[LEDE-DEV] [PATCH 1/4] Add new script: scripts/its-maker.sh

John Crispin john at phrozen.org
Thu Sep 8 00:09:56 PDT 2016



On 08/09/2016 07:04, J Mo wrote:
> its-maker.sh creates an .its file, given a series of arguments, which is then used to create a FIT image.
> 
> Required to support the tew827dru, but intended to support the creation of any valid .its file.
> 
> Signed-off-by: jmomo <jmomo at jmomo.net>

this seems overly complicated. is there no existing tool to create its
images ?


> ---
>  scripts/its-maker.sh | 598 +++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 598 insertions(+)
>  create mode 100644 scripts/its-maker.sh
> 
> This is a new script to make ITS files, which are then used to produce a FIT image.
> 
> The existing mkits.sh script was device-specific and otherwise can not produce the FIT I need.
> 
> It does not support configurations, yet, but I'll add that if desired.
> 
> After I wrote my script, I became aware that Jason Wu was working on fixing up mkits.sh, but there hasn't been any progress and I'm not sure he's still interested in working on it. I will make him aware of my work: https://patchwork.ozlabs.org/patch/599455/
> 
> diff --git a/scripts/its-maker.sh b/scripts/its-maker.sh
> new file mode 100644
> index 0000000..7f4ba26
> --- /dev/null
> +++ b/scripts/its-maker.sh
> @@ -0,0 +1,598 @@
> +#!/bin/bash
> +#
> +# Create a u-boot FIT ITS (Image Tree Source) file given a convoluted series of arguments.
> +#
> +# Combination use of leading tabs and spaces is intentional for here-doc (<<-) and should be preserved.
> +#
> +# TODO:
> +#   Support for Configurations not done.
> +#   Clean up trap on interupt, etc.
> +#   Mandatory/optional fields could be better.
> +#   Consider harmonizing with mkimage arguments?
> +# 
> +# References:
> +#   https://casper.berkeley.edu/svn/trunk/roach/sw/uboot/doc/uImage.FIT/source_file_format.txt
> +#   https://lxr.missinglinkelectronics.com/uboot/doc/uImage.FIT/beaglebone_vboot.txt
> +#   http://lists.denx.de/pipermail/u-boot/2008-March/030898.html
> +#   https://wiki.linaro.org/WorkingGroups/Security/Verified-U-boot
> +
> +VERSION=1.0
> +MYNAME=$(basename $0)
> +declare -a ar_IMG_NAME
> +declare -a ar_IMG_DESCR
> +declare -a ar_IMG_FILE
> +declare -a ar_IMG_TYPE
> +declare -a ar_IMG_ARCH
> +declare -a ar_IMG_OS
> +declare -a ar_IMG_COMPRESSION
> +declare -a ar_IMG_LOAD_ADDR
> +declare -a ar_IMG_ENTRY_ADDR
> +declare -a ar_IMG_HASHES
> +declare -a ar_CFG_IDS
> +
> +# case +([0-9]) regex requires shopt -s extglob.
> +shopt -s extglob
> +
> +echoerr() {
> +	# Print errors to stderr.
> +	echo "$@" 1>&2;
> +	if [[ -n "$SEEN_ERROR" ]] ; then declare -r SEEN_ERROR=1 ; fi # If we saw any errors, set SEEN_ERROR=1, for later use.
> +}
> +
> +echodebug() {
> +	# Print debug messages to stderr if debugging enabled.
> +	if [[ "$SCRIPT_DEBUG" == 1 ]] ; then
> +		echo "DEBUG: $@" 1>&2;
> +	fi
> +}
> +
> +f_printusage() {
> +	# Print usage info.
> +	cat <<-EOF
> +		Usage:
> +
> +		  --out|-O                     Output file, otherwise output goes to stdout.
> +		  --device|-i                  Device for which we are building this ITS.
> +		  --fit-type|-T                The FIT format type. Defaults to "flat_dt".
> +		  --fit-description|-D         The FIT Description line.
> +
> +		  Image Commands: (all image commands must be followed by an integer ID.
> +
> +		    --img-name|-n              The name of the image.
> +		    --img-descr|-d             The description of the image.
> +		    --img-file|-f              The image data file.
> +		    --img-type|-t              The type/format of the image.
> +		    --img-arch|-a              The arch of the image.
> +		    --img-os|-o                The OS of the image.
> +		    --img-compression|-c       The compression of the image.
> +		    --img-load-addr|-l         The load address for the image.
