diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
new file mode 100644
index 00000000..58192bc1
--- /dev/null
+++ b/.github/CODEOWNERS
@@ -0,0 +1,5 @@
+# see https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners#codeowners-syntax
+
+# These owners will be the default owners for everything in
+# the repo. Unless a later match takes precedence,
+*       @pi-hole/core-maintainers
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index e140f792..af9b74db 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -8,8 +8,6 @@ updates:
     time: "10:00"
   open-pull-requests-limit: 10
   target-branch: development
-  reviewers:
-    - "pi-hole/core-maintainers"
 - package-ecosystem: pip
   directory: "/test"
   schedule:
@@ -18,5 +16,3 @@ updates:
     time: "10:00"
   open-pull-requests-limit: 10
   target-branch: development
-  reviewers:
-    - "pi-hole/core-maintainers"
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 43cd8ad4..ac496406 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -19,6 +19,8 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4.2.2
+        with:
+          fetch-depth: 0 # Differential ShellCheck requires full git history
 
       - name: Check scripts in repository are executable
         run: |
@@ -28,12 +30,12 @@ jobs:
           # If FAIL is 1 then we fail.
           [[ $FAIL == 1 ]] && exit 1 || echo "Scripts are executable!"
 
-      - name: Run shellcheck
-        uses: ludeeus/action-shellcheck@master
+      - name: Differential ShellCheck
+        uses: redhat-plumbers-in-action/differential-shellcheck@v5
         with:
-          check_together: 'yes'
-          format: tty
-          severity: error
+          severity: warning
+          display-engine: sarif-fmt
+
 
       - name: Spell-Checking
         uses: codespell-project/actions-codespell@master
@@ -67,8 +69,10 @@ jobs:
             ubuntu_22,
             ubuntu_24,
             centos_9,
+            centos_10,
             fedora_40,
             fedora_41,
+            fedora_42,
           ]
     env:
       DISTRO: ${{matrix.distro}}
@@ -77,7 +81,7 @@ jobs:
         uses: actions/checkout@v4.2.2
 
       - name: Set up Python 3.10
-        uses: actions/setup-python@v5.5.0
+        uses: actions/setup-python@v5.6.0
         with:
           python-version: "3.10"
 
diff --git a/.gitignore b/.gitignore
index 8016472b..6322fd3e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,3 +10,6 @@ __pycache__
 .idea/
 *.iml
 .vscode/
+.venv/
+.fleet/
+.cache/
diff --git a/.shellcheckrc b/.shellcheckrc
new file mode 100644
index 00000000..8e0b8387
--- /dev/null
+++ b/.shellcheckrc
@@ -0,0 +1,2 @@
+external-sources=true # allow shellcheck to read external sources
+disable=SC3043 #disable SC3043: In POSIX sh, local is undefined.
diff --git a/README.md b/README.md
index f320f8c5..622ff202 100644
--- a/README.md
+++ b/README.md
@@ -128,7 +128,10 @@ Some of the statistics you can integrate include:
 - Queries cached
 - Unique clients
 
-Access the API via [`telnet`](https://github.com/pi-hole/FTL), the Web (`admin/api.php`) and Command Line (`pihole -c -j`). You can find out [more details over here](https://discourse.pi-hole.net/t/pi-hole-api/1863).
+Access the API using:
+- your browser: http://pi.hole/api/docs
+- `curl`: `curl --connect-timeout 2 -ks "https://pi.hole/api/stats/summary" -H "Accept: application/json"`;
+- the command line - examples: `pihole api config/webserver/port` or `pihole api stats/summary`.
 
 ### The Command-Line Interface
 
diff --git a/advanced/Scripts/api.sh b/advanced/Scripts/api.sh
index 79fc90f4..613a8d86 100755
--- a/advanced/Scripts/api.sh
+++ b/advanced/Scripts/api.sh
@@ -1,5 +1,4 @@
 #!/usr/bin/env sh
-# shellcheck disable=SC3043 #https://github.com/koalaman/shellcheck/wiki/SC3043#exceptions
 
 # Pi-hole: A black hole for Internet advertisements
 # (c) 2017 Pi-hole, LLC (https://pi-hole.net)
@@ -20,13 +19,19 @@
 
 TestAPIAvailability() {
 
+    local chaos_api_list authResponse authStatus authData apiAvailable DNSport
+
     # as we are running locally, we can get the port value from FTL directly
-    local chaos_api_list authResponse authStatus authData
+    readonly utilsfile="${PI_HOLE_SCRIPT_DIR}/utils.sh"
+    # shellcheck source=./advanced/Scripts/utils.sh
+    . "${utilsfile}"
+
+    DNSport=$(getFTLConfigValue dns.port)
 
     # Query the API URLs from FTL using CHAOS TXT local.api.ftl
     # The result is a space-separated enumeration of full URLs
     # e.g., "http://localhost:80/api/" "https://localhost:443/api/"
-    chaos_api_list="$(dig +short chaos txt local.api.ftl @127.0.0.1)"
+    chaos_api_list="$(dig +short -p "${DNSport}" chaos txt local.api.ftl @127.0.0.1)"
 
     # If the query was not successful, the variable is empty
     if [ -z "${chaos_api_list}" ]; then
@@ -48,48 +53,50 @@ TestAPIAvailability() {
         API_URL="${API_URL%\"}"
         API_URL="${API_URL#\"}"
 
-        # Test if the API is available at this URL
-        authResponse=$(curl --connect-timeout 2 -skS -w "%{http_code}" "${API_URL}auth")
+        # Test if the API is available at this URL, include delimiter for ease in splitting payload
+        authResponse=$(curl --connect-timeout 2 -skS -w ">>%{http_code}" "${API_URL}auth")
 
-        # authStatus are the last 3 characters
-        # not using ${authResponse#"${authResponse%???}"}" here because it's extremely slow on big responses
-        authStatus=$(printf "%s" "${authResponse}" | tail -c 3)
-        # data is everything from response without the last 3 characters
-        authData=$(printf %s "${authResponse%???}")
+        # authStatus is the response http_code, eg. 200, 401.
+        # Shell parameter expansion, remove everything up to and including the >> delim
+        authStatus=${authResponse#*>>}
+        # data is everything from response
+        # Shell parameter expansion, remove the >> delim and everything after
+        authData=${authResponse%>>*}
 
         # Test if http status code was 200 (OK) or 401 (authentication required)
-        if [ ! "${authStatus}" = 200 ] && [ ! "${authStatus}" = 401 ]; then
-            # API is not available at this port/protocol combination
-            API_PORT=""
-        else
-            # API is available at this URL combination
-
-            if [ "${authStatus}" = 200 ]; then
-                # API is available without authentication
-                needAuth=false
-            fi
+        if [ "${authStatus}" = 200 ]; then
+            # API is available without authentication
+            apiAvailable=true
+            needAuth=false
+            break
 
+        elif [ "${authStatus}" = 401 ]; then
+            # API is available with authentication
+            apiAvailable=true
+            needAuth=true
             # Check if 2FA is required
             needTOTP=$(echo "${authData}"| jq --raw-output .session.totp 2>/dev/null)
-
             break
-        fi
 
