new.handle