#!/bin/bash
#
# Verify that an assortment of known good reference pools can be imported
# using different versions of the ZoL code.
#
# By default references pools for the major ZFS implementation will be
# checked against the most recent ZoL tags and the master development branch.
# Alternate tags or branches may be verified with the '-s <src-tag> option.
# Passing the keyword "installed" will instruct the script to test whatever
# version is installed.
#
# Preferentially a reference pool is used for all tests.  However, if one
# does not exist and the pool-tag matches one of the src-tags then a new
# reference pool will be created using binaries from that source build.
# This is particularly useful when you need to test your changes before
# opening a pull request.  The keyword 'all' can be used as short hand
# refer to all available reference pools.
#
# New reference pools may be added by placing a bzip2 compressed tarball
# of the pool in the scripts/zfs-images directory and then passing
# the -p <pool-tag> option.  To increase the test coverage reference pools
# should be collected for all the major ZFS implementations.  Having these
# pools easily available is also helpful to the developers.
#
# Care should be taken to run these tests with a kernel supported by all
# the listed tags.  Otherwise build failure will cause false positives.
#
#
# EXAMPLES:
#
# The following example will verify the zfs-0.6.2 tag, the master branch,
# and the installed zfs version can correctly import the listed pools.
# Note there is no reference pool available for master and installed but
# because binaries are available one is automatically constructed.  The
# working directory is also preserved between runs (-k) preventing the
# need to rebuild from source for multiple runs.
#
#  zimport.sh -k -f /var/tmp/zimport \
#      -s "zfs-0.6.2 master installed" \
#      -p "zevo-1.1.1 zol-0.6.2 zol-0.6.2-173 master installed"
#
# --------------------- ZFS on Linux Source Versions --------------
#                 zfs-0.6.2       master          0.6.2-175_g36eb554
# -----------------------------------------------------------------
# Clone ZFS       Local		Local		Skip
# Build ZFS       Pass		Pass		Skip
# -----------------------------------------------------------------
# zevo-1.1.1      Pass		Pass		Pass
# zol-0.6.2       Pass		Pass		Pass
# zol-0.6.2-173   Fail		Pass		Pass
# master          Pass		Pass		Pass
# installed       Pass		Pass		Pass
#

BASE_DIR=$(dirname "$0")
SCRIPT_COMMON=common.sh
if [ -f "${BASE_DIR}/${SCRIPT_COMMON}" ]; then
	. "${BASE_DIR}/${SCRIPT_COMMON}"
else
	echo "Missing helper script ${SCRIPT_COMMON}" && exit 1
fi

PROG=zimport.sh
SRC_TAGS="zfs-0.6.5.11 master"
POOL_TAGS="all master"
POOL_CREATE_OPTIONS=
TEST_DIR=$(mktemp -u -d -p /var/tmp zimport.XXXXXXXX)
KEEP="no"
VERBOSE="no"
COLOR="yes"
REPO="https://github.com/zfsonlinux"
IMAGES_DIR="$SCRIPTDIR/zfs-images/"
IMAGES_TAR="https://github.com/zfsonlinux/zfs-images/tarball/master"
ERROR=0

CONFIG_LOG="configure.log"
CONFIG_OPTIONS=${CONFIG_OPTIONS:-""}
MAKE_LOG="make.log"
MAKE_OPTIONS=${MAKE_OPTIONS:-"-s -j$(nproc)"}

COLOR_GREEN="\033[0;32m"
COLOR_RED="\033[0;31m"
COLOR_BROWN="\033[0;33m"
COLOR_RESET="\033[0m"

usage() {
cat << EOF
USAGE:
zimport.sh [hvl] [-r repo] [-s src-tag] [-i pool-dir] [-p pool-tag]
    [-f path] [-o options]

