git_check_uncommitted_changes.rb

#! /usr/bin/ruby

# Git before-update hook

def check_uncommitted_changes

  diff_paths = `git diff-index --name-only HEAD`.split("\n")
  diff_stats = `git diff-index --stat HEAD`.split("\n").join("\n    ")
  error_msg  = %(
[GIT POLICY: DIRTY WORKING COPY] 
There are uncommitted changes in server's working copy. Please commit or stash them.
    #{diff_stats}
)
  puts error_msg
  unless diff_paths.nil? || diff_paths.empty? 
	puts error_msg
	exit 1
  end

end

check_uncommitted_changes