File grub2-systemd-sleep.sh of Package grub2-702ca0b09c932525140c0e0753e3b905f7554944
#!/bin/bash
#
# Copyright (c) 2015 SUSE LINUX Products GmbH, Nuernberg, Germany.
set -e
GRUB_ONCE="/usr/sbin/grub2-once"
GRUB_ENV="/boot/grub2/grubenv"
GRUB_EDITENV="/usr/bin/grub2-editenv"
GRUB_CONF="/boot/grub2/grub.cfg"
GRUB_SETUP=
BLKID="/usr/sbin/blkid"
LSBLK="/usr/bin/lsblk"
ARCH=`uname -m`
VMLINUZ="vmlinuz"
case $ARCH in
ppc*) VMLINUZ="vmlinux" ;;
s390*) VMLINUZ="image"; GRUB_SETUP="/usr/sbin/grub2-zipl-setup" ;;
esac
error_quit()
{
echo "$1" >&2
exit 1
}
check-system()
{
[ -x "${GRUB_ONCE}" ] || error_quit "ERROR: cannot find or execute ${GRUB_ONCE}"
[ -x "${GRUB_EDITENV}" ] || error_quit "ERROR: cannot find or execute ${GRUB_EDITENV}"
[ -x "${BLKID}" ] || error_quit "ERROR: cannot find or execute ${BLKID}"
[ -r "${GRUB_CONF}" ] || error_quit "ERROR: cannot find or read ${GRUB_CONF}"
}
compare-fsuuid()
{
local uuids=($($LSBLK -n -o UUID $1 $2 2>/dev/null))
if [ ${#uuids[@]} -eq 2 ] && [ "${uuids[0]}" = "${uuids[1]}" ]; then
return 0
fi
return 1
}
#####################################################################
# gets a list of available kernels from /boot/grub2/grub.cfg
# kernels are in the array $KERNELS
get-kernels()
{
local I DUMMY MNT ROOTDEV
declare -i I=0
# we need the root partition later to decide if this is the kernel to select
while read ROOTDEV MNT DUMMY; do
[ "$ROOTDEV" = "rootfs" ] && continue # not what we are searching for
if [ "$MNT" = "/" ]; then
break
fi
done < /proc/mounts
while read -r LINE; do
case $LINE in
menuentry\ *)
local PATTERN="^\\s*menuentry\\s\\+\\(.\\+\\)\\s*{.*\$"
MENUENTRY_OPTS=`echo "$LINE" | sed -n -e "s/${PATTERN}/\\1/p"`
MENU_ENTRIES[$I]=`eval "printf \"%s\n\" $MENUENTRY_OPTS | head -1"`
;;
set\ default*)
local DEFAULT=${LINE#*default=}
if echo $DEFAULT | grep -q saved_entry ; then
local SAVED=`$GRUB_EDITENV $GRUB_ENV list | sed -n s/^saved_entry=//p`
if [ -n "$SAVED" ]; then
DEFAULT_BOOT=$($GRUB_ONCE --show-mapped "$SAVED")
fi
fi
;;
linux*noresume*|module*xen*noresume*)
echo " Skipping ${MENU_ENTRIES[$I]}, because it has the noresume option" >&2
;;
linux*root=*|module*xen*root=*)
local ROOT
ROOT=${LINE#*root=}
DUMMY=($ROOT)
ROOT=${DUMMY[0]}
if [ x"${ROOT:0:5}" = "xUUID=" ]; then
UUID=${ROOT#UUID=}
if [ -n "$UUID" ]; then
ROOT=$($BLKID -U $UUID || true)
if [ -z "$ROOT" ]; then
echo " Skipping ${MENU_ENTRIES[$I]}, because its root device $UUID is not found" >&2
continue
fi
fi
fi
if [ "$(stat -Lc '%t:%T' $ROOT || true)" != "$(stat -Lc '%t:%T' $ROOTDEV || true)" ]; then
if compare-fsuuid "$ROOT" "$ROOTDEV" ; then
echo " $ROOTDEV and $ROOT have the same filesystem UUID"
else
echo " Skipping ${MENU_ENTRIES[$I]}, because its root= parameter ($ROOT)" >&2
echo " does not match the current root device ($ROOTDEV)." >&2
continue
fi
fi
DUMMY=($LINE) # kernel (hd0,1)/boot/vmlinuz-ABC root=/dev/hda2
KERNELS[$I]=${DUMMY[1]##*/} # vmlinuz-ABC
# DEBUG "Found kernel entry #${I}: '${DUMMY[1]##*/}'" INFO
let ++I
;;
linux*|module*xen*)
# a kernel without "root="? We better skip that one...
echo " Skipping ${MENU_ENTRIES[$I]}, because it has no root= option" >&2
;;
*) ;;
esac
done < "$GRUB_CONF"
}
#############################################################
# restore grub default after (eventually failed) resume
grub-once-restore()
{
echo "INFO: Running grub-once-restore .."
check-system
$GRUB_EDITENV $GRUB_ENV unset next_entry
echo "INFO: Done."
