#!/bin/sh

set -e
. /usr/share/debconf/confmodule

if [ -n "$EX4DEBUG" ]; then
  echo "now debugging $0 $@"
  set -x
fi

db_version 2.0

BDBVERSION=5.3

case "$1" in
  configure)

	if ! getent passwd Debian-exim > /dev/null ; then
	  echo 'Adding system-user for exim (v4)' 1>&2
	  adduser --system --group --quiet --home /var/spool/exim4 \
	    --no-create-home --disabled-login --force-badname Debian-exim
	fi
	# Create directories for log etc
	# install also fixes permissions.
	install -d -oDebian-exim -gadm -m2750 /var/log/exim4
	install -d -oDebian-exim -gDebian-exim -m750 /run/exim4
	install -d -oDebian-exim -gDebian-exim -m750 /var/spool/exim4
	install -d -oDebian-exim -gDebian-exim -m750 /var/spool/exim4/db \
		/var/spool/exim4/input /var/spool/exim4/msglog

	# fix permissions on upgrades
	if dpkg --compare-versions "$2" le "4.30-1" ; then
		find /var/log/exim4 /var/spool/exim4 -group mail \
			\( -type f -or -type d \) -print0 | \
			xargs -0r chgrp Debian-exim
		find /var/log/exim4 /var/spool/exim4 -user mail \
			\( -type f -or -type d \) -print0 | \
			xargs -0r chown Debian-exim
	fi
	
	# Paranoia check: On any db upgrade throw away hints
	# databases.
	if test -r /var/lib/exim4/berkeleydbvers.txt ; then
		OLDBDB=`head -n1 /var/lib/exim4/berkeleydbvers.txt`
	else
		OLDBDB="unknown"
	fi
	if [ "$BDBVERSION" != "$OLDBDB" ] ; then
		echo exim: DB upgrade, deleting hints-db 1>&2
		rm -f /var/spool/exim4/db/misc-* /var/spool/exim4/db/wait-* \
			/var/spool/exim4/db/callout* \
			/var/spool/exim4/db/retry* \
			/var/spool/exim4/db/ratelimit* \
			/var/spool/exim4/db/__db.retry \
			/var/spool/exim4/db/__db.misc* \
			/var/spool/exim4/db/__db.callout \
			/var/spool/exim4/db/__db.ratelimit \
			/var/spool/exim4/db/__db.wait* \
			/var/spool/exim4/db/log.*
		echo "$BDBVERSION" > /var/lib/exim4/berkeleydbvers.txt
	fi
	# Check that db files are readable by this Exim's db library
	dbfiles=""
	for f in /var/spool/exim4/db/misc-* /var/spool/exim4/db/wait-* \
	         /var/spool/exim4/db/callout* /var/spool/exim4/db/retry* \
		 /var/spool/exim4/db/ratelimit* ; do
	    if [ -f "$f" ]; then
		if echo $f | grep \.lockfile\$ >/dev/null 2>&1; then
		    : # ignore lock files
		else
		    dbfiles="$dbfiles $(basename $f)"
		fi
	    fi
	done
	for dbfile in $dbfiles; do
	    if exim_dumpdb /var/spool/exim4 $dbfile >/dev/null 2>&1; then
		: # File OK
	    else
		echo "Resetting invalid $dbfile hints db" 1>&2
		rm -f /var/spool/exim4/db/$dbfile \
			/var/spool/exim4/db/$dbfile.* \
			/var/spool/exim4/db/__db.${dbfile}.* \
			/var/spool/exim4/db/log.*
	    fi
	done

       if [ -x "/etc/init.d/exim4" ]; then
           update-rc.d exim4 defaults >/dev/null
       fi

	# honor dpkg-statoverride settings for files not managed with dpkg
	for pat in /var/\*/exim4 /var/\*/exim4/\*; do
		[ $EX4DEBUG ] && eval echo "evaluate statoverride $pat"
		eval dpkg-statoverride --list $pat | while read USER GROUP MODE FILE; do
			[ $EX4DEBUG ] && echo "statoverride $USER $GROUP $MODE $FILE"
			chown ${USER}:${GROUP} $FILE
			chmod $MODE $FILE
		done
	done
	;;
esac