#! /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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# $FreeBSD: releng/12.3/tests/sys/cddl/zfs/tests/snapshot/snapshot_001_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_001_pos.ksh	1.2	07/01/09 SMI"
#
. $STF_SUITE/include/libtest.kshlib

################################################################################
#
# __stc_assertion_start
#
# ID: snapshot_001_pos
#
# DESCRIPTION:
# A zfs file system snapshot is identical to
# the originally snapshot'd file system, after the file
# system has been changed. Uses 'sum -r'.
#
# STRATEGY:
# 1. Create a file in the zfs file system
# 2. Checksum the file for later comparison
# 3. Create a snapshot of the dataset
# 4. Append to the original file
# 5. Verify the snapshot and file agree
#
# TESTABILITY: explicit
#
# TEST_AUTOMATION_LEVEL: automated
#
# CODING_STATUS: COMPLETED (2005-07-04)
#
# __stc_assertion_end
#
###############################################################################

verify_runnable "both"

function cleanup
{
	snapexists $SNAPFS
	if [[ $? -eq 0 ]]; then
		log_must $ZFS destroy $SNAPFS
	fi

	if [[ -e $SNAPDIR ]]; then
		log_must $RM -rf $SNAPDIR > /dev/null 2>&1
	fi

	if [[ -e $TESTDIR ]]; then
		log_must $RM -rf $TESTDIR/* > /dev/null 2>&1
	fi
}

log_assert "Verify a file system snapshot is identical to original."

log_onexit cleanup

log_note "Create a file in the zfs filesystem..."
log_must $FILE_WRITE -o create -f $TESTDIR/$TESTFILE -b $BLOCKSZ \
    -c $NUM_WRITES -d $DATA

log_note "Sum the file, save for later comparison..."
FILE_SUM=`$SUM -r $TESTDIR/$TESTFILE | $AWK  '{ print $1 }'`
log_note "FILE_SUM = $FILE_SUM"

log_note "Create a snapshot and mount it..."
log_must $ZFS snapshot $SNAPFS

log_note "Append to the original file..."
log_must $FILE_WRITE -o append -f $TESTDIR/$TESTFILE -b $BLOCKSZ \
    -c $NUM_WRITES -d $DATA

SNAP_FILE_SUM=`$SUM -r $SNAPDIR/$TESTFILE | $AWK '{ print $1 }'`
if [[ $SNAP_FILE_SUM -ne $FILE_SUM ]]; then
	log_fail "Sums do not match, aborting!! ($SNAP_FILE_SUM != $FILE_SUM)"
fi

log_pass "Both Sums match. ($SNAP_FILE_SUM == $FILE_SUM)"