-        # Remove the first URL from the list
-        local last_api_list
-        last_api_list="${chaos_api_list}"
-        chaos_api_list="${chaos_api_list#* }"
+        else
+            # API is not available at this port/protocol combination
+            apiAvailable=false
+            # Remove the first URL from the list
+            local last_api_list
+            last_api_list="${chaos_api_list}"
+            chaos_api_list="${chaos_api_list#* }"
 
-        # If the list did not change, we are at the last element
-        if [ "${last_api_list}" = "${chaos_api_list}" ]; then
-            # Remove the last element
-            chaos_api_list=""
+            # If the list did not change, we are at the last element
+            if [ "${last_api_list}" = "${chaos_api_list}" ]; then
+                # Remove the last element
+                chaos_api_list=""
+            fi
         fi
     done
 
-    # if API_PORT is empty, no working API port was found
-    if [ -n "${API_PORT}" ]; then
-        echo "API not available at: ${API_URL}"
+    # if apiAvailable is false, no working API was found
+    if [ "${apiAvailable}" = false ]; then
+        echo "API not available. Please check FTL.log"
         echo "Exiting."
         exit 1
     fi
@@ -227,7 +234,7 @@ GetFTLData() {
     # return only the data
     if [ "${status}" = 200 ]; then
         # response OK
-        echo "${data}"
+        printf %s "${data}"
     else
         # connection lost
         echo "${status}"
@@ -301,14 +308,23 @@ secretRead() {
 }
 
 apiFunc() {
-  local data response status status_col
+  local data response status status_col verbosity
+
+  # Define if the output will be silent (default) or verbose
+  verbosity="silent"
+  if [ "$1" = "verbose" ]; then
+    verbosity="verbose"
+    shift
+  fi
 
   # Authenticate with the API
-  LoginAPI verbose
-  echo ""
+  LoginAPI "${verbosity}"
 
-  echo "Requesting: ${COL_PURPLE}GET ${COL_CYAN}${API_URL}${COL_YELLOW}$1${COL_NC}"
-  echo ""
+  if [ "${verbosity}" = "verbose" ]; then
+    echo ""
+    echo "Requesting: ${COL_PURPLE}GET ${COL_CYAN}${API_URL}${COL_YELLOW}$1${COL_NC}"
+    echo ""
+  fi
 
   # Get the data from the API
   response=$(GetFTLData "$1" raw)
@@ -325,11 +341,18 @@ apiFunc() {
   else
     status_col="${COL_RED}"
   fi
-  echo "Status: ${status_col}${status}${COL_NC}"
+
+  # Only print the status in verbose mode or if the status is not 200
+  if [ "${verbosity}" = "verbose" ] || [ "${status}" != 200 ]; then
+    echo "Status: ${status_col}${status}${COL_NC}"
+  fi
 
   # Output the data. Format it with jq if available and data is actually JSON.
   # Otherwise just print it
-  echo "Data:"
+  if [ "${verbosity}" = "verbose" ]; then
+    echo "Data:"
+  fi
+
   if command -v jq >/dev/null && echo "${data}" | jq . >/dev/null 2>&1; then
     echo "${data}" | jq .
   else
@@ -337,5 +360,5 @@ apiFunc() {
   fi
 
   # Delete the session
-  LogoutAPI verbose
+  LogoutAPI "${verbosity}"
 }
diff --git a/advanced/Scripts/database_migration/gravity-db.sh b/advanced/Scripts/database_migration/gravity-db.sh
index b0982bcc..41593368 100755
--- a/advanced/Scripts/database_migration/gravity-db.sh
+++ b/advanced/Scripts/database_migration/gravity-db.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# shellcheck disable=SC1090
+
 
 # Pi-hole: A black hole for Internet advertisements
 # (c) 2019 Pi-hole, LLC (https://pi-hole.net)
@@ -13,9 +13,8 @@
 readonly scriptPath="/etc/.pihole/advanced/Scripts/database_migration/gravity"
 
 upgrade_gravityDB(){
-    local database piholeDir version
+    local database version
     database="${1}"
-    piholeDir="${2}"
 
     # Exit early if the database does not exist (e.g. in CI tests)
     if [[ ! -f "${database}" ]]; then
diff --git a/advanced/Scripts/list.sh b/advanced/Scripts/list.sh
index 5c57f878..fa356f16 100755
--- a/advanced/Scripts/list.sh
+++ b/advanced/Scripts/list.sh
@@ -1,5 +1,4 @@
 #!/usr/bin/env bash
-# shellcheck disable=SC1090
 
 # Pi-hole: A black hole for Internet advertisements
 # (c) 2017 Pi-hole, LLC (https://pi-hole.net)
@@ -12,9 +11,11 @@
 
 readonly PI_HOLE_SCRIPT_DIR="/opt/pihole"
 readonly utilsfile="${PI_HOLE_SCRIPT_DIR}/utils.sh"
+# shellcheck source="./advanced/Scripts/utils.sh"
 source "${utilsfile}"
 
 readonly apifile="${PI_HOLE_SCRIPT_DIR}/api.sh"
+# shellcheck source="./advanced/Scripts/api.sh"
 source "${apifile}"
 
 # Determine database location
@@ -39,6 +40,7 @@ typeId=""
 comment=""
 
 colfile="/opt/pihole/COL_TABLE"
+# shellcheck source="./advanced/Scripts/COL_TABLE"
 source ${colfile}
 
 helpFunc() {
diff --git a/advanced/Scripts/piholeARPTable.sh b/advanced/Scripts/piholeARPTable.sh
index f55b1320..120df5b8 100755
--- a/advanced/Scripts/piholeARPTable.sh
+++ b/advanced/Scripts/piholeARPTable.sh
@@ -1,5 +1,4 @@
 #!/usr/bin/env bash
-# shellcheck disable=SC1090
 
 # Pi-hole: A black hole for Internet advertisements
 # (c) 2019 Pi-hole, LLC (https://pi-hole.net)
@@ -12,13 +11,22 @@
 
 coltable="/opt/pihole/COL_TABLE"
 if [[ -f ${coltable} ]]; then
+# shellcheck source="./advanced/Scripts/COL_TABLE"
     source ${coltable}
 fi
 
 readonly PI_HOLE_SCRIPT_DIR="/opt/pihole"
 utilsfile="${PI_HOLE_SCRIPT_DIR}/utils.sh"
+# shellcheck source=./advanced/Scripts/utils.sh
 source "${utilsfile}"
 
+readonly PI_HOLE_FILES_DIR="/etc/.pihole"
+SKIP_INSTALL="true"
+# shellcheck source="./automated install/basic-install.sh"
+source "${PI_HOLE_FILES_DIR}/automated install/basic-install.sh"
+# stop_service() is defined in basic-install.sh
+# restart_service() is defined in basic-install.sh
+
 # Determine database location
 DBFILE=$(getFTLConfigValue "files.database")
 if [ -z "$DBFILE" ]; then
@@ -32,7 +40,7 @@ flushARP(){
     fi
 
     # Stop FTL to prevent database access
-    if ! output=$(service pihole-FTL stop 2>&1); then
+    if ! output=$(stop_service pihole-FTL 2>&1); then
         echo -e "${OVER}  ${CROSS} Failed to stop FTL"
         echo "  Output: ${output}"
         return 1
@@ -64,7 +72,7 @@ flushARP(){
     fi
 
