Enable shellcheck to run for select scripts

Enable shellcheck to run on zed scripts,
paxcheck.sh, zfs-tests.sh, zfs.sh, and zloop.sh.

Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: Tony Hutter <[email protected]>
Signed-off-by: Giuseppe Di Natale <[email protected]>
Closes #5812 

5 files changed, 69 insertions, 75 deletions

diff --git a/scripts/common.sh.in b/scripts/common.sh.in
index 38fc6985a..e1a9b82d2 100644
--- a/scripts/common.sh.in
+++ b/scripts/common.sh.in
@@ -21,7 +21,6 @@ VERBOSE=
 VERBOSE_FLAG=
 FORCE=
 FORCE_FLAG=
-DUMP_LOG=
 ERROR=
 RAID0S=()
 RAID10S=()
@@ -155,17 +154,6 @@ init() {
 	populate $SRC_DIR 10 100
 }
 
-spl_dump_log() {
-	${SYSCTL} -w kernel.spl.debug.dump=1 &>/dev/null
-	local NAME=`dmesg | tail -n 1 | cut -f5 -d' '`
-	${SPLBUILD}/cmd/spl ${NAME} >${NAME}.log
-	echo
-	echo "Dumped debug log: ${NAME}.log"
-	tail -n1 ${NAME}.log
-	echo
-	return 0
-}
-
 check_modules() {
 	local LOADED_MODULES=()
 	local MISSING_MODULES=()
@@ -265,11 +253,6 @@ unload_modules() {
 				egrep "^${NAME} "| ${AWK} '{print $3}'`
 
 		if [ "${USE_COUNT}" = 0 ] ; then
-
-			if [ "${DUMP_LOG}" -a ${NAME} = "spl" ]; then
-				spl_dump_log
-			fi
-
 			unload_module ${MOD} || return 1
 		fi
 	done
diff --git a/scripts/paxcheck.sh b/scripts/paxcheck.sh
index 1d85f9d01..87e817500 100755
--- a/scripts/paxcheck.sh
+++ b/scripts/paxcheck.sh
@@ -1,5 +1,6 @@
 #!/bin/sh
 
+# shellcheck disable=SC2039
 if ! type scanelf > /dev/null 2>&1; then
     echo "scanelf (from pax-utils) is required for these checks." >&2
     exit 3
@@ -8,7 +9,7 @@ fi
 RET=0
 
 # check for exec stacks
-OUT="$(scanelf -qyRAF '%e %p' $1)"
+OUT=$(scanelf -qyRAF '%e %p' "$1")
 
 if [ x"${OUT}" != x ]; then
     RET=2
@@ -24,7 +25,7 @@ fi
 
 
 # check for TEXTRELS
-OUT="$(scanelf -qyRAF '%T %p' $1)"
+OUT=$(scanelf -qyRAF '%T %p' "$1")
 
 if [ x"${OUT}" != x ]; then
     RET=2
diff --git a/scripts/zfs-tests.sh b/scripts/zfs-tests.sh
index f06d6a1ab..72876a65b 100755
--- a/scripts/zfs-tests.sh
+++ b/scripts/zfs-tests.sh
@@ -20,7 +20,7 @@
 #
 # CDDL HEADER END
 #
-basedir="$(dirname $0)"
+basedir=$(dirname "$0")
 
 SCRIPT_COMMON=common.sh
 if [ -f "${basedir}/${SCRIPT_COMMON}" ]; then
@@ -29,7 +29,7 @@ else
 echo "Missing helper script ${SCRIPT_COMMON}" && exit 1
 fi
 
-. $STF_SUITE/include/default.cfg
+. "$STF_SUITE/include/default.cfg"
 
