#! /usr/local/bin/ksh93 -p
#
# CDDL HEADER START
#
# The contents of this file are subject to the terms of the
# Common Development and Distribution License (the "License").
# You may not use this file except in compliance with the License.
#
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# or http://www.opensolaris.org/os/licensing.
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# $FreeBSD: releng/12.3/tests/sys/cddl/zfs/tests/snapshot/snapshot_004_pos.ksh 329867 2018-02-23 16:31:00Z asomers $

#
# Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
# Use is subject to license terms.
#
# ident	"@(#)snapshot_004_pos.ksh	1.2	07/01/09 SMI"
#
. $STF_SUITE/include/libtest.kshlib

################################################################################
#
# __stc_assertion_start
#
# ID: snapshot_004_pos
#
# DESCRIPTION:
# Create a null snapshot i.e. a snapshot created before file system
# activity is empty.
#
# STRATEGY:
# 1. Empty a file system
# 2. Take a snapshot of the empty file system.
# 3. Populate the file system
# 4. Verify the snapshot is still empty
#
# TESTABILITY: explicit
#
# TEST_AUTOMATION_LEVEL: automated
#
# CODING_STATUS: COMPLETED (2005-07-04)
#
# __stc_assertion_end
#
################################################################################

verify_runnable "both"

function cleanup
{
	snapexists $SNAPFS
	[[ $? -eq 0 ]] && \
		log_must $ZFS destroy $SNAPFS

	[[ -e $TESTDIR ]] && \
		log_must $RM -rf $TESTDIR/* > /dev/null 2>&1
}

log_assert "Verify that a snapshot of an empty file system remains empty."

log_onexit cleanup

[[ -n $TESTDIR ]] && \
    log_must $RM -rf $TESTDIR/* > /dev/null 2>&1

log_must $ZFS snapshot $SNAPFS
FILE_COUNT=`$LS -Al $SNAPDIR | $GREP -v "total 0" | wc -l`
if [[ $FILE_COUNT -ne 0 ]]; then
	$LS $SNAPDIR
	log_fail "BEFORE: $SNAPDIR contains $FILE_COUNT files(s)."
fi

typeset -i COUNT=10

log_note "Populate the $TESTDIR directory"
populate_dir $TESTDIR/file $COUNT $NUM_WRITES $BLOCKSZ ITER

FILE_COUNT=`$LS -Al $SNAPDIR | $GREP -v "total 0" | wc -l`
if [[ $FILE_COUNT -ne 0 ]]; then
        $LS $SNAPDIR
        log_fail "AFTER: $SNAPDIR contains $FILE_COUNT files(s)."
fi

log_pass "The NULL snapshot remains empty."