     # Start FTL again
-    if ! output=$(service pihole-FTL restart 2>&1); then
+    if ! output=$(restart_service pihole-FTL 2>&1); then
         echo -e "${OVER}  ${CROSS} Failed to restart FTL"
         echo "  Output: ${output}"
         return 1
diff --git a/advanced/Scripts/piholeCheckout.sh b/advanced/Scripts/piholeCheckout.sh
index 84c966df..beaac5f1 100755
--- a/advanced/Scripts/piholeCheckout.sh
+++ b/advanced/Scripts/piholeCheckout.sh
@@ -10,6 +10,7 @@
 
 readonly PI_HOLE_FILES_DIR="/etc/.pihole"
 SKIP_INSTALL="true"
+# shellcheck source="./automated install/basic-install.sh"
 source "${PI_HOLE_FILES_DIR}/automated install/basic-install.sh"
 
 # webInterfaceGitUrl set in basic-install.sh
@@ -109,7 +110,7 @@ checkout() {
             echo -e "${OVER}  ${CROSS} $str"
             exit 1
         fi
-        corebranches=($(get_available_branches "${PI_HOLE_FILES_DIR}"))
+        mapfile -t corebranches < <(get_available_branches "${PI_HOLE_FILES_DIR}")
 
         if [[ "${corebranches[*]}" == *"master"* ]]; then
             echo -e "${OVER}  ${TICK} $str"
@@ -136,7 +137,7 @@ checkout() {
             echo -e "${OVER}  ${CROSS} $str"
             exit 1
         fi
-        webbranches=($(get_available_branches "${webInterfaceDir}"))
+        mapfile -t webbranches < <(get_available_branches "${webInterfaceDir}")
 
         if [[ "${webbranches[*]}" == *"master"* ]]; then
             echo -e "${OVER}  ${TICK} $str"
@@ -167,7 +168,7 @@ checkout() {
 
         # Check if requested branch is available
         echo -e "  ${INFO} Checking for availability of branch ${COL_CYAN}${2}${COL_NC} on GitHub"
-        ftlbranches=( $(git ls-remote https://github.com/pi-hole/ftl | grep "refs/heads" | cut -d'/' -f3- -) )
+        mapfile -t ftlbranches < <(git ls-remote https://github.com/pi-hole/ftl | grep "refs/heads" | cut -d'/' -f3- -)
         # If returned array is empty -> connectivity issue
         if [[ ${#ftlbranches[@]} -eq 0 ]]; then
             echo -e "  ${CROSS} Unable to fetch branches from GitHub. Please check your Internet connection and try again later."
@@ -209,13 +210,15 @@ checkout() {
             # Update local and remote versions via updatechecker
             /opt/pihole/updatecheck.sh
         else
-            if [ $? -eq 1 ]; then
+            local status
+            status=$?
+            if [ $status -eq 1 ]; then
                 # Binary for requested branch is not available, may still be
                 # int he process of being built or CI build job failed
-                printf "  %b Binary for requested branch is not available, please try again later.\\n" ${CROSS}
+                printf "  %b Binary for requested branch is not available, please try again later.\\n" "${CROSS}"
                 printf "      If the issue persists, please contact Pi-hole Support and ask them to re-generate the binary.\\n"
                 exit 1
-            elif [ $? -eq 2 ]; then
+            elif [ $status -eq 2 ]; then
                 printf "  %b Unable to download from ftl.pi-hole.net. Please check your Internet connection and try again later.\\n" "${CROSS}"
                 exit 1
             else
diff --git a/advanced/Scripts/piholeDebug.sh b/advanced/Scripts/piholeDebug.sh
index f4226299..741ff2f4 100755
--- a/advanced/Scripts/piholeDebug.sh
+++ b/advanced/Scripts/piholeDebug.sh
@@ -8,7 +8,6 @@
 # This file is copyright under the latest version of the EUPL.
 # Please see LICENSE file for your rights under this license.
 
-# shellcheck source=/dev/null
 
 # -e option instructs bash to immediately exit if any command [1] has a non-zero exit status
 # -u a reference to any variable you haven't previously defined
@@ -27,6 +26,7 @@ PIHOLE_COLTABLE_FILE="${PIHOLE_SCRIPTS_DIRECTORY}/COL_TABLE"
 
 # These provide the colors we need for making the log more readable
 if [[ -f ${PIHOLE_COLTABLE_FILE} ]]; then
+# shellcheck source=./advanced/Scripts/COL_TABLE
     source ${PIHOLE_COLTABLE_FILE}
 else
     COL_NC='\e[0m' # No Color
@@ -41,7 +41,7 @@ else
     #OVER="\r\033[K"
 fi
 
-# shellcheck disable=SC1091
+# shellcheck source=/dev/null
 . /etc/pihole/versions
 
 # Read the value of an FTL config key. The value is printed to stdout.
@@ -213,7 +213,7 @@ compare_local_version_to_git_version() {
             local local_status
             local_status=$(git status -s)
             # echo this information out to the user in a nice format
-            if [ ${local_version} ]; then
+            if [ "${local_version}" ]; then
               log_write "${TICK} Version: ${local_version}"
             elif [ -n "${DOCKER_VERSION}" ]; then
               log_write "${TICK} Version: Pi-hole Docker Container ${COL_BOLD}${DOCKER_VERSION}${COL_NC}"
@@ -296,91 +296,12 @@ check_component_versions() {
     check_ftl_version
 }
 