 PROG=zfs-tests.sh
 SUDO=/usr/bin/sudo
@@ -58,24 +58,24 @@ cleanup() {
 
 	if [ $LOOPBACK -eq 1 ]; then
 		for TEST_LOOPBACK in ${LOOPBACKS}; do
-			LOOP_DEV=$(basename $TEST_LOOPBACK)
-			DM_DEV=$(${SUDO} ${DMSETUP} ls 2>/dev/null | \
-			    grep ${LOOP_DEV} | cut -f1)
+			LOOP_DEV=$(basename "$TEST_LOOPBACK")
+			DM_DEV=$(${SUDO} "${DMSETUP}" ls 2>/dev/null | \
+			    grep "${LOOP_DEV}" | cut -f1)
 
 			if [ -n "$DM_DEV" ]; then
-				${SUDO} ${DMSETUP} remove ${DM_DEV} ||
+				${SUDO} "${DMSETUP}" remove "${DM_DEV}" ||
 				    echo "Failed to remove: ${DM_DEV}"
 			fi
 
 			if [ -n "${TEST_LOOPBACK}" ]; then
-				${SUDO} ${LOSETUP} -d ${TEST_LOOPBACK} ||
+				${SUDO} "${LOSETUP}" -d "${TEST_LOOPBACK}" ||
 				    echo "Failed to remove: ${TEST_LOOPBACK}"
 			fi
 		done
 	fi
 
 	for TEST_FILE in ${FILES}; do
-		rm -f ${TEST_FILE} &>/dev/null
+		rm -f "${TEST_FILE}" &>/dev/null
 	done
 }
 trap cleanup EXIT
@@ -87,29 +87,32 @@ trap cleanup EXIT
 # be dangerous and should only be used in a dedicated test environment.
 #
 cleanup_all() {
-	local TEST_POOLS=$(${SUDO} ${ZPOOL} list -H -o name | grep testpool)
-	local TEST_LOOPBACKS=$(${SUDO} ${LOSETUP} -a|grep file-vdev|cut -f1 -d:)
-	local TEST_FILES=$(ls /var/tmp/file-vdev* 2>/dev/null)
+	local TEST_POOLS
+	TEST_POOLS=$(${SUDO} "${ZPOOL}" list -H -o name | grep testpool)
+	local TEST_LOOPBACKS
+	TEST_LOOPBACKS=$(${SUDO} "${LOSETUP}" -a|grep file-vdev|cut -f1 -d:)
+	local TEST_FILES
+	TEST_FILES=$(ls /var/tmp/file-vdev* 2>/dev/null)
 
 	msg
 	msg "--- Cleanup ---"
-	msg "Removing pool(s):     $(echo ${TEST_POOLS} | tr '\n' ' ')"
+	msg "Removing pool(s):     $(echo "${TEST_POOLS}" | tr '\n' ' ')"
 	for TEST_POOL in $TEST_POOLS; do
-		${SUDO} ${ZPOOL} destroy ${TEST_POOL}
+		${SUDO} "${ZPOOL}" destroy "${TEST_POOL}"
 	done
 
-	msg "Removing dm(s):       $(${SUDO} ${DMSETUP} ls |
+	msg "Removing dm(s):       $(${SUDO} "${DMSETUP}" ls |
 	    grep loop | tr '\n' ' ')"
-	${SUDO} ${DMSETUP} remove_all
+	${SUDO} "${DMSETUP}" remove_all
 
-	msg "Removing loopback(s): $(echo ${TEST_LOOPBACKS} | tr '\n' ' ')"
+	msg "Removing loopback(s): $(echo "${TEST_LOOPBACKS}" | tr '\n' ' ')"
 	for TEST_LOOPBACK in $TEST_LOOPBACKS; do
-		${SUDO} ${LOSETUP} -d ${TEST_LOOPBACK}
+		${SUDO} "${LOSETUP}" -d "${TEST_LOOPBACK}"
 	done
 
-	msg "Removing files(s):    $(echo ${TEST_FILES} | tr '\n' ' ')"
+	msg "Removing files(s):    $(echo "${TEST_FILES}" | tr '\n' ' ')"
 	for TEST_FILE in $TEST_FILES; do
-		${SUDO} rm -f ${TEST_FILE}
+		${SUDO} rm -f "${TEST_FILE}"
 	done
 }
 
