#! /bin/sh
set -e

# grub-mkconfig helper script.
# Copyright (C) 2006,2007,2008,2009,2010  Free Software Foundation, Inc.
#
# GRUB is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# GRUB is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GRUB.  If not, see <http://www.gnu.org/licenses/>.

prefix="/usr"
exec_prefix="/usr"
datarootdir="/usr/share"

. "$pkgdatadir/grub-mkconfig_lib"

export TEXTDOMAIN=grub
export TEXTDOMAINDIR="${datarootdir}/locale"

CLASS="--class gnu-linux --class gnu --class os"

if [ "x${GRUB_DISTRIBUTOR}" = "x" ] ; then
  OS=Linux
else
  OS="${GRUB_DISTRIBUTOR} Linux"
  CLASS="--class $(echo ${GRUB_DISTRIBUTOR} | tr 'A-Z' 'a-z' | cut -d' ' -f1|LC_ALL=C sed 's,[^[:alnum:]_],_,g') ${CLASS}"
fi

# loop-AES arranges things so that /dev/loop/X can be our root device, but
# the initrds that Linux uses don't like that.
case ${GRUB_DEVICE} in
  /dev/loop/*|/dev/loop[0-9])
    GRUB_DEVICE=`losetup ${GRUB_DEVICE} | sed -e "s/^[^(]*(\([^)]\+\)).*/\1/"`
  ;;
esac

if [ "x${GRUB_CMDLINE_LINUX_RECOVERY}" = "x" ] ; then
  GRUB_CMDLINE_LINUX_RECOVERY=single
fi

# Default to disabling partition uuid support to maintian compatibility with
# older kernels.
GRUB_DISABLE_LINUX_PARTUUID=${GRUB_DISABLE_LINUX_PARTUUID-true}

# btrfs may reside on multiple devices. We cannot pass them as value of root= parameter
# and mounting btrfs requires user space scanning, so force UUID in this case.
if ( [ "x${GRUB_DEVICE_UUID}" = "x" ] && [ "x${GRUB_DEVICE_PARTUUID}" = "x" ] ) \
    || ( [ "x${GRUB_DISABLE_LINUX_UUID}" = "xtrue" ] \
	&& [ "x${GRUB_DISABLE_LINUX_PARTUUID}" = "xtrue" ] ) \
    || ( ! test -e "/dev/disk/by-uuid/${GRUB_DEVICE_UUID}" \
	&& ! test -e "/dev/disk/by-partuuid/${GRUB_DEVICE_PARTUUID}" ) \
    || ( test -e "${GRUB_DEVICE}" && uses_abstraction "${GRUB_DEVICE}" lvm ); then
  LINUX_ROOT_DEVICE=${GRUB_DEVICE}
elif [ "x${GRUB_DEVICE_UUID}" = "x" ] \
    || [ "x${GRUB_DISABLE_LINUX_UUID}" = "xtrue" ]; then
  LINUX_ROOT_DEVICE=PARTUUID=${GRUB_DEVICE_PARTUUID}
else
  LINUX_ROOT_DEVICE=UUID=${GRUB_DEVICE_UUID}
fi

case x"$GRUB_FS" in
    xbtrfs)
	rootsubvol="`make_system_path_relative_to_its_root /`"
	rootsubvol="${rootsubvol#/}"
	if [ "x${rootsubvol}" != x ]; then
	    GRUB_CMDLINE_LINUX="rootflags=subvol=${rootsubvol} ${GRUB_CMDLINE_LINUX}"
	fi;;
    xzfs)
	rpool=`${grub_probe} --device ${GRUB_DEVICE} --target=fs_label 2>/dev/null || true`
	bootfs="`make_system_path_relative_to_its_root / | sed -e "s,@$,,"`"
	LINUX_ROOT_DEVICE="ZFS=${rpool}${bootfs%/}"
	;;
esac

title_correction_code=

linux_entry ()
{
  os="$1"
  version="$2"
  type="$3"
  args="$4"