> +		    --img-entry-addr|-e        The entry address for the image.
> +		    --img-hashes|-s            The image hash(es), comma-seperated.
> +
> +		  --debug                      Debug the $MYNAME script.
> +		  help|--help|-h|-H            Show help info.
> +
> +		Example:
> +
> +		  $MYNAME --device Widget5K --fit-type flat_dt --fit-description "Widget 5000 Extreme Edition Plus" --img-name 0 "upgrade-script" --img-descr 0 "Script to upgrade the firmware." --img-file 0 ~/tmp/myfile.scr --img-type 0 script --img-compression 0 none --img-name 1 "OS" --img-descr 1 "Widget 5000 Xe+ Operating System" --img-file 1 ~/tmp/myfile.bin --img-type 1 firmware --img-compression 1 none --img-arch 1 ARM --img-hashes 1 crc32,sha1
> +
> +	EOF
> +}
> +
> +f_help () {
> +	# Print some helpful information.
> +	cat <<- EOF
> +
> +		$MYNAME constructs a u-boot FIT DTS file for use with mkimage.
> +
> +		$MYNAME version: $VERSION
> +	EOF
> +	f_printusage
> +	return 0
> +}
> +
> +f_register_img_id () {
> +	# Register the IMG_ID in our ar_IMG_IDS array if needed.
> +	if ! [[ "${ar_IMG_IDS[$1]}" ]] ; then
> +		ar_IMG_IDS+=("$IMG_ID")
> +		echodebug "IMG_ID $IMG_ID added to ar_IMG_IDS"
> +	fi
> +}
> +
> +f_assemble_dts_header () {
> +	cat <<-EOF >> $DTS_BODY
> +	/dts-v1/;
> +	/ {
> +	  description = "${HEADER_DESCR}";
> +	  #address-cells = <1>;
> +	EOF
> +}
> +
> +f_assemble_img_header () {
> +	cat <<-EOF >> $DTS_BODY
> +	    images {
> +	EOF
> +}
> +
> +f_assemble_img_body_header () {
> +	cat <<-EOF >> $DTS_BODY
> +	      ${ar_IMG_NAME[$IMG_ID]}@${IMG_ID} {
> +	        data = /incbin/("${ar_IMG_FILE[$IMG_ID]}");
> +	        description = "${ar_IMG_DESCR[$IMG_ID]}";
> +	        type = "${ar_IMG_TYPE[$IMG_ID]}";
> +	        compression = "${ar_IMG_COMPRESSION[$IMG_ID]}";
> +	EOF
> +}
> +
> +f_assemble_img_body_arch () {
> +	cat <<-EOF >> $DTS_BODY
> +	        arch = "${ar_IMG_ARCH[$IMG_ID]}";
> +	EOF
> +}
> +
> +f_assemble_img_body_os () {
> +	cat <<-EOF >> $DTS_BODY
> +	        os = "${ar_IMG_OS[$IMG_ID]}";
> +	EOF
> +}
> +
> +f_assemble_img_body_load-entry () {
> +	cat <<-EOF >> $DTS_BODY
> +	        load = <${ar_IMG_LOAD_ADDR[$IMG_ID]}>;
> +	        entry = <${ar_IMG_ENTRY_ADDR[$IMG_ID]}>;
> +	EOF
> +}
> +
> +f_assemble_img_body_hash () {
> +	cat <<-EOF >> $DTS_BODY
> +	        hash@${HASH_NUM} {
> +	          algo = "${HASH_NAME}";
> +	        };
> +	EOF
> +}
> +
> +f_assemble_img_body_footer () {
> +	cat <<-EOF >> $DTS_BODY
> +	      };
> +	EOF
> +}
> +
> +f_assemble_img_footer () {
> +	cat <<-EOF >> $DTS_BODY
> +	    };
> +	EOF
> +}
> +
> +f_assemble_cfg_header () {
> +	cat <<-EOF >> $DTS_BODY
> +	    default = "config at 1";
> +	    configurations {
> +	EOF
> +}
> +
> +f_assemble_cfg_body () {
> +	# FIXME: Not done.
> +	cat <<-EOF >> $DTS_BODY
> +	        config at 1 {
> +	          description = "OpenWrt";
> +	          kernel = "kernel at 1";
> +	          fdt = "fdt at 1";
> +	        };
> +	EOF
> +}
> +
> +f_assemble_cfg_footer () {
> +	cat <<-EOF >> $DTS_BODY
> +	      };
> +	EOF
> +}
> +
> +f_assemble_dts_footer () {
> +	cat <<-EOF >> $DTS_BODY
> +	  };
> +	EOF
> +}
> +
> +f_validate_in_args3 () {
> +	# Validate $3 input argument.
