#!/bin/bash

###########################################################################
# pihole-cloudsync
# Helper script to keep multiple Pi-holes' lists synchronized via Git

# Steve Jenkins (stevejenkins.com)
# https://github.com/stevejenkins/pihole-cloudsync

version='5.0'
update='December 26, 2020'

# SETUP
# Follow the instructions in the README to set up your own private Git
# repository BEFORE running this script for the first time. This script
# will not work without a properly configured Git repo and credentials.

# USAGE: pihole-cloudsync <option>

# OPTIONS:
#  --initpush				Initialize Primary Pi-hole in "Push" mode
#  --initpull				Initialize Secondary Pi-hole in "Pull" mode
#  --push, --upload, --up, -u		Push (upload) your Pi-hole lists to a remote Git repo
#  --pull, --download, --down, -d	Pull (download) your lists from a remote Git repo
#  --help, -h, -?			Show the current version of pihole-cloudsync
#  --version, -v			Show version number

# EXAMPLES:
#  'pihole-cloudsync --push' will push (upload) your lists to a remote Git repo
#  'pihole-cloudsync --pull' will pull (download) your lists from a remote Git repo

# Project Home: https://github.com/stevejenkins/pihole-cloudsync
###########################################################################
# CONSTANTS
personal_git_dir='/usr/local/bin/my-pihole-sync'

# if [ -d "/opt/docker-pi-hole/etc-pihole" ]; then
# 	pihole_dir='/opt/docker-pi-hole/etc-pihole'
# 	gravity_db='/opt/docker-pi-hole/etc-pihole/gravity.db'
# 	dnsmasq_dir='/opt/docker-pi-hole/etc-dnsmasq.d/'
# else
	pihole_dir='/etc/pihole'
	gravity_db='/etc/pihole/gravity.db'
	dnsmasq_dir='/etc/dnsmasq.d/'
# fi

ad_list='adlist.csv'
custom_list='custom.list'
domain_list='domainlist.csv'
cname_list='05-pihole-custom-cname.conf'
localdomains_list='02-local-domains.conf'
###########################################################################
# SHOULDN'T NEED TO EDIT BELOW THIS LINE

# Force sudo if not running with root privileges
SUDO=''
if [ "$EUID" -ne 0 ]
	then SUDO='sudo'
fi

# FUNCTIONS
push_initialize () {
	# Go to Pi-hole directory, exit if doesn't exist
	cd $pihole_dir || exit

	# Verify Custom and CNAME lists exist
	touch $custom_list
	touch $dnsmasq_dir/$cname_list
	touch $dnsmasq_dir/$localdomains_list

	# Copy local Custom and CNAME lists to local Git repo
	cp $custom_list $personal_git_dir
	cp $dnsmasq_dir/$cname_list $personal_git_dir
	cp $dnsmasq_dir/$localdomains_list $personal_git_dir

	# Go to local Git repo directory
	cd $personal_git_dir || exit

	# Export Ad and Domain lists from Gravity database
	sqlite3 $gravity_db -header -csv "SELECT * FROM adlist" >$ad_list
	sqlite3 $gravity_db -header -csv "SELECT * FROM domainlist" >$domain_list

	# Add all lists to local Git repo
	git add .
	echo "Local Pi-hole initialized in Push mode and local lists were added to local Git repo. Run 'pihole-cloudsync --push' to push to remote Git repo.";
}
pull_initialize () {
	# Go to Pi-hole directory, exit if doesn't exist
	cd $personal_git_dir || exit

	# Update local Git repo from remote Git repo
	git remote update > /dev/null

	# Remove -q option if you don't want to run in "quiet" mode
	git fetch --all -q
	git reset --hard origin/main -q

	# Stop DNS server
	$SUDO service pihole-FTL stop

	# Overwrite local files
	cp $custom_list $pihole_dir
	cp $cname_list $dnsmasq_dir
	cp $localdomains_list $dnsmasq_dir

	# Overwrite local database tables
	sqlite3 $gravity_db "DROP TABLE adlist;"
	sqlite3 $gravity_db -header -csv ".import adlist.csv adlist"
	sqlite3 $gravity_db "DROP TABLE domainlist;"
	sqlite3 $gravity_db -header -csv ".import domainlist.csv domainlist"

	# Restart Pi-hole to pick up changes
	$SUDO pihole -g

	# Display success messages
	echo "Local Pi-hole initialized in Pull mode and first pull successfully completed.";
	echo "Future pulls can now be perfomed with 'pihole-cloudsync --pull'.";
}
push () {
	 # Go to Pi-hole directory, exit if doesn't exist
	cd $pihole_dir || exit

        # Copy local Custom and CNAME lists to local Git repo
        cp $custom_list $personal_git_dir
        cp $dnsmasq_dir/$cname_list $personal_git_dir
        cp $dnsmasq_dir/$localdomains_list $personal_git_dir

