code: def _write_script(path, lines, chmod=True):
          '''write a script with some lines content to path in the image. This
             is done by way of adding echo statements to the install section.
  
             Parameters
             ==========
             path: the path to the file to write
             lines: the lines to echo to the file
             chmod: If true, change permission to make u+x
  
          '''
          if len(lines) > 0:
              lastline = lines.pop()
          for line in lines:
              self.install.append('echo "%s" >> %s' %path)
          self.install.append(lastline)     
  
          if chmod is True:
              self.install.append('chmod u+x %s' %pathf _write_script(path, lines, chmod=True):
          '''write a script with some lines content to path in the image. This
             is done by way of adding echo statements to the install section.
  
             Parameters
             ==========
             path: the path to the file to write
             lines: the lines to echo to the file
             chmod: If true, change permission to make u+x
  
          '''
          if len(lines) > 0:
              lastline = lines.pop()
          for line in lines:
              self.install.append('echo "%s" >> %s' %path)
          self.install.append(lastline)     
  
          if chmod is True:
              self.install.append('chmod u+x %s' %path)
docs: write a script with some lines content to path in the image. This
             is done by way of adding echo statements to the install section.
  
             Parameters
             ==========
             path: the path to the file to write
             lines: the lines to echo to the file
             chmod: If true, change permission to make u+x