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Do not assume an all-zeroes disk label will read back as a disk with
an 'a'  partition covering the whole disk, instead use the raw partition.
Also skip this test if the fss device is not available.
With lots of help from pgoyette.

# $NetBSD: t_fss.sh,v 1.3 2017/03/15 10:53:15 martin Exp $
#
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#
# Verify basic operation of fss(4) file system snapshot device
#

vnddev=vnd0
rawpart=$( sysctl -n kern.rawpartition | tr '01234' 'abcde' )
vnd=/dev/${vnddev}${rawpart}

orig_data="Original data"
repl_data="Replacement data"

atf_test_case basic cleanup
basic_body() {

# verify fss is available (or loadable as a module)

	fssconfig -l /dev/fss0 > /dev/null || atf_skip "FSS not available"

# create of mount-points for the file system and snapshot

	mkdir ./m1
	mkdir ./m2

# create a small 4MB file, treat it as a disk, init a file-system on it,
# and mount it

	dd if=/dev/zero of=./image bs=32k count=64
	vndconfig -c ${vnddev} ./image
	newfs -I ${vnd}
	mount ${vnd} ./m1

	echo "${orig_data}" > ./m1/text

# configure and mount a snapshot of the file system

	fssconfig -c fss0 ./m1 ./backup
	mount -o rdonly /dev/fss0 ./m2

# Modify the data on the underlying file system

	echo "${repl_data}" > ./m1/text || abort

# Verify that original data is still visible in the snapshot

	read test_data < ./m2/text
	atf_check_equal "${orig_data}" "${test_data}"
}

basic_cleanup() {
# Unmount our temporary stuff
	umount ${vnd}		|| true
	fssconfig -u fss0	|| true
	umount /dev/fss0	|| true
	vndconfig -u ${vnddev}	|| true
}

atf_init_test_cases()
{
        atf_add_test_case basic
}