#!/bin/sh
#
# =head1 NAME
#
# mkiso - construct an ISO9660 CD image for burning a data CD
#
# =head1 SYNOPSIS
#
# mkiso [-l label] [-o image.iso] directory
#
# =head1 DESCRIPTION
#
# I<mkiso> embodies my usual incantation
# for constructing an ISO9660 image for a CDROM.
# It is partner to mkcd(1cs), a program to burn data CDs.
# I<mkiso> makes plain vanilla data CDs, not bootable or audio CDs.
#
# =head1 OPTIONS
#
# =over 4
#
# =item B<-l> I<label>
#
# The default Volume identifier for the image
# is normally taken from the file B<LABEL> in the top of the I<directory>.
# (This is because I like my data sets self describing,
# an having such a file is the simplest method not needing any metadata).
# Alternatively you may supply the Volume Identifier
# on the command line with this option.
#
# =item B<-o> B<I<image>.iso>
#
# Specify the location of the resulting ISO9660 image.
# By default this is a file in the current directory
# called B<I<basename>.iso>, where I<basename> is the basename
# of the I<directory> named on the command line.
#
# =back
#
# =head1 FILES
#
# The B<PUBL> (publisher) and B<PREP> (preparer) values
# come from the B<$HOME/.mkisofsrc> file.
# See mkisofs(1) for more information.
#
# =head1 SEE ALSO
#
# mkcd(1cs), mkisofs(1), cdrecord(1)
#
# =head1 CREDITS
#
# I<mkiso> is really just a wrapper for the mkisofs(1) command
# by Joerg Schilling.
#
# =head1 AUTHOR
#
# Cameron Simpson <cs@zip.com.au> 12jul2000
#

cmd=`basename "$0"`
usage="Usage: $cmd [-l label] [-o image.iso] directory
	-l label	Label string (VOLI field, up to 32 bytes).
			Default: the contents of the top level
				 LABEL file, or the directory
				 basename plus ISO date.
	-o image.iso	Specify output file.
			Default: directory.iso"

out=
volid=
label=
iso=
badopts=
while :
do  case $1 in
      -l)	label=$2; shift ;;
      -o)	out=$2; shift ;;
      --)	shift; break ;;
      -?*)	echo "$cmd: unrecognised option: $1" >&2
		badopts=1
		;;
      *)	break ;;
    esac
    shift
done

if [ $# = 0 ]
then
    echo "$cmd: missing directory" >&2
    badopts=1
else
    dir=$1; shift
    [ $# = 0 ] || { echo "$cmd: extra arguments: $*" >&2
		    badopts=1
		  }
fi

[ $badopts ] && { echo "$usage" >&2; exit 2; }

ok=1

if [ ! -d "$dir/." ]
then
    echo "$cmd: not a directory: $dir" >&2
    ok=
fi

if [ -z "$out" ]
then
    out=`basename "$dir"`.iso
    echo "iso=$out"
fi

if [ -z "$label" ]
then
    lfile=$dir/LABEL
    if [ ! -s "$lfile" ]
    then
	label=`basename "$dir"`" - "`date '+%Y-%m-%d'`
	echo "$cmd: no label file: $lfile" >&2
	echo "	using \"$label\""
    else
	label=`cat <"$lfile"`
	if [ $? != 0 ]
	then
	    echo "$cmd: problems reading label file $lfile" >&2
	    ok=
	else
	    if [ -z "$label" ]
	    then
		echo "$cmd: empty label from $lfile" >&2
		ok=
	    else
		echo "VOLI=$label"
	    fi
	fi
    fi
fi

if [ -s "$iso" ]
then
    echo "$cmd: existing file: $iso" >&2
    ok=
fi

[ $ok ] || exit 1

set -x
exec mkisofs -D -J -allow-leading-dots -N -r -T -v -V "$label" -o "$out" "$dir"
## old mkisofs ## exec mkisofs -D -J -L -N -r -T -v -V "$label" -o "$out" "$dir"