> +	if [[ -z "$ARG3" ]] ; then
> +		echoerr -e "\nERROR: $ARG1 $IMG_ID argument missing.\n"
> +		exit 1
> +	fi
> +	if ( echo "$ARG3" | egrep "^--" &> /dev/null ) ; then
> +		# Look out for accidental missing values. However, this does incorrectly prohibit unusual valid data.
> +		echoerr -e "\nERROR: Suspected missing value for $ARG1 $IMG_ID.\n"
> +		exit 1
> +	fi
> +}
> +
> +# --
> +
> +# No input? Print usage and exit 1.
> +[[ "$#" -eq 0 ]] && { f_printusage ; exit 1 ; }
> +
> +while [[ "$#" -gt 0 ]] ; do case "$1" in
> +	--debug)
> +		SCRIPT_DEBUG=1
> +		# set -o functrace
> +		# set -x
> +		shift 1
> +	;;
> +	help|--help|-h|-H)
> +		f_help
> +		exit $?
> +	;;
> +	--out|-O)
> +		OUT_FILE=$2
> +		echodebug "Outfile set to $2"
> +		shift 2
> +	;;
> +	--device|-i)
> +		DEVICE=$2
> +		echodebug "Device set to $2"
> +		shift 2
> +	;;
> +	--fit-type|-T)
> +		if [[ -z "$FIT_TYPE" ]] ; then
> +			FIT_TYPE=$2
> +			echodebug "FIT type set to $2"
> +			shift 2
> +		else
> +			echoerr -e "\nERROR: --fit-fype was set more than once.\n"
> +			exit 1
> +		fi
> +	;;
> +	--fit-description|-D)
> +		if [[ -z "$HEADER_DESCR" ]] ; then
> +			HEADER_DESCR=$2
> +			echodebug "FIT description set to \"$2\""
> +			shift 2
> +		else
> +			echoerr -e "\nERROR: --fit-description was set more than once.\n"
> +			exit 1
> +		fi
> +	;;
> +	--img-name|-n)
> +		case "$2" in
> +			+([0-9]))
> +				IMG_ID=$2 ARG1=$1 ARG2=$2 ARG3=$3
> +				f_validate_in_args3
> +				if [[ -z "${ar_IMG_NAME[$IMG_ID]}" ]] ; then
> +					f_register_img_id $IMG_ID
> +					ar_IMG_NAME[$IMG_ID]=$3
> +					echodebug "$1 $IMG_ID set to \"$3\""
> +				else
> +					echoerr -e "\nERROR: --img-name $IMG_ID was set more than once.\n"
> +					exit 1
> +				fi
> +				shift 3 ; unset IMG_ID ARG1 ARG2 ARG3
> +			;;
> +			*)
> +				echoerr -e "\nERROR: Invalid --img-name ID. Must be an integer.\n"
> +				exit 1
> +			;;
> +		esac
> +	;;
> +	--img-descr|-d)
> +		case "$2" in
> +			+([0-9]))
> +				IMG_ID=$2 ARG1=$1 ARG2=$2 ARG3=$3
> +				f_validate_in_args3
> +				if [[ -z "${ar_IMG_DESCR[$IMG_ID]}" ]] ; then
> +					f_register_img_id $IMG_ID
> +					ar_IMG_DESCR[$IMG_ID]=$3
> +					echodebug "$1 $IMG_ID set to \"$3\""
> +				else
> +					echoerr -e "\nERROR: --img-descr $IMG_ID was set more than once.\n"
> +					exit 1
> +				fi
> +				shift 3 ; unset IMG_ID ARG1 ARG2 ARG3
> +			;;
> +			*)
> +				echoerr -e "\nERROR: Invalid --img-descr ID. Must be an integer.\n"
> +				exit 1
> +			;;
> +		esac
> +	;;
> +	--img-file|-f)
> +		case "$2" in
> +			+([0-9]))
> +				IMG_ID=$2 ARG1=$1 ARG2=$2 ARG3=$3
> +				f_validate_in_args3
> +				if [[ -z "${ar_IMG_FILE[$IMG_ID]}" ]] ; then
> +					f_register_img_id $IMG_ID
> +					ar_IMG_FILE[$IMG_ID]=$3
> +					echodebug "$1 $IMG_ID set to \"$3\""
> +				else
> +					echoerr -e "\nERROR: --img-file $IMG_ID was set more than once.\n"
> +					exit 1
> +				fi
> +				shift 3 ; unset IMG_ID ARG1 ARG2 ARG3
> +			;;
> +			*)
