post-install.sh

#!/bin/bash

BIN_DIR=/usr/bin
DATA_DIR=/var/lib/kapacitor
LOG_DIR=/var/log/kapacitor
SCRIPT_DIR=/usr/lib/kapacitor/scripts

function install_init {
    cp -f $SCRIPT_DIR/init.sh /etc/init.d/kapacitor
    chmod +x /etc/init.d/kapacitor
}

function install_systemd {
    cp -f $SCRIPT_DIR/kapacitor.service /lib/systemd/system/kapacitor.service
}

function enable_systemd {
    systemctl enable kapacitor
}

function enable_update_rcd {
    update-rc.d kapacitor defaults
}

function enable_chkconfig {
    chkconfig --add kapacitor
}

if ! id kapacitor >/dev/null 2>&1; then
    useradd --system -U -M kapacitor -s /bin/false -d $DATA_DIR
fi
chmod a+rX $BIN_DIR/kapacitor*

test -f /etc/default/kapacitor || touch /etc/default/kapacitor

# Distribution-specific logic
if [[ -f /etc/redhat-release ]]; then
    # RHEL-variant logic
    if [[ "$(readlink /proc/1/exe)" == */systemd ]]; then
        install_systemd
        # Do not enable service
    else
        # Assuming SysV
        install_init
        # Do not enable service
    fi
else
    mkdir -p $LOG_DIR
    chown -R -L kapacitor:kapacitor $LOG_DIR
    mkdir -p $DATA_DIR
    chown -R -L kapacitor:kapacitor $DATA_DIR

    if [[ -f /etc/debian_version ]]; then
        # Debian/Ubuntu logic
        if [[ "$(readlink /proc/1/exe)" == */systemd ]]; then
            install_systemd
            enable_systemd
        else
            # Assuming SysV
            install_init
            # Run update-rc.d or fallback to chkconfig if not available
            if which update-rc.d &>/dev/null; then
                enable_update_rcd
            else
                enable_chkconfig
            fi
        fi
    elif [[ -f /etc/os-release ]]; then
        source /etc/os-release
        if [[ $ID = "amzn" ]]; then
            # Amazon Linux logic
            install_init
            # Do not enable service
        fi
    fi
fi