#!/usr/bin/env python
import sys
import os
import subprocess
import fnmatch
import rpm
def newest_kernel_and_initrd():
ts = rpm.TransactionSet()
p = max(ts.dbMatch('name', 'kernel'))
k = [ x for x in p['filenames']
if fnmatch.fnmatch(x, '/boot/vmlinuz-*') ][0]
#The initrd is not owned by the kernel rpm but generated in the %post script
i = '/boot/initrd-%s.img' % k[len('/boot/vmlinuz-'):]
return (k, i)
def kexec(kernel, initrd, cmdline=None):
if cmdline == None:
cmdline = file('/proc/cmdline').read()[:-1] # strip newline
r = subprocess.call(['/sbin/kexec', '-l', kernel,
'--initrd=%s' % initrd,
'--command-line=%s' % cmdline])
if r != 0:
raise Exception('kexec returned %d' % r)
def program_name():
return os.path.basename(sys.argv[0])
def main():
(k, i) = newest_kernel_and_initrd()
sys.stderr.write('%s: loading ("%s", "%s")\n' % (program_name(), k, i))
kexec(k, i)
sys.stderr.write('%s: reboot to load new kernel\n' % program_name())
if __name__ == '__main__':
main()
