#!/bin/bash
# Filename:      grml-live
# Purpose:       build process script for generating a (grml based) Linux Live-ISO
# Authors:       grml-team (grml.org), (c) Michael Prokop <mika@grml.org>
# Bug-Reports:   see http://grml.org/bugs/
# License:       This file is licensed under the GPL v2 or any later version.
# Latest change: Fri Feb 15 14:28:37 CET 2008 [mika]
################################################################################

# read configuration files, set some misc variables {{{

export LANG=C
export LC_ALL=C

# exit on any error:
set -e

GRML_LIVE_VERSION='0.4'
CMDLINE="$0 $@"
ISO_DATE="$(date +%Y-%m-%d)"

# we need root permissions for the build-process:
if [ "$(id -u 2>/dev/null)" != 0 ] ; then
   echo "Error: please run this script with uid 0 (root)." >&2
   exit 1
fi

if [ -r /var/run/fai/FAI_INSTALLATION_IN_PROGRESS ] ; then
   echo "/usr/sbin/fai already running or was aborted before.">&2
   echo "You may remove /var/run/fai/FAI_INSTALLATION_IN_PROGRESS and try again.">&2
   exit 1
fi

# see #449236
if [ -r /var/run/fai/fai_softupdate_is_running ] ; then
   echo "/usr/sbin/fai softupdate already running or was aborted before.">&2
   echo "You may remove /var/run/fai/fai_softupdate_is_running and try again.">&2
   exit 1
fi

# make sure they are not set by default
VERBOSE=''
FORCE=''
UPDATE=''
BUILD_ONLY=''
HOSTNAME=''

if [ -r /etc/grml/lsb-functions ] ; then
   . /etc/grml/lsb-functions
else
   einfo()  { echo "  [*] $*" ;}
   eerror() { echo "  [!] $*">&2 ;}
   ewarn()  { echo "  [x] $*" ;}
   eend()   { return 0 ;}
fi

# source main configuration file:
LIVE_CONF=/etc/grml/grml-live.conf
. $LIVE_CONF

PN=$(basename $0)
# }}}

# clean exit {{{
bailout() {
  [ -n "$MIRROR_DIRECTORY" ] && umount "${CHROOT_OUTPUT}/${MIRROR_DIRECTORY}"
  rm -f /var/run/fai/fai_softupdate_is_running \
        /var/run/fai/FAI_INSTALLATION_IN_PROGRESS
  [ -n "$1" ] && EXIT="$1" || EXIT="1"
  [ -n "$2" ] && eerror "$2">&2
  log "------------------------------------------------------------------------------"
  exit "$EXIT"
}
# trap bailout 1 2 3 6 9 14 15
trap bailout 1 2 3 15
# }}}

# check for important variables {{{
[ -n "$GRML_FAI_CONFIG" ] || GRML_FAI_CONFIG=/etc/grml/fai
[ -n "$HOSTNAME" ] || HOSTNAME=grml
[ -n "$USERNAME" ] || USERNAME=grml
[ -n "$CLASSES" ]  || CLASSES="GRML,I386"
[ -n "$BOOT_METHOD" ] || BOOT_METHOD='isolinux'
[ -n "$OUTPUT" ] || bailout 1 "${PN}: \$OUTPUT not specified. Please adjust $LIVE_CONF. Exiting."

[ -n "$VERSION" ]  || VERSION="0.0.1"
[ -n "$RELEASENAME" ] || RELEASENAME="grml-live rocks"
[ -n "$GRML_NAME" ] || GRML_NAME='grml'

# logfile:
if [ -z "$LOGFILE" ] ; then
   LOGFILE=/var/log/grml-live.log
fi
touch $LOGFILE
chown root:adm $LOGFILE
chmod 664 $LOGFILE

NFSROOT_CONF=/etc/grml/fai/make-fai-nfsroot.conf

# }}}

# some important functions {{{

# log output:
# usage: log "string to log"
log() { echo "$*" >> $LOGFILE ; }

# cut string at character number int = $1
# usage: cut_string 5 "1234567890" will output "12345"
cut_string() {
  [ -n "$2" ] || return 1
  echo "$2" | head -c "$1"; echo -ne "\n"
}

