if [ ! "$_MEDIA_NFS_SUBR" ]; then _MEDIA_NFS_SUBR=1
#
# Copyright (c) 2012-2013 Devin Teske
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
#
############################################################ INCLUDES

BSDCFG_SHARE="/usr/share/bsdconfig"
. $BSDCFG_SHARE/common.subr || exit 1
f_dprintf "%s: loading includes..." media/nfs.subr
f_include $BSDCFG_SHARE/device.subr
f_include $BSDCFG_SHARE/dialog.subr
f_include $BSDCFG_SHARE/media/common.subr
f_include $BSDCFG_SHARE/media/network.subr
f_include $BSDCFG_SHARE/media/tcpip.subr
f_include $BSDCFG_SHARE/struct.subr
f_include $BSDCFG_SHARE/variable.subr

BSDCFG_LIBE="/usr/libexec/bsdconfig"
f_include_lang $BSDCFG_LIBE/include/messages.subr

############################################################ GLOBALS

NFS_MOUNTED=

############################################################ FUNCTIONS

# f_media_set_nfs
#
# Return success if we both found and set the media type to be an NFS server.
# Variables from variable.subr that can be used to script user input:
#
# 	VAR_NFS_PATH
# 		The NFS path specification (host:path) to use when mounting the
# 		remote repository.
# 	VAR_NAMESERVER [Optional]
# 		Automatically populated from resolv.conf(5) but can be
# 		overridden. If set, the host portion of VAR_NFS_PATH is
# 		looked up using f_host_lookup() from `tcpip.subr'.
#
# Meanwhile, the following variables from variable.subr are set after
# successful execution:
#
# 	VAR_NFS_HOST
# 		The host portion of the NFS path specification, parsed from
# 		VAR_NFS_PATH.
#
f_media_set_nfs()
{
	local nfs

	f_media_close

	f_variable_get_value $VAR_NFS_PATH \
		"$msg_please_enter_the_full_nfs_file_specification"
	f_getvar $VAR_NFS_PATH nfs
	[ "$nfs" ] || return $FAILURE

	case "$nfs" in
	*:*) : valid NFS path ;;
	*)
		f_show_msg "$msg_invalid_nfs_path_specification"
		return $FAILURE
	esac

	f_struct_new DEVICE device_nfs
	device_nfs set name "$nfs"

	if ! f_struct device_network ||
	   ! f_dialog_yesno "$msg_youve_already_done_the_network_configuration"
	then
		f_struct device_network &&
			f_device_shutdown device_network
		f_device_select_tcp || return $FAILURE
		local dev if
		f_getvar $VAR_NETWORK_DEVICE if
		f_device_find -1 "$if" $DEVICE_TYPE_NETWORK dev
		f_struct_copy "$dev" device_network
	fi
	f_device_init device_network ||
		f_dprintf "%s: $msg_net_device_init_failed\n" f_media_set_nfs

	local hostname="${nfs%%:*}"
	if f_isset $VAR_NAMESERVER && ! {
		f_validate_ipaddr "$hostname" || f_validate_ipaddr6 "$hostname"
	}; then
		f_show_info "$msg_looking_up_host" "$hostname"
		f_dprintf "%s Looking up hostname, %s, using host(1)" \
		          "f_media_set_nfs" "$hostname"
		if ! f_quietly f_host_lookup "$hostname"; then
			f_show_msg "$msg_cannot_resolve_hostname" "$hostname"
			f_struct device_network &&
				f_device_shutdown device_network
			f_struct_free device_network
			unset $VAR_NFS_PATH
			return $FAILURE
		fi
		f_dprintf "Found DNS entry for %s successfully." "$hostname"
	fi

	setvar $VAR_NFS_HOST "$hostname"

	device_nfs set type     $DEVICE_TYPE_NFS
	device_nfs set init     f_media_init_nfs
	device_nfs set get      f_media_get_nfs
	device_nfs set shutdown f_media_shutdown_nfs
	device_nfs set private  device_network # in name only (deref'd later)

