#!/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

dynamicmaps_warning() {
    if [ -n "$DEBCONF" ]; then
	db_fset postfix/dynamicmaps_upgrade_warning seen false
	db_input medium postfix/dynamicmaps_upgrade_warning || true
	db_go || true
	db_get postfix/dynamicmaps_upgrade_warning
	if [ "$RET" = "false" ]; then
	    echo "aborting postfix install"
	    exit 1
	fi
    else
	# no debconf, fall back
	cat << EOF
Postfix version 2.0.2 and later require changes in dynamicmaps.cf.
Specifically, wildcard support is gone, and with it %s expansion.  Any
changes that you made to dynamicmaps.cf that relied on these features will
need to be fixed by you.  Failure to correct these will result in a broken
mailer.
EOF
	echo -n "Shall I make the changes? "
	read line
	case ${line} in
	    [nN]*)	echo "aborting postfix install"
			exit 1
			;;
	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 ${line} in
	    [nN]*)	echo "aborting postfix install"
			exit 1
			;;
	esac
    fi
}
tlsmgr_warning() {
    if [ -n "$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
}

nqmgr_warning() {
    if [ -n "$DEBCONF" ]; then
	db_fset postfix/nqmgr_upgrade_warning seen false
	db_input medium postfix/nqmgr_upgrade_warning || true
	db_go || true
	db_get postfix/nqmgr_upgrade_warning
	if [ "$RET" = "false" ]; then
	    echo "aborting postfix install"
	    exit 1
	fi
    else
	# no debconf, fall back
	cat << EOF
Postfix version 2.1 has renamed nqmgr to qmgr.
EOF
	echo -n "Shall I make the change? "
	read line
	case ${line} in
	    [nN]*)	echo "aborting postfix install"
			exit 1
			;;
	esac
    fi
}

master_warning() {
    if [ -n "$DEBCONF" ]; then
	db_fset postfix/master_upgrade_warning seen false
	db_input medium postfix/master_upgrade_warning || true
	db_go || true
	db_get postfix/master_upgrade_warning
	if [ "$RET" = "false" ]; then
	    echo "aborting postfix install"
	    exit 1
	fi
    else
	# no debconf, fall back
	cat << EOF
Postfix version 2.1 and later require new services in master.cf.
EOF
	echo -n "Shall I make the changes? "
	read line
	case ${line} in
	    [nN]*)	echo "aborting postfix install"
			exit 1
			;;
	esac
    fi
}

transport_map_warning() {
    if [ -n "$DEBCONF" ]; then
	db_input critical postfix/transport_map_warning || true
	db_go || true
    else
	# no debconf, fall back
	cat << EOF
You have a transport map defined, and there is an incompatible change
in how transport maps are used.  Postfix will not be restarted
automatically.

Transport map entries override mydestination.  If you use transport
maps, it is better to always have explicit entries for all domain
names you have in \$mydestination.  See the html/faq.html sections
for firewalls and intranets.

If you have transport entries for parent domains of anything delivered
locally, you will probably need to add specific entries for the
destination domains before you restart Postfix.
EOF
	echo -n "Press [ENTER] "
	read line
    fi
    # don't automatically restart postfix now
    rm -f /var/spool/postfix/restart
}

db_upgrade_warning() {
    if [ -n "$DEBCONF" ]; then
	db_fset postfix/db_upgrade_warning seen false
	db_input low postfix/db_upgrade_warning || true
	db_go || true
	db_get postfix/db_upgrade_warning
    #else
	# deal with it in postinst
    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 dpkg --compare-versions $version lt 0.0.19991231; then
	  if [ -f $CONFIG ] && [ -n "$(postconf -h transport_maps)" ]; then
	    transport_map_warning
	  fi
	fi

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

	if dpkg --compare-versions $version lt 0.0.20001217.SNAPSHOT-4; then
	  if dpkg --compare-versions $dpkg_vers ge 1.8 &&
	     [ -x /usr/sbin/addgroup ]; then
	    # was postdrop setgid before?  If so, add the override.
	    set -- $(ls -l $POSTDROP)
	    sgid=${1#??????}
	    if [ "${sgid%???}" = "s" ]; then
	      if ! chgrp postdrop $POSTDROP 2>/dev/null; then
		addgroup postdrop || true
	      fi
	      dpkg-statoverride --remove $POSTDROP >/dev/null 2>&1 || true
	      dpkg-statoverride --add root postdrop 02555 $POSTDROP
	    fi
	  fi
	fi

	if dpkg --compare-versions $version lt 2.0.7-4; then
	  # are there any maps that need to be converted?
	  # Likewise, if there's no config, then there is nothing to
	  # upgrade...
	  if [ -f $CONFIG ]; then
	    maps=$(postconf -h | tr ' ,\11' '\12\12\12' | sort -u |
		    grep -e hash: -e btree: || true)
	    if [ -n "$maps" ]; then
	      touch /var/spool/postfix/db-upgrade
	      db_upgrade_warning
	    fi
	  fi
	fi

	# Don't care what version it was, nqmgr is gone (until
	# it's back again..)
	if grep -q '^qmgr.*nqmgr' $MASTER; then
	  nqmgr_warning
	fi
	sed '/^qmgr[[:space:]]/s/nqmgr/qmgr/' $MASTER > ${MASTER}.$$
	cp ${MASTER}.$$ $MASTER && rm ${MASTER}.$$

	if dpkg --compare-versions $version lt 2.1.3-1; then
	  oldsum=$(dpkg --status postfix | sed -n '/\/master.cf/s/^.* //p')
	  filesum=$(md5sum < $MASTER)
	  if [ "$oldsum" != "$filesum" ]; then
	    master_warning
	  fi
	fi

	if dpkg --compare-versions $version lt 2.0.2-3; then
	  oldsum=$(dpkg --status postfix | sed -n '/\/dynamicmaps.cf/s/^.* //p')
	  if [ -n "$oldsum" ]; then	# not a config file any more.
	    dynamicmaps_warning
	    touch /var/spool/postfix/dynamicmaps_upgrade
	  fi
	else
	    rm -f /var/spool/postfix/dynamicmaps_upgrade
	fi

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

	if dpkg --compare-versions $version lt 2.3.5-1; then
	  # droping 10hostname.dpatch forces cleanup.
	  if [ -z "$(postconf -n mydomain 2>/dev/null || true)" ]; then
	    myhost=$(hostname)
	    if [ "X${myhost%.*}" = "X${myhost}" ]; then
	      mydomain_warning
	      touch /var/spool/postfix/mydomain-upgrade
	    fi
	  fi
	fi
	invoke-rc.d --quiet postfix stop || true
	;;

    abort-upgrade)
	;;

    *)
	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#