DESCRIPTION:
	ZPOOL import verification tests

OPTIONS:
	-h                Show this message
	-v                Verbose
	-c                No color
	-k                Keep temporary directory
	-r <repo>         Source repository ($REPO)
	-s <src-tag>...   Verify ZoL versions with the listed tags
	-i <pool-dir>     Pool image directory
	-p <pool-tag>...  Verify pools created with the listed tags
	-f <path>         Temporary directory to use
	-o <options>      Additional options to pass to 'zpool create'

EOF
}

while getopts 'hvckr:s:i:p:f:o:?' OPTION; do
	case $OPTION in
	h)
		usage
		exit 1
		;;
	v)
		VERBOSE="yes"
		;;
	c)
		COLOR="no"
		;;
	k)
		KEEP="yes"
		;;
	r)
		REPO="$OPTARG"
		;;
	s)
		SRC_TAGS="$OPTARG"
		;;
	i)
		IMAGES_DIR="$OPTARG"
		;;
	p)
		POOL_TAGS="$OPTARG"
		;;
	f)
		TEST_DIR="$OPTARG"
		;;
	o)
		POOL_CREATE_OPTIONS="$OPTARG"
		;;
	?)
		usage
		exit 1
		;;
	esac
done

#
# Verify the module start is not loaded
#
if lsmod | grep zfs >/dev/null; then
	echo "ZFS modules must be unloaded"
	exit 1
fi

#
# Create a random directory tree of files and sub-directories to
# to act as a copy source for the various regression tests.
#
populate() {
	local ROOT=$1
	local MAX_DIR_SIZE=$2
	local MAX_FILE_SIZE=$3

	# shellcheck disable=SC2086
	mkdir -p $ROOT/{a,b,c,d,e,f,g}/{h,i}
	DIRS=$(find "$ROOT")

	for DIR in $DIRS; do
		COUNT=$((RANDOM % MAX_DIR_SIZE))

		# shellcheck disable=SC2034
		for i in $(seq $COUNT); do
			FILE=$(mktemp -p "$DIR")
			SIZE=$((RANDOM % MAX_FILE_SIZE))
			dd if=/dev/urandom of="$FILE" bs=1k \
			    count="$SIZE" &>/dev/null
		done
	done

	return 0
}

SRC_DIR=$(mktemp -d -p /var/tmp/ zfs.src.XXXXXXXX)
trap 'rm -Rf "$SRC_DIR"' INT TERM EXIT
populate "$SRC_DIR" 10 100

SRC_DIR="$TEST_DIR/src"
SRC_DIR_ZFS="$SRC_DIR/zfs"

if [ "$COLOR" = "no" ]; then
	COLOR_GREEN=""
	COLOR_BROWN=""
	COLOR_RED=""
	COLOR_RESET=""
fi

pass_nonewline() {
	echo -n -e "${COLOR_GREEN}Pass${COLOR_RESET}\t\t"
}

skip_nonewline() {
	echo -n -e "${COLOR_BROWN}Skip${COLOR_RESET}\t\t"
}

fail_nonewline() {
	echo -n -e "${COLOR_RED}Fail${COLOR_RESET}\t\t"
}

#
# Log a failure message, cleanup, and return an error.
#
fail() {
	echo -e "$PROG: $1" >&2
	$ZFS_SH -u >/dev/null 2>&1
	exit 1
}

#
# Set several helper variables which are derived from a source tag.
#
# ZFS_TAG - The passed zfs-x.y.z tag
# ZFS_DIR - The zfs directory name
# ZFS_URL - The zfs github URL to fetch the tarball
#
src_set_vars() {
	local TAG=$1

	ZFS_TAG="$TAG"
	ZFS_DIR="$SRC_DIR_ZFS/$ZFS_TAG"
	ZFS_URL="$REPO/zfs/tarball/$ZFS_TAG"

	if [ "$TAG" = "installed" ]; then
		ZPOOL_CMD=$(command -v zpool)
		ZFS_CMD=$(command -v zfs)
		ZFS_SH="/usr/share/zfs/zfs.sh"
	else
		ZPOOL_CMD="./cmd/zpool/zpool"
		ZFS_CMD="./cmd/zfs/zfs"
		ZFS_SH="./scripts/zfs.sh"
	fi
}

