#!/bin/sh

# Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# This is used by the NFS init scripts to parse /etc/fstab, /etc/exports and
# work out which daemons we need to run. It makes more sense to have this
# common code in one place.

# Variables set up by this script, each set to 'yes' if needed
# NEED_IDMAPD
# NEED_GSSD
# NEED_STATD

# read in the options
DEFAULTFILE=/etc/conf.d/nfs
if [ -f "$DEFAULTFILE" ]; then
  . "$DEFAULTFILE"
fi

# Parse the fstab file, and determine whether we need idmapd and gssd.
# (The /etc/defaults settings, if any, will override our
# autodetection.)  This code is partially adapted from the mountnfs.sh
# script in the sysvinit package.
if [ -f /etc/fstab ]; then
  exec 9<&0 </etc/fstab

  while read DEV MTPT FSTYPE OPTS REST; do
    if [ "$FSTYPE" = "nfs4" ]; then
      NEED_IDMAPD=yes
    fi
    case "$OPTS" in
      sec=krb5|*,sec=krb5|sec=krb5,*|*,sec=krb5,*|sec=krb5i|*,sec=krb5i|sec=krb5i,*|*,sec=krb5i,*|sec=krb5p|*,sec=krb5p|sec=krb5p,*|*,sec=krb5p,*)
        NEED_GSSD=yes
          ;;
    esac
  done

  exec 0<&9 9<&-
fi

# We also need idmapd if we run an NFSv4 server. It's fairly difficult
# to autodetect whether there are NFSv4 exports or not, and idmapd is not a
# particularily heavy daemon, so we auto-enable it if we find an /etc/exports
# file. This does not mean that there are NFSv4 or other mounts active (or
# even that nfs-kernel-server is installed), but it matches what the "start"
# condition in nfs-kernel-server's init script does, which has a value in
# itself.
if [ -f /etc/exports ] && grep -q '^[[:space:]]*[^#]*/' /etc/exports; then
  NEED_IDMAPD=yes
fi

# See if there is an override in the config file
# For now, avoid =~ to be friendly to dash
echo "$NFS_NEEDED_SERVICES" | grep -qs "rpc.idmapd" && NEED_IDMAPD=yes
echo "$NFS_NEEDED_SERVICES" | grep -qs "rpc.gssd" && NEED_GSSD=yes
echo "$NFS_NEEDED_SERVICES" | grep -qs "rpc.statd" && NEED_STATD=yes