> +				echoerr -e "\nERROR: Invalid --img-file ID. Must be an integer.\n"
> +				exit 1
> +			;;
> +		esac
> +	;;
> +	--img-type|-t)
> +		case "$2" in
> +			+([0-9]))
> +				IMG_ID=$2 ARG1=$1 ARG2=$2 ARG3=$3
> +				f_validate_in_args3
> +				if [[ -z "${ar_IMG_TYPE[$IMG_ID]}" ]] ; then
> +					f_register_img_id $IMG_ID
> +					ar_IMG_TYPE[$IMG_ID]=$3
> +					echodebug "$1 $IMG_ID set to \"$3\""
> +				else
> +					echoerr -e "\nERROR: --img-type $IMG_ID was set more than once.\n"
> +					exit 1
> +				fi
> +				shift 3 ; unset IMG_ID ARG1 ARG2 ARG3
> +			;;
> +			*)
> +				echoerr -e "\nERROR: Invalid --img-type ID. Must be an integer.\n"
> +				exit 1
> +			;;
> +		esac
> +	;;
> +	--img-arch|-a)
> +		case "$2" in
> +			+([0-9]))
> +				IMG_ID=$2 ARG1=$1 ARG2=$2 ARG3=$3
> +				f_validate_in_args3
> +				if [[ -z "${ar_IMG_ARCH[$IMG_ID]}" ]] ; then
> +					f_register_img_id $IMG_ID
> +					ar_IMG_ARCH[$IMG_ID]=$3
> +					echodebug "$1 $IMG_ID set to \"$3\""
> +				else
> +					echoerr -e "\nERROR: --img-arch $IMG_ID was set more than once.\n"
> +					exit 1
> +				fi
> +				shift 3 ; unset IMG_ID ARG1 ARG2 ARG3
> +			;;
> +			*)
> +				echoerr -e "\nERROR: Invalid --img-arch ID. Must be an integer.\n"
> +				exit 1
> +			;;
> +		esac
> +	;;
> +	--img-os|-o)
> +		case "$2" in
> +			+([0-9]))
> +				IMG_ID=$2 ARG1=$1 ARG2=$2 ARG3=$3
> +				f_validate_in_args3
> +				if [[ -z "${ar_IMG_OS[$IMG_ID]}" ]] ; then
> +					f_register_img_id $IMG_ID
> +					ar_IMG_OS[$IMG_ID]=$3
> +					echodebug "$1 $IMG_ID set to \"$3\""
> +				else
> +					echoerr -e "\nERROR: --img-os $IMG_ID was set more than once.\n"
> +					exit 1
> +				fi
> +				shift 3 ; unset IMG_ID ARG1 ARG2 ARG3
> +			;;
> +			*)
> +				echoerr -e "\nERROR: Invalid --img-os ID. Must be an integer.\n"
> +				exit 1
> +			;;
> +		esac
> +	;;
> +	--img-compression|-c)
> +		case "$2" in
> +			+([0-9]))
> +				IMG_ID=$2 ARG1=$1 ARG2=$2 ARG3=$3
> +				f_validate_in_args3
> +				if [[ -z "${ar_IMG_COMPRESSION[$IMG_ID]}" ]] ; then
> +					f_register_img_id $IMG_ID
> +					ar_IMG_COMPRESSION[$IMG_ID]=$3
> +					echodebug "$1 $IMG_ID set to \"$3\""
> +				else
> +					echoerr -e "\nERROR: --img-compression $IMG_ID was set more than once.\n"
> +					exit 1
> +				fi
> +				shift 3 ; unset IMG_ID ARG1 ARG2 ARG3
> +			;;
> +			*)
> +				echoerr -e "\nERROR: Invalid --img-compression ID. Must be an integer.\n"
> +				exit 1
> +			;;
> +		esac
> +	;;
> +	--img-load-addr|-l)
> +		case "$2" in
> +			+([0-9]))
> +				IMG_ID=$2 ARG1=$1 ARG2=$2 ARG3=$3
> +				f_validate_in_args3
> +				if [[ -z "${ar_IMG_LOAD_ADDR[$IMG_ID]}" ]] ; then
> +					f_register_img_id $IMG_ID
> +					ar_IMG_LOAD_ADDR[$IMG_ID]=$3
> +					echodebug "$1 $IMG_ID set to \"$3\""
> +				else
> +					echoerr -e "\nERROR: --img-load-addr $IMG_ID was set more than once.\n"
> +					exit 1
> +				fi
> +				shift 3 ; unset IMG_ID ARG1 ARG2 ARG3
> +			;;
> +			*)
> +				echoerr -e "\nERROR: Invalid --img-load-addr ID. Must be an integer.\n"
