#!/bin/sh
# ctdb event script for Samba

[ -n "$CTDB_BASE" ] || \
    CTDB_BASE=$(d=$(dirname "$0") ; cd -P "$d" ; dirname "$PWD")

. "${CTDB_BASE}/functions"

detect_init_style

case $CTDB_INIT_STYLE in
	suse)
		CTDB_SERVICE_SMB=${CTDB_SERVICE_SMB:-smb}
		CTDB_SERVICE_NMB=${CTDB_SERVICE_NMB:-nmb}
		;;
	debian)
		CTDB_SERVICE_SMB=${CTDB_SERVICE_SMB:-smbd}
		CTDB_SERVICE_NMB=${CTDB_SERVICE_NMB:-nmbd}
		;;
	*)
		# Use redhat style as default:
		CTDB_SERVICE_SMB=${CTDB_SERVICE_SMB:-smb}
		CTDB_SERVICE_NMB=${CTDB_SERVICE_NMB:-""}
		;;
esac

# service_name is used by various functions
# shellcheck disable=SC2034
service_name="samba"

loadconfig

service_state_dir=$(ctdb_setup_service_state_dir) || exit $?

service_start ()
{
    # make sure samba is not already started
    service "$CTDB_SERVICE_SMB" stop > /dev/null 2>&1
    if [ -n "$CTDB_SERVICE_NMB" ] ; then
	service "$CTDB_SERVICE_NMB" stop > /dev/null 2>&1
    fi
    killall -0 -q smbd && {
	sleep 1
	# make absolutely sure samba is dead
	killall -q -9 smbd
    }
    killall -0 -q nmbd && {
	sleep 1
	# make absolutely sure samba is dead
	killall -q -9 nmbd
    }

    # start Samba service. Start it reniced, as under very heavy load
    # the number of smbd processes will mean that it leaves few cycles
    # for anything else
    if [ -n "$CTDB_SERVICE_NMB" ] ; then
	nice_service "$CTDB_SERVICE_NMB" start || die "Failed to start nmbd"
    fi

    nice_service "$CTDB_SERVICE_SMB" start || die "Failed to start samba"
}

service_stop ()
{
    service "$CTDB_SERVICE_SMB" stop
    program_stack_traces "smbd" 5
    if [ -n "$CTDB_SERVICE_NMB" ] ; then
	service "$CTDB_SERVICE_NMB" stop
    fi
}

######################################################################
# Show the testparm output using a cached smb.conf to avoid delays due
# to registry access.

smbconf_cache="$service_state_dir/smb.conf.cache"

testparm_foreground_update ()
{
    _timeout="$1"

    # No need to remove these temporary files, since there are only 2
    # of them.
    _out="${smbconf_cache}.out"
    _err="${smbconf_cache}.err"

    timeout "$_timeout" testparm -v -s >"$_out" 2>"$_err"
    case $? in
	0) : ;;
	124)
	    if [ -f "$smbconf_cache" ] ; then
		echo "WARNING: smb.conf cache update timed out - using old cache file"
		return 1
	    else
		echo "ERROR: smb.conf cache create failed - testparm command timed out"
		exit 1
	    fi
	    ;;
	*)
	    if [ -f "$smbconf_cache" ] ; then
		echo "WARNING: smb.conf cache update failed - using old cache file"
		cat "$_err"
		return 1
	    else
		echo "ERROR: smb.conf cache create failed - testparm failed with:"
		cat "$_err"
		exit 1
	    fi
    esac

    # Only using $$ here to avoid a collision.  This is written into
    # CTDB's own state directory so there is no real need for a secure
    # temporary file.
    _tmpfile="${smbconf_cache}.$$"
    # Patterns to exclude...
    _pat='^[[:space:]]+(registry[[:space:]]+shares|include|copy|winbind[[:space:]]+separator)[[:space:]]+='
    grep -Ev "$_pat" <"$_out" >"$_tmpfile"
    mv "$_tmpfile" "$smbconf_cache" # atomic

    return 0
}

testparm_background_update ()
{
    _timeout="$1"

    testparm_foreground_update "$_timeout" >/dev/null 2>&1 </dev/null &
}

testparm_cat ()
{
    testparm -s "$smbconf_cache" "$@" 2>/dev/null
}

list_samba_shares ()
{
    testparm_cat |
    sed -n -e 's@^[[:space:]]*path[[:space:]]*=[[:space:]]@@p' |
    sed -e 's/"//g'
}

list_samba_ports ()
{
    testparm_cat --parameter-name="smb ports" |
    sed -e 's@,@ @g'
}

###########################

is_ctdb_managed_service || exit 0

###########################

case "$1" in
startup)
	service_start
	;;

shutdown)
	service_stop
	;;

monitor)
	testparm_foreground_update 10
	ret=$?

	smb_ports="$CTDB_SAMBA_CHECK_PORTS"
	if [ -z "$smb_ports" ] ; then
	    smb_ports=$(list_samba_ports)
	    [ -n "$smb_ports" ] || die "Failed to set smb ports"
	fi
	# Intentionally unquoted multi-word value here
	# shellcheck disable=SC2086
	ctdb_check_tcp_ports $smb_ports || exit $?

	if [ "$CTDB_SAMBA_SKIP_SHARE_CHECK" != "yes" ] ; then
	    list_samba_shares | ctdb_check_directories || exit $?
	fi

	if [ $ret -ne 0 ] ; then
	    testparm_background_update 10
	fi
	;;
esac

exit 0