#! /bin/sh
# postinst maintainer script for zoneminder-db package

set -e

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

# Source the config file if exists
CONFIGFILE=/etc/zm/zm.conf
if [ -e $CONFIGFILE ]; then
    . $CONFIGFILE
fi

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
}

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="mysql"

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

# Do this when the package is installed, upgraded or reconfigured
if [ "$1" = "configure" ] || [ "$1" = "reconfigure" ]; then

    # Install sql database create file for dbconfig
    # (needed at first package installation)
    if [ ! -f /usr/share/dbconfig-common/data/zoneminder/install/mysql ]; then
        install -m 644 /usr/share/zoneminder/db/zm_create.sql \
          /usr/share/dbconfig-common/data/zoneminder/install/mysql
        # Remove unneeded sql requests
        # dbconfig will create the underlying database
        sed -i "/^ *CREATE DATABASE /d" \
          /usr/share/dbconfig-common/data/zoneminder/install/mysql
        sed -i "/^ *USE /d" \
          /usr/share/dbconfig-common/data/zoneminder/install/mysql
    fi

    # Symlink sql update files for dbconfig (needed when upgrading the package)
    for sqlfile in /usr/share/zoneminder/db/zm_update-*.sql; do
        lnk=`echo $sqlfile | sed "s/^\/usr\/share\/zoneminder\/db\/zm_update-\(.*\)\.sql/\1/"`
        if [ ! -L /usr/share/dbconfig-common/data/zoneminder/upgrade/mysql/$lnk ]; then
            ln -sf $sqlfile \
              /usr/share/dbconfig-common/data/zoneminder/upgrade/mysql/$lnk
        fi
    done || true

    # 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

    # Remove the password from debconf database
    test -z $ADMIN_PASSWORD || 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


    # 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

fi

# Do this every time the package is installed or upgraded
# Test for database presence to avoid failure of zmupdate.pl
if [ "$dbc_install" = "true" ] && [ "$1" = "configure" ]; then

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

    # Run the ZoneMinder update tool
    zmupdate.pl

fi

#DEBHELPER#

exit 0