#! /bin/sh
# postinst script for cyrus-common
# Copyright (c) 2002 by Henrique de Moraes Holschuh
# Distributed under the GNU General Public License version 2
#
# see: dh_installdeb(1)

set -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/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'.

export PATH=/sbin:/usr/sbin:/bin:/usr/bin

# Source debconf library.
. /usr/share/debconf/confmodule

CONF="/etc/imapd.conf"
CYRUS_CONFIG_DIR="/var/lib/cyrus"
[ -r /etc/default/cyrus-imapd ] && . /etc/default/cyrus-imapd

getconf () {
    if [ -r "${CONF}" ]; then
	confvalue=$(sed --silent -e "/^[[:blank:]]*${1}:/ { \
	s#^[[:blank:]]*${1}:[[:blank:]]*## \
	p
	}" < "${CONF}" | head -1)
	result=${confvalue:-$2}
    else
	result=${2}
    fi
}

upgradesieve () {
    if [ -z "$1" ] || $(dpkg --compare-versions $1 gt 3~); then
        return
    fi

    CYRUS_SIEVE_DIR="/var/spool/sieve"
    getconf sievedir ${CYRUS_SIEVE_DIR}
    CYRUS_SIEVE_DIR=$result
    find ${CYRUS_SIEVE_DIR} -type d -regextype sed -regex '.*/[^/]\+^[^/]\+' -print | awk '{system("mv " $0 " " gensub("\\^", ".", "g", $1))}'
    su cyrus -c '/usr/lib/cyrus/upgrade/masssievec /usr/lib/cyrus/bin/sievec'
}

case "$1" in
    configure)
	# Refuse to update if previous version is lower than 3.2.6-2+deb11u2~
    	if [ -z "$1" ] || $(dpkg --compare-versions $1 lt '3.2.6-2+deb11u2~'); then
    	    echo "You must update cyrus-imapd to at least version 3.2.6-2+deb11u2~" >&2
	    echo "before updating it to version 3.6.x and run it, else your mailboxes" >&2
	    echo "may be corrupted" >&2
	    exit 1
    	fi
	# Add the cyrus user (requires adduser >= 3.34)
	echo "Creating/updating cyrus user account..."
	adduser --quiet --system --ingroup mail --home /var/spool/cyrus \
           --shell /bin/sh --no-create-home --disabled-password --disabled-login \
	   --gecos "Cyrus Mailsystem User"  cyrus >/dev/null || {
	   if getent passwd | grep -s -q -E '^cyrus:'; then
		   echo "Non-system user cyrus found. I will not overwrite a non-system" >&2
		   echo "user. Remove the user and reinstall cyrus-common." >&2
		   exit 1
	   fi
	   # unknown adduser error, simply exit
	   exit 1
	}

	# Force correct owner and modes
	dpkg-statoverride --list /var/lib/cyrus >/dev/null 2>&1 ||
		dpkg-statoverride --update --add cyrus mail 750 /var/lib/cyrus
	dpkg-statoverride --list /var/spool/cyrus >/dev/null 2>&1 ||
		dpkg-statoverride --update --add cyrus mail 755 /var/spool/cyrus
	dpkg-statoverride --list /var/spool/sieve >/dev/null 2>&1 ||
	    dpkg-statoverride --update --add cyrus mail 755 /var/spool/sieve

	# Remove old statoverrides
	if dpkg-statoverride --list /var/run/cyrus >/dev/null 2>&1; then
	    dpkg-statoverride --update --remove /var/run/cyrus;
	fi
	if dpkg-statoverride --list /var/run/cyrus/socket >/dev/null 2>&1; then
	    dpkg-statoverride --remove /var/run/cyrus/socket;
	fi

	# Add user cyrus to group SASL, if such group exists
	adduser cyrus sasl || true

	if [ -z "$2" ]; then
	    echo -n "cyrus-common: Creating cyrus-imapd directories..."
            cyrus makedirs --cleansquat
	    echo "done."
	fi

        # Add USERDENY database if doesn't exist
        getconf configdirectory ${CYRUS_CONFIG_DIR}
        CYRUS_CONFIG_DIR=$result

        userdeny_database="${CYRUS_CONFIG_DIR}/user_deny.db"
        if [ ! -e ${userdeny_database} ]; then
	    echo -n "cyrus-common: Creating empty user_deny database..."
            touch ${userdeny_database}
            chmod 600 ${userdeny_database}
            chown cyrus:mail ${userdeny_database}
	    echo "done."
        fi	    

     	if [ -f /usr/lib/cyrus/cyrus-db-types.active ]; then
	    /usr/lib/cyrus/bin/upgrade-db
	    RET="$?"
	    case "$RET" in
		0) ;;
		2)
		    echo "ERROR: Upgrading of database backends failed." 1>&2
		    echo "ERROR: Please check the output, fix errors and re-run /usr/lib/cyrus/bin/upgrade-db" 1>&2
		    echo "ERROR: script, before trying to start cyrus-imapd." 1>&2
		    ;;
		1|*)
		    echo "ERROR: Upgrading of database backends failed with a fatal error." 1>&2
		    echo "ERROR: Please check /usr/share/doc/cyrus-common/README.Debian*" 1>&2
		    echo "ERROR: for instructions how to upgrade cyrus databases manually." 1>&2
		    exit $RET;
		    ;;
	    esac
	fi

	# Legacy code / needed in case something will change in future
	# Hopefully this will be handled by upstream next time
	cp -p /usr/lib/cyrus/cyrus-hardwired-config.txt \
	    /usr/lib/cyrus/cyrus-hardwired-config.active

	upgradesieve $2
    ;;

    abort-upgrade|abort-remove|abort-deconfigure)
    ;;

    *)
        echo "postinst called with unknown argument \`$1'" >&2
        exit 0
    ;;
esac

# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.

#DEBHELPER#

exit 0
