update-grub näitab erroreid, tausta aga mitte (grub 2)

# Helper library for grub-mkconfig
# Copyright (C) 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/>.

transform="s,x,x,"

prefix=/usr
exec_prefix=${prefix}
datarootdir=${prefix}/share
datadir=${datarootdir}
sbindir=${exec_prefix}/sbin
pkgdatadir=${datadir}/`echo grub | sed "${transform}"`

grub_probe=${sbindir}/`echo grub-probe | sed ${transform}`

grub_warn ()
{
echo "Warning: $@" >&2
}

make_system_path_relative_to_its_root ()
{
path=$1
# abort if file doesn't exist
if test -e $path ; then : ;else
return 1
fi

# canonicalize
if path=`readlink -f $path` ; then : ; else
return 1
fi

# if not a directory, climb up to the directory containing it
if test -d $path ; then
dir=$path
else
dir=`echo $path | sed -e "s,/[^/]*$,,g"`
fi

num=`stat -c %d $dir`

# this loop sets $dir to the root directory of the filesystem we're inspecting
while : ; do
parent=`readlink -f $dir/..`
if [ "x`stat -c %d $parent`" = "x$num" ] ; then : ; else
# $parent is another filesystem; we found it.
break
fi
if [ "x$dir" = "x/" ] ; then
# / is our root.
break
fi
dir=$parent
done

# This function never prints trailing slashes (so that its output can be
# appended a slash unconditionally). Each slash in $dir is considered a
# preceding slash, and therefore the root directory is an empty string.
if [ "$dir" = "/" ] ; then
dir=""
fi

# XXX: This fails if $dir contains ','.
path=`echo "$path" | sed -e "s,^$dir,,g"` || return 1

case "`uname 2>/dev/null`" in
CYGWIN*)
# Cygwin: Check if regular or emulated mount.
if [ -z "$dir" ] || [ "`stat -c %D "$dir/.."`" != 620000 ] ; then
# Reached some mount point not below /cygdrive.
# GRUB does not know Cygwin's emulated mounts,
# convert to Win32 path and remove drive letter.
path=`cygpath -m "$path" | sed -n 's,^[A-Za-z]:,,p'`
test ! -z "$path" || return 1
fi ;;
esac

echo "$path"
}

is_path_readable_by_grub ()
{
path=$1

# abort if path doesn't exist
if test -e $path ; then : ;else
return 1
fi

# abort if file is in a filesystem we can't read
if ${grub_probe} -t fs $path > /dev/null 2>&1 ; then : ; else
return 1
fi

return 0
}

convert_system_path_to_grub_path ()
{
path=$1

grub_warn "convert_system_path_to_grub_path() is deprecated. Use prepare_grub_to_access_device() instead."

# abort if GRUB can't access the path
if is_path_readable_by_grub ${path} ; then : ; else
return 1
fi

if drive=`${grub_probe} -t drive $path` ; then : ; else
return 1
fi

if relative_path=`make_system_path_relative_to_its_root $path` ; then : ; else
return 1
fi

echo ${drive}${relative_path}
}

save_default_entry ()
{
if [ "x${GRUB_DEFAULT}" = "xsaved" ] ; then
echo 'saved_entry=${chosen}'
echo 'save_env saved_entry'
fi
}

prepare_grub_to_access_device ()
{
device=$1

loop_file=
case ${device} in
/dev/loop/*|/dev/loop[0-9])
loop_file=`losetup ${device} | sed -e "s/^[^(]*($[^)]\+$).*/\1/"`
case $loop_file in
/dev/*) ;;
*)
loop_device=${device}
device=`${grub_probe} --target=device "${loop_file}"`
;;
esac
;;
esac

# Abstraction modules aren't auto-loaded.
abstraction="`${grub_probe} --device ${device} --target=abstraction`"
for module in ${abstraction} ; do
echo "insmod ${module}"
done

fs="`${grub_probe} --device ${device} --target=fs`"
for module in ${fs} ; do
echo "insmod ${module}"
done

# If there's a filesystem UUID that GRUB is capable of identifying, use it;
# otherwise set root as per value in device.map.
echo "set root=`${grub_probe} --device ${device} --target=drive`"
if fs_uuid="`${grub_probe} --device ${device} --target=fs_uuid 2> /dev/null`" ; then
echo "search --no-floppy --fs-uuid --set ${fs_uuid}"
fi

if [ "x${loop_file}" != x ]; then
loop_mountpoint="$(awk '"'${loop_file}'" ~ "^"$2 && $2 != "/" { print $2 }' /proc/mounts | tail -n1)"
if [ "x${loop_mountpoint}" != x ]; then
echo "loopback loop0 ${loop_file#$loop_mountpoint}"
echo "set root=(loop0)"
fi
fi
}

grub_file_is_not_garbage ()
{
if test -f "$1" ; then
case "$1" in
*.dpkg-*) return 1 ;; # debian dpkg
esac
else
return 1
fi
return 0
}

version_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
}

version_test_gt ()
{
local a=`echo $1 | sed -e "s/[^-]*-//;s/[._-]$pre\|rc\|test\|git\|old$/~\1/g"`
local b=`echo $2 | sed -e "s/[^-]*-//;s/[._-]$pre\|rc\|test\|git\|old$/~\1/g"`
local cmp=gt
if [ "x$b" = "x" ] ; then
return 0
fi
case $a:$b in
*.old:*.old) ;;
*.old:*) a=`echo -n $a | sed -e s/\.old$//` ; cmp=gt ;;
*:*.old) b=`echo -n $b | sed -e s/\.old$//` ; cmp=ge ;;
esac
dpkg --compare-versions "$a" $cmp "$b"
return $?
}

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