Ironic-boot-kernel-parameters

This is a reference script to passing kernel paramters to ironic localboot instance using configdrive. This only works with ubuntu image, so users should modify this script by their own use case:

 #!/usr/bin/env python
 import os

 # Default grub2 config file in Ubuntu
 grub_file = '/etc/default/grub'
 # Add parameters here to pass to instance.
 kernel_parameters = ['quiet', 'splash']
 grub_cmd = 'GRUB_CMDLINE_LINUX'
 old_grub_file = grub_file+'~'
 os.rename(grub_file, old_grub_file)
 cmdline_existed = False
 with open(grub_file, 'w') as writer, \
         open(old_grub_file, 'r') as reader:
         for line in reader:
             key = line.split('=')[0]
             if key == grub_cmd:
                 #If there is already some value:
                 if line.strip()[-1] == '"':
                     line = line.strip()[:-1] + ' ' + ' '.join(kernel_parameters) + '"'
                 cmdline_existed = True
             writer.write(line)
         if not cmdline_existed:
             line = grub_cmd + '=' + '"' + ' '.join(kernel_parameters) + '"'
             writer.write(line)

 os.remove(old_grub_file)
 os.system('update-grub')
 os.system('reboot')