#! /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/>.
#
# Save this file in /etc/grub.d/09_slackware_linux

prefix="/usr"
exec_prefix="${prefix}"
datarootdir="${prefix}/share"

. "${datarootdir}/grub/grub-mkconfig_lib"

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

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

if [ "${GRUB_DISTRIBUTOR}" = "" ] ; then
  OS=GNU/Linux
else
  OS="${GRUB_DISTRIBUTOR} GNU/Linux"
  CLASS="--class $(echo "${GRUB_DISTRIBUTOR}" | tr '[:upper:]' '[:lower:]') ${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 [ "${GRUB_DEVICE_UUID}" = "" ] || [ "${GRUB_DISABLE_LINUX_UUID}" = "true" ] \
    || ! test -e "/dev/disk/by-uuid/${GRUB_DEVICE_UUID}" ; then
  LINUX_ROOT_DEVICE=${GRUB_DEVICE}
else
  LINUX_ROOT_DEVICE=UUID=${GRUB_DEVICE_UUID}
fi

linux_entry ()
{
  os="$1"
  tag="$2"
  version="$3"
  recovery="$4"
  args="$5"
  if ${recovery} ; then
    title="$(gettext "%s, with Linux %s [%s] (recovery mode)")"
  else
    title="$(gettext "%s, with Linux %s [%s]")"
  fi
  printf "menuentry \"${title}\" ${CLASS} {\n" "${os}" "${version}" "${tag}"
  save_default_entry | sed -e "s/^/\t/"

  # 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 [ "$GRUB_GFXPAYLOAD_LINUX" = "" ]; then
      if grep -qx "CONFIG_FB_EFI=y" /boot/config-"${version}" 2> /dev/null \
      && grep -qx "CONFIG_VT_HW_CONSOLE_BINDING=y" /boot/config-"${version}" 2> /dev/null; then
      cat << EOF
    set gfxpayload=keep
EOF
      fi
  else
      cat << EOF
    set gfxpayload=$GRUB_GFXPAYLOAD_LINUX
EOF
  fi

  if [ -z "${prepare_boot_cache}" ]; then
    prepare_boot_cache="$(prepare_grub_to_access_device "${GRUB_DEVICE_BOOT}" | sed -e "s/^/\t/")"
  fi
  printf '%s\n' "${prepare_boot_cache}"
  cat << EOF
    echo    $(printf "$(gettext "Loading Linux %s ...")" "${version}")
    linux    ${rel_dirname}/${basename} root=${linux_root_device_thisversion} ro ${args}
EOF
  if test -n "${initrd}" ; then
    cat << EOF
    echo    $(gettext "Loading initial ramdisk ...")
    initrd    ${rel_dirname}/${initrd}
EOF
  fi
  cat << EOF
}
EOF
}

process_list() {
    mylist="$1"
    tag="$2"
    initrd_allowed="$3"

    # Version-sort the kernels
    sorted_kernels=$(echo "$mylist" | version_sort -r)

    # Use portable command substitution
    kernels=$(echo "$sorted_kernels" | tr ' ' '\n')

    for kernel in $kernels; do
        # Skip symbolic links
        if [ -L "$kernel" ]; then
            continue
        fi

        printf "Found linux image: %s\n" "$kernel" >&2
        basename=$(basename "$kernel")
        dirname=$(dirname "$kernel")
        rel_dirname=$(make_system_path_relative_to_its_root "$dirname")
        version=$(echo "$basename" | sed -e "s,^[^0-9]*-,,g")
        alt_version=$(echo "$version" | sed -e "s,\.old$,,g")
        linux_root_device_thisversion="${LINUX_ROOT_DEVICE}"
        initrd=

        if [ "${initrd_allowed}" = "true" ]; then
            for i in "initrd-${version}.gz" "initrd.gz" \
                "initrd.img-${version}" "initrd-${version}.img" \
                "initrd-${version}" "initrd.img-${alt_version}" \
                "initrd-${alt_version}.img" "initrd-${alt_version}"; do
                if [ -e "${dirname}/${i}" ]; then
                    initrd="$i"
                    break
                fi
            done

            if [ -n "${initrd}" ]; then
                printf "Found initrd image: %s/%s\n" "${dirname}" "${initrd}" >&2
            else
                # "UUID=" magic is parsed by initrds.  Since there's no initrd, it can't work here.
                linux_root_device_thisversion=${GRUB_DEVICE}
            fi
        else
            # "UUID=" magic is parsed by initrds.  Since there's no initrd, it can't work here.
            linux_root_device_thisversion=${GRUB_DEVICE}
        fi

        linux_entry "${OS}" "${tag}" "${version}" false \
            "${GRUB_CMDLINE_LINUX} ${GRUB_CMDLINE_LINUX_DEFAULT}"

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

prepare_boot_cache=

list=$(for i in /boot/vmlinu[xz]-generic-* /vmlinu[xz]-generic-* ; do
        if grub_file_is_not_garbage "$i" ; then printf "%s " "$i"; fi
      done)

process_list "${list}" "generic" "true"

list=$(for i in /boot/vmlinu[xz]-custom-* /vmlinu[xz]-custom-* ; do
        if grub_file_is_not_garbage "$i" ; then printf "%s " "$i"; fi
      done)
process_list "${list}" "custom" "true"

list=$(for i in /boot/vmlinu[xz]-huge-* /vmlinu[xz]-huge-* ; do
        if grub_file_is_not_garbage "$i" ; then printf "%s " "$i"; fi
      done)
process_list "${list}" "huge" "false"