Trim excess shellcheck annotations. Widen to all non-Korn scripts

Before, make shellcheck checked
  scripts/{commitcheck,make_gitrev,man-dates,paxcheck,zfs-helpers,zfs,
           zfs-tests,zimport,zloop}.sh
  cmd/zed/zed.d/{{all-debug,all-syslog,data-notify,generic-notify,
                 resilver_finish-start-scrub,scrub_finish-notify,
                 statechange-led,statechange-notify,trim_finish-notify,
                 zed-functions}.sh,history_event-zfs-list-cacher.sh.in}
  cmd/zpool/zpool.d/{dm-deps,iostat,lsblk,media,ses,smart,upath}
now it also checks
  contrib/dracut/{02zfsexpandknowledge/module-setup,
                  90zfs/{export-zfs,parse-zfs,zfs-needshutdown,
                         zfs-load-key,zfs-lib,module-setup,
                         mount-zfs,zfs-generator}}.sh.in
  cmd/zed/zed.d/{pool_import-led,vdev_attach-led,
                 resilver_finish-notify,vdev_clear-led}.sh
  contrib/initramfs/{zfsunlock,hooks/zfs.in,scripts/local-top/zfs}
  tests/zfs-tests/tests/perf/scripts/prefetch_io.sh
  scripts/common.sh.in
  contrib/bpftrace/zfs-trace.sh
  autogen.sh

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

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

@@ -14,21 +14,16 @@ get_pool_devices() {
   local poolconfigtemp
   local poolconfigoutput
   local pooldev
-  local prefix
   local resolved
-  poolconfigtemp=`mktemp`
+  poolconfigtemp="$(mktemp)"
   if ! @sbindir@/zpool list -v -H -P "$1" > "$poolconfigtemp" 2>&1 ; then
-    poolconfigoutput=$(cat "$poolconfigtemp")
+    poolconfigoutput="$(cat "$poolconfigtemp")"
     dinfo "zfsexpandknowledge: pool $1 cannot be listed: $poolconfigoutput"
   else
-    cat "$poolconfigtemp" |  awk -F '\t' '/\t\/dev/ { print $2 }' | \
-    while read pooldev ; do
-        if [ -n "$pooldev" -a -e "$pooldev" ] ; then
-          if [ -h "$pooldev" ] ; then
-              resolved=`readlink -f "$pooldev"`
-          else
-              resolved="$pooldev"
-          fi
+    awk -F '\t' '/\t\/dev/ { print $2 }' "$poolconfigtemp" | \
+    while read -r pooldev ; do
+        if [ -e "$pooldev" ] ; then
+          resolved="$(readlink -f "$pooldev")"
           dinfo "zfsexpandknowledge: pool $1 has device $pooldev (which resolves to $resolved)"
           echo "$resolved"
         fi
@@ -39,22 +34,20 @@ get_pool_devices() {
 
 find_zfs_block_devices() {
     local dev
-    local blockdev
     local mp
     local fstype
     local pool
-    local key
-    local n
-    local poolconfigoutput
-    numfields=`head -1 /proc/self/mountinfo | awk '{print NF}'`
-    if [ "$numfields" == "10" ] ; then
-        fields="n n n n mp n n fstype dev n"
+    local _
+    numfields="$(awk '{print NF; exit}' /proc/self/mountinfo)"
+    if [ "$numfields" = "10" ] ; then
+        fields="_ _ _ _ mp _ _ fstype dev _"
     else
-        fields="n n n n mp n n n fstype dev n"
+        fields="_ _ _ _ mp _ _ _ fstype dev _"
     fi
-    while read $fields ; do
-       if [ "$fstype" != "zfs" ]; then continue ; fi
-       if [ "$mp" == "$1" ]; then
+    # shellcheck disable=SC2086
+    while read -r ${fields?} ; do
+       [ "$fstype" = "zfs" ] || continue
+       if [ "$mp" = "$1" ]; then
            pool=$(echo "$dev" | cut -d / -f 1)
            get_pool_devices "$pool"
        fi
@@ -76,10 +69,9 @@ check() {
     local _depdev
     local _depdevname
     local _depdevtype
-    local _depmajmin
-    local _dev
 
-if [[ $hostonly ]]; then
+# shellcheck disable=SC2154
+if [ -n "$hostonly" ]; then
 
     for mp in \
         "/" \
@@ -106,13 +98,12 @@ if [[ $hostonly ]]; then
             fstype=$(get_devtype "$dev")
             host_fs_types["$dev"]="$fstype"
             majmin=$(get_maj_min "$dev")
-            if [[ -d /sys/dev/block/$majmin/slaves ]] ; then
-                for _depdev in /sys/dev/block/$majmin/slaves/*; do
+            if [ -d "/sys/dev/block/$majmin/slaves" ] ; then
+                for _depdev in "/sys/dev/block/$majmin/slaves"/*; do
                     [[ -f $_depdev/dev ]] || continue
                     _depdev=/dev/$(basename "$_depdev")
                     _depdevname=$(udevadm info --query=property --name="$_depdev" | grep "^DEVNAME=" | sed 's|^DEVNAME=||')
                     _depdevtype=$(get_devtype "$_depdevname")
-                    _depmajmin=$(get_maj_min "$_depdevname")
                     dinfo "zfsexpandknowledge: underlying block device backing ZFS dataset $mp: ${_depdevname//$'\n'/ }"
                     array_contains "$_depdevname" "${host_devs[@]}" || host_devs+=("$_depdevname")
                     host_fs_types["$_depdevname"]="$_depdevtype"

