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|_| |_|_(_)_/ \_\ |_| |_| |_| \_/ \__,_|\__\___| |_____/|_| |_|\___V 2.1
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# 940_grub_rescue.sh
# This file is part of Relax-and-Recover, licensed under the GNU General
# Public License. Refer to the included COPYING for full text of license.
### Add the rescue kernel and initrd to the local GRUB Legacy
###
# With EFI_STUB enabled there will be no Grub entry.
is_true "$EFI_STUB" && return 0
# Only do it when explicitly enabled:
is_true "$GRUB_RESCUE" || return 0
### Only do when system has GRUB Legacy
[[ $(type -p grub-probe) || $(type -p grub2-probe) ]] && return
grub_binary=$(get_path grub)
if [[ -z "$grub_binary" ]]; then
Log "Could not find grub (legacy) binary."
return
fi
# Use strings because "grub --version" would sync all disks
# cf. the get_version function in lib/layout-functions.sh
grub_version=$(strings $grub_binary | sed -rn 's/^[^0-9\.]*([0-9]+\.[-0-9a-z\.]+).*$/\1/p' | tail -n 1)
if version_newer "$grub_version" 1.0; then
# only for grub-legacy we make special ReaR boot entry in menu.lst
return
fi
test -r "$KERNEL_FILE" || Error "Failed to find kernel '$KERNEL_FILE', updating GRUB failed."
test -r "$TMP_DIR/$REAR_INITRD_FILENAME" || Error "Failed to find initrd '$REAR_INITRD_FILENAME', updating GRUB failed."
function total_filesize {
stat --format '%s' "$@" 2>/dev/null | awk 'BEGIN { t=0 } { t+=$1 } END { print t }'
}
available_space=$(df -Pkl /boot | awk 'END { print $4 * 1024 }')
used_space=$(total_filesize /boot/rear-kernel /boot/rear-$REAR_INITRD_FILENAME)
required_space=$(total_filesize $KERNEL_FILE $TMP_DIR/$REAR_INITRD_FILENAME)
if (( available_space + used_space < required_space )) ; then
required_MiB=$(( required_space / 1024 / 1024 ))
available_MiB=$(( ( available_space + used_space ) / 1024 / 1024 ))
Error "Not enough disk space available in /boot for GRUB rescue image. Required: $required_MiB MiB. Available: $available_MiB MiB."
fi
if is_true $USING_UEFI_BOOTLOADER ; then
# set to 1 means using UEFI
# SLES uses elilo instead of grub-efi; we will return if that is the case (and do not add a ReaR rescue entry)
[[ "${UEFI_BOOTLOADER##*/}" = "elilo.efi" ]] && return
grub_conf="`dirname $UEFI_BOOTLOADER`/grub.conf"
else
grub_conf=$(readlink -f /boot/grub/menu.lst)
fi
[[ -w "$grub_conf" ]]
StopIfError "GRUB configuration cannot be modified."
if [[ "${GRUB_RESCUE_PASSWORD:0:3}" == '$1$' ]]; then
GRUB_RESCUE_PASSWORD="--md5 $GRUB_RESCUE_PASSWORD"
fi
awk -f- $grub_conf >$TMP_DIR/menu.lst <<EOF
/^title Relax-and-Recover/ {
ISREAR=1
next
}
/^title / {
ISREAR=0
}
{
if (ISREAR) {
next
}
print
}
END {
print "title Relax-and-Recover"
print "\tpassword $GRUB_RESCUE_PASSWORD"
print "\tkernel /rear-kernel $KERNEL_CMDLINE"
print "\tinitrd /rear-$REAR_INITRD_FILENAME"
}
EOF
[[ -s $grub_conf ]]
BugIfError "Modified GRUB is empty !"
if ! diff -u $grub_conf $TMP_DIR/menu.lst >&2; then
LogPrint "Modifying local GRUB configuration"
cp -af $v $grub_conf $grub_conf.old >&2
cat $TMP_DIR/menu.lst >$grub_conf
fi
if [[ $(stat -L -c '%d' $KERNEL_FILE) == $(stat -L -c '%d' /boot/) ]]; then
# Hardlink file, if possible
cp -pLlf $v $KERNEL_FILE /boot/rear-kernel || BugError "Failed to hardlink '$KERNEL_FILE' to /boot/rear-kernel"
elif [[ $(stat -L -c '%s %Y' $KERNEL_FILE) == $(stat -L -c '%s %Y' /boot/rear-kernel 2>/dev/null) ]]; then
# If existing file has exact same size and modification time, assume the same
:
else
# In all other cases, replace
cp -pLf $v $KERNEL_FILE /boot/rear-kernel || BugError "Failed to copy '$KERNEL_FILE' to /boot/rear-kernel"
fi
cp -af $v $TMP_DIR/$REAR_INITRD_FILENAME /boot/rear-$REAR_INITRD_FILENAME || BugError "Failed to copy '$TMP_DIR/$REAR_INITRD_FILENAME' to '/boot/rear-$REAR_INITRD_FILENAME'"