post_install() {
    echo
    
    systemctl daemon-reload    
    
    ### Apache ###
    if [ -f /usr/lib/systemd/system/httpd.service ]
    then
        # Check if the main conf file is present
        if [ -f /etc/httpd/conf/httpd.conf ]
        then
            # Enable mod_proxy
            sed -i 's|#LoadModule proxy_module modules/mod_proxy.so|LoadModule proxy_module modules/mod_proxy.so|g' /etc/httpd/conf/httpd.conf
            # Enable mod_proxy_fcgi
            sed -i 's|#LoadModule proxy_fcgi_module modules/mod_proxy_fcgi.so|LoadModule proxy_fcgi_module modules/mod_proxy_fcgi.so|g' /etc/httpd/conf/httpd.conf
            # Enable mod_rewrite
            sed -i 's|#LoadModule rewrite_module modules/mod_rewrite.so|LoadModule rewrite_module modules/mod_rewrite.so|g' /etc/httpd/conf/httpd.conf
            # Enable mod_cgid
            sed -i 's|#LoadModule cgid_module modules/mod_cgid.so|LoadModule cgid_module modules/mod_cgid.so|g' /etc/httpd/conf/httpd.conf
            
            # Enable ZoneMinder's VirtualHost
            if ( ! grep -q 'zoneminder.conf' /etc/httpd/conf/httpd.conf )
            then
                echo "Include conf/extra/zoneminder.conf" >> /etc/httpd/conf/httpd.conf
            fi
        fi
            
        # Check if Nginx is running and if not (re)start Apache
        if [ "$(systemctl is-active nginx)" != "active" ]
        then
            systemctl is-active --quiet httpd && systemctl stop httpd
            systemctl start httpd
        fi
    fi
    
    
    ### Nginx ###
    if [ -f /usr/lib/systemd/system/nginx.service ]
    then
        # Check if the main conf file is present
        if [ -f /etc/nginx/nginx.conf ]
        then
            # Configure it with the folder structure used in Debian-based distributions
            if ( ! grep -q 'sites-enabled' /etc/nginx/nginx.conf )
            then
                sed -i 's|http {|http {\'$'\n    include       sites-enabled/*.conf;|g' /etc/nginx/nginx.conf
            fi
            
            # Enable ZoneMinder's server block
            if [ ! -d /etc/nginx/sites-enabled ]
            then
                mkdir -p /etc/nginx/sites-enabled
            fi
            
            if [ ! -f /etc/nginx/sites-enabled/zoneminder.conf ]
            then
                ln -s /etc/nginx/sites-{available,enabled}/zoneminder.conf
            fi
        fi
        
        # Check if Apache is running and if not (re)start Nginx
        if [ "$(systemctl is-active httpd)" != "active" ]
        then
            systemctl is-active --quiet nginx && systemctl stop nginx
            systemctl start nginx
        fi
    fi
    
    
    ### fcgiwrap ###
    
    if [ -f /usr/lib/systemd/system/fcgiwrap.service ]
    then
        systemctl is-active --quiet fcgiwrap.socket && systemctl stop fcgiwrap.socket
        systemctl is-active --quiet fcgiwrap && systemctl stop fcgiwrap
        systemctl start fcgiwrap.socket
    fi
    
    
    ### PHP-FPM ###
    # Set local timezone in /etc/php/conf.d/zoneminder.ini
    sed -i 's|PLACEHOLDER|'`timedatectl | grep "Time zone" | tr -s ' ' | cut -f4 -d ' '`'|g' /etc/php/conf.d/zoneminder.ini
    
    if [ -f /usr/lib/systemd/system/php-fpm.service ]
    then
        systemctl is-active --quiet php-fpm && systemctl stop php-fpm
        systemctl start php-fpm
    fi
    

    ### MariaDB ###
    
    if [ -f /usr/lib/systemd/system/mariadb.service ]
    then
        # Initialize MariaDB's default database if it's not already initialized
        if [ ! -d /var/lib/mysql/mysql ]
        then
            systemctl is-active --quiet mariadb && systemctl stop mariadb
            # NOTE: This will need to be changed when MariaDB 10.2 hits the repos, as mysql_install_db has been deprecated in favor of mysqld
            mysql_install_db --user=mysql --basedir=/usr --datadir=/var/lib/mysql 2> /dev/null
        fi
        
        systemctl is-active --quiet mariadb || systemctl start mariadb
        
        # Create ZoneMinder's database & user if they do not exist
        if [ ! -d /var/lib/mysql/zm ]
        then
            # Check for database root password
            if [[ "$(mysql -uroot -e "select * from mysql.user;" 2>&1)" = *"Access denied"* ]]
            then
                # If a database root password is set
                echo \* Secure MariaDB installation found, please enter the database root password when prompted.
                echo
                mysql -uroot -p < /usr/share/zoneminder/db/zm_create.sql
                echo
                echo \* One more time...
                echo
                mysql -uroot -p -e "grant select,insert,update,delete,create,alter,index,lock tables on zm.* to 'zmuser'@localhost identified by 'zmpass';"
                echo
            else
                # If a database root password is not set
                mysql -uroot < /usr/share/zoneminder/db/zm_create.sql
                mysql -uroot -e "grant select,insert,update,delete,create,alter,index,lock tables on zm.* to 'zmuser'@localhost identified by 'zmpass';"
            fi
        fi
    fi
    
    
    ### ZoneMinder ###
    
    systemctl is-active --quiet zoneminder && systemctl stop zoneminder
    systemd-tmpfiles --create
    systemctl start zoneminder
    
    
    echo ---------------
    echo
    echo ZoneMinder is listening at http://localhost:8095    
    echo
}

post_upgrade() {
    post_install
    
    echo ---------------
    echo
    echo The ZoneMinder updater will now run.
    
    # Make sure ZoneMinder is *not* running before we attempt to use its updater
    systemctl is-active --quiet zoneminder && systemctl stop zoneminder
    /usr/bin/zmupdate.pl -f
    systemctl start zoneminder
    
    echo
    echo Update complete.
    echo
}

post_remove() {
    systemctl daemon-reload && systemctl is-active --quiet zoneminder && systemctl stop zoneminder
    
    # Disable ZoneMinder's Apache VirtualHost
    if [ -f /etc/httpd/conf/httpd.conf ]
    then
        sed -i '/zoneminder.conf/d' /etc/httpd/conf/httpd.conf
    fi
    
    # Disable ZoneMinder's Nginx server block
    if [ -h /etc/nginx/sites-enabled/zoneminder.conf ]
    then
        rm /etc/nginx/sites-enabled/zoneminder.conf
        
        # If the sites-enabled directory is empty, remove it as well and also remove reference in nginx.conf
        if [ -z "$(ls -A /etc/nginx/sites-enabled)" ]
        then
            rm -r /etc/nginx/sites-enabled
            sed -i '/sites-enabled/d' /etc/nginx/nginx.conf
        fi
    fi
    
    # Notify user about ZoneMinder's database and user not being removed
    if [ -d /var/lib/mysql/zm ]
    then
        echo
        echo ZoneMinder\'s database and user have been left intact. You can remove them by running the following:
        echo
        echo mysql -uroot -p -e \"drop database zm\;\"
        echo mysql -uroot -p -e \"drop user \'zmuser\'@localhost\;\"
        echo
        echo If you haven\'t yet configured a password for the database root user, omit the \'-p\' option.
        echo
    fi
}