#! /bin/sh
# Copyright (c) 1995-2000 SuSE GmbH Nuernberg, Germany.
# Copyright (c)  2002 SuSE Linux AG
#
# Author: Klaas Freitag <freitag@suse.de>
#
# System startup script for setting SCSI scanner permissions
#
### BEGIN INIT INFO
# Provides: sane 
# Required-Start: $remote_fs $syslog
# Required-Stop:  $remote_fs $syslog
# Default-Start:  3 5
# Default-Stop:   0 1 2 6
# Description:    Adjusts permissions on a SCSI scanner device.
### END INIT INFO

# Shell functions sourced from /etc/rc.status:
#      rc_check         check and set local and overall rc status
#      rc_status        check and set local and overall rc status
#      rc_status -v     ditto but be verbose in local rc status
#      rc_status -v -r  ditto and clear the local rc status
#      rc_failed        set local and overall rc status to failed
#      rc_failed <num>  set local and overall rc status to <num><num>
#      rc_reset         clear local rc status (overall remains)
#      rc_exit          exit appropriate to overall rc status
. /etc/rc.status

# First reset status of this service
rc_reset

# Return values acc. to LSB for all commands but status:
# 0 - success
# 1 - generic or unspecified error
# 2 - invalid or excess argument(s)
# 3 - unimplemented feature (e.g. "reload")
# 4 - insufficient privilege
# 5 - program is not installed
# 6 - program is not configured
# 7 - program is not running
# 
# Note that starting an already running service, stopping
# or restarting a not-running service as well as the restart
# with force-reload (in case signalling is not supported) are
# considered a success.

store_dir=/var/lib/sane

if [ ${1:-"status"} != "status" ]; then
	if [ $UID != 0 ]; then
	    echo " only allowed for root"
	    rc_failed 4
	    rc_exit
	fi
fi

case "$1" in
    start)
	# Check if storage file exists.
	if [ ! -d $store_dir ]; then
	    mkdir $store_dir
	fi

	if [ -e $store_dir/devices ]; then
	    echo "Device list exists!"
	    mv $store_dir/devices $store_dir/devices.old
	fi

	echo "" > $store_dir/devices
	
	devices=`/usr/X11R6/bin/scanimage -f "%d"`

	# echo $devices
	ALT_IFS="$IFS"
	perms=666
	result=""
	prefix="Setting permission on"

	for devfile in ${devices}
	do
	# echo "Setting device $devfile"
	   if !(echo "$devfile" | grep "usb" -q); then 
	      IFS=":"
	       set $devfile
	       if [ $1 != "net" ]; then
		  echo -n $prefix $2
                  prefix=","
		  if [ -c $2 ]; then
		     # Is a block device
		     chmod $perms $2

		     # write to storage file
		     result="$2 $result"
		  else
		     echo -n "$2 is not a block device"
		  fi
	       fi
	   fi
	done
        echo $result > $store_dir/devices
	IFS="$ALT_IFS"

	## Start daemon with startproc(8). If this fails
	## the echo return value is set appropriate.

	# NOTE: startproc return 0, even if service is 
	# already running to match LSB spec.
	
	# Remember status and be verbose
	rc_status -v
	;;
    stop)
        if [ -e $store_dir/devices ]; then
	    result=""
	    for dev in `cat $store_dir/devices`; do 
		if [ -z "$dev" ]; then
		    echo -n "nothing to reset"
		else
		    if [ -c $dev ]; then
			chmod 640 $dev
			result="$result $dev"
		    fi
		fi
	    done
	    echo -n "Resetting permissions on scan device(s)$result"
	    rm -f $store_dir/devices
	else
	    rc_failed 2
	fi
	## Stop daemon with killproc(8) and if this fails
	## set echo the echo return value.

	# Remember status and be verbose
	rc_status -v
	;;
    try-restart)
	## Stop the service and if this succeeds (i.e. the 
	## service was running before), start it again.
	## Note: try-restart is not (yet) part of LSB (as of 0.7.5)
	$0 status >/dev/null &&  $0 restart

	# Remember status and be quiet
	rc_status
	;;
    restart)
	## Stop the service and regardless of whether it was
	## running or not, start it again.
	$0 stop
	$0 start

	# Remember status and be quiet
	rc_status
	;;
    force-reload)
	## Signal the daemon to reload its config. Most daemons
	## do this on signal 1 (SIGHUP).
	## If it does not support it, restart.
	rc_failed 3 
	rc_status -v
	;;
    reload)
	## Like force-reload, but if daemon does not support
	## signalling, do nothing (!)

	# If it supports signalling:
	rc_failed 3
	;;
    status)
	echo -n "Checking for SCSI scanner devices permissions: "
	## Check status with checkproc(8), if process is running
	## checkproc will return with exit status 0.

	# Status has a slightly different for the status command:
	# 0 - service running
	# 1 - service dead, but /var/run/  pid  file exists
	# 2 - service dead, but /var/lock/ lock file exists
	# 3 - service not running

	# NOTE: checkproc returns LSB compliant status values.
	if [ -e $store_dir/devices ]; then
            devices=`cat $store_dir/devices`
	    if [ -z $devices ]; then
		echo "no scan devices configured"
	    else
		echo ""
		for dev in $devices
		do
		    ls -al $dev
		done
	    fi
	fi
	rc_status -v
	;;
    *)
	echo "Usage: $0 {start|stop|status|try-restart|restart|force-reload|reload}"
	exit 1
	;;
esac
rc_exit
