#!/bin/sh
set -e

# Debian Postfix postinst
# LaMont Jones <lamont@debian.org>
# Based on debconf code by Colin Walters <walters@cis.ohio-state.edu>,
# and John Goerzen <jgoerzen@progenylinux.com>.

if [ "$1" = triggered ]; then
    [ -z "$DPKG_ROOT" ] || exit 0
    echo "Restarting postfix"
    if [ -d /run/systemd/system ]; then
	deb-systemd-invoke restart postfix.service >/dev/null || :
    else
	invoke-rc.d postfix restart || :
    fi
    exit
fi

. /usr/share/debconf/confmodule
. /usr/share/postfix/postinst.functions

myfqdn() {
    myhostname=$(hostname --fqdn 2>/dev/null || echo "")
    # If we don't have a name with a dot (which includes ""), then we have work.
    if [ $myhostname = ${myhostname%.*} ]; then
	# If it's empty, and we have /etc/hostname, try that.
	if [ -z $myhostname ] && [ -r /etc/hostname ]; then
	    myhostname=$(cat /etc/hostname)
	fi
	# If we are still lacking a domain component, then try resolv.conf.
	if [ $myhostname = ${myhostname%.*} ]; then
	    if [ -f /etc/resolv.conf ]; then
		# The resolver uses the last one found, and ignores the rest
		mydom=$(sed -n 's/^search[[:space:]]*\.*\([^[:space:]]*\).*/\1/p;s/^domain[[:space:]]*\.*\([^[:space:]]*\).*/\1/p' /etc/resolv.conf | tail -1)
		myhostname="$myhostname${mydom:+.${mydom%.}}"
	    else
		myhostname="$myhostname.UNKNOWN"
	    fi
	fi
    fi
    echo $myhostname
}

fset_all_changed() {
    db_fset postfix/main_mailer_type changed $1
    db_fset postfix/root_address changed $1
    db_fset postfix/destinations changed $1
    db_fset postfix/mailname changed $1
    db_fset postfix/relayhost changed $1
    db_fset postfix/mynetworks changed $1
    db_fset postfix/procmail changed $1
    db_fset postfix/mailbox_limit changed $1
    db_fset postfix/recipient_delim changed $1
    db_fset postfix/protocols changed $1
}

set_postconf() {
    CHANGES=true
    postconf -e "$@"
}

# postfix service is not started here (started in the trigger above)
#DEBHELPER#

case "$1" in
    configure)
	OLDVERSION="$2"
	# see below
	;;

    abort-upgrade)
	exit 0
	;;

    abort-remove|abort-deconfigure)
	exit 0
	;;

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

CHANGES=""

if dpkg --compare-versions "$OLDVERSION" lt-nl 3.9.0-3~
then
    # cyrus_sasl_config used to be hard-coded in debian to /etc/postfix/sasl.
    # Since 3.9.0-3 we switched to upstream default which is empty,
    # which means to use built-in Cyrus SASL library defaults.
    # Debian policy says it should be /etc/postfix/sasl
    if [ ! "$(postconf -hx cyrus_sasl_config_path)" ]; then
	postconf -e cyrus_sasl_config_path=/etc/postfix/sasl
    fi
fi

if dpkg --compare-versions "$OLDVERSION" lt-nl 3.9.1-7~
then
    [ ! -L /etc/postfix/makedefs.out ] ||
	rm -f /etc/postfix/makedefs.out

    # postfix forced statoverrides on every install. Remove unneeded one
    dpkg-statoverride --remove --quiet /var/spool/postfix/public || :

fi

if dpkg --compare-versions "$OLDVERSION" lt-nl 3.9.1-8~
then
    if dir=$(postconf -hx html_directory) && [ no = "$dir" ]; then
	postconf -e html_directory=/usr/share/doc/postfix/html
	postconf -\# html_directory
    fi
    if dir=$(postconf -hx readme_directory) && [ no = "$dir" ]; then
	postconf -e readme_directory=/usr/share/doc/postfix
	postconf -\# readme_directory
    fi
fi