contrib/dracut/90zfs/module-setup.sh.in

@@ -1,4 +1,5 @@
 #!/usr/bin/env bash
+# shellcheck disable=SC2154
 
 check() {
 	# We depend on udev-rules being loaded

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

@@ -1,4 +1,5 @@
 #!/bin/sh
+# shellcheck disable=SC2034,SC2154
 
 . /lib/dracut-zfs-lib.sh
 
@@ -39,6 +40,7 @@ udevadm settle
 
 if [ "${root}" = "zfs:AUTO" ] ; then
 	if ! ZFS_DATASET="$(find_bootfs)" ; then
+		# shellcheck disable=SC2086
 		zpool import -N -a ${ZPOOL_IMPORT_OPTS}
 		if ! ZFS_DATASET="$(find_bootfs)" ; then
 			warn "ZFS: No bootfs attribute found in importable pools."

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

@@ -1,4 +1,5 @@
 #!/bin/sh
+# shellcheck disable=SC2034,SC2154
 
 . /lib/dracut-lib.sh
 
@@ -28,7 +29,7 @@ case "${root}" in
 		info "ZFS: Enabling autodetection of bootfs after udev settles."
 		;;
 
-	ZFS\=*|zfs:*|zfs:FILESYSTEM\=*|FILESYSTEM\=*)
+	ZFS=*|zfs:*|FILESYSTEM=*)
 		# root is explicit ZFS root.  Parse it now.  We can handle
 		# a root=... param in any of the following formats:
 		# root=ZFS=rpool/ROOT

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

@@ -1,4 +1,5 @@
 #!/bin/sh
+# shellcheck disable=SC2016,SC1004
 
 grep -wq debug /proc/cmdline && debug=1
 [ -n "$debug" ] && echo "zfs-generator: starting" >> /dev/kmsg

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

@@ -59,6 +59,7 @@ import_pool() {
 
     if ! zpool list -H "${pool}" > /dev/null 2>&1; then
         info "ZFS: Importing pool ${pool}..."
+        # shellcheck disable=SC2086
         if ! zpool import -N ${ZPOOL_IMPORT_OPTS} "${pool}" ; then
             warn "ZFS: Unable to import pool ${pool}"
             return 1
@@ -123,13 +124,12 @@ for_relevant_root_children() {
 # export_all OPTS
 #   exports all imported zfs pools.
 export_all() {
-    opts="${@}"
     ret=0
 
     IFS="${NEWLINE}"
     for pool in $(zpool list -H -o name) ; do
         if zpool list -H "${pool}" > /dev/null 2>&1; then
-            zpool export "${pool}" ${opts} || ret=$?
+            zpool export "${pool}" "$@" || ret=$?
         fi
     done
     IFS="${OLDIFS}"

contrib/dracut/90zfs/zfs-load-key.sh.in

@@ -1,4 +1,5 @@
 #!/bin/sh
+# shellcheck disable=SC2154
 
 # only run this on systemd systems, we handle the decrypt in mount-zfs.sh in the mount hook otherwise
 [ -e /bin/systemctl ] || [ -e /usr/bin/systemctl ] || return 0

contrib/initramfs/hooks/zfs.in

@@ -26,7 +26,7 @@ fi
 
 # We use pthreads, but i-t from buster doesn't automatically
 # copy this indirect dependency: this can be removed when buster finally dies.
-for libgcc in $(find /lib/ -type f -name libgcc_s.so.[1-9]); do
+find /lib/ -type f -name "libgcc_s.so.[1-9]" | while read -r libgcc; do
 	copy_exec "$libgcc"
 done
 

contrib/initramfs/scripts/local-top/zfs

@@ -1,18 +1,11 @@
 #!/bin/sh
-PREREQ="mdadm mdrun multipath"
+# shellcheck disable=SC2154
 
-prereqs()
-{
-        echo "$PREREQ"
-}
 
-case $1 in
-# get pre-requisites
-prereqs)
-        prereqs
+if [ "$1" = "prereqs" ]; then
+        echo mdadm mdrun multipath
         exit 0
-        ;;
-esac
+fi
 
 
 #
@@ -20,10 +13,10 @@ esac
 #
 message()
 {
-        if [ -x /bin/plymouth ] && plymouth --ping; then
-                plymouth message --text="$@"
+        if plymouth --ping 2>/dev/null; then
+                plymouth message --text="$*"
         else
-                echo "$@" >&2
+                echo "$*" >&2
         fi
         return 0
 }