+ return $_mounted
+}
+
+check_block_devices()
+{
+ _mounted=0
+ # so that * expands to empty string if there are no block devices
+ shopt -s nullglob
+
+ for device in /sys/block/*; do
+ device=$(/bin/basename $device)
+
+ # skipping any devices that start with md or ra (ram) or lo
+ # (loop) or fd (floppy)
+
+ start_device=${device:0:2}
+ if [ "$start_device" == "ra" ] || [ "$start_device" == "md" ] ||
+ [ "$start_device" == "lo" ] || [ "$start_device" == "fd" ]; then
+ continue
+ fi
+
+ # If this is a removable (e.g., USB flash) device, then try to
+ # look for an ISO image on each of its partitions.
+ if [ "$(cat /sys/block/$device/removable)" = "1" ] ; then
+ partitions=$(/bin/awk "\$4 ~ /${device}[0-9]*/ { print \$4 }" /proc/partitions)
+ for partition in $partitions ; do
+ echo "pl_sysinit: checking $partition for iso image"
+ mkdir -p /tmp/$partition
+ if /bin/mount -o ro -t msdos,ext2 /dev/$partition /tmp/$partition 2>&1 > /dev/null ; then
+ # Look for the first ISO image
+ for iso in /tmp/$partition/*.iso ; do
+ if /sbin/losetup /dev/loop0 $iso ; then
+ echo "pl_sysinit: using $(basename $iso) on $partition"
+ device="loop0"
+ break
+ fi
+ done
+ if [ "$device" != "loop0" ] ; then
+ /bin/umount /tmp/$partition 2>&1 > /dev/null
+ fi
+ fi
+ done
+ fi
+
+ echo "pl_sysinit: checking $device for /usr contents"
+ /bin/mount -o ro -t iso9660 /dev/$device /usr 2>&1 > /dev/null
+ if [ $? -eq 0 ]; then