#!/bin/sh -e

# Debian Postfix preinst
# LaMont Jones <lamont@debian.org>
# Modified to use debconf by Colin Walters <levanti@verbum.org>

# do we have debconf?
if [ -f /usr/share/debconf/confmodule ]; then
    . /usr/share/debconf/confmodule
    DEBCONF=true
else
    DEBCONF=
fi

dpkg_vers=$(dpkg --status dpkg | sed -n '/Version: /s/^Version: //p')
CONFIG=/etc/postfix/main.cf
MASTER=/etc/postfix/master.cf
POSTDROP=/usr/sbin/postdrop

compat_conversion_warning() {
    if [ -n "$DEBCONF" ]; then
	db_input medium postfix/compat_conversion_warning || true
	db_go || true
	db_get postfix/compat_conversion_warning
	if [ "$RET" = "false" ]; then
	    echo "aborting postfix install"
	    exit 1
	fi
    else
    	cat << EOF
This upgrade of postfix changes some default values in the configuration. As
part of this upgrade, the following will be changed: (1) chrooted components
will be changed from '-' to 'y' in master.cf, and (2) myhostname will be set
to a fully-qualified domain name if it is not already such.  The install will
be aborted if you do not allow the change.
EOF
	echo -n "Shall I make the change? "
	read line
	case ${line} in
	    [nN]*)	echo "aborting postfix install"
			exit 1;;
	    *)		;;
	esac
    fi
}

lmtp_retired_warning() {
    if [ -n "$DEBCONF" ]; then
	db_input medium postfix/lmtp_retired_warning || true
	db_go || true
	db_get postfix/lmtp_retired_warning
	if [ "$RET" = "false" ]; then
	    echo "aborting postfix install"
	    exit 1
	fi
    else
	cat << EOF
This upgrade of postfix drops the "lmtp" symlink, and your configuration
(master.cf) refers to it: lmtp was merged into smtp long ago.  The install
will be aborted if you do not allow the change.
EOF
	echo -n "Shall I make the change? "
	read line
	case ${line} in
	    [nN]*)	echo "aborting postfix install"
			exit 1;;
	    *)		;;
	esac
    fi
}

main_cf_conversion_warning() {
    if [ -n "$DEBCONF" ]; then
	db_input medium postfix/main_cf_conversion_warning || true
	db_go || true
	db_get postfix/main_cf_conversion_warning
	if [ "$RET" = "false" ]; then
	    echo "aborting postfix install"
	    exit 1
	fi
    else
    	cat << EOF
This upgrade of postfix changes where daemons are located, and your postfix
configuration explicitly specifies the old location.  The install will be
aborted if you do not allow the change.
EOF
	echo -n "Shall I make the change? "
	read line
	case ${line} in
	    [nN]*)	echo "aborting postfix install"
			exit 1;;
	    *)		;;
	esac
    fi
}

dynamicmaps_conversion_warning() {
    if [ -n "$DEBCONF" ]; then
	db_input medium postfix/dynamicmaps_conversion_warning || true
	db_go || true
	db_get postfix/dynamicmaps_conversion_warning
	if [ "$RET" != "false" ]; then
	    touch /var/spool/postfix/dynamicmaps_3.0_transition
	fi
    else
    	cat << EOF
Postfix version 3.0 changes how dynamic maps are delivered, and your
dynamicmaps.cf does not reflect that.  Accept this option to convert
dynamicmaps.cf to the version required for 3.0.
EOF
	echo -n "Shall I make the change? "
	read line
	case ${line} in
	    [nN]*)	;;
	    *)		touch /var/spool/postfix/dynamicmaps_3.0_transition;;
	esac
    fi
}

relay_restrictions_warning() {
    if [ -n "$DEBCONF" ]; then
	db_input medium postfix/relay_restrictions_warning || true
	db_go || true
	db_get postfix/relay_restrictions_warning
	if [ "$RET" != "false" ]; then
	    touch /var/spool/postfix/set_relay_restrictions
	fi
    else
    	cat << EOF
Postfix version 2.10 adds smtpd_relay_restrictions, to separate relaying
restrictions from recipient restrictions, and you have a non-default value
for smtpd_recipient_restrictions.