# prepend int = $1 spaces before string = $2
# usage: extend_string_begin 5 "123" will output "  123"
extend_string_begin() {
  [ -n "$2" ] || return 1
  local COUNT="$(echo $2 | wc -c)"
  local FILL="$(expr $COUNT - $1)"
  while [ "$FILL" -gt 1 ] ; do
    echo -n " "
    local FILL=$(expr $FILL - 1)
  done
  while [ "$FILL" -lt 1 ] ; do
    echo -n " "
    local FILL=$(expr $FILL + 1)
  done
  echo "$2" | head -c "$1"; echo -ne "\n"
}

# append int = $1 spaces to string = $2
# usage: extend_string_begin 5 "123" will output "123  "
extend_string_end() {
  [ -n "$2" ] || return 1
  echo -n "$2" | head -c "$1"
  local COUNT="$(echo $2 | wc -c)"
  local FILL="$(expr $COUNT - $1)"
  while [ "$FILL" -gt 1 ] ; do
    echo -n " "
    local FILL=$(expr $FILL - 1)
  done
  while [ "$FILL" -lt 1 ] ; do
    echo -n " "
    local FILL=$(expr $FILL + 1)
  done
  echo -ne "\n"
}
# }}}

# usage information {{{
usage()
{
  echo "
$PN - build process script for generating a (grml based) Linux Live-ISO

Usage: $PN [-a <architecture>] [-c <classe[s]>] [-g <grml_name>] \\
                 [-i <iso_name> ] [-o <output_directory>] [-s <suite>] \\
                 [-t <template_directory>] [-s <suite>] \\
                 [-v <version_number>] [-bFVhu]

Usage examples:

    $PN
    $PN -c GRMLBASE,GRML_SMALL,I386 -o /grml/
    $PN -c GRMLBASE,GRML_MEDIUM,I386 -o /dev/shm/grml
    $PN -c GRMLBASE,GRML_SMALL,I386 -g grml-small -v 1.0
    $PN -c GRMLBASE,GRML_FULL,I386 -i grml_0.0-1.iso -v 0.0-1
    $PN -c GRMLBASE,GRML_FULL,I386 -s sid -V -r 'grml-live rocks'

More details: man grml-live
              /usr/share/doc/grml-live/grml-live.html

Please send your bug reports, feedback,.. to the grml-team.
http://grml.org/bugs/
"
}
# }}}

# read local (non-packaged) configuration {{{
LOCAL_CONFIG=/etc/grml/grml-live.local
if [ -r "$LOCAL_CONFIG" ] ; then
   log "Sourcing $LOCAL_CONFIG"
   . $LOCAL_CONFIG
else
   log "No $LOCAL_CONFIG found, not sourcing it"
   LOCAL_CONFIG=''
fi
# }}}

# command line parsing {{{
while getopts "a:C:c:g:i:o:r:s:t:v:bFhuVz" opt; do
  case "$opt" in
    a) ARCH="$OPTARG" ;;
    b) BUILD_ONLY=1 ;;
    c) CLASSES="$OPTARG" ;;
    C) CONFIG="$OPTARG" ;;
    g) GRML_NAME="$OPTARG" ;;
    i) ISO_NAME="$OPTARG" ;;
    o) OUTPUT="$OPTARG"
       CHROOT_OUTPUT="$OUTPUT/grml_chroot"
       BUILD_OUTPUT="$OUTPUT/grml_cd"
       ISO_OUTPUT="$OUTPUT/grml_isos"
       ;;
    r) RELEASENAME="$OPTARG" ;;
    s) SUITE="$OPTARG" ;;
    t) TEMPLATE_DIRECTORY="$OPTARG";;
    v) VERSION="$OPTARG" ;;
    F) FORCE=1 ;;
    h) usage ; bailout 0 ;;
    u) UPDATE=1 ;;
    V) VERBOSE="-v" ;;
    z) SQUASHFS_ZLIB="-nolzma" ;;
    ?) echo "invalid option -$OPTARG" >&2; bailout 1 ;;
  esac
done
shift $(($OPTIND - 1))  # set ARGV to the first not parsed commandline parameter
# }}}