if ! getent passwd postfix >/dev/null
then
    adduser --system --group --comment "Postfix MTA" \
	--home /var/spool/postfix --no-create-home postfix
fi

if ! getent group postdrop >/dev/null
then
    addgroup --system postdrop
fi

# postdrop is for 2 dirs and 2 executables.  Postfix will create
# subdirs in queue_directory with correct permissions.
set -- \
	root postdrop 02555 /usr/sbin/postdrop \
	root postdrop 02555 /usr/sbin/postqueue \
; while [ $# -ge 4 ]; do
    dpkg-statoverride --list $4 >/dev/null ||
	dpkg-statoverride --add --update $1 $2 $3 $4
    shift 4
done

if [ ! "$OLDVERSION" ] &&
   ! dpkg-statoverride --list /var/lib/postfix >/dev/null
then
    chown postfix:postfix /var/lib/postfix
fi

cd /etc/postfix

if [ ! -f dynamicmaps.cf ]; then
  echo "Creating /etc/postfix/dynamicmaps.cf"
  echo "# dict-type	so-name (pathname)	dict-function	mkmap-function" > dynamicmaps.cf
fi

db_get postfix/main_mailer_type && mailer="$RET"

[ -f master.cf ] || cp /usr/share/postfix/master.cf.dist master.cf

if [ "$mailer" != "No configuration" ]; then	# [
    if [ -f main.cf ]; then
	NEWCONF=""
    else
	cp /usr/share/postfix/main.cf.debian main.cf
	if [ -f /etc/ssl/private/ssl-cert-snakeoil.key ]; then
	    cat /usr/share/postfix/main.cf.tls >> main.cf
	fi
	postconf -e "smtpd_relay_restrictions=permit_mynetworks permit_sasl_authenticated defer_unauth_destination"
	NEWCONF=yes
    fi
fi	# !No configuration ]

run_newaliases=

if [ "$mailer" != "No configuration" ]; then	# [
    myhostname=$(myfqdn)
    mydomain=${myhostname#*.}

    if [ -n "$NEWCONF" ]; then
	fset_all_changed true
	alias_maps=hash:/etc/aliases
	nis_status=$(dpkg -l nis 2>/dev/null | sed -n '$p')
	if [ "X$nis_status" != "X${nis_status#i}" ] && which ypcat > /dev/null &&
		ypcat mail.aliases >/dev/null 2>&1; then
	    alias_maps="hash:/etc/aliases, nis:mail.aliases"
	    cat << EOF
It appears that you have an NIS map for mail aliases; using that in
addition to /etc/aliases.

EOF
	fi
	if [ -n "$myhostname" ]; then
	    echo "setting myhostname: $myhostname"
	    set_postconf "myhostname=$myhostname"
	fi
	echo "setting alias maps"
	set_postconf "alias_maps=$alias_maps"
	echo "setting alias database"
	set_postconf "alias_database=hash:/etc/aliases"
    else
	if [ -f /var/spool/postfix/mydomain-upgrade ]; then
	  rm -f /var/spool/postfix/mydomain-upgrade
	  db_get postfix/mydomain_upgrade && upgrade="$RET"
	  if [ "$upgrade" = "true" ]; then
	    echo "setting mydomain=$mydomain"
	    set_postconf "mydomain=$mydomain"
	  fi
	fi
    fi

