code: def _from(self, line):
          ''' get the FROM container image name from a FROM line!
  
             Parameters
             ==========
             line: the line from the recipe file to parse for FROM
  
          '''
          fromHeader = self._setup('FROM', line)
  
          # Singularity does not support AS level
          self.fromHeader = re.sub("AS .+", "", fromHeader[0], flags=re.I)
  
          if "scratch" in self.fromHeader:
              bot.warning('scratch is no longer available on Docker Hub.')
          bot.debug('FROM %s' %self.fromHeaderf _from(self, line):
          ''' get the FROM container image name from a FROM line!
  
             Parameters
             ==========
             line: the line from the recipe file to parse for FROM
  
          '''
          fromHeader = self._setup('FROM', line)
  
          # Singularity does not support AS level
          self.fromHeader = re.sub("AS .+", "", fromHeader[0], flags=re.I)
  
          if "scratch" in self.fromHeader:
              bot.warning('scratch is no longer available on Docker Hub.')
          bot.debug('FROM %s' %self.fromHeader)
docs: get the FROM container image name from a FROM line!
  
             Parameters
             ==========
             line: the line from the recipe file to parse for FROM