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Viewing changes to utopic/etc/init.d/kexec-load

  • Committer: Dimitri John Ledkov
  • Date: 2014-05-06 18:45:46 UTC
  • Revision ID: dimitri.ledkov@canonical.com-20140506184546-5toyx56xxrue0f0v
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utopic/etc/init.d/kexec-load
 
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#! /bin/sh
 
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### BEGIN INIT INFO
 
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# Provides:             kexec-load
 
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# Required-Start:
 
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# Required-Stop:        $local_fs $remote_fs kexec
 
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# Should-Stop:          autofs
 
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# Default-Start:
 
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# Default-Stop:         6
 
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# Short-Description: Load kernel image with kexec
 
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# Description:
 
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### END INIT INFO
 
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PATH=/sbin:/bin:/usr/sbin:/usr/bin
 
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NOKEXECFILE=/tmp/no-kexec-reboot
 
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. /lib/lsb/init-functions
 
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test -r /etc/default/kexec && . /etc/default/kexec
 
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process_grub_entry() {
 
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        initrd_image=
 
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        while read command args; do
 
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                if [ "$command" = "linux" ]; then
 
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                        echo "$args" | while read kernel append; do
 
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                        echo KERNEL_IMAGE=\"${prefix}${kernel}\"
 
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                        echo APPEND=\"${append}\"
 
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                        done
 
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                elif [ "$command" = "initrd" ]; then
 
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                        initrd_image=${prefix}${args}
 
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                fi
 
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        done
 
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        echo INITRD=\"$initrd_image\"
 
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}
 
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get_grub_kernel() {
 
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        test -f /boot/grub/grub.cfg || return
 
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        local prefix
 
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        mountpoint -q /boot && prefix=/boot || prefix=
 
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        data=$(cat /boot/grub/grub.cfg)
 
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        default=$(echo "$data" | awk '/^set default/ {print $2}' | cut -d'"' -f2)
 
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        if [ "$default" = '${saved_entry}' ]; then 
 
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                default=$(sed -ne 's/^saved_entry=//p' /boot/grub/grubenv)
 
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        fi
 
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        if [ -z "$default" ]; then
 
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                default=0
 
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        fi
 
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        start_offset=$((default + 1))
 
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        end_offset=$((default + 2))
 
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        # grub entries start with "menuentry" commands.  Get the line 
 
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        # numbers that surround the first entry
 
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        offsets=$(echo "$data" | grep -n '^[[:space:]]*menuentry[[:space:]]' | cut -d: -f1)
 
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        begin=$(echo "$offsets" | tail -n+$start_offset | head -n1)
 
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        end=$(echo "$offsets" | tail -n+$end_offset | head -n1)
 
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        # If this is the last entry, we need to read to the end of the file
 
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        # or to the end of boot entry section
 
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        if [ -z "$end" ]; then
 
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                numlines=$(echo "$data" | tail --lines=+$begin | grep -n "^### END" | head -1 | cut -d: -f1)
 
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                end=$((begin + numlines - 1))
 
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        fi
 
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        length=$((end - begin))
 
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        entry=$(echo "$data" | tail -n+$begin | head -n$length)
 
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        eval $(echo "$entry" | process_grub_entry)
 
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}
 
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do_stop () {
 
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        test "$LOAD_KEXEC" = "true" || exit 0
 
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        test -x /sbin/kexec || exit 0
 
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        test "x`cat /sys/kernel/kexec_loaded`y" = "x1y" && exit 0
 
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        if [ -f $NOKEXECFILE ]
 
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        then
 
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                /bin/rm -f $NOKEXECFILE
 
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                exit 0
 
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        fi
 
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        test "$USE_GRUB_CONFIG" = "true" && get_grub_kernel
 
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        REAL_APPEND="$APPEND"
 
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        test -z "$REAL_APPEND" && REAL_APPEND="`cat /proc/cmdline`"
 
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        log_action_begin_msg "Loading new kernel image into memory"
 
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        if [ -z "$INITRD" ]
 
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        then
 
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                /sbin/kexec -l "$KERNEL_IMAGE" --append="$REAL_APPEND"
 
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        else
 
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                /sbin/kexec -l "$KERNEL_IMAGE" --initrd="$INITRD" --append="$REAL_APPEND"
 
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        fi
 
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        log_action_end_msg $?
 
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}
 
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case "$1" in
 
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  start)
 
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        # No-op
 
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        ;;
 
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  restart|reload|force-reload)
 
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        echo "Error: argument '$1' not supported" >&2
 
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        exit 3
 
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        ;;
 
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  stop)
 
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        do_stop
 
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        ;;
 
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  *)
 
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        echo "Usage: $0 start|stop" >&2
 
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        exit 3
 
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        ;;
 
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esac
 
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exit 0