37 lines
1.2 KiB
Python
37 lines
1.2 KiB
Python
#!/usr/bin/env python
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# From http://code.activestate.com/recipes/491277-kexec-the-newest-linux-kernel/
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import sys
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import os
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import subprocess
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import fnmatch
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import rpm
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def newest_kernel_and_initrd():
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ts = rpm.TransactionSet()
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p = max(ts.dbMatch('name', 'kernel'))
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k = [ x for x in p['filenames']
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if fnmatch.fnmatch(x, '/boot/vmlinuz-*') ][0]
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#The initrd is not owned by the kernel rpm but generated in the %post script
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i = '/boot/initrd-%s.img' % k[len('/boot/vmlinuz-'):]
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return (k, i)
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def kexec(kernel, initrd, cmdline=None):
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if cmdline == None:
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cmdline = file('/proc/cmdline').read()[:-1] # strip newline
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r = subprocess.call(['/sbin/kexec', '-l', kernel,
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'--initrd=%s' % initrd,
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'--command-line=%s' % cmdline])
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if r != 0:
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raise Exception('kexec returned %d' % r)
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def program_name():
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return os.path.basename(sys.argv[0])
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def main():
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(k, i) = newest_kernel_and_initrd()
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sys.stderr.write('%s: loading ("%s", "%s")\n' % (program_name(), k, i))
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kexec(k, i)
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sys.stderr.write('%s: reboot to load new kernel\n' % program_name())
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if __name__ == '__main__':
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main()
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