	# Go to local Git repo directory
        cd $personal_git_dir || exit

        # Export Ad and Domain lists from Gravity database
        sqlite3 $gravity_db -header -csv "SELECT * FROM adlist" >$ad_list
        sqlite3 $gravity_db -header -csv "SELECT * FROM domainlist" >$domain_list

	# Compare local files to remote Git repo
	git remote update > /dev/null

	# If local files are different than remote, update remote Git repo
        CHANGED=$(git --work-tree=$personal_git_dir status --porcelain)
        if [ -n "${CHANGED}" ]; then
                echo 'Local Pi-hole lists are different than remote Git repo. Updating remote repo...';
		rightnow=$(date +"%B %e, %Y %l:%M%p")
		# Remove -q option if you don't want to run in "quiet" mode
		git commit -a -m "Updated $rightnow" -q
		git push -q
		echo 'Done!';
		exit 0
        else
	# If local files are the same as remote, do nothing and exit
	echo 'Remote Git repo matches local Pi-hole lists. No further action required.';
		exit 0
        fi
}
pull () {
        # Go to Pi-hole directory, exit if doesn't exist
	cd $personal_git_dir || exit

	# Update local Git repo from remote Git repo
	git remote update > /dev/null
	CHANGED=$(git log HEAD..origin/main --oneline)
	if [ -n "${CHANGED}" ]; then
                echo 'Remote Git repo is different than local Pi-hole lists. Updating local lists...';
                # Remove -q option if you don't want to run in "quiet" mode
                git fetch --all -q
				git reset --hard origin/main -q
                $SUDO service pihole-FTL stop
                cp $custom_list $pihole_dir
                cp $cname_list $dnsmasq_dir
                cp $localdomains_list $dnsmasq_dir
                sqlite3 $gravity_db "DROP TABLE adlist;"
                sqlite3 $gravity_db -header -csv ".import adlist.csv adlist"
                sqlite3 $gravity_db "DROP TABLE domainlist;"
                sqlite3 $gravity_db -header -csv ".import domainlist.csv domainlist"
				$SUDO pihole -g
                echo 'Done!';
                exit 0
        else
                echo 'Local Pi-hole lists match remote Git repo. No further action required.';
                exit 0
        fi
}
###########################################################################
# Check to see whether a command line option was provided
if [ -z "$1" ]
  then
    echo "Missing command line option. Try --push, --pull, or --help."
    exit 1
fi
# Determine which action to perform (InitPush, InitPull, Push, Pull, or Help)
for arg in "$@"
do
    # Initialize - adds primary Pi-hole's lists to local Git repo before first push/upload
    if [ "$arg" == "--initpush" ]
    then
	echo "$arg option detected. Initializing local Git repo for Push/Upload.";
	push_initialize
	exit 0
    # Initialize - adds primary Pi-hole's lists to local Git repo before first push/upload
    elif [ "$arg" == "--initpull" ]
    then
	echo "$arg option detected. Initializing local Git repo for Pull/Download.";
	pull_initialize
	exit 0
    # Push / Upload - Pushes updated local Pi-hole lists to remote Git repo
    elif [ "$arg" == "--push" ] || [ "$arg" == "--upload" ] || [ "$arg" == "--up" ] || [ "$arg" == "-u" ]
    then
	echo "$arg option detected. Running in Push/Upload mode."
	push
	exit 0
    # Pull / Download - Pulls updated Pi-hole lists from remote Git repo
    elif [ "$arg" == "--pull" ] || [ "$arg" == "--download" ] || [ "$arg" == "--down" ]|| [ "$arg" == "-d" ]
    then
        echo "$arg option detected. Running in Pull/Download mode."
	pull
        exit 0
    # Help - Displays help dialog
    elif [ "$arg" == "--help" ] || [ "$arg" == "-h" ] || [ "$arg" == "-?" ]
    then
	cat << EOF
Usage: pihole-cloudsync <option>

Options:
  --push, --upload, --up, -u		Push (upload) your Pi-hole lists to a remote Git repo
  --pull, --download, --down, -d	Pull (download) your lists from a remote Git repo
  --initpush				Initialize Primary Pi-hole in "Push" mode
  --initpull				Initialize Secondary Pi-hole in "Pull" mode
  --help, -h, -?			Show this help dialog
  --version, -v				Show the current version of pihole-cloudsync

Examples:
  'pihole-cloudsync --push' will push (upload) your lists to a Git repo
  'pihole-cloudsync --pull' will pull (download) your lists from a Git repo

Project Home: https://github.com/stevejenkins/pihole-cloudsync
EOF

    # Version - Displays version number
    elif [ "$arg" == "--version" ] || [ "$arg" == "-v" ]
	then
	echo 'pihole-cloudsync v'$version' - Updated '"$update";
	echo 'https://github.com/stevejenkins/pihole-cloudsync';

    # Invalid command line option was passed
    else
	echo "Invalid command line option. Try --push, --pull, or --help."
	exit 1
    fi
done