installer.sh

#!/bin/bash
# shellcheck disable=SC2068
clear
set -e

# housekeeping

# Check if script is running as root
if [ "$(id -u)" -ne 0 ]; then
    echo "This script must be run as root."
    exit 1
fi

# Check if the user passed "--skip-os-check" flag
if [[ "$1" == "--skip-os-check" ]]; then
    echo "Skipping OS check."
else
    # Perform the OS check
    if grep -q 'ID=debian' /etc/os-release && grep -q 'VERSION_ID="12"' /etc/os-release; then
        echo "Operating system is Debian 12."
    else
        clear
        echo "Operating system is not Debian 12. The script will likely break with other distributions."
        echo "You can bypass this check by running 'install.sh --skip-os-check'."
        exit 1
    fi
fi

# Check if systemd is available
if ! command -v systemctl >/dev/null 2>&1; then
    echo "systemd is not available. This script requires systemd as the init system."
    exit 1
fi

# Check if apt is the package manager
if ! command -v apt >/dev/null 2>&1; then
    echo "apt is not available. This script requires apt as the package manager."
    exit 1
fi

# Check for available disk space (25 GB)
required_disk_space=$((25 * 1024))  # 25 GB in MB
available_disk_space=$(df -m --output=avail / | awk 'NR==2 {print $1}')
if [ "$available_disk_space" -lt "$required_disk_space" ]; then
    echo "Insufficient disk space. At least 25 GB of free disk space will be required."
    exit 0
fi

apt update
apt install wget dialog -y

# Check if github.com is reachable
if ! wget -q https://github.com 2>/dev/null; then
    echo "Unable to reach github.com. Please check your internet connection."
    exit 1
fi

cd /root

dialog --title "Welcome! Here be dragons..." --msgbox "This script can install or uninstall the service and most related packages. It will also edit cron jobs and do many other things. I don't really know what I'm doing so I would only run this in a Virtual Machine if I were you... Have fun!" 0 0; clear

MODE=$(dialog --title "Please choose the mode." --menu "Script Mode" 0 0 0 \
  1 "Install" \
  2 "Uninstall" \
  3>&1 1>&2 2>&3 3>&-); clear # hide the output from `dialog` without hiding errors

if [ "$MODE" == "1" ]; then
    dialog --yesno "There are some copyright concerns with this project. You are running this service at your own risk -- do you agree?" 0 0 && clear || exit 0
    VERSION=$(dialog --title "Please choose the version." --menu "Script Mode" 0 0 0 \
    1 "Stable" \
    2 "Beta" \
    3>&1 1>&2 2>&3 3>&-); clear # hide the output from `dialog` without hiding errors
fi

# pathing and variables
BASE_FOLDER=/srv/bbc-rr
ICECAST_XML=/etc/icecast2/icecast.xml
KILL_FFMPEG=$BASE_FOLDER/cron-scripts/kill-ffmpeg
PURGE_OGG=$BASE_FOLDER/cron-scripts/purge-ogg
RESYNC=$BASE_FOLDER/cron-scripts/resync
DOWNLOADER=$BASE_FOLDER/run-scripts/downloader.sh
RESTART_SERVICE=$BASE_FOLDER/run-scripts/restart-service.sh
START_RADIO=$BASE_FOLDER/run-scripts/start_radio.sh
STD_PACKAGES="unattended-upgrades wget unzip dialog python3 pip python3-jinja2"
XTR_PACKAGES="ffmpeg ices2 icecast2 nginx"
STABLE_VERSION=1.3.2a

# install/uninstall packages, files, and folders

if [ "$MODE" == "1" ]; then
    # install all packages
    apt upgrade -yq
    for package in ${STD_PACKAGES[@]}; do # don't double-quote or the packages will be passed as a single string
        apt install "$package" -y
    done
    for package in ${XTR_PACKAGES[@]}; do # don't double-quote or the packages will be passed as a single string
        apt install "$package" -y
    done
    # files and folders
    rm -rf /opt/BBC-Radio-Relay* & rm -rf /opt/bbc-radio-relay*
    mkdir -pv $BASE_FOLDER/www/stations
    mkdir -pv $BASE_FOLDER/www/media # in anticipation of downloader script

    if [ "$VERSION" == "1" ]; then
        wget "https://github.com/zenodotus280/BBC-Radio-Relay/archive/refs/tags/v${STABLE_VERSION}.zip" -O /opt/bbc-radio-relay.zip
        unzip -d /opt /opt/bbc-radio-relay.zip
        cp -r /opt/BBC-Radio-Relay-${STABLE_VERSION}/radio-relay/* $BASE_FOLDER
        cp -r /opt/BBC-Radio-Relay-${STABLE_VERSION}/radio-player/* $BASE_FOLDER/www
        cp -r /opt/BBC-Radio-Relay-${STABLE_VERSION}/config $BASE_FOLDER

    elif [ "$VERSION" == "2" ]; then
        wget "https://github.com/zenodotus280/BBC-Radio-Relay/archive/refs/heads/master.zip" -O /opt/bbc-radio-relay.zip
        unzip -d /opt /opt/bbc-radio-relay.zip
        cp -r /opt/BBC-Radio-Relay-master/radio-relay/* $BASE_FOLDER
        cp -r /opt/BBC-Radio-Relay-master/radio-player/* $BASE_FOLDER/www
        cp -r /opt/BBC-Radio-Relay-master/config $BASE_FOLDER
    fi