    db_fget postfix/mailname changed
    if [ "$RET" = "true" ]; then
	db_get postfix/mailname && mailname="$RET"
	lcmailname="$(echo $RET| tr 'A-Z' 'a-z')"
	if [ "X$lcmailname" = "X==default==" ]; then
	    mailname=$(hostname --fqdn 2>/dev/null || echo localdomain)
	fi
	lcmailname="$(echo $mailname| tr 'A-Z' 'a-z')"
	if [ -f /etc/mailname ] && [ "X$(tr 'A-Z' 'a-z' < /etc/mailname)" = "X$lcmailname" ]; then
	    MAILNAME=""
	else
	    MAILNAME=yes
	fi
	if [ "X${lcmailname}" = Xubuntu.com ] || [ "X${lcmailname}" = Xdebian.org ]; then
	    echo "refusing to set mailname to ${mailname}."
	elif [ "X${mailname%.*}" != "X${mailname}" ]; then
	    if [ -n "$MAILNAME" ]; then
		echo "changing /etc/mailname to $mailname"
		echo $mailname > /etc/mailname
	    fi
	    echo "setting myorigin"
	    set_postconf "myorigin=/etc/mailname"
	else
	    echo "mailname is not a fully qualified domain name.  Not changing /etc/mailname."
	fi
    fi
    db_fget postfix/destinations changed
    if [ "$RET" = "true" ]; then
	db_get postfix/destinations && destinations="$RET"
	echo "setting destinations: $destinations"
	set_postconf "mydestination=$destinations"
    fi
    db_fget postfix/relayhost changed
    if [ "$RET" = "true" ]; then
	db_get postfix/relayhost && relayhost="$RET"
	echo "setting relayhost: $relayhost"
	set_postconf "relayhost=$relayhost"
    fi
    db_fget postfix/mynetworks changed
    if [ "$RET" = "true" ]; then
	db_get postfix/mynetworks && mynetworks="$RET"
	if [ -z "$RET" ]; then
	    echo "deleting mynetworks"
	    if grep -q '^mynetworks[[:space:]]*=' main.cf; then
		# need to remove it, get postconf to do the hard part.
		postconf -e 'mynetworks=127.0.0.0/8'
		sed -i -e '/^mynetworks\s*=/d' main.cf
	    fi
	else
	    echo "setting mynetworks: $mynetworks"
	    set_postconf "mynetworks=$mynetworks"
	fi
    fi
    db_fget postfix/procmail changed
    if [ "$RET" = "true" ]; then
	db_get postfix/procmail && useprocmail="$RET"
	if [ "x$useprocmail" = "xtrue" ]; then
	    echo "setting mailbox_command"
	    set_postconf 'mailbox_command=procmail -a "$EXTENSION"'
	else
	    if grep -q ^mailbox_command /etc/postfix/main.cf; then
		echo "clearing mailbox_command"
		set_postconf "mailbox_command="
	    fi
	fi
    fi
    db_fget postfix/mailbox_limit changed
    if [ "$RET" = "true" ]; then
	db_get postfix/mailbox_limit && mailbox_limit="$RET"
	echo "setting mailbox_size_limit: $mailbox_limit"
	set_postconf "mailbox_size_limit=$mailbox_limit"
    fi

    db_fget postfix/recipient_delim changed
    if [ "$RET" = "true" ]; then
	db_get postfix/recipient_delim && recip="$RET"
	echo "setting recipient_delimiter: $recip"
	set_postconf "recipient_delimiter=$recip"
    fi

    db_fget postfix/main_mailer_type changed
    if [ "$RET" = "true" ]; then
	# If the user has picked something other than smtp, keep it
	dtrans=$(postconf -hx default_transport)
	if [ $(postconf -hx default_transport) = error ]; then
	    dtrans=smtp
	fi
	# already have mailer
	case "$mailer" in
	    "Local only")	val=loopback-only; dtrans=error;;
	    "Satellite system")	val=loopback-only;;
	    *)			val=all;;
	esac
	echo "setting inet_interfaces: $val"
	set_postconf "inet_interfaces=$val"

	if [ $(postconf -hx default_transport) != $dtrans ]; then
	    echo "setting default_transport: $dtrans"
	    set_postconf "default_transport=$dtrans"
	    echo "setting relay_transport: $dtrans"
	    set_postconf "relay_transport=$dtrans"
	fi
    fi

    db_fget postfix/protocols changed
    if [ "$RET" = "true" ]; then
	db_get postfix/protocols && protocols="$RET"
	echo "setting inet_protocols: $protocols"
	set_postconf "inet_protocols=$protocols"
    fi

    if [ -z "$CHANGES" ]; then
	MSG="configuration was not changed"
    else
	if [ -n "$NEWCONF" ]; then
	    MSG="is now set up with a default configuration"
	else
	    MSG="is now set up with the changes above"
	fi
    fi