# some misc checks before executing FAI {{{
[ -n "$CLASSES" ] || bailout 1 "Error: \$CLASSES unset, please set it in $LIVE_CONF or
specify it on the command line using the -c option."
[ -n "$OUTPUT" ] || bailout 1 "Error: \$OUTPUT unset, please set it in $LIVE_CONF or
specify it on the command line using the -o option."
# }}}

# clean/zero grml-live logfile {{{
if [ -n "$ZERO_LOGFILE" ] ; then
   echo -n > $LOGFILE
fi
# }}}

# clean/zero/remove old FAI directory {{{
if [ -n "$ZERO_FAI_LOGFILE" ] ; then
   if [ -d /var/log/fai/"$HOSTNAME" ] ; then
      rm -rf /var/log/fai/"$HOSTNAME"/"$(readlink /var/log/fai/"$HOSTNAME"/last)"
      rm -rf /var/log/fai/"$HOSTNAME"/"$(readlink /var/log/fai/"$HOSTNAME"/last-dirinstall)"
      rm -rf /var/log/fai/"$HOSTNAME"/"$(readlink /var/log/fai/"$HOSTNAME"/last-softupdate)"
      rm -f /var/log/fai/"$HOSTNAME"/last \
            /var/log/fai/"$HOSTNAME"/last-dirinstall \
            /var/log/fai/"$HOSTNAME"/last-softupdate
   fi
fi
# }}}

# ask user whether the setup is ok {{{
if [ -z "$FORCE" ] ; then
   echo
   echo "${PN} [${GRML_LIVE_VERSION}]: check your configuration (or use -F to force execution):"
   echo
   echo "  FAI classes:       $CLASSES"
   [ -r "$LOCAL_CONFIG" ]  && echo "  local config:      /etc/grml/grml-live.local"
   [ -n "$CONFIG" ]        && echo "  configuration:     $CONFIG"
   echo "  main directory:    $OUTPUT"
   [ -n "$CHROOT_OUTPUT" ] && echo "  chroot target:     $CHROOT_OUTPUT"
   [ -n "$BUILD_OUTPUT" ]  && echo "  build target:      $BUILD_OUTPUT"
   [ -n "$ISO_OUTPUT" ]    && echo "  ISO target:        $ISO_OUTPUT"
   [ -n "$GRML_NAME" ]     && echo "  grml name:         $GRML_NAME"
   [ -n "$RELEASENAME" ]   && echo "  release name:      $RELEASENAME"
   [ -n "$VERSION" ]       && echo "  grml version:      $VERSION"
   [ -n "$SUITE" ]         && echo "  Debian suite:      $SUITE"
   [ -n "$ARCH" ]          && echo "  Architecture:      $ARCH"
   [ -n "$BOOT_METHOD" ]   && echo "  Boot method:       $BOOT_METHOD"
   [ -n "$TEMPLATE_DIRECTORY" ] && echo "  Template files:    $TEMPLATE_DIRECTORY"
   [ -n "$FAI_ARGS" ]      && echo "  additional arguments for FAI: $FAI_ARGS"
   [ -n "$LOGFILE" ]       && echo "  Logging to file:   $LOGFILE"
   [ -n "$VERBOSE" ]       && echo "  Using VERBOSE mode."
   [ -n "$SQUASHFS_ZLIB" ] && echo "  Using ZLIB (instead of LZMA) compression."
   [ -n "$UPDATE" ]        && echo "  Executing UPDATE instead of fresh installation."
   [ -n "$BUILD_ONLY" ]    && echo "  Executing BUILD_ONLY instead of fresh installation or UPDATE."
   echo
   echo -n "Is this ok for you? [y/N] "
   read a
   if ! [ "$a" = 'y' -o "$a" = 'Y' ] ; then
      bailout 1 "Exiting as requested."
   fi
   echo
fi

if [ -n "$CONFIG" ] ; then
   if ! [ -f "$CONFIG" ] ; then
      log "Sorry, $CONFIG could not be read. Exiting. [$(date)]"
      eerror "Sorry, $CONFIG could not be read. Exiting."
      bailout 1
   else
      log "Sourcing $CONFIG"
      . $CONFIG
   fi
fi

