Package: kexec-tools
Version: 1:2.0.3-2
Severity: wishlist
I'm using Grub2's saved_entry feature:
/etc/default/grub:
GRUB_SAVEDEFAULT=true
GRUB_DEFAULT=saved
which saves the selection from grub into /boot/grub/grubenv (1st
setting) and uses that setting on the next boot (2nd line). This is
especially useful when multiple kernels (or variants using the Xen
hypervisor) are installed in parallel.
Currently kexec-load from the kexec-tools don't handle this and fail to
load the "default" kernel.
I've locally patched my /etc/init.d/kexec-load to support this:
--- /tmp/x/etc/init.d/kexec-load 2013-01-12 23:04:53.000000000 +0100
+++ /etc/init.d/kexec-load 2013-01-16 22:50:55.969207479 +0100
@@ -39,6 +39,9 @@
data=$(cat /boot/grub/grub.cfg)
default=$(echo "$data" | awk '/^set default/ {print $2}' | cut -d'"'
-f2)
+ if [ "$default" = '${saved_entry}' ]; then
+ default=$(sed -ne 's/^saved_entry=//p' /boot/grub/grubenv)
+ fi
if [ -z "$default" ]; then
default=0
fi
It would be nice if that could be included with Debian and/or upstream.
-- System Information:
Debian Release: 7.0
APT prefers unstable
APT policy: (990, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 3.7.4 (SMP w/2 CPU cores; PREEMPT)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages kexec-tools depends on:
ii debconf [debconf-2.0] 1.5.49
ii libc6 2.13-38
kexec-tools recommends no packages.
kexec-tools suggests no packages.
-- Configuration Files:
/etc/init.d/kexec-load changed:
PATH=/sbin:/bin:/usr/sbin:/usr/bin
NOKEXECFILE=/tmp/no-kexec-reboot
test -r /etc/default/kexec && . /etc/default/kexec
process_grub_entry() {
initrd_image=
while read command args; do
if [ "$command" = "linux" ]; then
echo "$args" | while read kernel append; do
echo KERNEL_IMAGE=\"${prefix}${kernel}\"
echo APPEND=\"${append}\"
done
elif [ "$command" = "initrd" ]; then
initrd_image=${prefix}${args}
fi
done
echo INITRD=\"$initrd_image\"
}
get_grub_kernel() {
test -f /boot/grub/grub.cfg || return
local prefix
mountpoint -q /boot && prefix=/boot || prefix=
data=$(cat /boot/grub/grub.cfg)
default=$(echo "$data" | awk '/^set default/ {print $2}' | cut -d'"'
-f2)
if [ "$default" = '${saved_entry}' ]; then
default=$(sed -ne 's/^saved_entry=//p' /boot/grub/grubenv)
fi
if [ -z "$default" ]; then
default=0
fi
start_offset=$((default + 1))
end_offset=$((default + 2))
# grub entries start with "menuentry" commands. Get the line
# numbers that surround the first entry
offsets=$(echo "$data" | grep -n ^menuentry | cut -d: -f1)
begin=$(echo "$offsets" | tail -n+$start_offset | head -n1)
end=$(echo "$offsets" | tail -n+$end_offset | head -n1)
# If this is the last entry, we need to read to the end of the file
# or to the end of boot entry section
if [ -z "$end" ]; then
numlines=$(echo "$data" | tail --lines=+$begin | grep -n "^###
END" | head -1 | cut -d: -f1)
end=$((begin + numlines - 1))
fi
length=$((end - begin))
entry=$(echo "$data" | tail -n+$begin | head -n$length)
eval $(echo "$entry" | process_grub_entry)
}
do_stop () {
test "$LOAD_KEXEC" = "true" || exit 0
test -x /sbin/kexec || exit 0
test "x`cat /sys/kernel/kexec_loaded`y" = "x1y" && exit 0
if [ -f $NOKEXECFILE ]
then
/bin/rm -f $NOKEXECFILE
exit 0
fi
test "$USE_GRUB_CONFIG" = "true" && get_grub_kernel
REAL_APPEND="$APPEND"
test -z "$REAL_APPEND" && REAL_APPEND="`cat /proc/cmdline`"
log_action_begin_msg "Loading new kernel image into memory"
if [ -z "$INITRD" ]
then
/sbin/kexec -l "$KERNEL_IMAGE" --append="$REAL_APPEND"
else
/sbin/kexec -l "$KERNEL_IMAGE" --initrd="$INITRD"
--append="$REAL_APPEND"
fi
log_action_end_msg $?
}
case "$1" in
start)
# No-op
;;
restart|reload|force-reload)
echo "Error: argument '$1' not supported" >&2
exit 3
;;
stop)
do_stop
;;
*)
echo "Usage: $0 start|stop" >&2
exit 3
;;
esac
exit 0
-- debconf information:
* kexec-tools/use_grub_config: true
* kexec-tools/load_kexec: true
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