#
# Set several helper variables which are derived from a pool name such
# as zol-0.6.x, zevo-1.1.1, etc.  These refer to example pools from various
# ZFS implementations which are used to verify compatibility.
#
# POOL_TAG          - The example pools name in scripts/zfs-images/.
# POOL_BZIP         - The full path to the example bzip2 compressed pool.
# POOL_DIR          - The top level test path for this pool.
# POOL_DIR_PRISTINE - The directory containing a pristine version of the pool.
# POOL_DIR_COPY     - The directory containing a working copy of the pool.
# POOL_DIR_SRC      - Location of a source build if it exists for this pool.
#
pool_set_vars() {
	local TAG=$1

	POOL_TAG=$TAG
	POOL_BZIP=$IMAGES_DIR/$POOL_TAG.tar.bz2
	POOL_DIR=$TEST_DIR/pools/$POOL_TAG
	POOL_DIR_PRISTINE=$POOL_DIR/pristine
	POOL_DIR_COPY=$POOL_DIR/copy
	POOL_DIR_SRC="$SRC_DIR_ZFS/${POOL_TAG//zol/zfs}"
}

#
# Construct a non-trivial pool given a specific version of the source.  More
# interesting pools provide better test coverage so this function should
# extended as needed to create more realistic pools.
#
pool_create() {
	pool_set_vars "$1"
	src_set_vars "$1"

	if [ "$POOL_TAG" != "installed" ]; then
		cd "$POOL_DIR_SRC" || fail "Failed 'cd $POOL_DIR_SRC'"
	fi

	$ZFS_SH zfs="spa_config_path=$POOL_DIR_PRISTINE" || \
	    fail "Failed to load kmods"

	# Create a file vdev RAIDZ pool.
	truncate -s 1G \
	    "$POOL_DIR_PRISTINE/vdev1" "$POOL_DIR_PRISTINE/vdev2" \
	    "$POOL_DIR_PRISTINE/vdev3" "$POOL_DIR_PRISTINE/vdev4" || \
	    fail "Failed 'truncate -s 1G ...'"
	# shellcheck disable=SC2086
	$ZPOOL_CMD create $POOL_CREATE_OPTIONS "$POOL_TAG" raidz \
	    "$POOL_DIR_PRISTINE/vdev1" "$POOL_DIR_PRISTINE/vdev2" \
	    "$POOL_DIR_PRISTINE/vdev3" "$POOL_DIR_PRISTINE/vdev4" || \
	    fail "Failed '$ZPOOL_CMD create $POOL_CREATE_OPTIONS $POOL_TAG ...'"

	# Create a pool/fs filesystem with some random contents.
	$ZFS_CMD create "$POOL_TAG/fs" || \
	    fail "Failed '$ZFS_CMD create $POOL_TAG/fs'"
	populate "/$POOL_TAG/fs/" 10 100

	# Snapshot that filesystem, clone it, remove the files/dirs,
	# replace them with new files/dirs.
	$ZFS_CMD snap "$POOL_TAG/fs@snap" || \
	    fail "Failed '$ZFS_CMD snap $POOL_TAG/fs@snap'"
	$ZFS_CMD clone "$POOL_TAG/fs@snap" "$POOL_TAG/clone" || \
	    fail "Failed '$ZFS_CMD clone $POOL_TAG/fs@snap $POOL_TAG/clone'"
	# shellcheck disable=SC2086
	rm -Rf /$POOL_TAG/clone/*
	populate "/$POOL_TAG/clone/" 10 100

	# Scrub the pool, delay slightly, then export it.  It is now
	# somewhat interesting for testing purposes.
	$ZPOOL_CMD scrub "$POOL_TAG" || \
	    fail "Failed '$ZPOOL_CMD scrub $POOL_TAG'"
	sleep 10
	$ZPOOL_CMD export "$POOL_TAG" || \
	    fail "Failed '$ZPOOL_CMD export $POOL_TAG'"

