Homebrew formula exhibiting hanging system call

my-formula.rb

require 'formula' 
require 'find'
require 'version'

class MyFormula < Formula 
  BASEDIR=File.dirname(Pathname.new(__FILE__).realpath)
  def self.init
    homepage 'www.foo.com'
    keg_only "We don't need all the stuff on the PATH"
    depends_on 'foo/brew/postgis-15'
    depends_on 'foo/brew/jdbc-postgres'
    depends_on 'foo/brew/qs-tool'
    option 'dont-touch-db', 'Leave the database alone. Should only be used if you have already setup the DB.'
  end

  def init_postgres
    postgres_dir = var/'postgres'

    stop_postgres

    if Dir[postgres_dir].empty?
      mkdir postgres_dir
      chmod 0755, postgres_dir
    else
      ohai "Postgres data directory appears to exist. Skipping initialization."
      return 
    end

    begin
      system "initdb #{postgres_dir}"
    rescue BuildError
      opoo 'Failed to initialise DB'
    end
  end

  def start_postgres
    postgres_dir = var/'postgres'
    begin
      system "pg_ctl -w -D #{postgres_dir} -l #{postgres_dir/'server.log'} status"
    rescue BuildError
      ohai "Postgres server not running"
    end
    begin
      system "pg_ctl -w -D #{postgres_dir} -l #{postgres_dir/'server.log'} start"
    rescue BuildError
      ofail 'Failed to start the Postgres server.'
    end
  end

  def stop_postgres
    postgres_dir = var/'postgres'
    begin
      system "pg_ctl -w -D #{postgres_dir} -m fast stop"
    rescue BuildError
      ohai "Failed to stop the Postgres server, maybe it wasn't running."
    end
    sleep(5.0)
  end


  def create_db(dbname)
    begin
      system "dropdb -h localhost #{dbname}"
    rescue BuildError
      ohai 'Slight problem with postgres. Probably OK tho...'
    end
    system "createdb -h localhost #{dbname}"
  end

  def patch_sql
    inreplace 'sql/postgis.sql' do |s|
      s.gsub! /LANGUAGE '(.*)'/, 'LANGUAGE \1'
    end
  end

  def run_sql(dbname, fname)
    cd 'sql/dev'
    system "psql #{dbname} -h localhost -f #{fname}"
    cd '../..'
  end

  def install
    MyFormula.const_set("NAME", "prod#{version.to_s.delete('.')}")
    ENV['NAME'] = NAME
    ohai "$NAME = #{ENV['NAME']}"

    # Hook up a suitable JRE
    unless ENV.has_key? 'JAVA_HOME'
      java_home = `/usr/libexec/java_home`.strip
      ohai "Guessing $JAVA_HOME = #{java_home}"
      ENV['JAVA_HOME'] = java_home
    end
    system "ln -fhs #{ENV['JAVA_HOME']} #{prefix}/jre"

    patch_sql

    # .prefs files
    fix_prefs

    # Clean non-Mac files.
    Find.find('.') do |f|
      ['\.bat$', '\.dll$', '\.exe$', '\.so$', '\.sl$', '\.a$'].each do |pattern|
        rm f if f.match pattern
      end
    end

    # Start Postgres and create DB
    unless build.include? 'dont-touch-db'
      init_postgres
      start_postgres
      create_db NAME
      run_sql(NAME, 'run_all_dev_postgres.sql')
    end

    generate_keys

    # Install files
    prefix.install Dir['*']
  end

  def fix_prefs
  end

  # Default keys for this release have already expired, regenerate newer ones.
  def generate_keys
  end
end