kexec.init

   1 #!/bin/sh
   2 #
   3 # kexec-load    Load kernel image with kexec
   4 #
   5 # chkconfig:    345 99 01
   6 #
   7 # description:  This tool is used to load a kernel in memory and reboot into the kernel \
   8 #                               loaded in memory using the kexec system call.
   9 #
  10 # $Id$
  11
  12 # Source function library
  13 . /etc/rc.d/init.d/functions
  14
  15 LOAD_KEXEC=yes
  16 KERNEL_IMAGE="/boot/vmlinuz"
  17 INITRD="/boot/initrd"
  18 APPEND=""
  19
  20 # Get service config - may override defaults
  21 [ -f /etc/sysconfig/kexec ] && . /etc/sysconfig/kexec
  22
  23 load() {
  24         if [ -z "$APPEND" ]; then
  25                 local a
  26                 for a in $(cat /proc/cmdline); do
  27                         case "$a" in
  28                                 kexec_*=)
  29                                         # skip entries like:
  30                                         # kexec_jump_back_entry=0x01000201a4814e49
  31                                         ;;
  32                                 *)
  33                                         APPEND="$APPEND $a"
  34                         esac
  35                 done
  36         fi
  37
  38         # convert to real file for readability
  39         if [ -L "$KERNEL_IMAGE" ]; then
  40                 KERNEL_IMAGE=$(readlink -f "$KERNEL_IMAGE")
  41         fi
  42         if [ -L "$INITRD" ]; then
  43                 INITRD=$(readlink -f "$INITRD")
  44         fi
  45
  46         if [ -z "$INITRD" ]; then
  47                 show "Loading kernel image: %s, args [%s]" "$KERNEL_IMAGE" "$APPEND"
  48                 kexec -l "$KERNEL_IMAGE" --append="$APPEND"
  49         else
  50                 show "Loading kernel image: %s, initrd %s, args [%s]" "$KERNEL_IMAGE" "$INITRD" "$APPEND"
  51                 kexec -l "$KERNEL_IMAGE" --initrd="$INITRD" --append="$APPEND"
  52         fi
  53         RETVAL=$?
  54         [ $RETVAL = 0 ] && ok || fail
  55 }
  56
  57 start() {
  58         if [ -f /var/lock/subsys/kexec ]; then
  59                 return
  60         fi
  61         touch /var/lock/subsys/kexec
  62 }
  63
  64 stop() {
  65         if ! is_yes "$LOAD_KEXEC" || [ ! -f /sys/kernel/kexec_loaded ]; then
  66                 return
  67         fi
  68
  69         # skip if already loaded something
  70         if [ "$(cat /sys/kernel/kexec_loaded 2>/dev/null)" = "1" ]; then
  71                 return
  72         fi
  73
  74         load
  75         rm -f /var/lock/subsys/kexec
  76 }
  77
  78 status() {
  79         if [ "$(cat /sys/kernel/kexec_loaded 2>/dev/null)" = "1" ]; then
  80                 show "Kexec image loaded"; ok
  81         else
  82                 show "Kexec image is not loaded"; fail
  83         fi
  84         if [ "$(cat /sys/kernel/kexec_crash_loaded 2>/dev/null)" = 1 ]; then
  85                 show "Kexec image for kernel crash loaded"; ok
  86         else
  87                 show "Kexec image for kernel crash is not loaded"; fail
  88         fi
  89
  90         # convert to real file for readability
  91         if [ -L "$KERNEL_IMAGE" ]; then
  92                 KERNEL_IMAGE=$(readlink -f "$KERNEL_IMAGE")
  93         fi
  94         if [ -L "$INITRD" ]; then
  95                 INITRD=$(readlink -f "$INITRD")
  96         fi
  97         INIT_COL=0 show "Configured kernel: %s" "$KERNEL_IMAGE"; echo
  98         if [ -n "$INITRD" ]; then
  99                 INIT_COL=0 show "Configured initrd: %s" "$INITRD"; echo
 100         fi
 101 }
 102
 103 RETVAL=0
 104 # See how we were called.
 105 case "$1" in
 106   start)
 107         start
 108         ;;
 109   stop)
 110         stop
 111         ;;
 112   restart)
 113         stop
 114         start
 115         ;;
 116   load)
 117         load
 118         ;;
 119   status)
 120         status
 121         ;;
 122   *)
 123         msg_usage "$0 {start|stop|load|restart|status}"
 124         exit 3
 125 esac
 126
 127 exit $RETVAL