#!/bin/bash

# vars
EXPORTS_FILE="/etc/exports"
BEGIN_LLIUREX="### BEGIN LLIUREX EXPORTED FILESYSTEMS"
END_LLIUREX="### END LLIUREX EXPORTED FILESYSTEMS"
#ocfs2 vars
VAR_LIST="OCFS2_NET_EXPORT_DIRS LLIUREX_PXE_FLAVOURS"
LLX_GETVAR="/usr/sbin/llxcfg-showvars"
eval `${LLX_GETVAR} ${VAR_LIST}`

# funcs
normalize_dir(){
   echo "$1" |sed -e "s%^%/%;s%/\{2,\}%/%g;s%/$%%"
}

mount_test(){
   if ! mount |grep -q "^${1}[[:blank:]]\+on[[:blank:]]\+${2}\b" ; then
      mount --bind "$1" "$2" &> /dev/null || return 1
   fi
   return 0
}

mount_check_umount(){
   if mount |grep -q "^${1}[[:blank:]]\+on[[:blank:]]\+${2}\b" ; then
      umount -l "$2" &> /dev/null || true
   fi
}

system_keytab(){
   echo "nfs/server.${SRV_DOMAIN}"
   return 0
}

client_keytab(){
   system_keytab
   case $NFS_POLICY in
      strict)
        get_dhcp_host_list |sed -ne "/\(^[^,]\+,\)\{3\}/{s%^%nfs/%;s%,.*$%%;s%$%.${SRV_DOMAIN}%p}"
         ;;
      medium)
         get_dhcp_host_list |sed -e "s%^%nfs/%;s%,.*$%%;s%$%.${SRV_DOMAIN}%"
         ;;
      loose)
         get_dhcp_host_list |sed -e "s%^%nfs/%;s%,.*$%%;s%$%.${SRV_DOMAIN}%"
         get_noreg_host_list |sed -e "s%^%nfs/%;s%,.*$%%;s%$%.${SRV_DOMAIN}%"
         ;;
   esac
}

gen_exports(){
   # get current exports or original one:
   if [ -r "$EXPORTS_FILE" ] ; then
      sed -e "/^${BEGIN_LLIUREX}$/,/^${END_LLIUREX}$/d" "$EXPORTS_FILE"
   else
      llxcfg-cpkg plainview "$EXPORTS_FILE" || true
   fi
   # add begin mark
   echo "$BEGIN_LLIUREX"
   llxcfg-config dump nfs-server/exports-raw

   # read exports conffiles
   llxcfg-config dump nfs-server/exports-live |sed -ne "/${VALIDATE_REGEXP}/p" |while read nfs nmnt nrw nopts ; do
      # normalize data
      nfs="$(normalize_dir "$nfs")"
      nmnt="$(normalize_dir "$nmnt")"
      # test fs
      if [ -d "$nfs" ] && [ -d "$nmnt" ]; then
         # test / mount fs
         if mount_test "${nfs}" "${nmnt}" ; then
            NOPTS="_@_NFS_EXPORT_OPTIONS_@_"
            [ -z "$nopts" ] || NOPTS="$nopts" 	
	    echo "${nmnt} *(${nrw},${NOPTS})"
         fi
      elif [ ! -d "$nfs" ]; then
           mount_check_umount "${nfs}" "${nmnt}"
     fi
   done

   # add a line for "root" export directory
   [ -d "$NFS_EXPORT_DIR" ] || mkdir -p "$NFS_EXPORT_DIR"
   echo "_@_NFS_EXPORT_DIR_@_	gss/krb5(ro,fsid=0,_@_NFS_EXPORT_OPTIONS_@_)"

   llxcfg-config dump nfs-server/exports |sed -ne "/${VALIDATE_REGEXP}/p" |while read nfs nmnt nrw nopts ; do
      # normalize data
      nfs="$(normalize_dir "$nfs")"
      nmnt="$(normalize_dir "$nmnt")"
      # test fs
      if [ -d "$nfs" ] ; then
         # test mount point under /export
         [ -d "${NFS_EXPORT_DIR}${nmnt}" ] || mkdir -p "${NFS_EXPORT_DIR}${nmnt}"
         # test / mount fs
         if mount_test "${nfs}" "${NFS_EXPORT_DIR}${nmnt}" ; then
            NOPTS="_@_NFS_EXPORT_OPTIONS_@_"
            [ -z "$nopts" ] || NOPTS="$nopts"
	##Check if OCFS2 is defined
	   if [ "$OCFS2_NET_EXPORT_DIRS" ] ; then
	   	for ocfs_dir in $OCFS2_NET_EXPORT_DIRS; do
	   		echo "${NFS_EXPORT_DIR}/net/${ocfs_dir} gss/krb5(${nrw},${NOPTS})"
	   	done
	   fi
	##End OCFS2   	
	echo "${NFS_EXPORT_DIR}${nmnt} gss/krb5(${nrw},${NOPTS})"
	

            # generate netmount file
#            echo "server:/	${nmnt}	nfs4	sec=krb5,proto=tcp,port=2049" >> "${NETMOUNT_FILE}"
            echo "server:${nmnt}	${nmnt}	nfs4	sec=krb5,proto=tcp,port=2049,noatime,nodiratime" >> "${NETMOUNT_FILE}"
         fi
      fi
   done
   echo "$END_LLIUREX"
}

# main
VALIDATE_REGEXP="^\([^[:blank:]#]\+[[:blank:]]\+\)\{2\}\(ro\|rw\)\([[:blank:]]\+[^[:blank:]]\+\)*"
VAR_LIST="NFS_EXPORT_DIR NFS_POLICY SRV_DOMAIN"
eval "$(llxcfg-showvars $VAR_LIST)"

# libreria
LIB_FILE="/usr/share/lliurex/lliurex-srv-common/lliurex-netfuncs.sh"
[ -e "$LIB_FILE" ] || exit 1
. $LIB_FILE


[ "$NFS_EXPORT_DIR" ] || exit 1
NFS_EXPORT_DIR="$(normalize_dir "$NFS_EXPORT_DIR")"

# install templates
llxcfg-config list nfs-server/templates |while  read rname ; do
   llxcfg-config read "nfs-server/templates/$rname" |skel-install -t "/etc/$rname"
done

# generate exports
NETMOUNT_FILE="./netmount"
:> "$NETMOUNT_FILE"
gen_exports |skel-install -t "$EXPORTS_FILE"

# export mounts to netmount client via netconfig
cat "$NETMOUNT_FILE" |llxcfg-config write "netconfig/conffiles/netmount/nfs-server"

# generate krb5 server conffile to generate keytabs for clients (via system keytab)
# TODO: separate clients keytab

# system_keytab |llxcfg-config write krb5-server/system-keytab/nfs-server
# client_keytab |llxcfg-config write krb5-server/client-keytab/nfs-server

# TOD export system keytab

exit 0