#!/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/cli_root/zfs_snapshot/zfs_snapshot_004_neg.ksh 329867 2018-02-23 16:31:00Z asomers $

#
# Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
# Use is subject to license terms.
#
# ident	"@(#)zfs_snapshot_004_neg.ksh	1.2	08/05/14 SMI"
#

. $STF_SUITE/include/libtest.kshlib

#################################################################################
#
# __stc_assertion_start
#
# ID: zfs_snapshot_004_neg
#
# DESCRIPTION:
#	Verify recursive snapshotting could not break ZFS. 
#
# STRATEGY:
#	1. Create deeply-nested filesystems until it is too long to create snap
#	2. Verify zfs snapshot -r pool@snap will not break ZFS
#
# TESTABILITY: explicit
#
# TEST_AUTOMATION_LEVEL: automated
#
# CODING_STATUS: COMPLETED (2007-08-08)
#
# __stc_assertion_end
#
################################################################################

verify_runnable "both"

function cleanup
{
	if datasetexists $initfs ; then
		log_must $ZFS destroy -rf $initfs
	fi
}

log_assert "Verify recursive snapshotting could not break ZFS."
log_onexit cleanup

initfs=$TESTPOOL/$TESTFS/$TESTFS
basefs=$initfs
typeset -i ret=0 len snaplen
while ((ret == 0)); do
	$ZFS create $basefs
	$ZFS snapshot $basefs@snap1
	ret=$?
	
	len=$($ECHO $basefs| $WC -c)
	if ((ret != 0)); then
		log_note "The deeply-nested filesystem len: $len"
		#
		# Make sure there are at lease 2 characters left 
		# for snapshot name space, otherwise snapshot name
		# is incorrect
		#
		if ((len >= 255)); then
			if datasetexists $basefs; then
				log_must $ZFS destroy -r $basefs
			fi
			basefs=${basefs%/*}
			len=$($ECHO $basefs| $WC -c)
		fi
		break
	else
		log_note "ZFS snapshot suceeded.  len: $len"
	fi

	basefs=$basefs/$TESTFS
done

# Make snapshot name is longer than the max length
((snaplen = 256 - len + 10))
snap=$(gen_dataset_name $snaplen "s")
log_mustnot $ZFS snapshot -r $TESTPOOL@$snap

log_must datasetnonexists $TESTPOOL@$snap
while [[ $basefs != $TESTPOOL ]]; do
	log_must datasetnonexists $basefs@$snap
	basefs=${basefs%/*}
done

log_pass "Verify recursive snapshotting could not break ZFS."