	$ZFS_SH -u || fail "Failed to unload kmods"
}

# If the zfs-images directory doesn't exist fetch a copy from Github then
# cache it in the $TEST_DIR and update $IMAGES_DIR.
if [ ! -d "$IMAGES_DIR" ]; then
	IMAGES_DIR="$TEST_DIR/zfs-images"
	mkdir -p "$IMAGES_DIR"
	curl -sL "$IMAGES_TAR" | \
	    tar -xz -C "$IMAGES_DIR" --strip-components=1 || \
	    fail "Failed to download pool images"
fi

# Given the available images in the zfs-images directory substitute the
# list of available images for the reserved keyword 'all'.
for TAG in $POOL_TAGS; do

	if  [ "$TAG" = "all" ]; then
		# shellcheck disable=SC2010
		ALL_TAGS=$(ls "$IMAGES_DIR" | grep "tar.bz2" | \
		    sed 's/.tar.bz2//' | tr '\n' ' ')
		NEW_TAGS="$NEW_TAGS $ALL_TAGS"
	else
		NEW_TAGS="$NEW_TAGS $TAG"
	fi
done
POOL_TAGS="$NEW_TAGS"

if [ "$VERBOSE" = "yes" ]; then
	echo "---------------------------- Options ----------------------------"
	echo "VERBOSE=$VERBOSE"
	echo "KEEP=$KEEP"
	echo "REPO=$REPO"
	echo "SRC_TAGS=$SRC_TAGS"
	echo "POOL_TAGS=$POOL_TAGS"
	echo "PATH=$TEST_DIR"
	echo "POOL_CREATE_OPTIONS=$POOL_CREATE_OPTIONS"
	echo
fi

if [ ! -d "$TEST_DIR" ]; then
	mkdir -p "$TEST_DIR"
fi

if [ ! -d "$SRC_DIR" ]; then
	mkdir -p "$SRC_DIR"
fi

# Print a header for all tags which are being tested.
echo "--------------------- ZFS on Linux Source Versions --------------"
printf "%-16s" " "
for TAG in $SRC_TAGS; do
	src_set_vars "$TAG"

	if [ "$TAG" = "installed" ]; then
		ZFS_VERSION=$(modinfo zfs | awk '/version:/ { print $2; exit }')
		if [ -n "$ZFS_VERSION" ]; then
			printf "%-16s" "$ZFS_VERSION"
		else
			fail "ZFS is not installed"
		fi
	else
		printf "%-16s" "$TAG"
	fi
done
echo -e "\n-----------------------------------------------------------------"

#
# Attempt to generate the tarball from your local git repository, if that
# fails then attempt to download the tarball from Github.
#
printf "%-16s" "Clone ZFS"
for TAG in $SRC_TAGS; do
	src_set_vars "$TAG"

	if [ -d "$ZFS_DIR" ]; then
		skip_nonewline
	elif  [ "$ZFS_TAG" = "installed" ]; then
		skip_nonewline
	else
		cd "$SRC_DIR" || fail "Failed 'cd $SRC_DIR'"

		if [ ! -d "$SRC_DIR_ZFS" ]; then
			mkdir -p "$SRC_DIR_ZFS"
		fi

		git archive --format=tar --prefix="$ZFS_TAG/ $ZFS_TAG" \
		    -o "$SRC_DIR_ZFS/$ZFS_TAG.tar" &>/dev/null || \
		    rm "$SRC_DIR_ZFS/$ZFS_TAG.tar"
		if [ -s "$SRC_DIR_ZFS/$ZFS_TAG.tar" ]; then
			tar -xf "$SRC_DIR_ZFS/$ZFS_TAG.tar" -C "$SRC_DIR_ZFS"
			rm "$SRC_DIR_ZFS/$ZFS_TAG.tar"
			echo -n -e "${COLOR_GREEN}Local${COLOR_RESET}\t\t"
		else
			mkdir -p "$ZFS_DIR" || fail "Failed to create $ZFS_DIR"
			curl -sL "$ZFS_URL" | tar -xz -C "$ZFS_DIR" \
			    --strip-components=1 || \
			    fail "Failed to download $ZFS_URL"
			echo -n -e "${COLOR_GREEN}Remote${COLOR_RESET}\t\t"
		fi
	fi
done
printf "\n"