    mv $BASE_FOLDER/config/nginx-default.conf /etc/nginx/sites-available/default
    cd $BASE_FOLDER/www
    python3 $BASE_FOLDER/www/generate.py
    cd /root

elif [ "$MODE" == "2" ]; then
    # stop services if running and remove uncommon packages
    systemctl stop icecast2
    systemctl stop nginx
    # Kill processes with names containing 'downloader', 'restart-service', 'ffmpeg', 'ices2', 'icecast2', 'bbc-rr'
    # or processes with 'sleep' followed by specific patterns of digits at the end of the command line.
    pkill -f '
        (downloader|
        restart-service|
        ffmpeg|
        ices2|
        icecast2|
        bbc-rr|
        sleep.*[3-9][6-9][0-9]\{2\}$\|sleep.*[4-9][0-9]\{3\}$\|sleep.*[1-9][0-9]\{4,\}$ # capture unstarted radio stations
    )'

    for package in ${XTR_PACKAGES[@]}; do # don't double-quote or the packages will be passed as a single string
        apt purge "$package" -y
    done
        apt autoremove
        apt autoclean
    
else
    echo "Invalid mode."
fi

# configure

if [ "$MODE" == "1" ]; then
    # set passwords and configure icecast2 
    PASSWORD=$(head -c 32 /dev/random | base64 | tr -dc 'a-zA-Z0-9')
    sed -i "s/hackme/$PASSWORD/g" $ICECAST_XML $START_RADIO
    sed -i "/sources/s/2/100/" $ICECAST_XML
    mkdir -p /var/log/ices
    echo "ENABLE=true" >> /etc/default/icecast2
    # set permissions and configure BASE_FOLDER
    chmod -R 774 $BASE_FOLDER
    chmod +X $BASE_FOLDER
    chmod -R +wx $KILL_FFMPEG $PURGE_OGG $RESYNC $DOWNLOADER $RESTART_SERVICE $START_RADIO
    sed -i 's|BASE_FOLDER=|BASE_FOLDER='"$BASE_FOLDER"'|' $KILL_FFMPEG $PURGE_OGG $RESYNC $DOWNLOADER $RESTART_SERVICE $START_RADIO
    chown -R root:www-data $BASE_FOLDER/www # for NGINX permissions
    chmod -R 0755 $BASE_FOLDER/www # for NGINX permissions

elif [ "$MODE" == "2" ]; then
    # remove as much of the installation as possible
    rm -rf /etc/icecast2 /var/log/ices /var/log/icecast2 $BASE_FOLDER 
    rm -rf /opt/BBC-Radio-Relay* & rm -rf /opt/bbc-radio-relay*
    rm -rf /srv/bbc-rr/*
else
    echo "Invalid mode."
fi

# cronjobs

if [ "$MODE" == "1" ] || [ "$MODE" == "2" ]; then
    # initialise and backup the current crontab
    echo "###" | crontab -
    crontab -l > crontab.bak

    # The cron entries
        #kill_ffmpeg: keep file lengths under 12 hours
        #purge_ogg:   clean up day-old audio files
        #             reboot at 6am weekly to remain in sync
        #resync:      bootstrap the relay on boot
    CRON=("0 */12 * * * sh $KILL_FFMPEG" "0 */1 * * * sh $PURGE_OGG" "0 6 * * 1 apt upgrade -y; systemctl reboot" "@reboot sh $RESYNC")

    # Escape the asterisks
    CRON=("${CRON[@]/\*/\*}")
else
    echo "Invalid mode."
fi

if [ "$MODE" == "1" ]; then
    # Add the lines to the crontab
    for line in "${CRON[@]}"; do
        if ! grep -q "$line" crontab.bak; then
            echo "$line" >> crontab.bak
        fi
    done
elif [ "$MODE" == "2" ]; then
    # Remove the lines from the crontab
    for line in "${CRON[@]}"; do
        if grep -q "$line" crontab.bak; then
            sed -i "/${line}/d" crontab.bak || dialog --title "Line Not Found" --msgbox "The line: $line was not found in the crontab. \nIt may have been altered or removed manually." 0 0
        fi
    sed -i "/###/d" crontab.bak
    done
else
    echo "Invalid mode."
fi

if [ "$MODE" == "1" ] || [ "$MODE" == "2" ]; then
    # Install the modified crontab
    crontab crontab.bak

    # Remove the backup file
    rm crontab.bak
fi

# start
if [ "$MODE" == "1" ]; then
    systemctl enable icecast2 nginx
    systemctl start icecast2 nginx # 'systemctl enable --now' was not working
    bash $RESYNC
    systemctl reload nginx
    dialog --title "Pre-Reboot Test" --msgbox "Check that ports 80, 8080, and 8000 are accessible before continuing (it may take 30 seconds). The WebUI runs on port 80 and the reverse proxy for the audio runs on port 8080 and redirects to Icecast on port 8000. It will take 8 hours for the streams to populate - in the meantime the WebUI defaults to bbcradiorelay.net" 0 0
    dialog --yesno "The test streams will be disabled after rebooting.\n\nSelect 'Yes' when you've finished testing ports 80, 8080 and 8000 to reboot." 0 0 && sed -i 's/startCustomstream $2 #user-defined/#&/' $START_RADIO && reboot || exit 0
elif [ "$MODE" == "2" ]; then
    # Delete the script itself if it still exists
    dialog --yesno "Select 'Yes' to delete this script." 0 0 && rm -- "$0" || exit 0
else
    echo "Invalid mode."
fi