  if [ -z "$boot_device_id" ]; then
      boot_device_id="$(grub_get_device_id "${GRUB_DEVICE}")"
  fi
  if [ x$type != xsimple ] ; then
      case $type in
	  booster)
	      title="$(gettext_printf "%s, with Linux %s (booster initramfs)" "${os}" "${version}")" ;;
	  fallback)
	      title="$(gettext_printf "%s, with Linux %s (fallback initramfs)" "${os}" "${version}")" ;;
    snapshot)
        title="$(gettext_printf "%s, with Linux %s (snapshot) ${SNAPSHOTNAME}" "${os}" "${version}")" ;;
	  recovery)
	      title="$(gettext_printf "%s, with Linux %s (recovery mode)" "${os}" "${version}")" ;;
	  *)
	      title="$(gettext_printf "%s, with Linux %s" "${os}" "${version}")" ;;
      esac
      if [ x"$title" = x"$GRUB_ACTUAL_DEFAULT" ] || [ x"Previous Linux versions>$title" = x"$GRUB_ACTUAL_DEFAULT" ]; then
	  replacement_title="$(echo "Advanced options for ${OS}" | sed 's,>,>>,g')>$(echo "$title" | sed 's,>,>>,g')"
	  quoted="$(echo "$GRUB_ACTUAL_DEFAULT" | grub_quote)"
	  title_correction_code="${title_correction_code}if [ \"x\$default\" = '$quoted' ]; then default='$(echo "$replacement_title" | grub_quote)'; fi;"
	  grub_warn "$(gettext_printf "Please don't use old title \`%s' for GRUB_DEFAULT, use \`%s' (for versions before 2.00) or \`%s' (for 2.00 or later)" "$GRUB_ACTUAL_DEFAULT" "$replacement_title" "gnulinux-advanced-$boot_device_id>gnulinux-$version-$type-$boot_device_id")"
      fi
      echo "menuentry '$(echo "$title" | grub_quote)' ${CLASS} \$menuentry_id_option 'gnulinux-$version-$type-$boot_device_id' {" | sed "s/^/$submenu_indentation/"
  else
      echo "menuentry '$(echo "$os" | grub_quote)' ${CLASS} \$menuentry_id_option 'gnulinux-simple-$boot_device_id' {" | sed "s/^/$submenu_indentation/"
  fi      
  if [ x$type != xrecovery ] ; then
      save_default_entry | grub_add_tab
  fi

  # Use ELILO's generic "efifb" when it's known to be available.
  # FIXME: We need an interface to select vesafb in case efifb can't be used.
  if [ "x$GRUB_GFXPAYLOAD_LINUX" = x ]; then
      echo "	load_video" | sed "s/^/$submenu_indentation/"
      if grep -qx "CONFIG_FB_EFI=y" "${config}" 2> /dev/null \
	  && grep -qx "CONFIG_VT_HW_CONSOLE_BINDING=y" "${config}" 2> /dev/null; then
	  echo "	set gfxpayload=keep" | sed "s/^/$submenu_indentation/"
      fi
  else
      if [ "x$GRUB_GFXPAYLOAD_LINUX" != xtext ]; then
	  echo "	load_video" | sed "s/^/$submenu_indentation/"
      fi
      echo "	set gfxpayload=$GRUB_GFXPAYLOAD_LINUX" | sed "s/^/$submenu_indentation/"
  fi

  echo "	insmod gzio" | sed "s/^/$submenu_indentation/"

  if [ x$dirname = x/ ]; then
    if [ -z "${prepare_root_cache}" ]; then
      prepare_root_cache="$(prepare_grub_to_access_device ${GRUB_DEVICE} | grub_add_tab)"
    fi
    printf '%s\n' "${prepare_root_cache}" | sed "s/^/$submenu_indentation/"
  else
    if [ -z "${prepare_boot_cache}" ]; then
      prepare_boot_cache="$(prepare_grub_to_access_device ${GRUB_DEVICE_BOOT} | grub_add_tab)"
    fi
    printf '%s\n' "${prepare_boot_cache}" | sed "s/^/$submenu_indentation/"
  fi
  message="$(gettext_printf "Loading Linux %s ..." ${version})"
  sed "s/^/$submenu_indentation/" << EOF
	echo	'$(echo "$message" | grub_quote)'
	linux	${rel_dirname}/${basename} root=${linux_root_device_thisversion} rw ${args}
EOF
  if test -n "${initrd}" ; then
    # TRANSLATORS: ramdisk isn't identifier. Should be translated.
    message="$(gettext_printf "Loading initial ramdisk ...")"
    initrd_path=
    for i in ${initrd}; do
      initrd_path="${initrd_path} ${rel_dirname}/${i}"
    done
    sed "s/^/$submenu_indentation/" << EOF
	echo	'$(echo "$message" | grub_quote)'
	initrd	$(echo $initrd_path)
EOF
  fi
  sed "s/^/$submenu_indentation/" << EOF
}
EOF
}

