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#!/bin/sh -e
# print "1" if device $1 is either removable or attached to a bus listed
# in $2 (e.g. 'ieee1394 usb') and "0" otherwise.
# check if the device $1 is on the bus $2
# this is done by checking if any of the devices on the bus is a prefix
# of the device
on_bus() {
local BUSDEVP="/sys/bus/$2/devices"
for link in $BUSDEVP/*; do
[ -L "$link" ] || continue
if echo "$1" | grep -q "^$(readlink -f $link)/"; then
return 0
fi
done
return 1
}
# read the first line of the file $1
read_value() {
local value
read -r value < $1 || true
echo $value
}
# strip the partition number, if present
DEV="${1%%[0-9]*}"
SCAN_BUS="$2"
BLOCKPATH="/sys/block/$DEV"
[ -d $BLOCKPATH ] || exit 1
IS_REMOVABLE=$(read_value $BLOCKPATH/removable)
if [ "$IS_REMOVABLE" != 1 -a "$SCAN_BUS" ]; then
DEVICE="$(readlink -f "${BLOCKPATH}/device")"
for bus in "$SCAN_BUS"; do
if on_bus $DEVICE $bus; then
IS_REMOVABLE=1
break
fi
done
fi
if [ "$IS_REMOVABLE" = "1" ]; then
echo 1
else
echo 0
fi
exit 0
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