#
# CDDL HEADER START
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# The contents of this file are subject to the terms of the
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# If applicable, add the following below this CDDL HEADER, with the
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#
# Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
# Use is subject to license terms.
#

#
# Copyright (c) 2012 by Delphix. All rights reserved.
#

. $STF_SUITE/include/libtest.shlib
. $STF_SUITE/tests/functional/cli_root/zpool_upgrade/zpool_upgrade.cfg

# This part of the test suite relies on variables being setup in the
# zpool_upgrade.cfg script. Those variables give us details about which
# files make up the pool, and what the pool name is.


# A function to import a pool from files we have stored in the test suite
# We import the pool, and create some random data in the pool.
# $1 a version number we can use to get information about the pool
function create_old_pool
{
	VERSION=$1
	POOL_FILES=$(eval $ECHO \$ZPOOL_VERSION_${VERSION}_FILES)
	POOL_NAME=$(eval $ECHO \$ZPOOL_VERSION_${VERSION}_NAME)

	log_note "Creating $POOL_NAME from $POOL_FILES"
	for pool_file in $POOL_FILES; do
		log_must $BZCAT \
		    $STF_SUITE/tests/functional/cli_root/zpool_upgrade/blockfiles/$pool_file.bz2 \
		    >/$TESTPOOL/$pool_file
	done
	log_must $ZPOOL import -d /$TESTPOOL $POOL_NAME

	# Now put some random contents into the pool.
	COUNT=0
	while [ $COUNT -lt 1024 ]; do
		$DD if=/dev/urandom of=/$POOL_NAME/random.$COUNT \
		count=1 bs=1024 > /dev/null 2>&1
		COUNT=$(( $COUNT + 1 ))
	done
}


# A function to check the contents of a pool, upgrade it to the current version
# and then verify that the data is consistent after upgrading. Note that we're
# not using "zpool status -x" to see if the pool is healthy, as it's possible
# to also upgrade faulted, or degraded pools.
# $1 a version number we can use to get information about the pool
function check_upgrade {
	VERSION=$1
	POOL_FILES=$(eval $ECHO \$ZPOOL_VERSION_${VERSION}_FILES)
	POOL_NAME=$(eval $ECHO \$ZPOOL_VERSION_${VERSION}_NAME)

	log_note "Checking if we can upgrade from ZFS version ${VERSION}."
	PRE_UPGRADE_CHECKSUM=$(check_pool $POOL_NAME pre )
	log_must $ZPOOL upgrade $POOL_NAME > /dev/null
	POST_UPGRADE_CHECKSUM=$(check_pool $POOL_NAME post )

	log_note "Checking that there are no differences between checksum output"
	log_must $DIFF $PRE_UPGRADE_CHECKSUM $POST_UPGRADE_CHECKSUM
	$RM $PRE_UPGRADE_CHECKSUM $POST_UPGRADE_CHECKSUM
}

# A function to destroy an upgraded pool, plus the files it was based on.
# $1 a version number we can use to get information about the pool
function destroy_upgraded_pool {
	VERSION=$1
	POOL_FILES=$(eval $ECHO \$ZPOOL_VERSION_${VERSION}_FILES)
	POOL_NAME=$(eval $ECHO \$ZPOOL_VERSION_${VERSION}_NAME)

	if poolexists $POOL_NAME; then
		log_must $ZPOOL destroy $POOL_NAME
	fi
	for file in $POOL_FILES; do
		if [ -e /$TESTPOOL/$file ]; then
			$RM /$TESTPOOL/$file
		fi
	done
}

# This function does a basic sanity check on the pool by computing the
# checksums of all files in the pool, echoing the name of the file containing
# the checksum results.
# $1 the name of the pool
# $2 a flag we can use to determine when this check is being performed
#    (ie. pre or post pool-upgrade)
function check_pool { # pool state
	POOL=$1
	STATE=$2
	$FIND /$POOL -type f -exec $CKSUM {} + > \
		/$TESTPOOL/pool-checksums.$POOL.$STATE
	echo /$TESTPOOL/pool-checksums.$POOL.$STATE
}

# This function simply checks that a pool has a particular version number
# as reported by zdb and zpool upgrade -v
# $1 the name of the pool
# $2 the version of the pool we expect to see
function check_poolversion { # pool version

	POOL=$1
	VERSION=$2

	# check version using zdb
	ACTUAL=$($ZDB -C $POOL | $SED -n 's/version: \(.*\)$/\1/p')

	if [ $ACTUAL != $VERSION ]
	then
		log_fail "$POOL not upgraded, ver. $ACTUAL, expected $VERSION"
	fi

	# check version using zpool upgrade
	ACTUAL=$($ZPOOL upgrade | $GREP $POOL$ | \
	 $AWK '{print $1}' | $SED -e 's/ //g')
	if [ $ACTUAL != $VERSION ]
	then
		log_fail "$POOL reported version $ACTUAL, expected $VERSION"
	fi
}

# A simple function to get a random number between two bounds
# probably not the most efficient for large ranges, but it's okay.
# Note since we're using $RANDOM, 32767 is the largest number we
# can accept as the upper bound.
# $1 lower bound
# $2 upper bound
function random { # min max

	typeset MIN=$1
	typeset MAX=$2
	typeset RAND=0

	while [ $RAND -lt $MIN ]
	do
		RAND=$(( $RANDOM % $MAX + 1))
	done

	echo $RAND
}