Failure to do this may result in deferred or bounced mail after the
upgrade.  Accept this option to set smtpd_relay_restrictions to
smtpd_recipient_restrictions.
EOF
	echo -n "Shall I make the change? "
	read line
	case ${line} in
	    [nN]*)	;;
	    *)		touch /var/spool/postfix/set_relay_restrictions;;
	esac
    fi
}

mydomain_warning() {
    if [ -n "$DEBCONF" ]; then
	db_fset postfix/mydomain_warning seen false
	db_input medium postfix/mydomain_warning || true
	db_go || true
	db_get postfix/mydomain_warning
	if [ "$RET" = "false" ]; then
	    echo "aborting postfix install"
	    exit 1
	fi
    else
	# no debconf, fall back
	cat << EOF
Postfix version 2.3.3-2 and later require changes in main.cf.
Specifically, mydomain must be specified, since hostname(2) is not
an FQDN.
EOF
	echo -n "Shall I make the change? "
	read line
	case ${line} in
	    [nN]*)	echo "aborting postfix install"
			exit 1
			;;
	esac
    fi
}

retry_warning() {
    if [ -n "$DEBCONF" ]; then
	db_fset postfix/retry_upgrade_warning seen false
	db_input medium postfix/retry_upgrade_warning || true
	db_go || true
	db_get postfix/retry_upgrade_warning
	if [ "$RET" = "false" ]; then
	    echo "aborting postfix install"
	    exit 1
	fi
    else
	# no debconf, fall back
	cat << EOF
Postfix version 2.4 requires that the retry service be added to master.cf
EOF
	echo -n "Shall I make the change? "
	read line
	case ${line} in
	    [nN]*)	echo "aborting postfix install"
			exit 1
			;;
	esac
    fi
}

tlsmgr_warning() {
    if [ -n "$DEBCONF" ]; then
	db_fset postfix/tlsmgr_upgrade_warning seen false
	db_input medium postfix/tlsmgr_upgrade_warning || true
	db_go || true
	db_get postfix/tlsmgr_upgrade_warning
	if [ "$RET" = "false" ]; then
	    echo "aborting postfix install"
	    exit 1
	fi
    else
	# no debconf, fall back
	cat << EOF
Postfix version 2.2 has changed the invocation of tlsmgr.
EOF
	echo -n "Shall I make the change? "
	read line
	case ${line} in
	    [nN]*)	echo "aborting postfix install"
			exit 1
			;;
	esac
    fi
}

kernel_version_warning() {
    if [ -n "$DEBCONF" ]; then
	db_fset postfix/kernel_version_warning seen false
	db_input low postfix/kernel_version_warning || true
	db_go || true
	db_get postfix/kernel_version_warning
    else
	cat << EOF
Postfix uses features that are not found in kernels prior to 2.6.  If you
proceeed with the installation, Postfix will not run.
EOF
	RET=false
    fi
    if [ "$RET" = "false" ]; then
	echo "Aborting postfix install"
	exit 1
    fi
}

(umask 022; mkdir -p /var/spool/postfix)

case "$1" in
    install)
	rm -f /var/spool/postfix/restart /var/spool/postfix/reload
	# workaround sendmail not unregistering itself...
	if [ -e /etc/suid.conf ] && [ -x /usr/sbin/suidunregister ]; then
	    if grep -q sendmail /etc/suid.conf; then
		/usr/sbin/suidunregister -s postfix /usr/sbin/sendmail
	    fi
	fi

	if [ -L /etc/postfix/postfix-script ]; then
		rm -f /etc/postfix/postfix-script
	fi

	;;

    upgrade)
	version=$2
	if [ -d /var/spool/postfix ] && [ -f /etc/postfix/main.cf ]; then
	    touch /var/spool/postfix/restart
	fi
	export LANG=C	# for the comparison of mail version...

	if [ -L /etc/postfix/postfix-script ]; then
		rm -f /etc/postfix/postfix-script
	fi