-os_check() {
-    # This function gets a list of supported OS versions from a TXT record at versions.pi-hole.net
-    # and determines whether or not the script is running on one of those systems
-    local remote_os_domain valid_os valid_version detected_os detected_version cmdResult digReturnCode response
-    remote_os_domain=${OS_CHECK_DOMAIN_NAME:-"versions.pi-hole.net"}
-
-    detected_os=$(grep "\bID\b" /etc/os-release | cut -d '=' -f2 | tr -d '"')
-    detected_version=$(grep VERSION_ID /etc/os-release | cut -d '=' -f2 | tr -d '"')
-
-    cmdResult="$(dig -4 +short -t txt "${remote_os_domain}" @ns1.pi-hole.net 2>&1; echo $?)"
-    #Get the return code of the previous command (last line)
-    digReturnCode="${cmdResult##*$'\n'}"
-
-    # Extract dig response
-    response="${cmdResult%%$'\n'*}"
-
-    if [ "${digReturnCode}" -ne 0 ]; then
-        log_write "${INFO} Distro: ${detected_os^}"
-        log_write "${INFO} Version: ${detected_version}"
-        log_write "${CROSS} dig IPv4 return code: ${COL_RED}${digReturnCode}${COL_NC}"
-        log_write "${CROSS} dig response: ${response}"
-        log_write "${INFO} Retrying via IPv6"
-
-        cmdResult="$(dig -6 +short -t txt "${remote_os_domain}" @ns1.pi-hole.net 2>&1; echo $?)"
-        #Get the return code of the previous command (last line)
-        digReturnCode="${cmdResult##*$'\n'}"
-
-        # Extract dig response
-        response="${cmdResult%%$'\n'*}"
-    fi
-    # If also no success via IPv6
-    if [ "${digReturnCode}" -ne 0 ]; then
-        log_write "${CROSS} dig IPv6 return code: ${COL_RED}${digReturnCode}${COL_NC}"
-        log_write "${CROSS} dig response: ${response}"
-        log_write "${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}" =~ $version ]]; then
-                        valid_version=true
-                        break
-                    fi
-                done
-                break
-            fi
-        done
-
-        # If it is a docker container, we can assume the OS is supported
-        [ -n "${DOCKER_VERSION}" ] && valid_os=true && valid_version=true
-
-        local finalmsg
-        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}${COL_NC}"
-                finalmsg="${TICK} ${COL_GREEN}Distro and version supported${COL_NC}"
-            else
-                log_write "${CROSS} Version: ${COL_RED}${detected_version}${COL_NC}"
-                finalmsg="${CROSS} Error: ${COL_RED}${detected_os^} is supported but version ${detected_version} is currently unsupported ${COL_NC}(${FAQ_HARDWARE_REQUIREMENTS})${COL_NC}"
-            fi
-        else
-            log_write "${CROSS} Distro:  ${COL_RED}${detected_os^}${COL_NC}"
-            finalmsg="${CROSS} Error: ${COL_RED}${detected_os^} is not a supported distro ${COL_NC}(${FAQ_HARDWARE_REQUIREMENTS})${COL_NC}"
-        fi
-
-        # Print dig response and the final check result
-        log_write "${TICK} dig return code: ${COL_GREEN}${digReturnCode}${COL_NC}"
-        log_write "${INFO} dig response: ${response}"
-        log_write "${finalmsg}"
-    fi
-}
-
 diagnose_operating_system() {
     # error message in a variable so we can easily modify it later (or reuse it)
     local error_msg="Distribution unknown -- most likely you are on an unsupported platform and may run into issues."
+    local detected_os
+    local detected_version
+
     # Display the current test that is running
     echo_current_diagnostic "Operating system"
 
@@ -389,8 +310,13 @@ diagnose_operating_system() {
 
     # If there is a /etc/*release file, it's probably a supported operating system, so we can
     if ls /etc/*release 1> /dev/null 2>&1; then
-        # display the attributes to the user from the function made earlier
-        os_check
+        # display the attributes to the user
+
+        detected_os=$(grep "\bID\b" /etc/os-release | cut -d '=' -f2 | tr -d '"')
+        detected_version=$(grep VERSION_ID /etc/os-release | cut -d '=' -f2 | tr -d '"')
+
+        log_write "${INFO} Distro: ${detected_os^}"
+        log_write "${INFO} Version: ${detected_version}"
     else
         # If it doesn't exist, it's not a system we currently support and link to FAQ
         log_write "${CROSS} ${COL_RED}${error_msg}${COL_NC} (${FAQ_HARDWARE_REQUIREMENTS})"
@@ -488,7 +414,9 @@ run_and_print_command() {
     local output
     output=$(${cmd} 2>&1)
     # If the command was successful,
-    if [[ $? -eq 0 ]]; then
+    local return_code
+    return_code=$?
+    if [[ "${return_code}" -eq 0 ]]; then
         # show the output
         log_write "${output}"
     else
@@ -933,7 +861,6 @@ parse_file() {
     # Get the lines that are in the file(s) and store them in an array for parsing later
     local file_info
     if [[ -f "$filename" ]]; then
-        #shellcheck disable=SC2016
         IFS=$'\r\n' command eval 'file_info=( $(cat "${filename}") )'
     else
         read -r -a file_info <<< "$filename"
diff --git a/advanced/Scripts/piholeLogFlush.sh b/advanced/Scripts/piholeLogFlush.sh
index 34d96318..ac0c196f 100755
--- a/advanced/Scripts/piholeLogFlush.sh
+++ b/advanced/Scripts/piholeLogFlush.sh
@@ -9,12 +9,20 @@
 # Please see LICENSE file for your rights under this license.
 
 colfile="/opt/pihole/COL_TABLE"
+# shellcheck source="./advanced/Scripts/COL_TABLE"
 source ${colfile}
 
 readonly PI_HOLE_SCRIPT_DIR="/opt/pihole"
 utilsfile="${PI_HOLE_SCRIPT_DIR}/utils.sh"
+# shellcheck source="./advanced/Scripts/utils.sh"
 source "${utilsfile}"
 
+SKIP_INSTALL="true"
+# shellcheck source="./automated install/basic-install.sh"
+source "${PI_HOLE_FILES_DIR}/automated install/basic-install.sh"
+# stop_service() is defined in basic-install.sh
+# restart_service() is defined in basic-install.sh
+
 # In case we're running at the same time as a system logrotate, use a
 # separate logrotate state file to prevent stepping on each other's
 # toes.
@@ -35,6 +43,46 @@ FTLFILE=$(getFTLConfigValue "files.log.ftl")
 if [ -z "$FTLFILE" ]; then
     FTLFILE="/var/log/pihole/FTL.log"
 fi
+WEBFILE=$(getFTLConfigValue "files.log.webserver")
+if [ -z "$WEBFILE" ]; then
+    WEBFILE="/var/log/pihole/webserver.log"
+fi
+
+# Helper function to handle log rotation for a single file
+rotate_log() {
+    # This function copies x.log over to x.log.1
+    # and then empties x.log
+    # Note that moving the file is not an option, as
+    # dnsmasq would happily continue writing into the
+    # moved file (it will have the same file handler)
+    local logfile="$1"
+    if [[ "$*" != *"quiet"* ]]; then
+        echo -ne "  ${INFO} Rotating ${logfile} ..."
+    fi
+    cp -p "${logfile}" "${logfile}.1"
+    echo " " > "${logfile}"
+    chmod 640 "${logfile}"
+    if [[ "$*" != *"quiet"* ]]; then
+        echo -e "${OVER}  ${TICK} Rotated ${logfile} ..."
+    fi
+}
+
+# Helper function to handle log flushing for a single file
+flush_log() {
+    local logfile="$1"
+    if [[ "$*" != *"quiet"* ]]; then
+        echo -ne "  ${INFO} Flushing ${logfile} ..."
+    fi
+    echo " " > "${logfile}"
+    chmod 640 "${logfile}"
+    if [ -f "${logfile}.1" ]; then
+        echo " " > "${logfile}.1"
+        chmod 640 "${logfile}.1"
+    fi
+    if [[ "$*" != *"quiet"* ]]; then
+        echo -e "${OVER}  ${TICK} Flushed ${logfile} ..."
+    fi
+}
 
