pre_install() {
    set -e
    abort=false
    if [ -L /srv/http/zoneminder/events ]; then
        l=$(readlink /srv/http/zoneminder/events)
        if [ $l != /var/cache/zoneminder/events ]; then
            abort=true
        fi
    fi
    if [ -L /srv/http/zoneminder/images ]; then
        l=$(readlink /srv/http/zoneminder/images)
        if [ $l != /var/cache/zoneminder/images ]; then
            abort=true
        fi
    fi
    if [ $abort = true ]; then
        cat >&2 << EOF
Aborting installation of zoneminder due to non-default symlinks in
/srv/http/zoneminder for the images and/or events directory, which could
result in loss of data. Please move your data in each of these directories to
/var/cache/zoneminder before installing zoneminder from the package.
EOF
        exit 1
    fi
    exit 0
}

post_install() {
    if [[ -d /var/log/zoneminder ]]; then
        chmod 0755 /var/log/zoneminder
        chown http.http /var/log/zoneminder
    else
        mkdir -m 0755 /var/log/zoneminder
        chown http.http /var/log/zoneminder
    fi
    if [[ -d /tmp/zm ]]; then
        chmod 0700 /tmp/zm
        chown http.http /tmp/zm
    else
        mkdir -m 0700 /tmp/zm
        chown http.http /tmp/zm
    fi

    # edit /etc/php.ini for Zoneminder
    sed -e '
    # Enable these libraries by removing the leading comment character
    \|^;extension=mysql.so$| s|^;||;
    \|^;extension=mysqli.so$| s|^;||;
    \|^;extension=pdo_mysql.so$| s|^;||;
    \|^;extension=gd.so$| s|^;||;
    \|^;extension=gettext.so$| s|^;||;
    \|^;extension=mcrypt.so$| s|^;||;
    \|^;extension=session.so$| s|^;||;
    \|^;extension=sockets.so$| s|^;||;
    \|^;extension=openssl.so$| s|^;||;
    \|^;extension=ftp.so$| s|^;||;
    \|^;extension=zip.so$| s|^;||;
    
    # Add zoneminder paths to open_basedir
    s|^open_basedir = /srv/http/:/home/:/tmp/:/usr/share/pear/:/usr/share/webapps/$|&:/etc:/srv/http/zoneminder/:/var/cache/zoneminder/|;
    ' /etc/php/php.ini > /etc/php/php.ini.zoneminder

    # edit /etc/httpd/conf/httpd.conf for Zoneminder
    sed -e '
    # Use mod_mpm_prefork instead of mod_mpm_event.so (FS#39218).
    s|^LoadModule mpm_event_module modules/mod_mpm_event.so$|#&\nLoadModule mpm_prefork_module modules/mod_mpm_prefork.so|;
    
    # Zoneminder requires cgi
    \|^#LoadModule cgi_module modules/mod_cgi.so$| s|#||;
    
    # libphp5
    \|^LoadModule php5_module modules/libphp5.so$|d;
    s|^#*LoadModule rewrite_module modules/mod_rewrite.so$|&\nLoadModule php5_module modules/libphp5.so|;
    \|^Include /etc/httpd/conf/extra/php5_module.conf|d;
    s|^Include conf/extra/httpd-default.conf$|&\nInclude /etc/httpd/conf/extra/php5_module.conf|;
    
    # Include httpd-zoneminder.conf
    \|^Include /etc/httpd/conf/extra/httpd-zoneminder.conf$|d;
    s|^# Server-pool management (MPM specific)$|\nInclude /etc/httpd/conf/extra/httpd-zoneminder.conf\n&|;    
    ' /etc/httpd/conf/httpd.conf > /etc/httpd/conf/httpd.conf.zoneminder
    
    cat << EOF
Note for mysql:
==> To run Zoneminder, you must install the database running mysql service (as root):
==> "rc.d start mysqld" (in initscripts) or "systemctl start mysqld.service" (in systemd)
==> and add Zoneminder database typing (with passsword):
==> "mysqladmin --defaults-file=/etc/mysql/my.cnf -p -f reload"
==> "cat /usr/share/zoneminder/db/zm_create.sql | mysql --defaults-file=/etc/mysql/my.cnf -p"
==> "echo 'grant lock tables, alter,select,insert,update,delete on zm.* to 'zmuser'@localhost identified by "zmpass";' | mysql --defaults-file=/etc/mysql/my.cnf -p mysql"
==> (or without passsword):
==> "mysqladmin --defaults-file=/etc/mysql/my.cnf -f reload"
==> "cat /usr/share/zoneminder/db/zm_create.sql | mysql --defaults-file=/etc/mysql/my.cnf"
==> "echo 'grant lock tables, alter,select,insert,update,delete on zm.* to 'zmuser'@localhost identified by "zmpass";' | mysql --defaults-file=/etc/mysql/my.cnf mysql"

