repotest: refactor shellcheck slightly

Refactor the shellcheck implementation so that:
   1. Files are checked by extension if their `file` type doesn't
      match a known list.

   Some shell scripts do not use the proper shebang and end up not being
   detected by `file`; attempt to revert to extension in that case.

   2. Facilitate easier addition of multiple linting tools for other
      file types.

   A follow up commit will add 'json' linting with only a few changes.

Signed-off-by: Patrick Williams <[email protected]>
Change-Id: I5ce60432c4bd123d9d9c14466505c2d4b2477959

Author: williamspatrick

meta-phosphor/scripts/run-repotest

@@ -87,6 +87,7 @@ meta-ampere/meta-jade/recipes-ampere/platform/ampere-platform-init/ampere_platfo
 meta-ampere/meta-jade/recipes-ampere/platform/mtjade-gpio-config/ampere_gpio_utils.sh
 meta-ampere/meta-jade/recipes-ampere/platform/mtjade-utils/ampere_host_check.sh
 meta-ampere/meta-jade/recipes-ampere/platform/mtjade-utils/ampere_power_util.sh
+meta-ampere/meta-jade/recipes-ampere/platform/mtjade-utils/gpio-defs.sh
 meta-ampere/meta-jade/recipes-ampere/platform/mtjade-utils/gpio-lib.sh
 meta-ampere/meta-jade/recipes-phosphor/console/obmc-console/ampere_uartmux_ctrl.sh
 meta-ampere/meta-jade/recipes-phosphor/console/obmc-console/obmc-console-server-setup.sh
@@ -119,6 +120,10 @@ meta-google/recipes-google/ncsi/files/gbmc-ncsi-ip-from-ra.sh.in
 meta-google/recipes-google/networking/files/gbmc-ip-monitor-test.sh
 meta-google/recipes-google/networking/files/gbmc-ip-monitor.sh
 meta-google/recipes-google/networking/files/gbmc-mac-config.sh.in
+meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-from-ra.sh
+meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-gw-src.sh
+meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-nft.sh
+meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-ula.sh
 meta-google/recipes-google/networking/google-usb-network/usb_network.sh
 meta-google/recipes-google/networking/google-usb-network/usb_network_test.sh
 meta-google/recipes-google/networking/network-sh/lib.sh
@@ -144,6 +149,7 @@ meta-ibm/recipes-phosphor/mboxd/mboxd/check_pnor_format.sh
 meta-ingrasys/meta-zaius/recipes-phosphor/chassis/avsbus-control/zaius_avsbus.sh
 meta-ingrasys/meta-zaius/recipes-phosphor/chassis/vcs-control/zaius_vcs.sh
 meta-inventec/meta-transformers/recipes-phosphor/init/transformers-init/transformers-init.sh
+meta-openpower/recipes-bsp/pdata/files/power-target.sh
 meta-openpower/recipes-phosphor/dump/phosphor-debug-collector/plugins.d/guard
 meta-openpower/recipes-phosphor/network/first-boot-set-hostname/first-boot-set-hostname.sh
 meta-openpower/recipes-phosphor/network/first-boot-set-mac/first-boot-set-mac.sh
@@ -173,13 +179,27 @@ meta-quanta/meta-gsj/recipes-gsj/quanta-nvme-powerctrl/files/nvme_powerctrl_libr
 meta-quanta/meta-gsj/recipes-gsj/quanta-nvme-powerctrl/files/nvme_powermanager.sh
 meta-quanta/meta-gsj/recipes-gsj/usb-network/files/usb_network.sh
 meta-quanta/meta-gsj/recipes-phosphor/fans/phosphor-pid-control/fan-control.sh
+meta-quanta/meta-gsj/recipes-phosphor/fans/phosphor-pid-control/fan-default-speed.sh
 meta-quanta/meta-olympus-nuvoton/recipes-olympus-nuvoton/power/first-boot-set-psu/first-boot-set-psu.sh
+meta-quanta/meta-olympus-nuvoton/recipes-phosphor/fans/phosphor-pid-control/fan-full-speed.sh
 meta-quanta/meta-q71l/recipes-phosphor/quanta-powerctrl/files/init_once.sh
 meta-quanta/meta-q71l/recipes-phosphor/quanta-powerctrl/files/poweroff.sh
 meta-quanta/meta-q71l/recipes-phosphor/quanta-powerctrl/files/poweron.sh
 meta-yadro/meta-nicole/recipes-phosphor/chassis/avsbus-control/avsbus-control.sh
 "
 
+types=(shell)
+# shellcheck disable=SC2034
+check_shell="shellcheck -x"
+
+for t in "${types[@]}"; do
+    check_cmd="check_${t}"
+    if ! which "${!check_cmd%% *}" > /dev/null 2>&1; then
+        eval "${check_cmd}=\"echo WARNING: Skipping $t due to missing command:\""
+        echo "${!check_cmd}"
+    fi
+done
+
 non_bbfiles=$(git ls-files -- \
   ':!:poky/**' \
   ':!:meta-security/**' \
@@ -188,22 +208,34 @@ non_bbfiles=$(git ls-files -- \
   | grep -v -e "\.patch$" -e "\.bb$" -e "\.bbappend$")
 
 for f in $non_bbfiles; do
-    file_type=$(file "$f")
-    case $file_type in
+    unset file_type
+    file_info=$(file "$f")
+    case $file_info in
         *shell\ script*)
-            if ! shellcheck -x "$f"; then
-                if [[ $lint_exempt == *$f* ]]; then
-                    echo "EXEMPT: $f"
-                else
-                    echo "FAILED: $f"
-                    false
-                fi
-            fi
+            file_type="shell"
             ;;
 
         *)
-            ;;
+            case $f in
+                *.sh)
+                    file_type="shell"
+                    ;;
+
+            esac
     esac
+
+    if [ -n "$file_type" ]; then
+        check_cmd="check_${file_type}"
+        if ! eval "${!check_cmd} $f"; then
+            if [[ $lint_exempt == *$f* ]]; then
+                echo "EXEMPT: $f"
+            else
+                echo "FAILED: $f"
+                false
+            fi
+        fi
+    fi
+
 done
 
 echo "Repo test passed"