 if [[ "$*" == *"once"* ]]; then
     # Nightly logrotation
@@ -46,75 +94,30 @@ if [[ "$*" == *"once"* ]]; then
         fi
         /usr/sbin/logrotate --force --state "${STATEFILE}" /etc/pihole/logrotate
     else
-        # Copy pihole.log over to pihole.log.1
-        # and empty out pihole.log
-        # Note that moving the file is not an option, as
-        # dnsmasq would happily continue writing into the
-        # moved file (it will have the same file handler)
-        if [[ "$*" != *"quiet"* ]]; then
-            echo -ne "  ${INFO} Rotating ${LOGFILE} ..."
-        fi
-        cp -p "${LOGFILE}" "${LOGFILE}.1"
-        echo " " > "${LOGFILE}"
-        chmod 640 "${LOGFILE}"
-        if [[ "$*" != *"quiet"* ]]; then
-            echo -e "${OVER}  ${TICK} Rotated ${LOGFILE} ..."
-        fi
-        # Copy FTL.log over to FTL.log.1
-        # and empty out FTL.log
-        if [[ "$*" != *"quiet"* ]]; then
-            echo -ne "  ${INFO} Rotating ${FTLFILE} ..."
-        fi
-        cp -p "${FTLFILE}" "${FTLFILE}.1"
-        echo " " > "${FTLFILE}"
-        chmod 640 "${FTLFILE}"
-        if [[ "$*" != *"quiet"* ]]; then
-            echo -e "${OVER}  ${TICK} Rotated ${FTLFILE} ..."
-        fi
+        # Handle rotation for each log file
+        rotate_log "${LOGFILE}"
+        rotate_log "${FTLFILE}"
+        rotate_log "${WEBFILE}"
     fi
 else
     # Manual flushing
-
-    # Flush both pihole.log and pihole.log.1 (if existing)
-    if [[ "$*" != *"quiet"* ]]; then
-        echo -ne "  ${INFO} Flushing ${LOGFILE} ..."
-    fi
-    echo " " > "${LOGFILE}"
-    chmod 640 "${LOGFILE}"
-    if [ -f "${LOGFILE}.1" ]; then
-        echo " " > "${LOGFILE}.1"
-        chmod 640 "${LOGFILE}.1"
-    fi
-    if [[ "$*" != *"quiet"* ]]; then
-        echo -e "${OVER}  ${TICK} Flushed ${LOGFILE} ..."
-    fi
-
-    # Flush both FTL.log and FTL.log.1 (if existing)
-    if [[ "$*" != *"quiet"* ]]; then
-        echo -ne "  ${INFO} Flushing ${FTLFILE} ..."
-    fi
-    echo " " > "${FTLFILE}"
-    chmod 640 "${FTLFILE}"
-    if [ -f "${FTLFILE}.1" ]; then
-        echo " " > "${FTLFILE}.1"
-        chmod 640 "${FTLFILE}.1"
-    fi
-    if [[ "$*" != *"quiet"* ]]; then
-        echo -e "${OVER}  ${TICK} Flushed ${FTLFILE} ..."
-    fi
+    flush_log "${LOGFILE}"
+    flush_log "${FTLFILE}"
+    flush_log "${WEBFILE}"
 
     if [[ "$*" != *"quiet"* ]]; then
         echo -ne "  ${INFO} Flushing database, DNS resolution temporarily unavailable ..."
     fi
 
     # Stop FTL to make sure it doesn't write to the database while we're deleting data
-    service pihole-FTL stop
+    stop_service pihole-FTL >/dev/null
+
 
     # Delete most recent 24 hours from FTL's database, leave even older data intact (don't wipe out all history)
     deleted=$(pihole-FTL sqlite3 -ni "${DBFILE}" "DELETE FROM query_storage WHERE timestamp >= strftime('%s','now')-86400; select changes() from query_storage limit 1")
 
     # Restart FTL
-    service pihole-FTL restart
+    restart_service pihole-FTL >/dev/null
     if [[ "$*" != *"quiet"* ]]; then
         echo -e "${OVER}  ${TICK} Deleted ${deleted} queries from long-term query database"
     fi
diff --git a/advanced/Scripts/query.sh b/advanced/Scripts/query.sh
index 3340bdd2..18c018dc 100755
--- a/advanced/Scripts/query.sh
+++ b/advanced/Scripts/query.sh
@@ -1,9 +1,4 @@
 #!/usr/bin/env sh
-# shellcheck disable=SC1090
-
-# Ignore warning about `local` being undefinded in POSIX
-# shellcheck disable=SC3043
-# https://github.com/koalaman/shellcheck/wiki/SC3043#exceptions
 
 # Pi-hole: A black hole for Internet advertisements
 # (c) 2023 Pi-hole, LLC (https://pi-hole.net)
@@ -22,9 +17,11 @@ domain=""
 
 # Source color table
 colfile="/opt/pihole/COL_TABLE"
+# shellcheck source="./advanced/Scripts/COL_TABLE"
 . "${colfile}"
 
 # Source api functions
+# shellcheck source="./advanced/Scripts/api.sh"
 . "${PI_HOLE_INSTALL_DIR}/api.sh"
 
 Help() {
diff --git a/advanced/Scripts/update.sh b/advanced/Scripts/update.sh
index 6c6167c0..51c1b1a1 100755
--- a/advanced/Scripts/update.sh
+++ b/advanced/Scripts/update.sh
@@ -12,26 +12,31 @@
 
 # Variables
 readonly ADMIN_INTERFACE_GIT_URL="https://github.com/pi-hole/web.git"
-readonly ADMIN_INTERFACE_DIR="/var/www/html/admin"
 readonly PI_HOLE_GIT_URL="https://github.com/pi-hole/pi-hole.git"
 readonly PI_HOLE_FILES_DIR="/etc/.pihole"
 
-# shellcheck disable=SC2034
 SKIP_INSTALL=true
 
 # when --check-only is passed to this script, it will not perform the actual update
 CHECK_ONLY=false
 
-# shellcheck disable=SC1090
+# shellcheck source="./automated install/basic-install.sh"
 source "${PI_HOLE_FILES_DIR}/automated install/basic-install.sh"
-# shellcheck disable=SC1091
+# shellcheck source=./advanced/Scripts/COL_TABLE
 source "/opt/pihole/COL_TABLE"
+# shellcheck source="./advanced/Scripts/utils.sh"
+source "${PI_HOLE_INSTALL_DIR}/utils.sh"
 
 # is_repo() sourced from basic-install.sh
 # make_repo() sourced from basic-install.sh
 # update_repo() source from basic-install.sh
 # getGitFiles() sourced from basic-install.sh
 # FTLcheckUpdate() sourced from basic-install.sh
+# getFTLConfigValue() sourced from utils.sh
+
+# Honour configured paths for the web application.
+ADMIN_INTERFACE_DIR=$(getFTLConfigValue "webserver.paths.webroot")$(getFTLConfigValue "webserver.paths.webhome")
+readonly ADMIN_INTERFACE_DIR
 
 GitCheckUpdateAvail() {
     local directory
@@ -107,8 +112,6 @@ main() {
     web_update=false
     FTL_update=false
 
-    # Perform an OS check to ensure we're on an appropriate operating system
-    os_check
 
     # Install packages used by this installation script (necessary if users have removed e.g. git from their systems)
     package_manager_detect
@@ -209,7 +212,7 @@ main() {
         echo ""
         echo -e "  ${INFO} Pi-hole Web Admin files out of date, updating local repo."
         getGitFiles "${ADMIN_INTERFACE_DIR}" "${ADMIN_INTERFACE_GIT_URL}"
-        echo -e "  ${INFO} If you had made any changes in '/var/www/html/admin/', they have been stashed using 'git stash'"
+        echo -e "  ${INFO} If you had made any changes in '${ADMIN_INTERFACE_DIR}', they have been stashed using 'git stash'"
     fi
 
     if [[ "${FTL_update}" == true ]]; then
diff --git a/advanced/Scripts/updatecheck.sh b/advanced/Scripts/updatecheck.sh
index b325ee9c..44f21419 100755
--- a/advanced/Scripts/updatecheck.sh
+++ b/advanced/Scripts/updatecheck.sh
@@ -39,9 +39,12 @@ function get_remote_hash() {
 }
 
