#!/bin/sh
#
# dpio - use cpio to archive the specified directories to tape
#        or read a cpio archive
# 
# Written 22 Dec 93 by Ronald Joe Record (rr@sco.com) after having
# executed "man cpio" hundreds of times over the last decade.
#
# Modified 05-Aug-97 by rr@sco.com incorporating compression option
# based on extension written by Sean M. McKee (mckee@misslink.net)
#
# Normal use of this script would be to read or write a cpio archive
# from/to a 150 Mb cartridge tape. The usual invocation would be
# "dpio -i" to read and "dpio dir1 dir2 dir3" or "dpio ." to write.
#

usage() {
	echo "Usage: dpio [-ictvu] [-K Volume-size] [-f file] [dir list ...]"
	exit 1
}

DIRS=
VOLSIZ=150000
DEVICE=/dev/rct0
V=
T=
COMP=
UNCOMP=
READ=

while getopts citvuK:f: c
do
	case $c in
		K)  VOLSIZ=$OPTARG
			;;
		f)  DEVICE=$OPTARG
			;;
		c)  COMP="| gzip -9"
		    UNCOMP="| gzcat"
			;;
		i)  READ=1
			;;
		t)  T=t
			;;
		u)  usage
			;;
		v)  V=v
			;;
		?)  usage
			;;
	esac
done
shift `expr $OPTIND - 1`

DIRS=$*

[ "$DIRS" = "" ] && [ "$READ" = "" ] && usage

if [ "$READ" ]
then
    if [ "$UNCOMP" ]
    then
	dd if=$DEVICE | gzcat | cpio -icd${T}${V}B
    else
	cpio -icd${T}${V}B -I$DEVICE
    fi
else
    if [ "$COMP" ]
    then
     find $DIRS -depth -print | cpio -oc${T}${V}BK $VOLSIZ | gzip -9 | dd of=$DEVICE
    else
     find $DIRS -depth -print | cpio -oc${T}${V}BK $VOLSIZ -O$DEVICE
    fi

fi