10_freebsd.in script for GRUB

[Robert Millan <rmh@aybabtu.com>]

Howdy,

Aurelien asked me about getting GRUB 2 working on GNU/kFreeBSD.  There's
been much work in upstream to implement loading for kernel of FreeBSD, and
recently some polish in the installer, etc.

grub-mkconfig (update-grub's backend), however, still generates entries
based on the single /boot/kernel/kernel instance.  I hear you want it
multi-version like on GNU/Linux, and support for loading acpi.ko too.

I implemented both of them.  It's basically a rewrite of 10_freebsd.in
based on our existing 10_linux.in.  It'll need some adjustments in upstream
so they can share more code, but for now you can test it already, see
attachment.

(you can put it in util/grub.d/ and rebuild GRUB, or do the autoconf
sed magic by hand)

-- 
Robert Millan

  The DRM opt-in fallacy: "Your data belongs to us. We will decide when (and
  how) you may access your data; but nobody's threatening your freedom: we
  still allow you to remove your data and not access it at all."

#! /bin/sh -e

# update-grub helper script.
# Copyright (C) 2006,2007,2008,2009  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=@prefix@
exec_prefix=@exec_prefix@
libdir=@libdir@
. ${libdir}/grub/grub-mkconfig_lib

case "${GRUB_DISTRIBUTOR}" in
  Debian)	OS="${GRUB_DISTRIBUTOR} GNU/kFreeBSD" ;;
  *)		OS="FreeBSD" ;;
esac

test_numeric ()
{
  local a=$1
  local cmp=$2
  local b=$3
  if [ "$a" = "$b" ] ; then
    case $cmp in
      ge|eq|le) return 0 ;;
      gt|lt) return 1 ;;
    esac
  fi
  if [ "$cmp" = "lt" ] ; then
    c=$a
    a=$b
    b=$c
  fi
  if (echo $a ; echo $b) | sort -n | head -n 1 | grep -qx $b ; then
    return 0
  else
    return 1
  fi
}

test_gt ()
{
  local a=`echo $1 | sed -e "s/[^-]*-//g"`
  local b=`echo $2 | sed -e "s/[^-]*-//g"`
  local cmp=gt
  if [ "x$b" = "x" ] ; then
    return 0
  fi
  case $a:$b in
    *.old:*.old) ;;
    *.old:*) a=`echo -n $a | sed -e s/\.old$//g` ; cmp=gt ;;
    *:*.old) b=`echo -n $b | sed -e s/\.old$//g` ; cmp=ge ;;
  esac
  test_numeric $a $cmp $b
  return $?
}

find_latest ()
{
  local a=""
  for i in $@ ; do
    if test_gt "$i" "$a" ; then
      a="$i"
    fi
  done
  echo "$a"
}

kfreebsd_entry ()
{
  cat << EOF
menuentry "$1" {
EOF
  prepare_grub_to_access_device ${GRUB_DEVICE_BOOT} | sed -e "s/^/\t/"
  cat << EOF
	freebsd			${rel_dirname}/${basename}
EOF

  if test -n "${devices}" ; then
    cat << EOF
	freebsd_loadenv		${devices_rel_dirname}/${devices_basename}
EOF
  fi

  if test -n "${acpi_ko}" ; then
    cat << EOF
	freebsd_module_elf	${acpi_ko_rel_dirname}/${acpi_ko_basename}
EOF
  fi

  cat << EOF
	set FreeBSD.vfs.root.mountfrom=${kfreebsd_fs}:${GRUB_DEVICE}
	set FreeBSD.vfs.root.mountfrom.options=rw
}
EOF
}

list=`for i in /boot/kfreebsd-* /boot/kernel/kernel ; do
        if grub_file_is_not_garbage "$i" ; then echo -n "$i " ; fi
      done`

while [ "x$list" != "x" ] ; do
  kfreebsd=`find_latest $list`
  echo "Found kernel of FreeBSD: $kfreebsd" >&2
  basename=`basename $kfreebsd`
  dirname=`dirname $kfreebsd`
  rel_dirname=`make_system_path_relative_to_its_root $dirname`

  if [ x"$devices" != "x" ] ; then
    devices_basename=`basename $devices`
    devices_dirname=`dirname $devices`
    devices_rel_dirname=`make_system_path_relative_to_its_root $devices_dirname`
  fi

  # For "ufs" it's the same.  Do we care about the others?
  kfreebsd_fs=${GRUB_FS}

  version=`echo $basename | sed -e "s,^[^0-9]*-,,g;s/\.gz$//g"`
  alt_version=`echo $version | sed -e "s,\.old$,,g"`

  acpi_ko=
  for i in "/lib/modules/${version}/acpi.ko" "/lib/modules/${alt_version}/acpi.ko" \
      "/boot/kernel/acpi.ko"; do
    if test -e "$i" ; then
      acpi_ko="$i"
      break
    fi
  done
  if test -n "${acpi_ko}" ; then
    echo "Found ACPI module: ${acpi_ko}" >&2
    acpi_ko_basename=`basename ${acpi_ko}`
    acpi_ko_dirname=`dirname ${acpi_ko}`
    acpi_ko_rel_dirname=`make_system_path_relative_to_its_root $acpi_ko_dirname`
  fi

  kfreebsd_entry "${OS}, kFreeBSD ${version}"

  list=`echo $list | tr ' ' '\n' | grep -vx $kfreebsd | tr '\n' ' '`
done