[Git-Hook] - Missing Deis Env Vars

pre-push

#!/usr/bin/env ruby

# An example hook script to verify what is about to be pushed.  Called by "git
# push" after it has checked the remote status, but before anything has been
# pushed.  If this script exits with a non-zero status nothing will be pushed.

# This script shows a disclaimer with unsetted env vars on your deis cluster,
# only when you do a "git push deis master"
#
# It tries to read a ".env.sample" file to diff with your current set of env
# var on your cluster

class DotEnvParser

  def extract(raw_input)
    env_vars = {}
    raw_input.each_line do |line|
      key, value = line.split("=")
      env_vars[key.gsub(/export/, "").strip] = value
    end
    env_vars
  end

end

class DeisEnvParser
  ENV_VAR_EXTRACT_RE = /^([A-Z_]+?)\s*([^\s]+?)$/

  def extract(raw_input)
    env_vars = {}

    each_var_from(raw_input) do |key, value|
      env_vars[key] = value
    end

    env_vars
  end

  protected

  def each_var_from(raw_input)
    raw_input.scan(ENV_VAR_EXTRACT_RE) do |content_vars|
      yield(content_vars[0], content_vars[1])
    end
  end
end

class EnvDiff

  attr_reader :source, :template

  def initialize(source, template)
    @source = source
    @template = template
  end

  def show_disclaimer
    unsetted_vars_disclaimer = unsetted_vars.map do |env_var|
      "#{env_var} #{"\t"*5}# example #{template[env_var]}"
    end.join("")

    puts(<<-TEXT)
********************************

Hi! You have this vars unsetted on your deis cluster"

#{unsetted_vars_disclaimer}

Let's set them now?

********************************
    TEXT
  end

  def has_unsetted_vars?
    !unsetted_vars.empty?
  end

  protected

  def unsetted_vars
    template.keys - source.keys
  end

end

########### MAIN

$remote_name = ARGV[0] # from git input
$remote_url = ARGV[1] # from git input

CONFIG_FILE_PATH = ".env.sample"

exit unless File.exists?(CONFIG_FILE_PATH)
exit unless $remote_name == "deis"

deis_env_raw = %x(deis config)
deis_vars = DeisEnvParser.new.extract(deis_env_raw)

dot_env_raw = File.read(CONFIG_FILE_PATH)
vars_template = DotEnvParser.new.extract(dot_env_raw)

diff = EnvDiff.new(deis_vars, vars_template)
if diff.has_unsetted_vars?
  diff.show_disclaimer
end