 # Source the utils file for addOrEditKeyValPair()
-# shellcheck disable=SC1091
+# shellcheck source="./advanced/Scripts/utils.sh"
 . /opt/pihole/utils.sh
 
+ADMIN_INTERFACE_DIR=$(getFTLConfigValue "webserver.paths.webroot")$(getFTLConfigValue "webserver.paths.webhome")
+readonly ADMIN_INTERFACE_DIR
+
 # Remove the below three legacy files if they exist
 rm -f "/etc/pihole/GitHubVersions"
 rm -f "/etc/pihole/localbranches"
@@ -85,13 +88,13 @@ addOrEditKeyValPair "${VERSION_FILE}" "GITHUB_CORE_HASH" "${GITHUB_CORE_HASH}"
 
 # get Web versions
 
-WEB_VERSION="$(get_local_version /var/www/html/admin)"
+WEB_VERSION="$(get_local_version "${ADMIN_INTERFACE_DIR}")"
 addOrEditKeyValPair "${VERSION_FILE}" "WEB_VERSION" "${WEB_VERSION}"
 
-WEB_BRANCH="$(get_local_branch /var/www/html/admin)"
+WEB_BRANCH="$(get_local_branch "${ADMIN_INTERFACE_DIR}")"
 addOrEditKeyValPair "${VERSION_FILE}" "WEB_BRANCH" "${WEB_BRANCH}"
 
-WEB_HASH="$(get_local_hash /var/www/html/admin)"
+WEB_HASH="$(get_local_hash "${ADMIN_INTERFACE_DIR}")"
 addOrEditKeyValPair "${VERSION_FILE}" "WEB_HASH" "${WEB_HASH}"
 
 GITHUB_WEB_VERSION="$(get_remote_version web "${WEB_BRANCH}")"
diff --git a/advanced/Scripts/utils.sh b/advanced/Scripts/utils.sh
index 63d51f87..d4a6957c 100755
--- a/advanced/Scripts/utils.sh
+++ b/advanced/Scripts/utils.sh
@@ -1,5 +1,4 @@
 #!/usr/bin/env sh
-# shellcheck disable=SC3043 #https://github.com/koalaman/shellcheck/wiki/SC3043#exceptions
 
 # Pi-hole: A black hole for Internet advertisements
 # (c) 2017 Pi-hole, LLC (https://pi-hole.net)
@@ -88,8 +87,8 @@ getFTLConfigValue(){
 #######################
 setFTLConfigValue(){
   pihole-FTL --config "${1}" "${2}" >/dev/null
-  if [[ $? -eq 5 ]]; then
-    echo -e "  ${CROSS} ${1} set by environment variable. Please unset it to use this function"
+  if [ $? -eq 5 ]; then
+    printf "  %s %s set by environment variable. Please unset it to use this function\n" "${CROSS}" "${1}"
     exit 5
   fi
 }
diff --git a/advanced/Scripts/version.sh b/advanced/Scripts/version.sh
index 540924c2..e932fe63 100755
--- a/advanced/Scripts/version.sh
+++ b/advanced/Scripts/version.sh
@@ -8,20 +8,16 @@
 # This file is copyright under the latest version of the EUPL.
 # Please see LICENSE file for your rights under this license.
 
-# Ignore warning about `local` being undefinded in POSIX
-# shellcheck disable=SC3043
-# https://github.com/koalaman/shellcheck/wiki/SC3043#exceptions
-
 # Source the versions file populated by updatechecker.sh
 cachedVersions="/etc/pihole/versions"
 
 if [ -f ${cachedVersions} ]; then
-    # shellcheck disable=SC1090
+    # shellcheck source=/dev/null
     . "$cachedVersions"
 else
     echo "Could not find /etc/pihole/versions. Running update now."
     pihole updatechecker
-    # shellcheck disable=SC1090
+     # shellcheck source=/dev/null
     . "$cachedVersions"
 fi
 
diff --git a/advanced/Templates/gravity.db.sql b/advanced/Templates/gravity.db.sql
index 021f6f67..0187e4e6 100644
--- a/advanced/Templates/gravity.db.sql
+++ b/advanced/Templates/gravity.db.sql
@@ -43,8 +43,8 @@ CREATE TABLE adlist
 
 CREATE TABLE adlist_by_group
 (
-    adlist_id INTEGER NOT NULL REFERENCES adlist (id),
-    group_id INTEGER NOT NULL REFERENCES "group" (id),
+    adlist_id INTEGER NOT NULL REFERENCES adlist (id) ON DELETE CASCADE,
+    group_id INTEGER NOT NULL REFERENCES "group" (id) ON DELETE CASCADE,
     PRIMARY KEY (adlist_id, group_id)
 );
 
@@ -75,8 +75,8 @@ INSERT INTO "info" VALUES('gravity_restored','false');
 
 CREATE TABLE domainlist_by_group
 (
-    domainlist_id INTEGER NOT NULL REFERENCES domainlist (id),
-    group_id INTEGER NOT NULL REFERENCES "group" (id),
+    domainlist_id INTEGER NOT NULL REFERENCES domainlist (id) ON DELETE CASCADE,
+    group_id INTEGER NOT NULL REFERENCES "group" (id) ON DELETE CASCADE,
     PRIMARY KEY (domainlist_id, group_id)
 );
 
@@ -91,8 +91,8 @@ CREATE TABLE client
 
 CREATE TABLE client_by_group
 (
-    client_id INTEGER NOT NULL REFERENCES client (id),
-    group_id INTEGER NOT NULL REFERENCES "group" (id),
+    client_id INTEGER NOT NULL REFERENCES client (id) ON DELETE CASCADE,
+    group_id INTEGER NOT NULL REFERENCES "group" (id) ON DELETE CASCADE,
     PRIMARY KEY (client_id, group_id)
 );
 
diff --git a/advanced/Templates/pihole-FTL-poststop.sh b/advanced/Templates/pihole-FTL-poststop.sh
index b5ddbc97..504e2382 100755
--- a/advanced/Templates/pihole-FTL-poststop.sh
+++ b/advanced/Templates/pihole-FTL-poststop.sh
@@ -3,7 +3,7 @@
 # Source utils.sh for getFTLConfigValue()
 PI_HOLE_SCRIPT_DIR='/opt/pihole'
 utilsfile="${PI_HOLE_SCRIPT_DIR}/utils.sh"
-# shellcheck disable=SC1090
+# shellcheck source="./advanced/Scripts/utils.sh"
 . "${utilsfile}"
 
 # Get file paths
diff --git a/advanced/Templates/pihole-FTL-prestart.sh b/advanced/Templates/pihole-FTL-prestart.sh
index 37d750a2..579309d3 100755
--- a/advanced/Templates/pihole-FTL-prestart.sh
+++ b/advanced/Templates/pihole-FTL-prestart.sh
@@ -3,7 +3,7 @@
 # Source utils.sh for getFTLConfigValue()
 PI_HOLE_SCRIPT_DIR='/opt/pihole'
 utilsfile="${PI_HOLE_SCRIPT_DIR}/utils.sh"
-# shellcheck disable=SC1090
+# shellcheck source="./advanced/Scripts/utils.sh"
 . "${utilsfile}"
 
