#!/bin/sh

# Avoid executing multiple times.
if [ -n "$DEB_MAINT_PARAMS" ]; then
    eval set -- "$DEB_MAINT_PARAMS"
    if [ -z "$1" ] || [ "$1" != "remove" ]; then
        exit 0
    fi
fi

# Determine if symlinks are to be maintained, and if so, where.
if [ -h /vmlinuz -o -h /vmlinuz.old ]
then
   SYMLINKDIR=/
elif [ -h /boot/vmlinuz -o -h /boot/vmlinuz.old ]
then
   SYMLINKDIR=/boot
else
   SYMLINKDIR=
fi

# Are we going to do symlinks?
if [ -n "$SYMLINKDIR" ]
then
   vmlinuz_dir=/boot

   if [ "$vmlinuz_dir" = "$SYMLINKDIR" ]
   then
      target_prefix=
   else
      target_prefix=boot/
   fi

   # Change to the directory where the symlinks are maintained.
   cd $SYMLINKDIR

   # Announce intentions (to STDERR).
   echo "Updating symbolic links" >&2

   # Silently remove any existing symbolic links.
   rm -f vmlinuz vmlinuz.old initrd.img initrd.img.old 

   # Determine the name of a temporary file.
   outfile=$(tempfile -p outp -m 0600)

   # Make a list of the kernel images in the kernel image directory,
   # sorted in descending order by modification time, and send the
   # output to the temporary file.
   (cd "$vmlinuz_dir" && ls -td1 vmlinu[xz]-*) > $outfile

   # Determine the two newest kernel images.
   STD="$(head -n 1 $outfile)" 
   OLD="$(head -n 2 $outfile | tail -n 1)" 
   if [ "X$OLD" = "X$STD" ]; then
      OLD=
   fi

   # Delete the temporary file.
   rm -f $outfile

   if [ "X$STD" != "X" ]; then

      # Create the symbolic link for the newest kernel image; and
      # create the symbolic link for its initial RAM disk image,
      # if it has one.
      ln -s ${target_prefix}$STD vmlinuz
      STD2="$(echo $STD | sed 's/vmlinu[xz]-//')"
      if [ -f "$vmlinuz_dir/"initrd.img-$STD2 ] ; then 
         ln -s ${target_prefix}initrd.img-$STD2 initrd.img
      fi

      if [ "X$OLD" != "X" ]; then
         # Create the symbolic link for the second newest kernel image,
         # if there is one; and create the symbolic link for its initial
         # RAM disk image, if it has one.
         ln -s ${target_prefix}$OLD vmlinuz.old
         OLD2="$(echo $OLD | sed 's/vmlinu[xz]-//')"
         if [ -f "$vmlinuz_dir/"initrd.img-$OLD2 ] ; then
            ln -s ${target_prefix}initrd.img-$OLD2 initrd.img.old
         fi
      fi
   fi
fi

# All done.  Force a clean exit.
exit 0