machine=`uname -m`
case "x$machine" in
    xi?86 | xx86_64)
	list=
	for i in /boot/vmlinuz-* /vmlinuz-* /boot/kernel-* ; do
	    if grub_file_is_not_garbage "$i" ; then list="$list $i" ; fi
	done ;;
    *) 
	list=
	for i in /boot/vmlinuz-* /boot/vmlinux-* /vmlinuz-* /vmlinux-* /boot/kernel-* ; do
                  if grub_file_is_not_garbage "$i" ; then list="$list $i" ; fi
	done ;;
esac

case "$machine" in
    i?86) GENKERNEL_ARCH="x86" ;;
    mips|mips64) GENKERNEL_ARCH="mips" ;;
    mipsel|mips64el) GENKERNEL_ARCH="mipsel" ;;
    arm*) GENKERNEL_ARCH="arm" ;;
    *) GENKERNEL_ARCH="$machine" ;;
esac

prepare_boot_cache=
prepare_root_cache=
boot_device_id=
title_correction_code=

# Extra indentation to add to menu entries in a submenu. We're not in a submenu
# yet, so it's empty. In a submenu it will be equal to '\t' (one tab).
submenu_indentation=""

# Perform a reverse version sort on the entire list.
# Temporarily replace the '.old' suffix by ' 1' and append ' 2' for all
# other files to order the '.old' files after their non-old counterpart
# in reverse-sorted order.

reverse_sorted_list=$(echo $list | tr ' ' '\n' | sed -e 's/\.old$/ 1/; / 1$/! s/$/ 2/' | version_sort -r | sed -e 's/ 1$/.old/; s/ 2$//')

is_top_level=true
for linux in ${reverse_sorted_list}; do
  gettext_printf "Found linux image: %s\n" "$linux" >&2
  basename=`basename $linux`
  dirname=`dirname $linux`
  rel_dirname=`make_system_path_relative_to_its_root $dirname`
  version=`echo $basename | sed -e "s,vmlinuz-,,g"`
  alt_version=`echo $version | sed -e "s,\.old$,,g"`
  linux_root_device_thisversion="${LINUX_ROOT_DEVICE}"

  initrd_early=
  for i in ${GRUB_EARLY_INITRD_LINUX_STOCK} \
	   ${GRUB_EARLY_INITRD_LINUX_CUSTOM}; do
    if test -e "${dirname}/${i}" ; then
      initrd_early="${initrd_early} ${i}"
    fi
  done

  initrd_real=
  for i in "initrd.img-${version}" "initrd-${version}.img" \
	   "initrd-${alt_version}.img.old" "initrd-${version}.gz" \
	   "initrd-${alt_version}.gz.old" "initrd-${version}" \
	   "initramfs-${version}.img" "initramfs-${alt_version}.img.old" \
	   "initrd.img-${alt_version}" "initrd-${alt_version}.img" \
	   "initrd-${alt_version}" "initramfs-${alt_version}.img" \
	   "initramfs-genkernel-${version}" \
	   "initramfs-genkernel-${alt_version}" \
	   "initramfs-genkernel-${GENKERNEL_ARCH}-${version}" \
	   "initramfs-genkernel-${GENKERNEL_ARCH}-${alt_version}"; do
    if test -e "${dirname}/${i}" ; then
      initrd_real="${i}"
      break
    fi
  done

  initrd=
  if test -n "${initrd_early}" || test -n "${initrd_real}"; then
    initrd="${initrd_early} ${initrd_real}"

    initrd_display=
    for i in ${initrd}; do
      initrd_display="${initrd_display} ${dirname}/${i}"
    done
    gettext_printf "Found initrd image: %s\n" "$(echo $initrd_display)" >&2
  fi

  config=
  for i in "${dirname}/config-${version}" "${dirname}/config-${alt_version}" "/etc/kernels/kernel-config-${version}" ; do
    if test -e "${i}" ; then
      config="${i}"
      break
    fi
  done

  initramfs=
  if test -n "${config}" ; then
      initramfs=`grep CONFIG_INITRAMFS_SOURCE= "${config}" | cut -f2 -d= | tr -d \"`
  fi

  if test -z "${initramfs}" && test -z "${initrd_real}" ; then
    # "UUID=" and "ZFS=" magic is parsed by initrd or initramfs.  Since there's
    # no initrd or builtin initramfs, it can't work here.
    if [ "x${GRUB_DEVICE_PARTUUID}" = "x" ] \
	|| [ "x${GRUB_DISABLE_LINUX_PARTUUID}" = "xtrue" ]; then

	linux_root_device_thisversion=${GRUB_DEVICE}
    else
	linux_root_device_thisversion=PARTUUID=${GRUB_DEVICE_PARTUUID}
    fi
  fi