> +				exit 1
> +			;;
> +		esac
> +	;;
> +	--img-entry-addr|-e)
> +		case "$2" in
> +			+([0-9]))
> +				IMG_ID=$2 ARG1=$1 ARG2=$2 ARG3=$3
> +				f_validate_in_args3
> +				if [[ -z "${ar_IMG_ENTRY_ADDR[$IMG_ID]}" ]] ; then
> +					f_register_img_id $IMG_ID
> +					ar_IMG_ENTRY_ADDR[$IMG_ID]=$3
> +					echodebug "$1 $IMG_ID set to \"$3\""
> +				else
> +					echoerr -e "\nERROR: --img-entry-addr $IMG_ID was set more than once.\n"
> +					exit 1
> +				fi
> +				shift 3 ; unset IMG_ID ARG1 ARG2 ARG3
> +			;;
> +			*)
> +				echoerr -e "\nERROR: Invalid --img-entry-addr ID. Must be an integer.\n"
> +				exit 1
> +			;;
> +		esac
> +	;;
> +	--img-hashes|-s)
> +		case "$2" in
> +			+([0-9]))
> +				IMG_ID=$2 ARG1=$1 ARG2=$2 ARG3=$3
> +				f_validate_in_args3
> +				if [[ -z "${ar_IMG_HASHES[$IMG_ID]}" ]] ; then
> +					f_register_img_id $IMG_ID
> +					ar_IMG_HASHES[$IMG_ID]=$3
> +					echodebug "$1 ${IMG_ID} set to \"$3\""
> +				else
> +					echoerr -e "\nERROR: --img-hashes $IMG_ID was set more than once.\n"
> +					exit 1
> +				fi
> +				shift 3 ; unset IMG_ID ARG1 ARG2 ARG3
> +			;;
> +			*)
> +				echoerr -e "\nERROR: Invalid --img-hashes ID. Must be an integer.\n"
> +				exit 1
> +			;;
> +		esac
> +	;;
> +	*)
> +		echoerr -e "\nERROR: Invalid argument \"$1\".\n"
> +		f_printusage
> +		exit 1
> +	;;
> +esac ; done
> +
> +# Build the ITS.
> +# NOTE: The ITS format is complicated. It's our job to build the ITS. It's mkimage's job to determine if the content is valid.
> +#  We do some basic validity checking, but producing an invalid ITS is a valid scenerio.
> +
> +DTS_BODY=$(mktemp)
> +
> +# Assemble the header.
> +#
> +
> +# If we didn't get a FIT/header description, make one up by default.
> +if [[ -z "$HEADER_DESCR" ]] ; then
> +	if [[ -z "$DEVICE" ]] ; then
> +		HEADER_DESCR="LEDE FIT image"
> +	else # use $DEVICE if we have it.
> +		HEADER_DESCR="LEDE FIT image for ${DEVICE}"
> +	fi
> +fi
> +
> +f_assemble_dts_header
> +
> +# At least one image entry is required by the ITS format.
> +if [[ -z "${ar_IMG_IDS[@]}" ]] ; then
> +	echoerr -e "\nERROR: At least one valid image is required.\n"
> +	exit 1
> +fi
> +
> +f_assemble_img_header
> +
> +# Assemble an Image block for each.
> +for IMGBLOCK in ${ar_IMG_IDS[@]} ; do 
> +	IMG_ID=$IMGBLOCK
> +	echodebug "Processing IMG_ID $IMG_ID"
> +	# The following fields are required for all images: description, type, data, compression.
> +	for EACH in "${ar_IMG_DESCR[$IMG_ID]}" "${ar_IMG_TYPE[$IMG_ID]}" "${ar_IMG_FILE[$IMG_ID]}" "${ar_IMG_COMPRESSION[$IMG_ID]}" ; do
> +		if [[ -z "$EACH" ]] ; then
> +			MISSING_IMG_REQUIRED=1
> +		fi
> +	done ; unset EACH
> +	[[ "$MISSING_IMG_REQUIRED" == 1 ]] && { 
> +		echoerr -e "\nERROR: Missing one or more required attributes for IMG_ID $IMG_ID.\n"
> +		exit 1 ; }
> +	f_assemble_img_body_header
> +	case "${ar_IMG_TYPE[$IMG_ID]}" in # ARCH is conditionally mandatory for certain image types.
