Fix SC2181 ("[ $?") outside tests/

Reviewed-by: John Kennedy <john.kennedy@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #12042

cmd/zed/zed.d/zed-functions.sh

@@ -127,9 +127,7 @@ zed_lock()
     # Obtain a lock on the file bound to the given file descriptor.
     #
     eval "exec ${fd}> '${lockfile}'"
-    err="$(flock --exclusive "${fd}" 2>&1)"
-    # shellcheck disable=SC2181
-    if [ $? -ne 0 ]; then
+    if ! err="$(flock --exclusive "${fd}" 2>&1)"; then
         zed_log_err "failed to lock \"${lockfile}\": ${err}"
     fi
 
@@ -165,9 +163,7 @@ zed_unlock()
     fi
 
     # Release the lock and close the file descriptor.
-    err="$(flock --unlock "${fd}" 2>&1)"
-    # shellcheck disable=SC2181
-    if [ $? -ne 0 ]; then
+    if ! err="$(flock --unlock "${fd}" 2>&1)"; then
         zed_log_err "failed to unlock \"${lockfile}\": ${err}"
     fi
     eval "exec ${fd}>&-"

config/ax_python_devel.m4

@@ -148,8 +148,7 @@ variable to configure. See ``configure --help'' for reference.
 	# Check if you have distutils, else fail
 	#
 	AC_MSG_CHECKING([for the distutils Python package])
-	ac_distutils_result=`$PYTHON -c "import distutils" 2>&1`
-	if test $? -eq 0; then
+	if ac_distutils_result=`$PYTHON -c "import distutils" 2>&1`; then
 		AC_MSG_RESULT([yes])
 	else
 		AC_MSG_RESULT([no])

contrib/dracut/02zfsexpandknowledge/module-setup.sh.in

@@ -17,8 +17,7 @@ get_pool_devices() {
   local prefix
   local resolved
   poolconfigtemp=`mktemp`
-  @sbindir@/zpool list -v -H -P "$1" > "$poolconfigtemp" 2>&1
-  if [ "$?" != "0" ] ; then
+  if ! @sbindir@/zpool list -v -H -P "$1" > "$poolconfigtemp" 2>&1 ; then
     poolconfigoutput=$(cat "$poolconfigtemp")
     dinfo "zfsexpandknowledge: pool $1 cannot be listed: $poolconfigoutput"
   else

contrib/dracut/90zfs/mount-zfs.sh.in

@@ -38,11 +38,9 @@ modprobe zfs 2>/dev/null
 udevadm settle
 
 if [ "${root}" = "zfs:AUTO" ] ; then
-	ZFS_DATASET="$(find_bootfs)"
-	if [ $? -ne 0 ] ; then
+	if ! ZFS_DATASET="$(find_bootfs)" ; then
 		zpool import -N -a ${ZPOOL_IMPORT_OPTS}
-		ZFS_DATASET="$(find_bootfs)"
-		if [ $? -ne 0 ] ; then
+		if ! ZFS_DATASET="$(find_bootfs)" ; then
 			warn "ZFS: No bootfs attribute found in importable pools."
 			export_all -F
 

contrib/dracut/90zfs/zfs-lib.sh.in

@@ -5,12 +5,8 @@ command -v getargbool >/dev/null || {
     # Compatibility with older Dracut versions.
     # With apologies to the Dracut developers.
     getargbool() {
-        if ! [ -z "$_b" ]; then
-                unset _b
-        fi
         _default="$1"; shift
-        _b=$(getarg "$@")
-        [ $? -ne 0 ] &&  [ -z "$_b" ] && _b="$_default"
+        ! _b=$(getarg "$@") && [ -z "$_b" ] && _b="$_default"
         if [ -n "$_b" ]; then
             [ "$_b" = "0" ] && return 1
             [ "$_b" = "no" ] && return 1