 # Get file paths
@@ -12,6 +12,10 @@ FTL_PID_FILE="$(getFTLConfigValue files.pid)"
 # Ensure that permissions are set so that pihole-FTL can edit all necessary files
 mkdir -p /var/log/pihole
 chown -R pihole:pihole /etc/pihole/ /var/log/pihole/
+
+# allow all users read version file (and use pihole -v)
+chmod 0644 /etc/pihole/versions
+
 # allow pihole to access subdirs in /etc/pihole (sets execution bit on dirs)
 find /etc/pihole/ /var/log/pihole/ -type d -exec chmod 0755 {} +
 # Set all files (except TLS-related ones) to u+rw g+r
diff --git a/advanced/Templates/pihole-FTL.service b/advanced/Templates/pihole-FTL.service
index 151d4f90..7c7e9962 100644
--- a/advanced/Templates/pihole-FTL.service
+++ b/advanced/Templates/pihole-FTL.service
@@ -12,7 +12,7 @@
 # Source utils.sh for getFTLConfigValue(), getFTLPID()
 PI_HOLE_SCRIPT_DIR="/opt/pihole"
 utilsfile="${PI_HOLE_SCRIPT_DIR}/utils.sh"
-# shellcheck disable=SC1090
+# shellcheck source="./advanced/Scripts/utils.sh"
 . "${utilsfile}"
 
 
@@ -57,13 +57,16 @@ start() {
 stop() {
   if is_running; then
     kill "${FTL_PID}"
-    for i in 1 2 3 4 5; do
+    # Give FTL 60 seconds to gracefully stop
+    i=1
+    while [ "${i}" -le 60 ]; do
       if ! is_running; then
         break
       fi
 
       printf "."
       sleep 1
+      i=$((i + 1))
     done
     echo
 
diff --git a/advanced/Templates/pihole-FTL.systemd b/advanced/Templates/pihole-FTL.systemd
index 0a3d270e..fcbb8d8d 100644
--- a/advanced/Templates/pihole-FTL.systemd
+++ b/advanced/Templates/pihole-FTL.systemd
@@ -28,7 +28,7 @@ ExecReload=/bin/kill -HUP $MAINPID
 ExecStopPost=/opt/pihole/pihole-FTL-poststop.sh
 
 # Use graceful shutdown with a reasonable timeout
-TimeoutStopSec=10s
+TimeoutStopSec=60s
 
 # Make /usr, /boot, /etc and possibly some more folders read-only...
 ProtectSystem=full
diff --git a/automated install/basic-install.sh b/automated install/basic-install.sh
index e69256ff..6cc69008 100755
--- a/automated install/basic-install.sh	
+++ b/automated install/basic-install.sh	
@@ -1,5 +1,4 @@
 #!/usr/bin/env bash
-# shellcheck disable=SC1090
 
 # Pi-hole: A black hole for Internet advertisements
 # (c) Pi-hole (https://pi-hole.net)
@@ -49,7 +48,6 @@ Google (ECS, DNSSEC);8.8.8.8;8.8.4.4;2001:4860:4860:0:0:0:0:8888;2001:4860:4860:
 OpenDNS (ECS, DNSSEC);208.67.222.222;208.67.220.220;2620:119:35::35;2620:119:53::53
 Level3;4.2.2.1;4.2.2.2;;
 Comodo;8.26.56.26;8.20.247.20;;
-DNS.WATCH (DNSSEC);84.200.69.80;84.200.70.40;2001:1608:10:25:0:0:1c04:b12f;2001:1608:10:25:0:0:9249:d69b
 Quad9 (filtered, DNSSEC);9.9.9.9;149.112.112.112;2620:fe::fe;2620:fe::9
 Quad9 (unfiltered, no DNSSEC);9.9.9.10;149.112.112.10;2620:fe::10;2620:fe::fe:10
 Quad9 (filtered, ECS, DNSSEC);9.9.9.11;149.112.112.11;2620:fe::11;2620:fe::fe:11
@@ -57,6 +55,17 @@ Cloudflare (DNSSEC);1.1.1.1;1.0.0.1;2606:4700:4700::1111;2606:4700:4700::1001
 EOM
 )
 
+DNS_SERVERS_IPV6_ONLY=$(
+    cat <<EOM
+Google (ECS, DNSSEC);2001:4860:4860:0:0:0:0:8888;2001:4860:4860:0:0:0:0:8844
+OpenDNS (ECS, DNSSEC);2620:119:35::35;2620:119:53::53
+Quad9 (filtered, DNSSEC);2620:fe::fe;2620:fe::9
+Quad9 (unfiltered, no DNSSEC);2620:fe::10;2620:fe::fe:10
+Quad9 (filtered, ECS, DNSSEC);2620:fe::11;2620:fe::fe:11
+Cloudflare (DNSSEC);2606:4700:4700::1111;2606:4700:4700::1001
+EOM
+)
+
 # Location for final installation log storage
 installLogLoc="/etc/pihole/install.log"
 # This is a file used for the colorized output
@@ -90,6 +99,7 @@ IPV6_ADDRESS=${IPV6_ADDRESS}
 # Give settings their default values. These may be changed by prompts later in the script.
 QUERY_LOGGING=
 PRIVACY_LEVEL=
+PIHOLE_INTERFACE=
 
 # Where old configs go to if a v6 migration is performed
 V6_CONF_MIGRATION_DIR="/etc/pihole/migration_backup_v6"
@@ -106,11 +116,13 @@ c=70
 PIHOLE_META_PACKAGE_CONTROL_APT=$(
     cat <<EOM
 Package: pihole-meta
-Version: 0.1
+Version: 0.4
 Maintainer: Pi-hole team <adblock@pi-hole.net>
 Architecture: all
 Description: Pi-hole dependency meta package
-Depends: grep,dnsutils,binutils,git,iproute2,dialog,ca-certificates,cron,curl,iputils-ping,psmisc,sudo,unzip,libcap2-bin,dns-root-data,libcap2,netcat-openbsd,procps,jq,lshw,bash-completion
+Depends: awk,bash-completion,binutils,ca-certificates,cron|cron-daemon,curl,dialog,dnsutils,dns-root-data,git,grep,iproute2,iputils-ping,jq,libcap2,libcap2-bin,lshw,netcat-openbsd,procps,psmisc,sudo,unzip
+Section: contrib/metapackages
+Priority: optional
 EOM
 )
 
