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|
# -*- sh -*-
# vim:ft=sh:ts=8:sw=4:noet
GRUB_MENU_FILE="/boot/grub/grub.cfg"
GRUB_MENU_DFLT_BACKUP_FILE="/var/backups/grub.cfg.hibernate"
AddConfigHandler GrubConfigOptions
AddConfigHelp "ChangeGrubMenu <boolean>" "Change grub's config file to show system is suspended before suspending and restore after resume."
AddConfigHelp "GrubMenuFile <filename>" "Filename of grub's config file. Default is ${GRUB_MENU_FILE}."
AddConfigHelp "AlternateGrubMenuFile <filename>" "Filename of the grub config file to put in place when the machine is suspended. If this is not specified, the script will add a small header to the existing grub menu."
AddConfigHelp "BackupGrubMenuFile <filename>" "Where to keep a backup of your real grub menu file. Defaults to ${GRUB_MENU_DFLT_BACKUP_FILE}."
AddOptionHandler GrubCmdlineOptions
AddShortOption 'g'
AddLongOption 'restore-grub'
AddOptionHelp '-g, --restore-grub' 'Restores the grub menu to normal (use if a resume was not completed successfully) and exits the script. A suspend is not performed.'
GRUB_BEGIN_SENTINEL="### BEGIN HIBERNATE SENTINEL"
GRUB_END_SENTINEL="### END HIBERNATE SENTINEL"
ChangeGrubMenu() {
if [ x"$CHANGE_GRUB_MENU" = "x1" ] ; then
if [ -f $GRUB_MENU_FILE ] ;then
# given file exists so change menu
vecho 2 "Changing grub menu..."
# Make a backup, and abort if we fail to.
if ! cp "$GRUB_MENU_FILE" "${BACKUP_GRUB_MENU_FILE:-$GRUB_MENU_DFLT_BACKUP_FILE}" ; then
vecho 0 "Could not make backup of grub menu. Not changing!"
return 1 # abort if not forced
fi
# If we have an alternate file, use that. Else alter the current one
if [ -n "$ALT_GRUB_MENU_FILE" ] ; then
if ! cp -f "$ALT_GRUB_MENU_FILE" "$GRUB_MENU_FILE" ; then
vecho 0 "Could not replace grub menu file with alternate."
return 1 # abort if not forced
fi
else
RestoreGrubMenu
cat <<-EOF >> $GRUB_MENU_FILE
$GRUB_BEGIN_SENTINEL
title _____________________________________________________________________
configfile dummy
title WARNING: `uname -s -r` is suspended via TuxOnIce!
configfile dummy
$GRUB_END_SENTINEL
EOF
fi
# Call sync to ensure it is written to disk (do we still need
# double/triple syncs?)
sync ; sync
else
CHANGE_GRUB_MENU=0
vecho 1 "Grub config file not found. Grub scriptlet disabled."
fi
fi
}
RestoreGrubMenu() {
if [ x"$CHANGE_GRUB_MENU" = "x1" ] ; then
if [ -z "$ALT_GRUB_MENU_FILE" ]; then
sed -e "/^$GRUB_BEGIN_SENTINEL/,/^$GRUB_END_SENTINEL/d" \
$GRUB_MENU_FILE > $GRUB_MENU_FILE.hibernate.new \
&& mv $GRUB_MENU_FILE.hibernate.new $GRUB_MENU_FILE
else
mv "${BACKUP_GRUB_MENU_FILE:-$GRUB_MENU_DFLT_BACKUP_FILE}" "$GRUB_MENU_FILE"
fi
fi
}
GrubConfigOptions() {
case $1 in
changegrubmenu)
BoolIsOn "$1" "$2" && CHANGE_GRUB_MENU=1 || return 0
;;
grubmenufile)
GRUB_MENU_FILE="$2"
return 0
;;
alternategrubmenufile)
if [ ! -r "$2" ] ; then
vecho 0 "AlternateGrubMenuFile $2 is not readable."
vecho 0 "This configuation option will be ignored."
return 0
fi
ALT_GRUB_MENU_FILE="$2"
return 0
;;
backupgrubmenufile)
BACKUP_GRUB_MENU_FILE="$2"
return 0
;;
*)
return 1
esac
if [ -z "$GRUB_HOOKED" ] ; then
AddSuspendHook 11 ChangeGrubMenu
AddResumeHook 11 RestoreGrubMenu
GRUB_HOOKED=1
fi
return 0
}
GrubCmdlineOptions() {
case $1 in
-g|--restore-grub)
AddSuspendHook 00 RestoreGrubStandalone
;;
*)
return 1
esac
return 0
}
RestoreGrubStandalone() {
# we want to restore always
CHANGE_GRUB_MENU=1
RestoreGrubMenu && vecho 0 "Grub menu restored." || vecho 0 "No grub menu found to restore."
# 3 to indicate hibernate to be silent on exiting
return 3
}
# $Id$
|