etc/init.d/zfs-zed.in

@@ -61,20 +61,16 @@ do_stop()
 	check_module_loaded "zfs" || exit 0
 
 	zfs_action "Stopping ZFS Event Daemon" zfs_daemon_stop \
-	   "$ZED_PIDFILE" "$ZED" "$ZED_NAME"
-	if [ "$?" -eq "0" ]
+	   "$ZED_PIDFILE" "$ZED" "$ZED_NAME" || return "$?"
+
+	# Let's see if we have any pools imported
+	pools=$("$ZPOOL" list -H -oname)
+	if [ -z "$pools" ]
 	then
-		# Let's see if we have any pools imported
-		pools=$("$ZPOOL" list -H -oname)
-		if [ -z "$pools" ]
-		then
-			# No pools imported, it is/should be safe/possible to
-			# unload modules.
-			zfs_action "Unloading modules" rmmod zfs zunicode \
-			    zavl zcommon znvpair zlua spl
-			return "$?"
-		fi
-	else
+		# No pools imported, it is/should be safe/possible to
+		# unload modules.
+		zfs_action "Unloading modules" rmmod zfs zunicode \
+		    zavl zcommon znvpair zlua spl
 		return "$?"
 	fi
 }

etc/zfs/zfs-functions.in

@@ -182,15 +182,17 @@ zfs_daemon_stop()
 		# LSB functions
 		start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 \
 		    --pidfile "$PIDFILE" --name "$DAEMON_NAME"
-		[ "$?" = 0 ] && rm -f "$PIDFILE"
+		ret="$?"
+		[ "$ret" = 0 ] && rm -f "$PIDFILE"
 
-		return $?
+		return "$ret"
 	elif type killproc > /dev/null 2>&1 ; then
 		# Fedora/RedHat functions
 		killproc -p "$PIDFILE" "$DAEMON_NAME"
-		[ "$?" = 0 ] && rm -f "$PIDFILE"
+		ret="$?"
+		[ "$ret" = 0 ] && rm -f "$PIDFILE"
 
-		return $?
+		return "$ret"
 	else
 		# Unsupported
 		return 3
@@ -371,7 +373,7 @@ in_mtab()
 	local mntpnt="$1"
 	# Remove 'unwanted' characters.
 	mntpnt=$(printf '%b\n' "$mntpnt" | sed -e 's,/,,g' \
-	    -e 's,-,,g' -e 's,\.,,g' -e 's, ,,g')   
+	    -e 's,-,,g' -e 's,\.,,g' -e 's, ,,g')
 	local var
 
 	var="$(eval echo MTAB_$mntpnt)"

scripts/commitcheck.sh

@@ -87,9 +87,7 @@ coverity_fix_commit()
     IFS='
 '
     for line in $(git log -n 1 --pretty=%b "$REF" | grep -E '^CID'); do
-        echo "$line" | grep -E '^CID [[:digit:]]+: ([[:graph:]]+|[[:space:]])+ \(([[:upper:]]|\_)+\)' > /dev/null
-        # shellcheck disable=SC2181
-        if [ $? -ne 0 ]; then
+        if ! echo "$line" | grep -qE '^CID [[:digit:]]+: ([[:graph:]]+|[[:space:]])+ \(([[:upper:]]|\_)+\)'; then
             echo "error: commit message has an improperly formatted CID defect line"
             error=1
         fi

scripts/zfs.sh

@@ -120,9 +120,7 @@ load_module_linux() {
 		echo "Loading: $FILE ($VERSION)"
 	fi
 
-	$LDMOD "$KMOD" >/dev/null 2>&1
-	# shellcheck disable=SC2181
-	if [ $? -ne 0 ]; then
+	if ! $LDMOD "$KMOD" >/dev/null 2>&1; then
 		echo "Failed to load $KMOD"
 		return 1
 	fi

scripts/zimport.sh

@@ -491,10 +491,8 @@ for TAG in $POOL_TAGS; do
 		POOL_NAME=$($ZPOOL_CMD import -d "$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
+		if ! $ZPOOL_CMD import -N -d "$POOL_DIR_COPY"
+		    "$POOL_NAME" &>/dev/null; then
 			fail_nonewline
 			ERROR=1
 		else

scripts/zloop.sh

@@ -62,11 +62,8 @@ function usage
 function or_die
 {
 	# shellcheck disable=SC2068
-	$@
-	# shellcheck disable=SC2181
-	if [[ $? -ne 0 ]]; then
-		# shellcheck disable=SC2145
-		echo "Command failed: $@"
+	if ! $@; then
+		echo "Command failed: $*"
 		exit 1
 	fi
 }