    add_root_alias=
    #XXX could use actual $alias_maps
    if [ ! -f /etc/aliases ]; then	## no /etc/aliases
	#XXX should actually create /etc/aliases on first install according to policy
	echo "/etc/aliases does not exist, creating it."
	cat <<-'EOF' > /etc/aliases
		# See man 5 aliases for format
		postmaster:    root
		EOF
	run_newaliases=y
    fi
    if ! grep -qs ^root: /etc/aliases &&	## if no root alias
       ! [ -f ~root/.forward ] ; then		## and no root .forward
	add_root_alias=y
    fi
    if [ "$add_root_alias" ]; then
	db_get postfix/root_address && root_addr="$RET"
	case "$RET" in
	    ([Nn][Oo][Nn][Ee] | "") ;;
	    (*) echo "Adding alias for root: $RET"
	        echo "root:	$RET" >> /etc/aliases
	        run_newaliases=y
	        ;;
	esac
    fi
    db_fget postfix/root_address changed
    if [ "$RET" = "true" ] && ! grep -q ^root: /etc/aliases; then
	echo "WARNING: /etc/aliases exists, but does not have a root alias."
    fi
    if [ ! "$OLDVERSION" ] && [ ! -f /etc/aliases.db ]; then #XXX $alias_database?
	run_newaliases=y
    fi

else	# ] No configuration [
    if [ -f main.cf ]; then
	MSG="configuration was not modified by debconf"
    else
	MSG="was not set up.  Start with
  cp /usr/share/postfix/main.cf.debian /etc/postfix/main.cf
"
    fi
fi	# not 'No configuration' ]

fset_all_changed false

fold -s << EOF

Postfix (main.cf) $MSG.  If you need to make changes, edit /etc/postfix/main.cf (and others) as needed.  To view Postfix configuration values, see postconf(1).

After modifying main.cf, be sure to run 'systemctl reload postfix'.

EOF

if dpkg --compare-versions "$OLDVERSION" lt-nl 3.9.1-7~ &&
   dirs=$(postconf -hx multi_instance_directories) &&
   [ -d /run/systemd/system ]
then # check for postfix@- multi-instances setup
    instances= outofconf=
    for dir in $dirs; do
	# previous system started only named instances
        name=$(postconf -c $dir -hx multi_instance_name 2>/dev/null) || continue
	[ -n "$name" ] || continue
	instances="$instances $name ($dir)"
	case "$dir" in
	    (/etc/postfix-*) ;;
	    ( * ) outofconf="$outofconf $name ($dir)" ;;
	esac
    done
    if [ -n "$instances" ]; then
	cat <<-EOF
	WARNING:
	WARNING: It looks like your system is running multiple postfix instances.
	WARNING: Since postfix package version 3.9.1-7 in Debian, this configuration
	WARNING: is done differently.  Your non-default instances will not be started
	WARNING: automatically by default.  The following non-default instance(s) has
	WARNING: been detected which were started before but will not anymore:
	WARNING:  $instances
	WARNING:
	EOF
	[ -z "$outofconf" ] || cat <<-EOF
	WARNING: Additionally, the following non-default instance(s) can not be managed
	WARNING: by the new startup scripts:
	WARNING:  $outofconf
	WARNING: In order for these instances to be managed by systemd automatically,
	WARNING: config directories should start with "/etc/postfix-", and each instance
	WARNING: has to be enabled separately as a systemd service.
	WARNING:
	EOF
	cat <<-EOF
	WARNING: Please read /usr/share/doc/postfix/README.Debian.gz, section about
	WARNING: multiple instances, for more information.
	WARNING:
	EOF
    fi
fi

if [ "$run_newaliases" ] && [ -n "$(postconf -hx alias_database)" ]; then
    if ! newaliases; then
	echo "WARNING: newaliases run were not successful."
	echo "WARNING: Please review and re-run if manually if needed."
    fi
fi

# all done with debconf here.
db_stop

dpkg-trigger --no-await /usr/lib/postfix # trigger restart (after dynamic maps are configured)