old_contents: """Helper to deal with downloads"""
  
  import os
  import subprocess
  
  
  def execute_shell_script(script, working_dir):
      """Execute a shell script."""
      with open(script, "r") as file:
          execute(file.read(), working_dir)
  
  
  def set_script_variables(values):
      """Sets global variables which can be used by shell scripts."""
      for key, value in values.items():
          os.environ[key] = value
  
  
  def rsync(working_dir, src, dest, ignore_existing=True):
      """rsync 2 folders"""
      if ignore_existing:
          cmd = "rsync -rt --ignore-existing {}/ {}".format(src, dest)
      else:
          cmd = "rsync -rt {}/ {}".format(src, dest)
      subprocess.check_output(["bash", "-c", cmd], cwd=working_dir)
  
  
  def execute(commands, working_dir):
      """Executes a string containing bash commands."""
      try:
          res = subprocess.check_output(["bash", "-c", commands], cwd=working_dir)
          for line in res.splitlines():
              print(line.decode("utf-8"))
      except subprocess.CalledProcessError as exception:
          print(exception.output)
  
new_contents: """Helper to deal with downloads"""
  
  import os
  import stat
  import subprocess
  
  
  def execute_shell_script(script, working_dir):
      """Execute a shell script."""
      st = os.stat(script)
      os.chmod(script, st.st_mode | stat.S_IEXEC)
      subprocess.call(script, shell=True, cwd=working_dir)
  
  
  def set_script_variables(values):
      """Sets global variables which can be used by shell scripts."""
      for key, value in values.items():
          os.environ[key] = value
  
  
  def rsync(working_dir, src, dest, ignore_existing=True):
      """rsync 2 folders"""
      if ignore_existing:
          cmd = "rsync -rt --ignore-existing {}/ {}".format(src, dest)
      else:
          cmd = "rsync -rt {}/ {}".format(src, dest)
      subprocess.check_output(["bash", "-c", cmd], cwd=working_dir)
  
  
  def execute(commands, working_dir):
      """Executes a string containing bash commands."""
      try:
          res = subprocess.check_output(["bash", "-c", commands], cwd=working_dir)
          for line in res.splitlines():
              print(line.decode("utf-8"))
      except subprocess.CalledProcessError as exception:
          print(exception.output)
  
subject: Fix script execution