start_seconds=$(cut -d . -f 1 /proc/uptime)
log "------------------------------------------------------------------------------"
log "Starting grml-live [${GRML_LIVE_VERSION}] run on $(date)"
log "Executed grml-live command line:"
log "$CMDLINE"

einfo "Logging actions to logfile $LOGFILE"
# }}}

# on-the-fly configuration {{{
if [ -n "$MIRROR_DIRECTORY" ] ; then
   if ! [ -d "$MIRROR_DIRECTORY/debian" ] ; then
      log "Sorry, $MIRROR_DIRECTORY/debian does not seem to exist. Exiting. [$(date)]"
      eerror "Sorry, $MIRROR_DIRECTORY/debian does not seem to exist. Exiting."
      bailout 1
   fi
   echo "$MIRROR_SOURCES" > /etc/grml/fai/apt/sources.list
   if [ -n "$GRML_LIVE_SOURCES" ] ; then
      echo "$GRML_LIVE_SOURCES" >> /etc/grml/fai/apt/sources.list
   fi
elif [ -n "$GRML_LIVE_SOURCES" ] ; then
   echo "$GRML_LIVE_SOURCES" > /etc/grml/fai/apt/sources.list
fi

if [ -n "$FAI_DEBOOTSTRAP" ] ; then
   sed -i "s#^FAI_DEBOOTSTRAP=.*#FAI_DEBOOTSTRAP=\"$FAI_DEBOOTSTRAP\"#" $NFSROOT_CONF
fi

# does this suck? YES!
if [ -n "$SUITE" ] ; then

   for file in "$LIVE_CONF" "$CONFIG" "$LOCAL_CONFIG" ; do
       if [ -n "$file" ] ; then
          sed -i "s/SUITE=.*/SUITE=\"$SUITE\"/" $LIVE_CONF
          DIST="\|\ etch\ \|\ stable\ \|\ lenny\ \|\ testing\ \|\ sid\ \|\ unstable\ "
          sed -i "s/\(deb .\+\)\([ \t]+\)$DIST\([ \t]+\)\(main \)/\1\2 $SUITE \3\4/" $file
       fi
   done

   sed -i "s/\(deb .\+\)\([ \t]+\)$DIST\([ \t]+\)\(main \)/\1\2 $SUITE \3\4/" /etc/grml/fai/apt/sources.list
   # notice: activate grml-live pool only if we are building against unstable:
   if grep -qe unstable -qe sid /etc/grml/fai/apt/sources.list ; then
      grep -q 'grml-live.*main' /etc/grml/fai/apt/sources.list || \
      grep grml-stable /etc/grml/fai/apt/sources.list | \
           sed 's/grml-stable/grml-live/' >> /etc/grml/fai/apt/sources.list
   else
      grep -q 'grml-live.*main' /etc/grml/fai/apt/sources.list && \
      sed -i 's/.*grml-live.*/# removed grml-live repository/' /etc/grml/fai/apt/sources.list
   fi

   for file in "$LIVE_CONF" "$CONFIG" "$LOCAL_CONFIG" ; do
       if [ -n "$file" ] ; then
          sed -i "s|FAI_DEBOOTSTRAP=\"[a-z]* |FAI_DEBOOTSTRAP=\"$SUITE |" "$file"
       fi
   done
   sed -i "s|FAI_DEBOOTSTRAP=\"[a-z]* |FAI_DEBOOTSTRAP=\"$SUITE |" $NFSROOT_CONF
fi

# set $ARCH
[ -n "$ARCH" ] || ARCH="$(dpkg --print-architecture)"
if grep -q -- 'FAI_DEBOOTSTRAP_OPTS.*--arch' $NFSROOT_CONF ; then
   sed -i "s/--arch [a-z0-9]* /--arch $ARCH /" $NFSROOT_CONF
else
   sed -i "s|FAI_DEBOOTSTRAP_OPTS=\"\(.*\)|FAI_DEBOOTSTRAP_OPTS=\"--arch $ARCH \1|" $NFSROOT_CONF
fi
# }}}