}
#############################################################################
# try to find a kernel image that matches the actually running kernel.
# We need this, if more than one kernel is installed. This works reasonably
# well with grub, if all kernels are named "vmlinuz-`uname -r`" and are
# located in /boot. If they are not, good luck ;-)
# for 2021-style usrmerged kernels, the location in /usr/lib/modules/ \
# `uname -r`/vmlinuz is resolved to match...
find-kernel-entry()
{
NEXT_BOOT=""
declare -i I=0
# DEBUG "running kernel: $RUNNING" DIAG
while [ -n "${KERNELS[$I]}" ]; do
BOOTING="${KERNELS[$I]}"
if IMAGE=$(readlink /boot/"$BOOTING"); then
if [[ $IMAGE == */vmlinuz ]]; then # new usrmerged setup
BOOTING=${IMAGE%/vmlinuz} # the directory name is what counts
BOOTING=${BOOTING##*/}
elif [ -e "/boot/${IMAGE##*/}" ]; then
# DEBUG "Found kernel symlink $BOOTING => $IMAGE" INFO
BOOTING=$IMAGE
fi
fi
BOOTING="${BOOTING#*${VMLINUZ}-}"
if [ "$RUNNING" == "$BOOTING" -a -n "${MENU_ENTRIES[$I]}" ]; then
NEXT_BOOT="${MENU_ENTRIES[$I]}"
echo " running kernel is grub menu entry $NEXT_BOOT (${KERNELS[$I]})"
break
fi
let ++I
done
# if we have not found a kernel, issue a warning.
# if we have found a kernel, we'll do "grub-once" later, after
# prepare_suspend finished.
if [ -z "$NEXT_BOOT" ]; then
echo "WARNING: no kernelfile matching the running kernel found"
fi
}
#############################################################################
# if we did not find a kernel (or BOOT_LOADER is not GRUB) check,
# if the running kernel is still the one that will (probably) be booted for
# resume (default entry in menu.lst or, if there is none, the kernel file
# /boot/${VMLINUZ} points to.)
# This will only work, if you use "original" SUSE kernels.
# you can always override with the config variable set to "yes"
prepare-grub()
{
echo "INFO: Running prepare-grub .."
check-system
get-kernels
RUNNING=`uname -r`
find-kernel-entry
if [ -z "$NEXT_BOOT" ]; then
# which kernel is booted with the default entry?
BOOTING="${KERNELS[$DEFAULT_BOOT]}"
# if there is no default entry (no menu.lst?) we fall back to
# the default of /boot/${VMLINUZ}.
[ -z "$BOOTING" ] && BOOTING="${VMLINUZ}"
if IMAGE=$(readlink /boot/"$BOOTING"); then
if [[ $IMAGE == */vmlinuz ]]; then # new usrmerged setup
BOOTING=${IMAGE%/vmlinuz} # the directory name is what counts
BOOTING=${BOOTING##*/}
elif [ -e "/boot/${IMAGE##*/}" ]; then
BOOTING=$IMAGE
fi
fi
BOOTING="${BOOTING#*${VMLINUZ}-}"
echo "running kernel: '$RUNNING', probably booting kernel: '$BOOTING'"
check-setup "$RUNNING"
if [ "$BOOTING" != "$RUNNING" ]; then
error_quit "ERROR: kernel version mismatch, cannot suspend to disk"
fi
else
# set the bootloader to the running kernel
echo " preparing boot-loader: selecting entry $NEXT_BOOT, kernel /boot/$BOOTING"
T1=`date +"%s%N"`
sync; sync; sync # this is needed to speed up grub-once on reiserfs
T2=`date +"%s%N"`
check-setup "$RUNNING"
echo " running $GRUB_ONCE \"${NEXT_BOOT}\""
${GRUB_ONCE} "$NEXT_BOOT"
T3=`date +"%s%N"`
S=$(((T2-T1)/100000000)); S="$((S/10)).${S:0-1}"
G=$(((T3-T2)/100000000)); G="$((G/10)).${G:0-1}"
echo " time needed for sync: $S seconds, time needed for grub: $G seconds."
fi
echo "INFO: Done."
}
#############################################################################
check-setup()
{
local WANT="$VMLINUZ-$1"
[ -n "$GRUB_SETUP" ] || return 0
# implementation below is s390x-only (for now)
echo "INFO: check-setup \"$WANT\" .."
HAVE="/boot/zipl/$VMLINUZ"
[ -r "$HAVE" ] ||
error_quit "ERROR: no zipl kernel, cannot suspend to disk"
HAVE=$(readlink $HAVE) ||
error_quit "ERROR: zipl kernel no sym-link, cannot suspend to disk"
[ "$HAVE" != "$WANT" ] ||
{ echo " zipl kernel already in sync, nothing to do"; return; }
echo " running $GRUB_SETUP # (incl. dracut!)" # no --image as running is preferred!
${GRUB_SETUP} > /dev/null 2>&1
}
###### main()
eval `grep LOADER_TYPE= /etc/sysconfig/bootloader`
if [ x"$LOADER_TYPE" != "xgrub2" -a x"$LOADER_TYPE" != "xgrub2-efi" ]; then
echo "INFO: Skip running $0 for bootloader: $LOADER_TYPE"
exit 0
fi
if [ "$2" = suspend ]; then
echo "INFO: Skip running $0 for $2"
exit 0
else
echo "INFO: running $0 for $2"
fi
if [ "$1" = pre ] ; then
prepare-grub
fi
if [ "$1" = post ] ; then
grub-once-restore
fi