Note for php:
==> You must uncomment that line in /etc/php/php.ini:
==> "extension=mysql.so"
==> check and make sure these are uncommented:
==> "extension=gd.so"
==> "extension=gettext.so"
==> "extension=mcrypt.so"
==> "extension=mysqli.so"
==> "extension=session.so"
==> "extension=sockets.so"
==> "extension=openssl.so"
==> "extension=ftp.so"
==> "extension=zip.so"
==> check and add to open_basedir "/etc" and
==> "/srv/http/zoneminder" like so
==> "open_basedir = /home:/tmp:/usr/share/pear:/etc:/srv/http/zoneminder"
==> and set your timezone in php.ini:
==> "date.timezone = <your_country>/<your_city>"

Note for apache:
==> You must edit /etc/httpd/conf/httpd.conf and add the line:
==> "LoadModule php5_module modules/libphp5.so"
==> and:
==> "Include /etc/httpd/conf/extra/php5_module.conf"
==> "Include /etc/httpd/conf/extra/httpd-zoneminder.conf"
EOF
}

post_upgrade() {
    post_install
    /usr/bin/zmupdate.pl -f >/dev/null
}

post_remove() {
    if [[ -d /tmp/zoneminder ]]; then
        rm -vr /tmp/zoneminder
    fi
    # sed -i -e '
    # /^open_basedir/ s/:\/srv\/http\/zoneminder//;
    # /^open_basedir/ s/:\/srv\/http\/zoneminder\///;
    # ' /etc/php/php.ini || read
    # sed -i -e '
    # /^# ZoneMinder/d;
    # /Include \/etc\/httpd\/conf\/extra\/httpd-zoneminder.conf/d;
    # ' /etc/httpd/conf/httpd.conf || read

    cat << EOF
Note:
==> To clean Zoneminder mysql database, run as root (with password):
==> "echo 'delete from user where User="zmuser";' | mysql --defaults-file=/etc/mysql/my.cnf -p mysql"
==> "echo 'delete from db where User="zmuser";' | mysql --defaults-file=/etc/mysql/my.cnf -p mysql"
==> "mysqladmin --defaults-file=/etc/mysql/my.cnf -p -f drop zm"
==> (or without password):
==> "echo 'delete from user where User="zmuser";' | mysql --defaults-file=/etc/mysql/my.cnf mysql"
==> "echo 'delete from db where User="zmuser";' | mysql --defaults-file=/etc/mysql/my.cnf mysql"
==> "mysqladmin --defaults-file=/etc/mysql/my.cnf -f drop zm"

==> Disable http with php if it isn't needed with others servers, 
==> comment or remove that lines in /etc/httpd/conf/httpd.conf:
==> "LoadModule php5_module modules/libphp5.so"
==> "Include /etc/httpd/conf/extra/php5_module.conf"

==> Remove line in /etc/httpd/conf/httpd.conf:
==> "Include /etc/httpd/conf/extra/httpd-zoneminder.conf"

==> Disable php with mysql if it isn't needed with others servers, 
==> comment that lines in /etc/php/php.ini:
==> "extension=mysql.so"
==> "extension=gd.so"
==> "extension=gettext.so"
==> "extension=mcrypt.so"
==> "extension=mysqli.so"
==> "extension=session.so"
==> "extension=sockets.so"
==> "date.timezone = <my_country>/<my_city>"

==> Edit /etc/php/php.ini and remove "/etc" and "/srv/http/zoneminder"
==> in the "open_basedir".

==> Remove log files and "zonemider" directory in "/var/log/zoneminder".

==> Backup and remove "events", "images" and "temp" dirs in "/var/cache/zoneminder".
EOF
}