# CHROOT_OUTPUT - execute FAI {{{
[ -n "$CHROOT_OUTPUT" ] || CHROOT_OUTPUT="$OUTPUT/grml_chroot"

if [ -n "$UPDATE" -o -n "$BUILD_ONLY" ] ; then
   FAI_ACTION=softupdate
else
   FAI_ACTION=dirinstall
fi

if [ -n "$UPDATE" -o -n "$BUILD_ONLY" ] ; then
   if ! [ -r "$CHROOT_OUTPUT/etc/grml_version" ] ; then
      log "Error: does not look like you have a working chroot. Updating/building not possible."
      eerror "Error: does not look like you have a working chroot. Updating/building not possible. (Drop -u/-b option?)"
      eend 1
      bailout 20
   fi
fi

if [ -d "$CHROOT_OUTPUT/bin" -a -z "$UPDATE" -a -z "$BUILD_ONLY" ] ; then
   log "$CHROOT_OUTPUT exists already, skipping stage 'fai dirinstall'"
   ewarn "$CHROOT_OUTPUT exists already, skipping stage 'fai dirinstall'" ; eend 0
else
   mkdir -p "$CHROOT_OUTPUT" || bailout 5 "Problem with creating $CHROOT_OUTPUT for FAI"

   if [ -n "${MIRROR_DIRECTORY}" ] ; then
      mkdir -p "${CHROOT_OUTPUT}/${MIRROR_DIRECTORY}"
      mount --bind "${MIRROR_DIRECTORY}" "${CHROOT_OUTPUT}/${MIRROR_DIRECTORY}"
   fi

   log "Executed FAI command line:"
   log "BUILD_ONLY=$BUILD_ONLY fai $VERBOSE -C $GRML_FAI_CONFIG -c$CLASSES -u $HOSTNAME $FAI_ACTION $CHROOT_OUTPUT $FAI_ARGS"
   BUILD_ONLY="$BUILD_ONLY" fai $VERBOSE -C "$GRML_FAI_CONFIG" -c"$CLASSES" -u "$HOSTNAME" $FAI_ACTION "$CHROOT_OUTPUT" $FAI_ARGS | tee -a $LOGFILE

   log "Setting /etc/grml_version to $GRML_NAME $VERSION Release Codename $RELEASENAME [$ISO_DATE]"
   echo "$GRML_NAME $VERSION Release Codename $RELEASENAME [$ISO_DATE]" > $CHROOT_OUTPUT/etc/grml_version
   chmod 644 $CHROOT_OUTPUT/etc/grml_version

   # Remove all FAI logs from chroot if class RELEASE is used:
   if [ -f "$CHROOT_OUTPUT"/etc/grml_fai_release ] ; then
      rm -rf "$CHROOT_OUTPUT"/var/log/fai/*
   fi

   umount $CHROOT_OUTPUT/proc 2>/dev/null || /bin/true
   umount $CHROOT_OUTPUT/sys  2>/dev/null || /bin/true
   [ -n "$MIRROR_DIRECTORY" ] && umount "${CHROOT_OUTPUT}/${MIRROR_DIRECTORY}"

   # notice: 'fai dirinstall' does not seem to exit appropriate, so:
   ERROR=''
   CHECKLOG=/var/log/fai/$HOSTNAME/last
   if [ -r "$CHECKLOG/software.log" ] ; then
      # 1 errors during executing of commands
      # Unable to write mmap - msync (28 No space left on device)
      # 'No candidate version found for' [/var/log/fai/current/software.log]
      grep 'dpkg: error processing' $CHECKLOG/software.log >> $LOGFILE && ERROR=1
      grep 'E: Method http has died unexpectedly!' $CHECKLOG/software.log >> $LOGFILE && ERROR=2
      grep 'ERROR: chroot' $CHECKLOG/software.log >> $LOGFILE && ERROR=3
   fi

   if [ -r "$CHECKLOG/shell.log" ] ; then
      grep 'FAILED with exit code' $CHECKLOG/shell.log >> $LOGFILE && ERROR=2
   fi

   if [ -n "$ERROR" ] ; then
      log "There was an error [${ERROR}] during execution of stage 'fai dirinstall' [$(date)]"
      eerror "There was an error during execution of stage 'fai dirinstall'"
      echo "   Check out $CHECKLOG for details. [exit ${ERROR}]"
      eend 1
      bailout 1
   else
      log "Finished execution of stage 'fai dirinstall' [$(date)]"
      einfo "Finished execution of stage 'fai dirinstall'"
   fi
fi
# }}}

