invsync

<B>Digital的Unix操作系统VAX 4.2源码</B>

#!/bin/sh5
#
#	invsync.sh5 -
#		inventory synchronization program
#
#
#			Copyright (c) 1990 by
#		Digital Equipment Corporation, Maynard, MA
#			All rights reserved.
#
#	This software is furnished under a license and may be used and
#	copied  only  in accordance with the terms of such license and
#	with the  inclusion  of  the  above  copyright  notice.   This
#	software  or  any  other copies thereof may not be provided or
#	otherwise made available to any other person.  No title to and
#	ownership of the software is hereby transferred.		
#
#	The information in this software is subject to change  without
#	notice  and should not be construed as a commitment by Digital
#	Equipment Corporation.					
#
#	Digital assumes no responsibility for the use  or  reliability
#	of its software on equipment which is not supplied by Digital.
#
#	SCCSID = "@(#)invsync	4.2 (ULTRIX)	10/16/90";
#
#	000	16-oct-1990	ccb
#		bugfixes. integrate udetect call
#

CDPATH= ;export CDPATH		# assure no surprises.
PATH=/install.tmp:/etc/stl:/etc:/bin:/usr/bin:/usr/adm/bin:/usr/ucb

:	-Main
#		main routine
#

Main()
{
	cd  /usr/etc/subsets

	# Establish a list of subsets which must be syncronized,
	#  taken in install-order.

	SYNCLIST=`ls -rt *.inv | sed 's/\.inv//g'`
	# determine which of these are installed
	INSTALLED=
	for S in $SYNCLIST
	{
		[ -f $S.lk ] &&
			INSTALLED="$INSTALLED $S"
	}

	set -- $INSTALLED


	# sort the initial inventory ascending by pathname
	Y=$1
	echo "Initial Subset: $Y"
	sort -o $Y.#syn +9 -10 $Y.inv

	# Iteratively synchronize inventories 2 at a time.
	#  the oldest two are synchronized into one which
	#  is in turn used as the oldest in the next iteration
	#

	while [ $# -gt 1 ]
	do
		# pop the first two from the list.
		X=$1 Y=$2
		shift

		mv $X.#syn $X.syn 2> /dev/null

		# get original copies the inventories
		#  if we haven't already and sort them
		[ -f $X.syn ] ||
		{
			sort -o $X.syn +9 -10 $X.inv &
			SORTPID=$!
		}

		[ -f $Y.syn ] ||
			sort -o $Y.syn +9 -10 $Y.inv

		(Wait SORTPID)

		# synchronize the inventory pair
		echo "Synchronize $Y...\c"
		usync $X.syn $Y.syn > $Y.#syn
		echo "done."

		rm -f $X.syn
	done

	mv $Y.#syn MSI
	(cd /;/etc/stl/udetect) < MSI > CFI
}



:	-Wait
#		intelligent wait routine
#
#	given:	$1 - the name of the variable contianing the pid of the
#			process to wait for (yes, this uses call-by-reference)
#		[$2 - $n] - optional string to eval if wait fails
#	does:	wait on the specified PID if contents of $1 is not null
#		if wait returns !0 status, eval remainder of command line
#		clear contents of variable specified in $1
#	return:	exit status of the wait

Wait()
{
	VAR=$1
	shift

	# was there a first arg?
	[ ! "$VAR" ] && return 0

	eval VAL=\$$VAR

	# was the value of the named variable set?
	[ ! "$VAL" ] && return 0

	# clear the value from the named variable
	eval $VAR=

	wait $VAL ||
	{
		STAT=$?
		eval $*
		return $STAT
	}
}

ARGS=$*

[ "$INVSYNC_DEBUG" ] || Main $ARGS
echo OK