#!/bin/bash
#
# lshmc - Print files from a HMC drive DVD
#
# Copyright IBM Corp. 2015, 2017
#
# s390-tools is free software; you can redistribute it and/or modify
# it under the terms of the MIT license. See LICENSE for details.
#

TOOL=$(basename $0)
FTPDEV="/dev/hmcdrv"
FTPCMD="dir"

#------------------------------------------------------------------------------
# Print usage
#------------------------------------------------------------------------------
function PrintUsage() {
	cat <<-EOD
		Usage: $(basename $0) [OPTIONS] [FILE]

		List information about the FILE(s) residing on a HMC drive DVD.
		Use OPTIONS described below or present simple wildcards on
		behalf of FILE.

		-h, --help	Print this help, then exit.
		-v, --version	Print version information, then exit.
		-s, --short	Print only files, in a short listing format.
	EOD
}

#------------------------------------------------------------------------------
# Print version
#------------------------------------------------------------------------------
function PrintVersion()
{
	cat <<-EOD
	$TOOL: version %S390_TOOLS_VERSION%
	Copyright IBM Corp. 2015, 2017
	EOD
}


FILES=""

while [ $# -gt 0 ]; do
	case $1 in
	--help|-h)
		PrintUsage
		exit 0
		;;
	--version|-v)
		PrintVersion
		exit 0
		;;
	--short|-s)
		FTPCMD="nls"
		;;
	-*)
		echo "$TOOL: Invalid option $1"
		echo "Try '$TOOL --help' for more information."
		exit 1
		;;
	*)
		FILES="$FILES $1"
		;;
	esac

	shift
done


if [ ! -c "$FTPDEV" ]; then
	echo "$TOOL: Device \"$FTPDEV\" does not exist (modprobe hmcdrv ?)"
	exit 1
fi

if [ ${#FILES} -eq 0 ]; then
	FILES="/"
fi

# open device $FTPDEV and assign the file descriptor to variable fd
exec {fd}<>${FTPDEV}
# echo the FTP command into device file
echo "$FTPCMD $FILES" >&${fd}
# and output the response
cat <&${fd}
STATUS="$?"
# close file descriptor $fd
exec {fd}>&-
exit $STATUS