	# If user has not modified master/main.proto, move aside so new version
	# is installed (#991513)
        cmp -s /usr/share/postfix/main.cf.dist /etc/postfix/main.cf.proto && \
	    mv /etc/postfix/main.cf.proto /etc/postfix/main.cf.proto.old \
	    || echo "/etc/postfix/main.cf.proto modified, not updating."
        cmp -s /usr/share/postfix/master.cf.dist /etc/postfix/master.cf.proto && \
	    mv /etc/postfix/master.cf.proto /etc/postfix/master.cf.proto.old \
	    || echo "/etc/postfix/master.cf.proto modified, not updating."

	if grep -q '^tlsmgr[[:space:]]*fifo' $MASTER; then
	  tlsmgr_warning
	fi

	if dpkg --compare-versions $version lt 3.1.0-1; then
	    # check on compatibility warning issues and warn as appropriate.
	    # even default myhostname needs to be checked to make sure it has a '.'.
	    for dir in /etc/postfix $(postconf -hxn multi_instance_directories 2>/dev/null || true); do
		if [ ! -f "${dir}/main.cf" ] || dpkg --compare-versions $version lt 2.11; then
		    # Just assume that there are issues with the chroot status,
		    # since postconf -F didn't exist before 2.11
		    compat_conversion_warning
		    break
		fi
		SRV=$(postconf -c "$dir" -F '*/*/chroot'| sed -n '/ = -$/s/ =.*$//p')
		if [ -n "$SRV" ] || \
			postconf -c "$dir" -hx myhostname | grep -qv '\.'; then
		    compat_conversion_warning
		    break
		fi
	    done
	fi
	if [ -f /etc/postfix/main.cf ] && dpkg --compare-versions $version lt 3.0.4-5; then
	    # if daemon_directory is specifically set, and wrong, then we need
            # to fix it.
	    for dir in /etc/postfix $(postconf -hxn multi_instance_directories); do
		DD=$(postconf -c "$dir" -hxn daemon_directory)
		if [ "X${DD}" = X/usr/lib/postfix ]; then
		    main_cf_conversion_warning
		    break
		fi
	    done
	fi

	if dpkg --compare-versions $version lt 3.0.3-2; then
	    # If we still think that it's dict_tcp.so, then we need to convert.
	    DM=/etc/postfix/dynamicmaps.cf
	    if [ ! -f ${DM} ] || grep -q "/usr/lib/postfix/dict_tcp.so" ${DM}; then
		dynamicmaps_conversion_warning
	    fi
	fi

	if dpkg --compare-versions $version lt 2.10.0-2; then
	  RECIP=$(postconf -hx smtpd_recipient_restrictions 2>/dev/null || true)
	  DEFAULT="permit_mynetworks, reject_unauth_destination"
	  if [ "$RECIP" != "$DEFAULT" ]; then
	    # 2.10.0-1 is special because it was broken.  If they haven't fixed
	    # it themselves, deal with it.
	    if dpkg --compare-versions $version ge 2.10.0-1; then
	      if [ -n "$RECIP" ] && [ -z "$(postconf -n smtpd_relay_restrictions)" ]; then
		relay_restrictions_warning
	      fi
	    else
	      # if they have the default recipient_restrictions then no need to ask.
	      relay_restrictions_warning
	    fi
	  fi
	fi

	if ! grep -q '^retry[[:space:]]' $MASTER; then
	  retry_warning
	fi
	invoke-rc.d --quiet postfix stop || true
	;;

    abort-upgrade)
	if [ -f /etc/postfix/main.cf.proto.old ]; then
	  mv /etc/postfix/main.cf.proto.old /etc/postfix/main.cf.proto
	  echo "Restoring old /etc/postfix/main.cf.proto on failed upgrade."
	fi
	if [ -f /etc/postfix/master.cf.proto.old ]; then
	  mv /etc/postfix/master.cf.proto.old /etc/postfix/master.cf.proto
	  echo "Restoring old /etc/postfix/master.cf.proto on failed upgrade."
	fi
	;;

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

if [ install = "$1" -o upgrade = "$1" ]; then
    # cleanup after past mistakes.
    rm -f /usr/sbin/postconf.postfix
    dpkg-divert --package postfix-tls --remove \
	 --divert /usr/sbin/postconf.postfix \
		  /usr/sbin/postconf >/dev/null 2>/dev/null
fi

#DEBHELPER#