#!/bin/sh -e

# summary of how this script can be called:
#        * <postinst> `configure' <most-recently-configured-version>
#        * <old-postinst> `abort-upgrade' <new version>
#        * <conflictor's-postinst> `abort-remove' `in-favour' <package> <new-version>
#        * <deconfigured's-postinst> `abort-deconfigure' `in-favour'
#          <failed-install-package> <version> `removing'
#          <conflicting-package> <version>
# for details, see /usr/share/doc/packaging-manual/
#
# quoting from the policy:
#     Any necessary prompting should almost always be confined to the
#     post-installation script, and should be protected with a conditional
#     so that unnecessary prompting doesn't happen if a package's
#     installation fails and the `postinst' is called with `abort-upgrade',
#     `abort-remove' or `abort-deconfigure'.


ETC_DIR="/etc/proftpd"
CONF=$ETC_DIR/proftpd.conf
CONF_NEW=$ETC_DIR/proftpd.conf.proftpd-new
MODULES=$ETC_DIR/modules.conf
MODULES_NEW=$ETC_DIR/modules.conf.proftpd-new

installftp()
{
	if ! grep -q "^ftp:" /etc/passwd
	then
	    adduser --system ftp --home /srv/ftp || true
            if [ -f /usr/share/proftpd/templates/welcome.msg -a -d ~ftp ] ; then
                cp -p -v /usr/share/proftpd/templates/welcome.msg ~ftp/welcome.msg.proftpd-new || true
                do_update ~ftp/welcome.msg || true
	    fi
	fi
}

add_sysuser()
{
	if ! grep -q "^proftpd:" /etc/passwd
	then
		adduser --system --disabled-login --no-create-home --home /run/proftpd proftpd || true
	else
		usermod --home=/run/proftpd proftpd || true
	fi
}

list_options()
{
    if [ -f $CONF_NEW ] ; then
	sed -i -e "s/lsdefaultoptions/ListOptions/i" $CONF_NEW 
    fi
}

tcpwin_options()
{
    if [ -f $CONF_NEW ] ; then
        sed -i -e "s/tcpreceivewindow/SocketOptions rcvbuf/i" \
            -e "s/tcpsendwindow/SocketOptions sndbuf/i" $CONF_NEW 
    fi
}
                                                                                         
scoreboard()
{
    if [ -f $CONF_NEW ] ; then
        sed -i -e "s/\(scoreboardpath.*\)/#\n#ScoreboardPath is deprecated in 1.2.9, use ScoreboardFile instead\n#\1\n#\n#ScoreboardFile\t\/run\/proftpd\/proftpd.scoreboard\n#/i" \
                                                $CONF_NEW 
    fi
}

include_modules()
{
    if [ -f $CONF_NEW ] ; then
	if ! egrep -qi "^[[:space:]]*Include.*/etc/proftpd/modules.conf" $CONF_NEW ; then
		printf "#\n# Includes required DSO modules. This is mandatory in proftpd 1.3\n#\nInclude\t/etc/proftpd/modules.conf\n\n" >$CONF_NEW.tmp.$$
		cat $CONF_NEW >>$CONF_NEW.tmp.$$
		mv -f $CONF_NEW.tmp.$$ $CONF_NEW
	fi
    fi
}

replace_file () {
    file=$1
    if [ ! -f ${file} ] ; then
	mv ${file}.proftpd-new ${file}
    else
	cp $file ${file}.proftpd-old
	ucf --debconf-ok ${file}.proftpd-new $file 
    fi
}

do_update () {
    file=$1
    if diff -q ${file} ${file}.proftpd-new >/dev/null 2>&1; then
	# Old file and new file are identical
	rm -f ${file}.proftpd-new
    else
	replace_file $file
    fi
}

disable_script () {
	file=$1
	if [ -x ${file} ]; then
			cp ${file} ${file}.disabled
			cat >${file}.disabled <<EOF
#!/bin/sh
# This script has been disabled at upgrade time

exit 0

EOF
			cat ${file} >>${file}.disabled
			rm -f ${file}
	fi
}

. /usr/share/debconf/confmodule

# update-ined is used if found, else you are on your own
if [ ! -z `which update-inetd` ]; then
    UPDATE_INETD=update-inetd
else
    UPDATE_INETD=/bin/true
fi

if [ "$1" = "configure" ]; then
    
    # mv eventual old configuration in the new location
    if [ -f /etc/proftpd.conf -a ! -f $CONF ]; then
    	mv /etc/proftpd.conf $CONF
    fi
    
    # use current configuration files or generate new ones from scratch
    for name in proftpd modules sql ldap tls virtuals
    do
      if [ ! -f $ETC_DIR/$name.conf ]; then
          cp  /usr/share/proftpd/templates/$name.conf $ETC_DIR/$name.conf.proftpd-new
      else
          cp  $ETC_DIR/$name.conf $ETC_DIR/$name.conf.proftpd-new
      fi
    done
    
    # update-inetd does not manage hostlist prefix to service, at least avoid to add a duplicated line
    if [ -f /etc/inetd.conf -a $(grep -qs '^([[:alnum:],.]+)?:?ftp[[:space:]]+' /etc/inetd.conf|wc -l) -eq 0 ]; then
    	$UPDATE_INETD --group STANDARD --add '#<off># ftp	stream	tcp	nowait	root /usr/sbin/tcpd /usr/sbin/proftpd' 
    fi

    add_sysuser
    installftp

    # do mandatory changes
    list_options
    tcpwin_options
    scoreboard
    include_modules

	# disable old cron jobs if needed
	disable_script /etc/cron.monthly/proftpd
	disable_script /etc/cron.monthly/proftpd-basic

    # propose maintainer changes to user
    do_update /etc/proftpd/proftpd.conf
    do_update /etc/proftpd/modules.conf
    do_update /etc/proftpd/tls.conf
    do_update /etc/proftpd/sql.conf
    do_update /etc/proftpd/ldap.conf
    do_update /etc/proftpd/virtuals.conf

	# be safe and change permissions for .conf files where passwords should
	# potentially be present
	chmod 600 /etc/proftpd/sql.conf* /etc/proftpd/ldap.conf* || true

    # clean run files (pidfile and scoreboard)
    rm -f /run/proftpd/proftpd* /run/proftpd.pid 

fi

if [ -e "/etc/init.d/proftpd" ]; then
    update-rc.d proftpd defaults >/dev/null
    set +e 
    proftpd -t >/dev/null 2>&1
    if [ $? = 0 ]; then
	set -e
	invoke-rc.d proftpd start || true
    else
	echo "Cannot start proftpd, please check syntax of your configuration file $CONF"
    fi
fi