@@ -193,6 +196,7 @@ while getopts 'hvqxkfd:s:r:?t:u:' OPTION; do
 		exit 1
 		;;
 	v)
+		# shellcheck disable=SC2034
 		VERBOSE=1
 		;;
 	q)
@@ -300,11 +304,11 @@ fi
 # be a normal user account, needs to be configured such that it can
 # run commands via sudo passwordlessly.
 #
-if [ $(id -u) = "0" ]; then
+if [ "$(id -u)" = "0" ]; then
 	fail "This script must not be run as root."
 fi
 
-if [ $(sudo whoami) != "root" ]; then
+if [ "$(sudo whoami)" != "root" ]; then
 	fail "Passwordless sudo access required."
 fi
 
@@ -318,7 +322,7 @@ fi
 #
 # Verify the ZFS module stack if loaded.
 #
-${SUDO} ${ZFS_SH} &>/dev/null
+${SUDO} "${ZFS_SH}" &>/dev/null
 
 #
 # Attempt to cleanup all previous state for a new test run.
@@ -331,7 +335,7 @@ fi
 # By default preserve any existing pools
 #
 if [ -z "${KEEP}" ]; then
-	KEEP=$(${SUDO} ${ZPOOL} list -H -o name)
+	KEEP=$(${SUDO} "${ZPOOL}" list -H -o name)
 	if [ -z "${KEEP}" ]; then
 		KEEP="rpool"
 	fi
@@ -356,7 +360,7 @@ if [ -z "${DISKS}" ]; then
 	#
 	for TEST_FILE in ${FILES}; do
 		[ -f "$TEST_FILE" ] && fail "Failed file exists: ${TEST_FILE}"
-		truncate -s ${FILESIZE} ${TEST_FILE} ||
+		truncate -s "${FILESIZE}" "${TEST_FILE}" ||
 		    fail "Failed creating: ${TEST_FILE} ($?)"
 		DISKS="$DISKS$TEST_FILE "
 	done
@@ -369,17 +373,18 @@ if [ -z "${DISKS}" ]; then
 		check_loop_utils
 
 		for TEST_FILE in ${FILES}; do
-			TEST_LOOPBACK=$(${SUDO} ${LOSETUP} -f)
-			${SUDO} ${LOSETUP} ${TEST_LOOPBACK} ${TEST_FILE} ||
+			TEST_LOOPBACK=$(${SUDO} "${LOSETUP}" -f)
+			${SUDO} "${LOSETUP}" "${TEST_LOOPBACK}" "${TEST_FILE}" ||
 			    fail "Failed: ${TEST_FILE} -> ${TEST_LOOPBACK}"
 			LOOPBACKS="${LOOPBACKS}${TEST_LOOPBACK} "
-			DISKS="$DISKS$(basename $TEST_LOOPBACK) "
+			BASELOOPBACKS=$(basename "$TEST_LOOPBACK")
+			DISKS="$DISKS$BASELOOPBACKS "
 		done
 	fi
 fi
 
-NUM_DISKS=$(echo ${DISKS} | $AWK '{print NF}')
-[ $NUM_DISKS -lt 3 ] && fail "Not enough disks ($NUM_DISKS/3 minimum)"
+NUM_DISKS=$(echo "${DISKS}" | $AWK '{print NF}')
+[ "$NUM_DISKS" -lt 3 ] && fail "Not enough disks ($NUM_DISKS/3 minimum)"
 
 #
 # Disable SELinux until the ZFS Test Suite has been updated accordingly.
@@ -404,7 +409,7 @@ export KEEP
 export __ZFS_POOL_EXCLUDE
 
 msg "${TEST_RUNNER} ${QUIET} -c ${RUNFILE} -i ${STF_SUITE}"
-${TEST_RUNNER} ${QUIET} -c ${RUNFILE} -i ${STF_SUITE}
+${TEST_RUNNER} ${QUIET} -c "${RUNFILE}" -i "${STF_SUITE}"
 RESULT=$?
 echo
 
diff --git a/scripts/zfs.sh b/scripts/zfs.sh
index 55584ddd1..2ffcf40da 100755
--- a/scripts/zfs.sh
+++ b/scripts/zfs.sh
@@ -2,7 +2,7 @@
 #
 # A simple script to simply the loading/unloading the ZFS module stack.
 
