def cat_file_to_cmd(file, command, ignore_status=0, return_output=False):
 if (not os.path.isfile(file)):
  raise NameError(('invalid file %s to cat to command %s' % (file, command)))
 if return_output:
  run_cmd = utils.system_output
 else:
  run_cmd = utils.system
 if (magic.guess_type(file) == 'application/x-bzip2'):
  if base_packages.has_pbzip2():
   cat = 'pbzip2 -d -c'
  else:
   cat = 'bzcat'
 elif (magic.guess_type(file) == 'application/x-gzip'):
  cat = 'zcat'
 elif (magic.guess_type(file) == 'application/x-xz'):
  cat = 'xzcat'
 else:
  cat = 'cat'
 return run_cmd(('%s %s | %s' % (cat, file, command)), ignore_status=ignore_status)

def cat_file_to_cmd ( file , command , ignore_status = 0 , return_output = False ) : if ( not os . path . isfile ( file ) ) : raise NameError ( ( 'invalid file %s to cat to command %s' % ( file , command ) ) ) if return_output : run_cmd = utils . system_output else : run_cmd = utils . system if ( magic . guess_type ( file ) == 'application/x-bzip2' ) : if base_packages . has_pbzip2 ( ) : cat = 'pbzip2 -d -c' else : cat = 'bzcat' elif ( magic . guess_type ( file ) == 'application/x-gzip' ) : cat = 'zcat' elif ( magic . guess_type ( file ) == 'application/x-xz' ) : cat = 'xzcat' else : cat = 'cat' return run_cmd ( ( '%s %s | %s' % ( cat , file , command ) ) , ignore_status = ignore_status )
equivalent to cat file | command but knows to use zcat or bzcat if appropriate .