#!/usr/bin/env bash
# -------------------------------------------------------------
# Handle installation, update or removal of updated 
# gphoto libraries to avoid corrupted DCIM with latest GoPro
#
# Revision history :
#   20/06/2016, V1.0 - Creation by N. Bernaerts
#   20/07/2017, V2.0 - Complete rework to become update proof
#   16/02/2018, V2.1 - Change to lauchpad Ubuntu repository
# -------------------------------------------------------------

# if no argument, display help
if [ $# -eq 0 ] 
then
  echo "Tool to install libgphoto2 2.5.10 libraries to correct latest GoPro DCIM bug under Xenial."
  echo "Parameters are :"
  echo "  --install       Install and declare the updated library"
  echo "  --remove        Back to original library"
  echo "  --update        Re-declare updated libraries"
  exit
fi

# loop to retrieve arguments
while test $# -gt 0
do
  case "$1" in
    "--install") MODE="install"; shift; ;;
    "--remove") MODE="remove"; shift; ;;
    "--update") MODE="update"; shift; ;;
    *) shift; ;;
  esac
done

# check --update or --cleanup mode
[ "${MODE}" = "" ] && { echo "Please use --install, --remove or --update mode"; exit 1; }

# generate temporary file
TMP_DEB=$(mktemp -t "XXXXXXXX.deb")

# select mode
case "${MODE}" in

  # ---------------------------
  #   Installation mode
  # ---------------------------
  "install") 

    # create main directory	
    mkdir --parent /opt/libgphoto2

    # libgphoto2-port12 : unpack
    echo "Install libgphoto2-port12"
    wget --quiet -O ${TMP_DEB} "https://launchpad.net/ubuntu/+archive/primary/+files/libgphoto2-port12_2.5.10-3_amd64.deb"
    dpkg --fsys-tarfile ${TMP_DEB} | tar xf - -C /opt/libgphoto2

    # libgphoto2-port12 : declare
    rm -f /usr/lib/x86_64-linux-gnu/libgphoto2_port.so.12
    ln -s /opt/libgphoto2/usr/lib/x86_64-linux-gnu/libgphoto2_port.so.12.0.0 /usr/lib/x86_64-linux-gnu/libgphoto2_port.so.12
    rm -Rf /usr/lib/x86_64-linux-gnu/libgphoto2_port/0.12.0
    ln -s /opt/libgphoto2/usr/lib/x86_64-linux-gnu/libgphoto2_port/0.12.0 /usr/lib/x86_64-linux-gnu/libgphoto2_port/0.12.0

    # libgphoto2 : unpack
    echo "Install libgphoto2-6"
    wget --quiet -O ${TMP_DEB} "https://launchpad.net/ubuntu/+archive/primary/+files/libgphoto2-6_2.5.10-3_amd64.deb"
    dpkg --fsys-tarfile ${TMP_DEB} | tar xf - -C /opt/libgphoto2

    # libgphoto2 : declare
    rm -f /usr/lib/x86_64-linux-gnu/libgphoto2.so.6
    ln -s /opt/libgphoto2/usr/lib/x86_64-linux-gnu/libgphoto2.so.6.0.0 /usr/lib/x86_64-linux-gnu/libgphoto2.so.6
    rm -Rf /usr/lib/x86_64-linux-gnu/libgphoto2/2.5.10
    ln -s /opt/libgphoto2/usr/lib/x86_64-linux-gnu/libgphoto2/2.5.10 /usr/lib/x86_64-linux-gnu/libgphoto2/2.5.10
    rm -f /lib/udev/hwdb.d/20-libgphoto2-6.hwdb
    ln -s /opt/libgphoto2/lib/udev/hwdb.d/20-libgphoto2-6.hwdb /lib/udev/hwdb.d/20-libgphoto2-6.hwdb

    # download this script (for post install hook)
    wget --quiet -O /opt/libgphoto2/nautilus-xenial-gopro https://raw.githubusercontent.com/NicolasBernaerts/ubuntu-scripts/master/nautilus/nautilus-xenial-gopro
    chmod +x /opt/libgphoto2/nautilus-xenial-gopro
    
    # apt post install hook : download and declare
    echo "Install apt post install hook"
    wget --quiet -O /etc/apt/apt.conf.d/99nautilus-xenial-gopro https://raw.githubusercontent.com/NicolasBernaerts/ubuntu-scripts/master/nautilus/99nautilus-xenial-gopro
    ;;

  # ---------------------------
  #   Removal mode
  # ---------------------------
  "remove")
	
    # remove targeted files and directories 
    echo "Remove links"
    rm -f /usr/lib/x86_64-linux-gnu/libgphoto2_port.so.12
    rm -Rf /usr/lib/x86_64-linux-gnu/libgphoto2_port/0.12.0
    rm -f /usr/lib/x86_64-linux-gnu/libgphoto2.so.6
    rm -Rf /usr/lib/x86_64-linux-gnu/libgphoto2/2.5.10
    rm -f /lib/udev/hwdb.d/20-libgphoto2-6.hwdb

    # remove apt post install hook
    rm /etc/apt/apt.conf.d/99nautilus-xenial-gopro

    # reinstall original packages
    echo "Reinstall original libgphoto packages"
    apt-get install --yes --reinstall libgphoto2-6 libgphoto2-port12

    # remove /opt/libgphoto2 directory structure
    rm -Rf /opt/libgphoto2
    ;;

  # ---------------------------
  #   Update mode
  # ---------------------------
  "update")

    # remove original libgphoto2_port and create links 
    echo "Declare libgphoto2_port12"
    rm -f /usr/lib/x86_64-linux-gnu/libgphoto2_port.so.12
    ln -s /opt/libgphoto2/usr/lib/x86_64-linux-gnu/libgphoto2_port.so.12.0.0 /usr/lib/x86_64-linux-gnu/libgphoto2_port.so.12
    rm -Rf /usr/lib/x86_64-linux-gnu/libgphoto2_port/0.12.0
    ln -s /opt/libgphoto2/usr/lib/x86_64-linux-gnu/libgphoto2_port/0.12.0 /usr/lib/x86_64-linux-gnu/libgphoto2_port/0.12.0

    # remove original libgphoto2 and create links 
    echo "Declare libgphoto2-6"
    rm -f /usr/lib/x86_64-linux-gnu/libgphoto2.so.6
    ln -s /opt/libgphoto2/usr/lib/x86_64-linux-gnu/libgphoto2.so.6.0.0 /usr/lib/x86_64-linux-gnu/libgphoto2.so.6
    rm -Rf /usr/lib/x86_64-linux-gnu/libgphoto2/2.5.10
    ln -s /opt/libgphoto2/usr/lib/x86_64-linux-gnu/libgphoto2/2.5.10 /usr/lib/x86_64-linux-gnu/libgphoto2/2.5.10
    rm -f /lib/udev/hwdb.d/20-libgphoto2-6.hwdb
    ln -s /opt/libgphoto2/lib/udev/hwdb.d/20-libgphoto2-6.hwdb /lib/udev/hwdb.d/20-libgphoto2-6.hwdb
    ;;

  *)
    ;;

esac

# cleanup temporary file
rm -f ${TMP_DEB}

# update hardware database
udevadm hwdb --update

# restart udev service
service udev restart