-basedir="$(dirname $0)"
+basedir=$(dirname "$0")
 
 SCRIPT_COMMON=common.sh
 if [ -f "${basedir}/${SCRIPT_COMMON}" ]; then
@@ -11,6 +11,7 @@ else
 echo "Missing helper script ${SCRIPT_COMMON}" && exit 1
 fi
 
+# shellcheck disable=SC2034
 PROG=zfs.sh
 UNLOAD=
 
@@ -26,7 +27,6 @@ OPTIONS:
 	-h      Show this message
 	-v      Verbose
 	-u      Unload modules
-	-d      Save debug log on unload
 
 MODULE-OPTIONS:
 	Must be of the from module="options", for example:
@@ -37,21 +37,19 @@ $0 zfs="zfs_prefetch_disable=1 zfs_mdcomp_disable=1"
 EOF
 }
 
-while getopts 'hvud' OPTION; do
+while getopts 'hvu' OPTION; do
 	case $OPTION in
 	h)
 		usage
 		exit 1
 		;;
 	v)
+		# shellcheck disable=SC2034
 		VERBOSE=1
 		;;
 	u)
 		UNLOAD=1
 		;;
-	d)
-		DUMP_LOG=1
-		;;
 	?)
 		usage
 		exit
@@ -59,7 +57,7 @@ while getopts 'hvud' OPTION; do
 	esac
 done
 
-if [ $(id -u) != 0 ]; then
+if [ "$(id -u)" != 0 ]; then
 	die "Must run as root"
 fi
 
diff --git a/scripts/zloop.sh b/scripts/zloop.sh
index 580fcfe40..3a6db40cf 100755
--- a/scripts/zloop.sh
+++ b/scripts/zloop.sh
@@ -20,7 +20,7 @@
 # Copyright (C) 2016 Lawrence Livermore National Security, LLC.
 #
 
-basedir="$(dirname $0)"
+basedir=$(dirname "$0")
 
 SCRIPT_COMMON=common.sh
 if [ -f "${basedir}/${SCRIPT_COMMON}" ]; then
@@ -29,6 +29,7 @@ else
 	echo "Missing helper script ${SCRIPT_COMMON}" && exit 1
 fi
 
+# shellcheck disable=SC2034
 PROG=zloop.sh
 
 DEFAULTWORKDIR=/var/tmp
@@ -56,8 +57,11 @@ function usage
 
 function or_die
 {
+	# shellcheck disable=SC2068
 	$@
+	# shellcheck disable=SC2181
 	if [[ $? -ne 0 ]]; then
+		# shellcheck disable=SC2145
 		echo "Command failed: $@"
 		exit 1
 	fi
@@ -76,14 +80,16 @@ fi
 
 function core_file
 {
+	# shellcheck disable=SC2012 disable=2086
         printf "%s" "$(ls -tr1 $coreglob 2> /dev/null | head -1)"
 }
 
 function core_prog
 {
 	prog=$ZTEST
-	core_id=$($GDB --batch -c $1 | grep "Core was generated by" | \
+	core_id=$($GDB --batch -c "$1" | grep "Core was generated by" | \
 	    tr  \' ' ')
+	# shellcheck disable=SC2076
 	if [[ "$core_id" =~ "zdb "  ]]; then
 		prog=$ZDB
 	fi
@@ -95,23 +101,23 @@ function store_core
 	core="$(core_file)"
 	if [[ $ztrc -ne 0 ]] || [[ -f "$core" ]]; then
 		coreid=$(date "+zloop-%y%m%d-%H%M%S")
-		foundcrashes=$(($foundcrashes + 1))
+		foundcrashes=$((foundcrashes + 1))
 
 		dest=$coredir/$coreid
-		or_die mkdir -p $dest
-		or_die mkdir -p $dest/vdev
+		or_die mkdir -p "$dest"
+		or_die mkdir -p "$dest/vdev"
 
 		echo "*** ztest crash found - moving logs to $dest"
 
