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#!/usr/bin/env bash
# Defaults
LAYOUT=compat
BOOTPART=/boot
KNAME=kernel
INITRD=initramfs.img
instkern_state=/var/lib/misc/installkernel
if [[ -s ${instkern_state} ]]; then
# If we have a log file, set defaults from there.
IFS=$'\t' read -r -a LastKernArray <<< "$(tail -n1 ${instkern_state})"
LAYOUT="${LastKernArray[4]}"
BOOTPART="${LastKernArray[7]}"
KNAME="${LastKernArray[8]}"
if [[ "${LastKernArray[9]}" != unknown && ${LAYOUT} != uki ]]; then
INITRD="${LastKernArray[9]}"
else
INITRD=
fi
fi
if [[ ${LAYOUT} == uki ]]; then
echo "WARNING: kexec currently does not support UKIs"
KPARAM=
else
if [[ -f /etc/kernel/cmdline ]]; then
KPARAM="$(tr -s "${IFS}" ' ' </etc/kernel/cmdline)"
elif [[ -f /usr/lib/kernel/cmdline ]]; then
KPARAM="$(tr -s "${IFS}" ' ' </usr/lib/kernel/cmdline)"
else
KPARAM=
fi
fi
# /etc/kexec.conf overrides installkernel.log
kexec_conf=/etc/kexec.conf
if [[ -f ${kexec_conf} ]]; then
source ${kexec_conf}
fi
if [[ -z ${DONT_MOUNT_BOOT} ]]; then
# Borrowed from mount-boot-utils.eclass
# note that /dev/BOOT is in the Gentoo default /etc/fstab file
fstabstate=$(awk "!/^[[:blank:]]*#|^\/dev\/BOOT/ && \$2 == \"${BOOTPART}\" \
{ print 1; exit }" /etc/fstab || die "awk failed")
if [[ -z ${fstabstate} ]]; then
echo "Assuming you do not have a separate ${BOOTPART} partition."
else
procstate=$(awk "\$2 == \"${BOOTPART}\" { split(\$4, a, \",\"); \
for (i in a) if (a[i] ~ /^r[ow]\$/) { print a[i]; break }; exit }" \
/proc/mounts || die "awk failed")
if [[ -z ${procstate} ]]; then
echo "ERROR: Your ${BOOTPART} partition is not mounted"
exit 1
fi
fi
fi
if [[ ! -d ${BOOTPART} ]]; then
echo "ERROR: BOOTPART=${BOOTPART} not found"
exit 1
fi
KEXEC_ARGS=()
if [[ -f ${BOOTPART}/${KNAME} ]]; then
KEXEC_ARGS+=( --load "${BOOTPART}/${KNAME}" )
else
echo "ERROR: KNAME=${KNAME} not found"
exit 1
fi
if [[ -n ${INITRD} ]]; then
if [[ -f ${BOOTPART}/${INITRD} ]]; then
KEXEC_ARGS+=( --initrd "${BOOTPART}/${INITRD}" )
else
echo "WARNING: INITRD=${INITRD} not found"
fi
fi
if [[ -n ${KPARAM} ]]; then
KEXEC_ARGS+=( --command-line "${KPARAM}" )
elif [[ ! -f /etc/kernel/cmdline && ! -f /usr/lib/kernel/cmdline ]]; then
# If it is still empty and we did not intentionally set it empty then reuse.
KEXEC_OPT_ARGS+=" --reuse-cmdline "
fi
KEXEC_ARGS+=( ${KEXEC_OPT_ARGS} )
echo "Calling kexec with arguments: ${KEXEC_ARGS[@]}"
exec kexec "${KEXEC_ARGS[@]}"
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