> +		standalone|kernel|firmware|ramdisk|fdt)
> +			if [[ -z "${ar_IMG_ARCH[$IMG_ID]}" ]] ; then
> +				echoerr -e "\nERROR: --img-arch required for this image type.\n"
> +				exit 1
> +			fi
> +		;;
> +	esac
> +	if [[ -n "${ar_IMG_ARCH[$IMG_ID]}" ]] ; then # Add architecture.
> +		f_assemble_img_body_arch
> +	fi
> +	case "${ar_IMG_TYPE[$IMG_ID]}" in # OS is conditionally mandatory for kernels.
> +		kernel)
> +			if [[ -z "${ar_IMG_OS[$IMG_ID]}" ]] ; then
> +				echoerr -e "\nERROR: --img-os required for this image type.\n"
> +				exit 1
> +			fi
> +		;;
> +	esac
> +	if [[ -n "${ar_IMG_OS[$IMG_ID]}" ]] ; then # Add OS.
> +		f_assemble_img_body_os
> +	fi
> +	case "${ar_IMG_TYPE[$IMG_ID]}" in # LOAD/ENTRY is conditionally mandatory for standalone kernels.
> +		standalone|kernel)
> +			if [[ -z "${ar_IMG_LOAD_ADDR[$IMG_ID]}" ]] || [[ -z "${ar_IMG_ENTRY_ADDR[$IMG_ID]}" ]]; then
> +				echoerr -e "\nERROR: --img-load-addr and --img-entry-addr are required for this image type.\n"
> +				exit 1
> +			fi
> +		;;
> +	esac
> +	if [[ -n "${ar_IMG_LOAD_ADDR[$IMG_ID]}" ]] && [[ -n "${ar_IMG_ENTRY_ADDR[$IMG_ID]}" ]]; then # Load and entry required together.
> +		f_assemble_img_body_load-entry
> +		# FIXME: Error on one but not the other.
> +	fi
> +	if [[ -n "${ar_IMG_HASHES[$IMG_ID]}" ]] ; then # Hashes are optional.
> +		echodebug "IMG_ID $IMG_ID has hashes"
> +		HASH_NUM=0
> +		while IFS=',' ; do
> +			for EACH in ${ar_IMG_HASHES[$IMG_ID]} ; do
> +				echodebug "Processing IMG_ID $IMG_ID HASH_ID $EACH"
> +				HASH_NAME=$EACH
> +				f_assemble_img_body_hash
> +				HASH_NUM=$(( HASH_NUM + 1 ))
> +			done ; unset EACH
> +			break
> +		done ; unset HASH_NUM HASH_NAME
> +	fi
> +	f_assemble_img_body_footer
> +done ; unset IMGBLOCK IMG_ID
> +
> +f_assemble_img_footer
> +
> +# Assemble a Configuration block for each.
> +# FIXME: not done.
> +for EACH in ${ar_CFG_IDS[@]} ; do
> +	CFG_ID=$EACH
> +	f_assemble_cfg_header
> +	f_assemble_cfg_body
> +	f_assemble_cfg_footer
> +done ; unset EACH CFG_ID
> +
> +# Assemble the footer.
> +f_assemble_dts_footer
> +
> +# If we don't have an output file, print to stdout.
> +if [[ -z "$OUT_FILE" ]] ; then
> +	echodebug "Printing DTS to stdout"
> +	cat "$DTS_BODY" && rm -f "$DTS_BODY"
> +else
> +	# Make sure we are not going to clobber a file.
> +	if [[ -f "$OUT_FILE" ]] ; then
> +		echoerr -e "\nERROR: Output file \"OUT_FILE\" already exists!.\n"
> +		exit 1
> +	fi
> +	echodebug "Writing output file."
> +	cat "$DTS_BODY" > $OUT_FILE ; X_WRITE_OUT=$?
> +	if [[ "$X_WRITE_OUT" == 0 ]] ; then
> +		echo -e "\nDTS file written to: $OUT_FILE\n"
> +		rm -f "$DTS_BODY"
> +	else
> +		echoerr -e "\nERROR: Writing output file failed.\n"
> +		exit 1
> +	fi
> +fi
> +
> 



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