Only compare OS versions if `dig` was successful

Signed-off-by: RD WebDesign <github@rdwebdesign.com.br>

advanced/Scripts/piholeDebug.sh

@@ -394,41 +394,46 @@ os_check() {
     # Extract dig response
     response="${cmdResult%%$'\n'*}"
 
-    IFS=" " read -r -a supportedOS < <(echo "${response}" | tr -d '"')
-    for distro_and_versions in "${supportedOS[@]}"
-    do
-        distro_part="${distro_and_versions%%=*}"
-        versions_part="${distro_and_versions##*=}"
-
-        if [[ "${detected_os^^}" =~ ${distro_part^^} ]]; then
-            valid_os=true
-            IFS="," read -r -a supportedVer <<<"${versions_part}"
-            for version in "${supportedVer[@]}"
-            do
-                if [[ "${detected_version}" =~ $version ]]; then
-                    valid_version=true
-                    break
-                fi
-            done
-            break
-        fi
-    done
-
     log_write "${INFO} dig return code:  ${digReturnCode}"
     log_write "${INFO} dig response:  ${response}"
 
-    if [ "$valid_os" = true ]; then
-        log_write "${TICK} Distro:  ${COL_GREEN}${detected_os^}${COL_NC}"
+    if [ "${response}" -ne 0 ]; then
+        log_write "${CROSS} Distro: ${COL_RED}${detected_os^}${COL_NC}"
+        log_write "${CROSS} Error:  ${COL_RED}dig command failed - Unable to check OS${COL_NC}"
+    else
+        IFS=" " read -r -a supportedOS < <(echo "${response}" | tr -d '"')
+        for distro_and_versions in "${supportedOS[@]}"
+        do
+            distro_part="${distro_and_versions%%=*}"
+            versions_part="${distro_and_versions##*=}"
+
+            if [[ "${detected_os^^}" =~ ${distro_part^^} ]]; then
+                valid_os=true
+                IFS="," read -r -a supportedVer <<<"${versions_part}"
+                for version in "${supportedVer[@]}"
+                do
+                    if [[ "${detected_version}" =~ $version ]]; then
+                        valid_version=true
+                        break
+                    fi
+                done
+                break
+            fi
+        done
+
+        if [ "$valid_os" = true ]; then
+            log_write "${TICK} Distro:  ${COL_GREEN}${detected_os^}${COL_NC}"
 
-        if [ "$valid_version" = true ]; then
-            log_write "${TICK} Version: ${COL_GREEN}${detected_version}${COL_NC}"
+            if [ "$valid_version" = true ]; then
+                log_write "${TICK} Version: ${COL_GREEN}${detected_version}${COL_NC}"
+            else
+                log_write "${CROSS} Version: ${COL_RED}${detected_version}${COL_NC}"
+                log_write "${CROSS} Error: ${COL_RED}${detected_os^} is supported but version ${detected_version} is currently unsupported (${FAQ_HARDWARE_REQUIREMENTS})${COL_NC}"
+            fi
         else
-            log_write "${CROSS} Version: ${COL_RED}${detected_version}${COL_NC}"
-            log_write "${CROSS} Error: ${COL_RED}${detected_os^} is supported but version ${detected_version} is currently unsupported (${FAQ_HARDWARE_REQUIREMENTS})${COL_NC}"
+            log_write "${CROSS} Distro:  ${COL_RED}${detected_os^}${COL_NC}"
+            log_write "${CROSS} Error: ${COL_RED}${detected_os^} is not a supported distro (${FAQ_HARDWARE_REQUIREMENTS})${COL_NC}"
         fi
-    else
-        log_write "${CROSS} Distro:  ${COL_RED}${detected_os^}${COL_NC}"
-        log_write "${CROSS} Error: ${COL_RED}${detected_os^} is not a supported distro (${FAQ_HARDWARE_REQUIREMENTS})${COL_NC}"
     fi
 }