	f_struct_copy device_nfs device_media
	f_struct_free device_nfs

	return $SUCCESS
}

# f_media_init_nfs $device
#
# Initializes the NFS media device. Returns success if able to mount the NFS
# device using mount_nfs(1).
#
# The variables (from variable.subr) used to initialize the NFS mount are as
# follows (all of which are configured manually/optionally from the options
# menu):
#
# 	VAR_NFS_TCP [Optional]
# 		If non-NULL, adds the "tcp" option via `-o' to mount_nfs(8).
# 	VAR_NFS_V3 [Optional]
# 		If non-NULL, adds the "nfsv3" option via `-o' to mount_nfs(8).
# 	VAR_NFS_SECURE [Optional]
# 		If non-NULL, adds the "-P" flag to mount_nfs(8).
# 	VAR_SLOW_ETHER [Optional]
# 		If non-NULL, adjusts the read/write size to avoid timeouts.
#
f_media_init_nfs()
{
	local funcname=f_media_init_nfs
	local dev="$1" name err

	$dev get name name || return $FAILURE
	f_dprintf "Init routine called for NFS device. name=[%s]" \
	          "$name"

	if [ "$NFS_MOUNTED" ]; then
		f_dprintf "NFS device already mounted."
		return $SUCCESS
	fi

	if ! f_device_init device_network; then
		f_dprintf "f_media_init_nfs: %s" "$msg_net_device_init_failed"
		return $FAILURE
	fi

	if [ ! -e "$MOUNTPOINT" ]; then
		f_eval_catch $funcname mkdir 'mkdir -p "%s"' "$MOUNTPOINT" ||
			return $FAILURE
	fi

	local cp tcp="" use3="" secure="" readsize=4096 writesize=4096
	f_getvar $VAR_NFS_TCP cp
	[ "$cp" = "YES" ] && tcp=1
	f_getvar $VAR_NFS_V3 cp
	[ "$cp" = "YES" ] && use3=1
	f_getvar $VAR_NFS_SECURE cp
	[ "$cp" = "YES" ] && secure=1
	f_getvar $VAR_SLOW_ETHER cp
	[ "$cp" = "YES" ] && readsize=1024 writesize=1024

	local options="rsize=$readsize,wsize=$writesize"
	[ "$use3" ] && options="$options,nfsv3"
	[ "$tcp" ] && options="$options,tcp"

	if ! f_eval_catch -dk err $funcname mount_nfs \
		'mount_nfs %s -o "%s" "%s" "%s"' \
		"${secure:+-P}" "$options" "$name" "$MOUNTPOINT"
	then
		err="${err#mount_nfs: }"
		f_show_msg "$msg_error_mounting_device" \
		           "$name" "$MOUNTPOINT" "$err"
		f_struct device_network &&
			f_device_shutdown device_network
		return $FAILURE
	fi
	NFS_MOUNTED=1

	f_dprintf "Mounted NFS device %s onto %s" "$name" "$MOUNTPOINT"

	return $SUCCESS
}

# f_media_get_nfs $device $file [$probe_type]
#
# Returns data from $file on a mounted NFS device. Similar to cat(1). If
# $probe_type is present and non-NULL, returns success if $file exists. If
# $probe_type is equal to $PROBE_SIZE, prints the size of $file in bytes to
# standard-out.
#
f_media_get_nfs()
{
	local dev="$1" file="$2" probe_type="$3"
	local name

	$dev get name name
	f_dprintf "f_media_get_nfs: dev=[%s] file=[%s] probe_type=%s" \
	          "$name" "$file" "$probe_type"

	f_media_generic_get "$MOUNTPOINT" "$file" "$probe_type"
}

# f_media_shutdown_nfs $device
#
# Shuts down the NFS device using umount(8). Return status should be ignored.
#
f_media_shutdown_nfs()
{
	local funcname=f_media_shutdown_nfs
	local dev="$1" err

	[ "$NFS_MOUNTED" ] || return $FAILURE

	f_dprintf "Unmounting NFS partition on %s" "$MOUNTPOINT"
	if ! f_eval_catch -dk err $funcname umount \
		'umount -f "%s"' "$MOUNTPOINT"
	then
		err="${err#umount: }"; err="${err#*: }"
		f_show_msg "$msg_could_not_unmount_the_nfs_partition" \
		           "$MOUNTPOINT" "$err"
	else
		NFS_MOUNTED=
	fi
}

############################################################ MAIN

f_dprintf "%s: Successfully loaded." media/nfs.subr

fi # ! $_MEDIA_NFS_SUBR