# BUILD_OUTPUT - execute arch specific stuff and squashfs {{{
[ -n "$BUILD_OUTPUT" ] || BUILD_OUTPUT="$OUTPUT/grml_cd"
mkdir -p "$BUILD_OUTPUT" || bailout 6 "Problem with creating $BUILD_OUTPUT for stage ARCH"

# i386:
if [ "$ARCH" = i386 ] || [ "$ARCH" = amd64 ] ; then
   if [ -d "$BUILD_OUTPUT"/boot -a -z "$UPDATE" -a -z "$BUILD_ONLY" ] ; then
      log "$BUILD_OUTPUT/boot exists already, skipping stage 'boot'"
      ewarn "$BUILD_OUTPUT/boot exists already, skipping stage 'boot'" ; eend 0
   else
      # booting stuff:
      [ -d "$BUILD_OUTPUT"/boot/addons   ] || mkdir -p "$BUILD_OUTPUT"/boot/addons
      [ -d "$BUILD_OUTPUT"/boot/isolinux ] || mkdir -p "$BUILD_OUTPUT"/boot/isolinux
      [ -d "$BUILD_OUTPUT"/boot/"${GRML_NAME}" ] || mkdir -p "$BUILD_OUTPUT"/boot/"${GRML_NAME}"

      cp /boot/memtest86+.bin "$BUILD_OUTPUT"/boot/addons/memtest

      # if we don't have an initrd we a) can't boot and b) there was an error
      # during build, so check for the file:
      INITRD="$(ls $CHROOT_OUTPUT/boot/initrd* 2>/dev/null| grep -v '.bak$' | sort -r | head -1)"
      if [ -n "$INITRD" ] ; then
         cp $INITRD "$BUILD_OUTPUT"/boot/"${GRML_NAME}"/initrd.gz
         find $CHROOT_OUTPUT/boot/ -name initrd\*.bak -exec rm {} \;
      else
         log "No initrd found inside $CHROOT_OUTPUT/boot/ - Exiting"
         eerror "No initrd found inside $CHROOT_OUTPUT/boot/ - Exiting" ; eend 1
         bailout 10
      fi

      KERNEL_IMAGE="$(ls $CHROOT_OUTPUT/boot/vmlinuz* 2>/dev/null | sort -r | head -1)"
      if [ -n "$KERNEL_IMAGE" ] ; then
         cp "$KERNEL_IMAGE" "$BUILD_OUTPUT"/boot/"${GRML_NAME}"/linux26
      else
         log "No kernel found inside $CHROOT_OUTPUT/boot/ - Exiting"
         eerror "No kernel found inside $CHROOT_OUTPUT/boot/ - Exiting" ; eend 1
         bailout 11
      fi

      [ -n "$TEMPLATE_DIRECTORY" ] || TEMPLATE_DIRECTORY='/usr/share/grml-live/templates'
      if ! [ -d "${TEMPLATE_DIRECTORY}"/boot ] ; then
         log "${TEMPLATE_DIRECTORY}/boot does not exist. Exiting."
         eerror "${TEMPLATE_DIRECTORY}/boot does not exist. Exiting." ; eend 1
         bailout 8
      fi

      cp ${TEMPLATE_DIRECTORY}/boot/isolinux/*  "$BUILD_OUTPUT"/boot/isolinux/
      cp ${TEMPLATE_DIRECTORY}/boot/addons/*    "$BUILD_OUTPUT"/boot/addons/

      if ! [ -d "${BUILD_OUTPUT}/boot/grub" ] ; then
         cp -a ${TEMPLATE_DIRECTORY}/boot/grub  "$BUILD_OUTPUT"/boot/
      fi

      if ! [ -d "${TEMPLATE_DIRECTORY}"/GRML ] ; then
         log "${TEMPLATE_DIRECTORY}/GRML does not exist. Exiting."
         eerror "${TEMPLATE_DIRECTORY}/GRML does not exist. Exiting." ; eend 1
         bailout 9
      fi

