#! /bin/sh
# postinst maintainer script for zoneminder

set -ex

# Source the debconf stuff
. /usr/share/debconf/confmodule

CONFIGFILE=/etc/zm/zm.conf

apache_install() {
    mkdir -p /etc/apache2/conf-available
    ln -sf ../../zm/apache.conf /etc/apache2/conf-available/zoneminder.conf

    COMMON_STATE=$(dpkg-query -f '${Status}' -W 'apache2.2-common' 2>/dev/null | awk '{print $3}' || true)

    if [ -e /usr/share/apache2/apache2-maintscript-helper ] ; then
        . /usr/share/apache2/apache2-maintscript-helper
        apache2_invoke enconf zoneminder
    elif [ "$COMMON_STATE" = "installed" ] || [ "$COMMON_STATE" = "unpacked" ] ; then
        [ -d /etc/apache2/conf.d/ ] && [ ! -L /etc/apache2/conf.d/zoneminder.conf ] && ln -s ../conf-available/zoneminder.conf /etc/apache2/conf.d/zoneminder.conf
    fi

    # Enable CGI script module in apache (not enabled by default on jessie)
    a2enmod cgi >/dev/null 2>&1

    # Reload the web server
    deb-systemd-invoke reload apache2.service || true
}

mysql_update() {

    # Source the dbconfig stuff
    . /usr/share/dbconfig-common/internal/mysql

    # Update the password of the hard-coded default 'admin' account
    test -z $ADMIN_PASSWORD || dbc_mysql_exec_command "UPDATE Users SET Password = password('$ADMIN_PASSWORD') WHERE Username = 'admin';" || true

    # Update the database version
    dbc_mysql_exec_command "UPDATE Config SET Value = '$DB_VERSION' WHERE Name = 'ZM_DYN_DB_VERSION';" || true
}

# Exit if user didn't want to use debconf
db_get zoneminder/debconf_install
if [ "$RET" = "false" ]; then
  # Reset the answer otherwise we are stuck here if the user choose to not use
  # debconf at first install (the question is not asked when reconfiguring)
  db_reset zoneminder/debconf_install
  exit 0
fi

# Source the config file if exists
[ ! -e $CONFIGFILE ] && exit 0
. $CONFIGFILE

if [ -f /usr/share/dbconfig-common/dpkg/postinst ]; then

    # Set the first version in which dbconfig-common was introduced in the package
    dbc_first_version="1.28.0"

    # Set the database type
    dbc_dbtypes="$ZM_DB_TYPE"

    # Source the dbconfig-common stuff
    . /usr/share/dbconfig-common/dpkg/postinst
fi

if [ "$1" = "configure" ] || [ "$1" = "reconfigure" ]; then

    # Create the underlying database and populate it
    # dbconfig will take care of applying any updates which are newer than the
    # previously installed version
    dbc_go zoneminder $@

    # Get the password of ZoneMinder user 'admin' from debconf
    db_get zoneminder/admin_password
    ADMIN_PASSWORD=$RET
    db_reset zoneminder/admin_password || true

    # Get the lastest database version from dbconfig upgrade folder
    DB_VERSION=$(ls -rv /usr/share/dbconfig-common/data/zoneminder/upgrade/$dbc_dbtypes | head -1)

    # Update the default admin account and database version
    mysql_update

    # Retrieve data from dbconfig (inputs from user)
    . /etc/dbconfig-common/zoneminder.conf

    # ZoneMinder config file handling
    # Inspired by: http://manpages.debian.org/cgi-bin/man.cgi?query=debconf-devel&sektion=7

    # Backup the config file
    cp -a -f $CONFIGFILE ${CONFIGFILE}.postinst.bak

    # Redeclare variables if missing in config file
    test -z $dbc_dbserver || grep -Eq "^ *ZM_DB_HOST=" $CONFIGFILE \
      || echo "ZM_DB_HOST=" >> ${CONFIGFILE}.postinst.bak
    test -z $dbc_dbname || grep -Eq "^ *ZM_DB_NAME=" $CONFIGFILE \
      || echo "ZM_DB_NAME=" >> ${CONFIGFILE}.postinst.bak
    test -z $dbc_dbuser || grep -Eq "^ *ZM_DB_USER=" $CONFIGFILE \
      || echo "ZM_DB_USER=" >> ${CONFIGFILE}.postinst.bak
    test -z $dbc_dbpass || grep -Eq "^ *ZM_DB_PASS=" $CONFIGFILE \
      || echo "ZM_DB_PASS=" >> ${CONFIGFILE}.postinst.bak

    # Prevent ZM_DB_HOST to be empty if user selected the 'unix socket' method
    if test -z $dbc_dbserver; then
        dbc_dbserver_override="localhost"
    else
        dbc_dbserver_override=$dbc_dbserver
    fi

    # Update variables in config file
    sed -i "s/^ *ZM_DB_HOST=.*/ZM_DB_HOST=$dbc_dbserver_override/" \
      ${CONFIGFILE}.postinst.bak
    test -z $dbc_dbname || sed -i "s/^ *ZM_DB_NAME=.*/ZM_DB_NAME=$dbc_dbname/" \
      ${CONFIGFILE}.postinst.bak
    test -z $dbc_dbuser || sed -i "s/^ *ZM_DB_USER=.*/ZM_DB_USER=$dbc_dbuser/" \
      ${CONFIGFILE}.postinst.bak
    test -z $dbc_dbpass || sed -i "s/^ *ZM_DB_PASS=.*/ZM_DB_PASS=$dbc_dbpass/" \
      ${CONFIGFILE}.postinst.bak

    # Clean-up backup file
    mv -f ${CONFIGFILE}.postinst.bak $CONFIGFILE

    # Set some file permissions
    chown $ZM_WEB_USER:$ZM_WEB_GROUP /var/log/zm
    chown $ZM_WEB_USER:$ZM_WEB_GROUP /var/lib/zm
    if [ -z "$2" ]; then
        chown $ZM_WEB_USER:$ZM_WEB_GROUP -R /var/cache/zoneminder
    fi
    # As requested by the Debian Webapps Policy Manual §3.2.1
    chown root:$ZM_WEB_GROUP /etc/zm/zm.conf
    chmod 640 /etc/zm/zm.conf

    # Configure the web server
    db_get zoneminder/webserver
    webservers="$RET"

    for webserver in $webservers; do
        webserver=${webserver%,}
        # Currently we only support apache2
        if [ "$webserver" = "apache2" ] ; then
            apache_install $1
        fi
    done
fi

if [ "$1" = "configure" ]; then

    # Ensure zoneminder is stopped
    deb-systemd-invoke stop zoneminder.service || exit $?

    # If mysql server exists and is running
    if [ -e "/usr/sbin/mysqld" ] && deb-systemd-invoke start mysql.service; then
        # Run the ZoneMinder update tool
        zmupdate.pl
    else
        # Otherwise exit without error (mysql server may not be available on
        # this machine)
        exit 0;
    fi
fi

#DEBHELPER#

exit 0