-		or_die mv ztest.history $dest/
-		or_die mv ztest.ddt $dest/
-		or_die mv ztest.out $dest/
-		or_die mv $workdir/ztest* $dest/vdev/
-		or_die mv $workdir/zpool.cache $dest/vdev/
+		or_die mv ztest.history "$dest/"
+		or_die mv ztest.ddt "$dest/"
+		or_die mv ztest.out "$dest/"
+		or_die mv "$workdir/ztest*" "$dest/vdev/"
+		or_die mv "$workdir/zpool.cache" "$dest/vdev/"
 
 		# check for core
 		if [[ -f "$core" ]]; then
-			coreprog=$(core_prog $core)
+			coreprog=$(core_prog "$core")
 			corestatus=$($GDB --batch --quiet \
 			    -ex "set print thread-events off" \
 			    -ex "printf \"*\n* Backtrace \n*\n\"" \
@@ -124,11 +130,11 @@ function store_core
 			    -ex "thread apply all bt" \
 			    -ex "printf \"*\n* Backtraces (full) \n*\n\"" \
 			    -ex "thread apply all bt full" \
-			    -ex "quit" $coreprog "$core" | grep -v "New LWP")
+			    -ex "quit" "$coreprog" "$core" | grep -v "New LWP")
 
 			# Dump core + logs to stored directory
-			echo "$corestatus" >>$dest/status
-			or_die mv "$core" $dest/
+			echo "$corestatus" >>"$dest/status"
+			or_die mv "$core" "$dest/"
 
 			# Record info in cores logfile
 			echo "*** core @ $coredir/$coreid/$core:" | \
@@ -149,7 +155,7 @@ while getopts ":ht:c:f:" opt; do
 	case $opt in
 		t ) [[ $OPTARG -gt 0 ]] && timeout=$OPTARG ;;
 		c ) [[ $OPTARG ]] && coredir=$OPTARG ;;
-		f ) [[ $OPTARG ]] && workdir=$(readlink -f $OPTARG) ;;
+		f ) [[ $OPTARG ]] && workdir=$(readlink -f "$OPTARG") ;;
 		h ) usage
 		    exit 2
 		    ;;
@@ -166,13 +172,13 @@ ulimit -c unlimited
 
 if [[ -f "$(core_file)" ]]; then
 	echo -n "There's a core dump here you might want to look at first... "
-	echo "$(core_file)"
+	core_file
 	exit 1
 fi
 
 if [[ ! -d $coredir ]]; then
 	echo "core dump directory ($coredir) does not exist, creating it."
-	or_die mkdir -p $coredir
+	or_die mkdir -p "$coredir"
 fi
 
 if [[ ! -w $coredir ]]; then
@@ -190,7 +196,7 @@ starttime=$(date +%s)
 curtime=$starttime
 
 # if no timeout was specified, loop forever.
-while [[ $timeout -eq 0 ]] || [[ $curtime -le $(($starttime + $timeout)) ]]; do
+while [[ $timeout -eq 0 ]] || [[ $curtime -le $((starttime + timeout)) ]]; do
 	zopt="-VVVVV"
 
 	# switch between common arrangements & fully randomized
@@ -220,6 +226,7 @@ while [[ $timeout -eq 0 ]] || [[ $curtime -le $(($starttime + $timeout)) ]]; do
 	zopt="$zopt -s $size"
 	zopt="$zopt -f $workdir"
 
+	# shellcheck disable=SC2124
 	cmd="$ZTEST $zopt $@"
 	desc="$(date '+%m/%d %T') $cmd"
 	echo "$desc" | tee -a ztest.history
@@ -227,7 +234,7 @@ while [[ $timeout -eq 0 ]] || [[ $curtime -le $(($starttime + $timeout)) ]]; do
 	$cmd >>ztest.out 2>&1
 	ztrc=$?
 	egrep '===|WARNING' ztest.out >>ztest.history
-	$ZDB -U $workdir/zpool.cache -DD ztest >>ztest.ddt
+	$ZDB -U "$workdir/zpool.cache" -DD ztest >>ztest.ddt
 
 	store_core