      [ -d "$BUILD_OUTPUT"/GRML ] || mkdir "$BUILD_OUTPUT"/GRML
      cp -a ${TEMPLATE_DIRECTORY}/GRML/* "$BUILD_OUTPUT"/GRML/

      # adjust boot splash information:
      RELEASE_INFO="$GRML_NAME $VERSION - Release Codename $RELEASENAME"
      RELEASE_INFO="$(cut_string 68 "$RELEASE_INFO")"
      RELEASE_INFO="$(extend_string_end 68 "$RELEASE_INFO")"

      sed -i "s/%RELEASE_INFO%/$GRML_NAME $VERSION - $RELEASENAME/" "$BUILD_OUTPUT"/GRML/grml-version
      sed -i "s/%DATE%/$ISO_DATE/"             "$BUILD_OUTPUT"/GRML/grml-version

      sed -i "s/%RELEASE_INFO%/$RELEASE_INFO/" "$BUILD_OUTPUT"/boot/isolinux/boot.msg
      sed -i "s/%DATE%/$ISO_DATE/"             "$BUILD_OUTPUT"/boot/isolinux/boot.msg

      sed -i "s/%RELEASE_INFO%/$RELEASE_INFO/" "$BUILD_OUTPUT"/boot/isolinux/boot-beep.msg
      sed -i "s/%DATE%/$ISO_DATE/"             "$BUILD_OUTPUT"/boot/isolinux/boot-beep.msg

      sed -i "s/%VERSION%/$VERSION/"           "$BUILD_OUTPUT"/boot/grub/menu.lst
      sed -i "s/%GRML_NAME%/$GRML_NAME/"       "$BUILD_OUTPUT"/boot/grub/menu.lst

      # autostart for Windows:
      if [ -d "${TEMPLATE_DIRECTORY}/windows/autostart/" ] ; then
         cp ${TEMPLATE_DIRECTORY}/windows/autostart/* "$BUILD_OUTPUT"/
      fi

      # windows-binaries:
      if [ -n "$WINDOWS_BINARIES" ] ; then
         if [ -f "$BUILD_OUTPUT"/windows/putty.exe ] ; then
            log "$BUILD_OUTPUT/windows exists already, skipping stage 'WINDOWS_BINARIES'"
            ewarn "$BUILD_OUTPUT/windows exists already, skipping stage 'WINDOWS_BINARIES'" ; eend 0
         else
            if ! [ -d "$BUILD_OUTPUT"/windows ] ; then
               mkdir "$BUILD_OUTPUT"/windows
               ( cd "$BUILD_OUTPUT"/windows
                 for file in pageant plink pscp psftp putty puttygen ; do
                    wget -O ${file}.exe ${WINDOWS_BINARIES}/${file}.exe
                    md5sum ${file}.exe > ${file}.exe.md5
                 done )
            fi
         fi
      log "Finished execution of stage 'WINDOWS_BINARIES' [$(date)]"
      einfo "Finished execution of stage 'WINDOWS_BINARIES'" ; eend 0
      fi
   einfo "Finished execution of stage 'boot'" ; eend 0
   fi
# ppc:
elif [ "$ARCH" = powerpc ] ; then
    ewarn 'Warning: formorer, it is your turn. :)'>&2
# unsuported:
else
   eerror 'Error: Unsupported ARCH, sorry. Want to support it? Contribute!' ; eend 1
fi

if [ -f "$BUILD_OUTPUT"/live/grml.squashfs -a -z "$UPDATE" -a -z "$BUILD_ONLY" ] ; then
   log "$BUILD_OUTPUT/live exists already, skipping stage 'squashfs'"
   ewarn "$BUILD_OUTPUT/live exists already, skipping stage 'squashfs'" ; eend 0
else
   [ -d "$BUILD_OUTPUT"/live ] || mkdir "$BUILD_OUTPUT"/live
   # make sure we don't leave (even an empty) base.tgz:
   [ -f "$CHROOT_OUTPUT/base.tgz" ] && rm -f "$CHROOT_OUTPUT/base.tgz"