# Build the listed tags
printf "%-16s" "Build ZFS"
for TAG in $SRC_TAGS; do
	src_set_vars "$TAG"

	if [ -f "$ZFS_DIR/module/zfs/zfs.ko" ]; then
		skip_nonewline
	elif  [ "$ZFS_TAG" = "installed" ]; then
		skip_nonewline
	else
		cd "$ZFS_DIR" || fail "Failed 'cd $ZFS_DIR'"
		make distclean &>/dev/null
		./autogen.sh >>"$CONFIG_LOG" 2>&1 || \
		    fail "Failed ZFS 'autogen.sh'"
		# shellcheck disable=SC2086
		./configure $CONFIG_OPTIONS >>"$CONFIG_LOG" 2>&1 || \
		    fail "Failed ZFS 'configure $CONFIG_OPTIONS'"
		# shellcheck disable=SC2086
		make $MAKE_OPTIONS >>"$MAKE_LOG" 2>&1 || \
		    fail "Failed ZFS 'make $MAKE_OPTIONS'"
		pass_nonewline
	fi
done
printf "\n"
echo "-----------------------------------------------------------------"

# Either create a new pool using 'zpool create', or alternately restore an
# existing pool from another ZFS implementation for compatibility testing.
for TAG in $POOL_TAGS; do
	pool_set_vars "$TAG"
	SKIP=0

	printf "%-16s" "$POOL_TAG"
	rm -Rf "$POOL_DIR"
	mkdir -p "$POOL_DIR_PRISTINE"

	# Use the existing compressed image if available.
	if [ -f "$POOL_BZIP" ]; then
		tar -xjf "$POOL_BZIP" -C "$POOL_DIR_PRISTINE" \
		    --strip-components=1 || \
		    fail "Failed 'tar -xjf $POOL_BZIP"
	# Use the installed version to create the pool.
	elif  [ "$TAG" = "installed" ]; then
		pool_create "$TAG"
	# A source build is available to create the pool.
	elif [ -d "$POOL_DIR_SRC" ]; then
		pool_create "$TAG"
	else
		SKIP=1
	fi

	# Verify 'zpool import' works for all listed source versions.
	for SRC_TAG in $SRC_TAGS; do

		if [ $SKIP -eq 1 ]; then
			skip_nonewline
			continue
		fi

		src_set_vars "$SRC_TAG"
		if [ "$SRC_TAG" != "installed" ]; then
			cd "$ZFS_DIR" || fail "Failed 'cd $ZFS_DIR'"
		fi
		$ZFS_SH zfs="spa_config_path=$POOL_DIR_COPY"

		cp -a --sparse=always "$POOL_DIR_PRISTINE" \
		    "$POOL_DIR_COPY" || \
		    fail "Failed to copy $POOL_DIR_PRISTINE to $POOL_DIR_COPY"
		POOL_NAME=$($ZPOOL_CMD import -d "$POOL_DIR_COPY" | \
		    awk '/pool:/ { print $2; exit 0 }')

		$ZPOOL_CMD import -N -d "$POOL_DIR_COPY" \
		   "$POOL_NAME" &>/dev/null
		# shellcheck disable=SC2181
		if [ $? -ne 0 ]; then
			fail_nonewline
			ERROR=1
		else
			$ZPOOL_CMD export "$POOL_NAME" || \
			    fail "Failed to export pool"
			pass_nonewline
		fi

		rm -Rf "$POOL_DIR_COPY"

		$ZFS_SH -u || fail "Failed to unload kmods"
	done
	printf "\n"
done

if [ "$KEEP" = "no" ]; then
	rm -Rf "$TEST_DIR"
fi

exit $ERROR