Radix cross Linux

#!/bin/sh

# Preserve new files
install_file() {
  NEW="$1"
  OLD="`dirname $NEW`/`basename $NEW .new`"
  # If there's no file by that name, mv it over:
  if [ ! -r $OLD ]; then
    mv $NEW $OLD
  elif [ "`cat $OLD | md5sum`" = "`cat $NEW | md5sum`" ]; then # toss the redundant copy
    rm $NEW
  fi
  # Otherwise, we leave the .new copy for the admin to consider...
}

preserve_perms() {
  NEW="$1"
  OLD="$(dirname $NEW)/$(basename $NEW .new)"
  if [ -e $OLD ]; then
    cp -a $OLD ${NEW}.incoming
    cat $NEW > ${NEW}.incoming
    touch -r $NEW ${NEW}.incoming
    mv ${NEW}.incoming $NEW
  fi
  install_file $NEW
}


# arg 1:  the new package version
pre_install() {
  /bin/true
}

# arg 1:  the new package version
post_install() {
  install_file etc/grub.d/40_custom.new
  rm -f etc/grub.d/40_custom.new
  install_file etc/default/grub.new

  #
  # NOTE:
  #   'install-info' can work using relative paths and we can make use build machine
  #   utility during installation to the some partition and use target 'install-info'
  #   during installation directly on the running target machine.
  #
  if [ -x /usr/bin/install-info ] ; then
    install-info --info-dir=usr/share/info usr/share/info/grub.info.gz     2>/dev/null
    install-info --info-dir=usr/share/info usr/share/info/grub-dev.info.gz 2>/dev/null
  elif ! grep "(grub)" usr/share/info/dir 1> /dev/null 2> /dev/null ; then
  cat << EOF >> usr/share/info/dir

Kernel
* grub-dev: (grub-dev).         The GRand Unified Bootloader Dev
* grub-install: (grub)Invoking grub-install.
                                Install GRUB on your drive
* grub-mkconfig: (grub)Invoking grub-mkconfig.
                                Generate GRUB configuration
* grub-mkpasswd-pbkdf2: (grub)Invoking grub-mkpasswd-pbkdf2.
* grub-mkrelpath: (grub)Invoking grub-mkrelpath.
* grub-mkrescue: (grub)Invoking grub-mkrescue.
                                Make a GRUB rescue image
* grub-mount: (grub)Invoking grub-mount.
                                Mount a file system using GRUB
* grub-probe: (grub)Invoking grub-probe.
                                Probe device information
* grub-script-check: (grub)Invoking grub-script-check.
* GRUB: (grub).                 The GRand Unified Bootloader
EOF
  fi
}

# arg 1:  the new package version
# arg 2:  the old package version
pre_update() {
  /bin/true
}

# arg 1:  the new package version
# arg 2:  the old package version
post_update() {
  post_install
}

# arg 1:  the old package version
pre_remove() {
  if [ -x /usr/bin/install-info ] ; then
    install-info --delete --info-file=usr/share/info/grub-dev.info.gz --dir-file=usr/share/info/dir 2> /dev/null || /bin/true
    install-info --delete --info-file=usr/share/info/grub.info.gz     --dir-file=usr/share/info/dir 2> /dev/null || /bin/true
  fi
}

# arg 1:  the old package version
post_remove() {
  /bin/true
}


operation=$1
shift

$operation $*