hotfix

#!/bin/sh

export GIT_MERGE_AUTOEDIT=no
ruby 'bin/hotfix.rb'
unset GIT_MERGE_AUTOEDIT

hotfix.rb

current_branch = `git rev-parse --abbrev-ref HEAD`

# Check if we are already on a hotfix branch
if (current_branch =~ /hotfix/).nil?

  #####################
  # Hotfix start flow
  #####################

  version = File.read('VERSION').scan(/(\d+)\.(\d+)\.(\d+)/)[0]

  hotfix = Integer(version[2]) + 1
  new_version = "#{version[0]}.#{version[1]}.#{hotfix}"

  if system("git flow hotfix start #{new_version}")

    # Bump version
    File.open('VERSION', 'w'){|f| f.write(new_version)}
    system('git add VERSION')
    system("git commit -m'bumps version to #{new_version}'")

  end

else

  #####################
  # Hotfix finish flow
  #####################

  # Use last commit message as tag message
  last_commit_message = `git log -1 --pretty=%B`.gsub("\n", '')
  last_commit_message.gsub!(' ', '_')

  version = current_branch.scan(/hotfix\/(.+)/)[0][0]
  if system("git flow hotfix finish -m '#{last_commit_message}' '#{version}'")

    system('git push --all && git push --tags')

  end

end

Create Hotfixes even faster with Git Flow and this script.
Put e.g. in your rails/bin directory (framework dependant), put execute rights on hotfix and then bin/hotfix to start and end a hotfix.
The script assumes you have a file named VERSION in your projects directory.
Edit accordingly