   # execute squashfs:
   if mksquashfs --help 2>&1 | grep -q -- -no-progress ; then
      log "mksquashfs $CHROOT_OUTPUT/* $BUILD_OUTPUT/live/grml.squashfs -noappend -no-progress"
      mksquashfs $CHROOT_OUTPUT/* $BUILD_OUTPUT/live/"${GRML_NAME}".squashfs -noappend -no-progress $SQUASHFS_OPTIONS $SQUASHFS_ZLIB
   else
      log "mksquashfs $CHROOT_OUTPUT/* $BUILD_OUTPUT/live/grml.squashfs -noappend"
      mksquashfs $CHROOT_OUTPUT/* $BUILD_OUTPUT/live/"${GRML_NAME}".squashfs -noappend $SQUASHFS_OPTIONS $SQUASHFS_ZLIB
   fi
   log "Finished execution of stage 'squashfs' [$(date)]"
   einfo "Finished execution of stage 'squashfs'" ; eend 0
fi

# create md5sum file:
( cd $BUILD_OUTPUT/GRML &&
find .. -type f -not -name md5sums -not -name isolinux.bin -exec md5sum {} \; > md5sums )
# }}}

# ISO_OUTPUT - mkisofs {{{
[ -n "$ISO_OUTPUT" ] || ISO_OUTPUT="$OUTPUT/grml_isos"
[ -n "$ISO_NAME" ] || ISO_NAME="${GRML_NAME}_${VERSION}.iso"

if [ "$BOOT_METHOD" = "isolinux" ] ; then
   BOOT_FILE="boot/isolinux/isolinux.bin -c boot/isolinux/boot.cat"
elif [ "$BOOT_METHOD" = "grub" ] ; then
   BOOT_FILE="boot/grub/stage2_eltorito"
fi

if [ -f "${ISO_OUTPUT}/${ISO_NAME}" -a -z "$UPDATE" -a -z "$BUILD_ONLY" ] ; then
   log "$ISO_OUTPUT exists already, skipping stage 'iso build'"
   ewarn "$ISO_OUTPUT exists already, skipping stage 'iso build'" ; eend 0
else
   mkdir -p "$ISO_OUTPUT" || bailout 6 "Problem with creating $ISO_OUTPUT for stage 'iso build'"

   CURRENT_DIR=$(pwd)
   if cd "$BUILD_OUTPUT" ; then
      log "mkisofs -V grml '$VERSION' -publisher 'grml-live | grml.org' -l -r -J -no-emul-boot -boot-load-size 4 -boot-info-table -b $BOOT_FILE -o ${ISO_OUTPUT}/${ISO_NAME} ."
      mkisofs -V "grml $VERSION" -publisher 'grml-live | grml.org' \
              -l -r -J -no-emul-boot -boot-load-size 4 -boot-info-table    \
              -b $BOOT_FILE \
              -o "${ISO_OUTPUT}/${ISO_NAME}" . ; RC=$?

      # generate md5sum of ISO if we are using class 'RELEASE':
      case $CLASSES in *RELEASE*)
         [ "$RC" = 0 ] && \
         ( cd $ISO_OUTPUT && \
         md5sum ${ISO_NAME} > ${ISO_NAME}.md5 && \
         touch -r ${ISO_NAME} ${ISO_NAME}.md5 )
         ;;
      esac

      cd $CURRENT_DIR
   fi

   if [ "$RC" = 0 ] ; then
      log "Finished execution of stage 'iso build' [$(date)]"
      einfo "Finished execution of stage 'iso build'" ; eend 0
   else
      log "There was an error ($RC) executing stage 'iso build' [$(date)]"
      eerror "There was an error executing stage 'iso build'" ; eend 1
      bailout $RC
   fi
fi
# }}}

# finalize {{{
[ -n "$start_seconds" ] && SECONDS="$[$(cut -d . -f 1 /proc/uptime)-$start_seconds]" || SECONDS="unknown"
einfo "Sucessfully finished execution of $PN [running ${SECONDS} seconds]" ; eend 0
log "Sucessfully finished execution of $PN [running ${SECONDS} seconds]"
bailout 0
# }}}

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