  # The GRUB_DISABLE_SUBMENU option used to be different than others since it was
  # mentioned in the documentation that has to be set to 'y' instead of 'true' to
  # enable it. This caused a lot of confusion to users that set the option to 'y',
  # 'yes' or 'true'. This was fixed but all of these values must be supported now.
  if [ "x${GRUB_DISABLE_SUBMENU}" = xyes ] || [ "x${GRUB_DISABLE_SUBMENU}" = xy ]; then
    GRUB_DISABLE_SUBMENU="true"
  fi

  if [ "x$is_top_level" = xtrue ] && [ "x${GRUB_DISABLE_SUBMENU}" != xtrue ]; then
    linux_entry "${OS}" "${version}" simple \
    "${GRUB_CMDLINE_LINUX} ${GRUB_CMDLINE_LINUX_DEFAULT}"

    submenu_indentation="$grub_tab"
    
    if [ -z "$boot_device_id" ]; then
	boot_device_id="$(grub_get_device_id "${GRUB_DEVICE}")"
    fi
    # TRANSLATORS: %s is replaced with an OS name
    echo "submenu '$(gettext_printf "Advanced options for %s" "${OS}" | grub_quote)' \$menuentry_id_option 'gnulinux-advanced-$boot_device_id' {"
    is_top_level=false
  fi

  linux_entry "${OS}" "${version}" advanced \
              "${GRUB_CMDLINE_LINUX} ${GRUB_CMDLINE_LINUX_DEFAULT}"

  if test -e "${dirname}/initramfs-${version}-fallback.img" ; then
    initrd="${initrd_early} initramfs-${version}-fallback.img"

    if test -n "${initrd}" ; then
      gettext_printf "Found fallback initrd image(s) in %s:%s\n" "${dirname}" "${initrd_extra} ${initrd}" >&2
    fi

    linux_entry "${OS}" "${version}" fallback \
                "${GRUB_CMDLINE_LINUX} ${GRUB_CMDLINE_LINUX_DEFAULT}"
  fi

  if test -e "${dirname}/booster-${version}.img" ; then
    initrd="${initrd_early} booster-${version}.img"

    if test -n "${initrd}" ; then
      gettext_printf "Found booster initrd image(s) in %s:%s\n" "${dirname}" "${initrd_extra} ${initrd}" >&2
    fi

    linux_entry "${OS}" "${version}" booster \
                "${GRUB_CMDLINE_LINUX} ${GRUB_CMDLINE_LINUX_DEFAULT}"
  fi

  if [ "x${GRUB_DISABLE_RECOVERY}" != "xtrue" ]; then
    linux_entry "${OS}" "${version}" recovery \
                "${GRUB_CMDLINE_LINUX_RECOVERY} ${GRUB_CMDLINE_LINUX}"
  fi
done

# If at least one kernel was found, then we need to
# add a closing '}' for the submenu command.
if [ x"$is_top_level" != xtrue ]; then
  echo '}'
fi

if [ -f "/etc/grub-snapshot" ]; then
  if [ "$(cat /etc/grub-snapshot | wc -l)" != 0 ]; then
    # TRANSLATORS: %s is replaced with an OS name
    echo "submenu '$(gettext_printf "Snapshot options for %s" "${OS}" | grub_quote)' \$menuentry_id_option 'gnulinux-snapshot-$boot_device_id' {"
    is_top_level=false
    snapshotanzahl="$(expr $(wc -l /etc/grub-snapshot | awk '{print $1}') + 1)"
    while (( "$(expr $snapshotanzahl - 1)" )); do
      snapshotanzahl=`expr ${snapshotanzahl} - 1`
      SNAPSHOTNAME="$(cat /etc/grub-snapshot | sed ''$snapshotanzahl'!d')"
      SNAPSHOT="rootflags=subvol=${SNAPSHOTNAME}"
      linux_entry "${OS}" "${version}" snapshot \
          "${SNAPSHOT} ${GRUB_CMDLINE_LINUX#* } ${GRUB_CMDLINE_LINUX_DEFAULT}"
    done
    echo '}'
  fi
fi

echo "$title_correction_code"