@@ -118,12 +130,12 @@ EOM
 PIHOLE_META_PACKAGE_CONTROL_RPM=$(
     cat <<EOM
 Name: pihole-meta
-Version: 0.1
+Version: 0.2
 Release: 1
 License: EUPL
 BuildArch: noarch
 Summary: Pi-hole dependency meta package
-Requires: grep,curl,psmisc,sudo, unzip,jq,git,dialog,ca-certificates, bind-utils, iproute, procps-ng, chkconfig, binutils, cronie, findutils, libcap, nmap-ncat, lshw, bash-completion
+Requires: bash-completion,bind-utils,binutils,ca-certificates,chkconfig,cronie,curl,dialog,findutils,gawk,git,grep,iproute,jq,libcap,lshw,nmap-ncat,procps-ng,psmisc,sudo,unzip
 %description
 Pi-hole dependency meta package
 %prep
@@ -131,6 +143,9 @@ Pi-hole dependency meta package
 %files
 %install
 %changelog
+* Wed May 28 2025 Pi-hole Team - 0.2
+- Add gawk to the list of dependencies
+
 * Sun Sep 29 2024 Pi-hole Team - 0.1
 - First version being packaged
 EOM
@@ -152,6 +167,7 @@ done
 # If the color table file exists,
 if [[ -f "${coltable}" ]]; then
     # source it
+    # shellcheck source="./advanced/Scripts/COL_TABLE"
     source "${coltable}"
 # Otherwise,
 else
@@ -215,174 +231,13 @@ is_command() {
     command -v "${check_command}" >/dev/null 2>&1
 }
 
-os_check_dig(){
-    local protocol="$1"
-    local domain="$2"
-    local nameserver="$3"
-    local response
+is_pid1() {
+    # Checks to see if the given command runs as PID 1
+    local is_pid1="$1"
 
-    response="$(dig -"${protocol}" +short -t txt "${domain}" "${nameserver}" 2>&1
-    echo $?
-    )"
-    echo "${response}"
-}
-
-os_check_dig_response(){
-    # Checks the reply from the dig command to determine if it's a valid response
-    local digReply="$1"
-    local response
-
-    # Dig returned 0 (success), so get the actual response, and loop through it to determine if the detected variables above are valid
-    response="${digReply%%$'\n'*}"
-    # If the value of ${response} is a single 0, then this is the return code, not an actual response.
-    if [ "${response}" == 0 ]; then
-        echo false
-    else
-        echo true
-    fi
-}
-
-os_check() {
-    if [ "$PIHOLE_SKIP_OS_CHECK" != true ]; then
-        # This function gets a list of supported OS versions from a TXT record at versions.pi-hole.net
-        # and determines whether or not the script is running on one of those systems
-        local remote_os_domain valid_os valid_version valid_response detected_os detected_version display_warning cmdResult digReturnCode response
-        local piholeNameserver="@ns1.pi-hole.net"
-        remote_os_domain=${OS_CHECK_DOMAIN_NAME:-"versions.pi-hole.net"}
-
-        detected_os=$(grep '^ID=' /etc/os-release | cut -d '=' -f2 | tr -d '"')
-        detected_version=$(grep VERSION_ID /etc/os-release | cut -d '=' -f2 | tr -d '"')
-
-        # Test via IPv4 and hardcoded nameserver ns1.pi-hole.net
-        cmdResult=$(os_check_dig 4 "${remote_os_domain}" "${piholeNameserver}")
-
-        # Gets the return code of the previous command (last line)
-        digReturnCode="${cmdResult##*$'\n'}"
-
-        if [ ! "${digReturnCode}" == "0" ]; then
-            valid_response=false
-        else
-            valid_response=$(os_check_dig_response cmdResult)
-        fi
-
-        # Try again via IPv6 and hardcoded nameserver ns1.pi-hole.net
-        if [ "$valid_response" = false ]; then
-            unset valid_response
-            unset cmdResult
-            unset digReturnCode
-
-            cmdResult=$(os_check_dig 6 "${remote_os_domain}" "${piholeNameserver}")
-            # Gets the return code of the previous command (last line)
-            digReturnCode="${cmdResult##*$'\n'}"
-
-            if [ ! "${digReturnCode}" == "0" ]; then
-                valid_response=false
-            else
-                valid_response=$(os_check_dig_response cmdResult)
-            fi
-        fi
-
-        # Try again without hardcoded nameserver
-        if [ "$valid_response" = false ]; then
-            unset valid_response
-            unset cmdResult
-            unset digReturnCode
-
-            cmdResult=$(os_check_dig 4 "${remote_os_domain}")
-            # Gets the return code of the previous command (last line)
-            digReturnCode="${cmdResult##*$'\n'}"
-
-            if [ ! "${digReturnCode}" == "0" ]; then
-                valid_response=false
-            else
-                valid_response=$(os_check_dig_response cmdResult)
-            fi
-        fi
-
-        if [ "$valid_response" = false ]; then
-            unset valid_response
-            unset cmdResult
-            unset digReturnCode
-
-            cmdResult=$(os_check_dig 6 "${remote_os_domain}")
-            # Gets the return code of the previous command (last line)
-            digReturnCode="${cmdResult##*$'\n'}"
-
-            if [ ! "${digReturnCode}" == "0" ]; then
-                valid_response=false
-            else
-                valid_response=$(os_check_dig_response cmdResult)
-            fi
-        fi
-
-        if [ "$valid_response" = true ]; then
-            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 the distro part is a (case-insensitive) substring of the computer OS
-                if [[ "${detected_os^^}" =~ ${distro_part^^} ]]; then
-                    valid_os=true
-                    IFS="," read -r -a supportedVer <<<"${versions_part}"
-                    for version in "${supportedVer[@]}"; do
-                        if [[ "${detected_version}" =~ $version ]]; then
-                            valid_version=true
-                            break
-                        fi
-                    done
-                    break
-                fi
-            done
-        fi
-
-        if [ "$valid_os" = true ] && [ "$valid_version" = true ] && [ "$valid_response" = true ]; then
-            display_warning=false
-        fi
-
-        if [ "$display_warning" != false ]; then
-            if [ "$valid_response" = false ]; then
-
-                if [ "${digReturnCode}" -eq 0 ]; then
-                    errStr="dig succeeded, but response was blank. Please contact support"
-                else
-                    errStr="dig failed with return code ${digReturnCode}"
-                fi
-                printf "  %b %bRetrieval of supported OS list failed. %s. %b\\n" "${CROSS}" "${COL_LIGHT_RED}" "${errStr}" "${COL_NC}"
-                printf "      %bUnable to determine if the detected OS (%s %s) is supported%b\\n" "${COL_LIGHT_RED}" "${detected_os^}" "${detected_version}" "${COL_NC}"
-                printf "      Possible causes for this include:\\n"
-                printf "        - Firewall blocking DNS lookups from Pi-hole device to ns1.pi-hole.net\\n"
-                printf "        - DNS resolution issues of the host system\\n"
-                printf "        - Other internet connectivity issues\\n"
-            else
-                printf "  %b %bUnsupported OS detected: %s %s%b\\n" "${CROSS}" "${COL_LIGHT_RED}" "${detected_os^}" "${detected_version}" "${COL_NC}"
-                printf "      If you are seeing this message and you do have a supported OS, please contact support.\\n"
-            fi
-            printf "\\n"
-            printf "      %bhttps://docs.pi-hole.net/main/prerequisites/#supported-operating-systems%b\\n" "${COL_LIGHT_GREEN}" "${COL_NC}"
-            printf "\\n"
-            printf "      If you wish to attempt to continue anyway, you can try one of the following commands to skip this check:\\n"
-            printf "\\n"
-            printf "      e.g: If you are seeing this message on a fresh install, you can run:\\n"
-            printf "             %bcurl -sSL https://install.pi-hole.net | sudo PIHOLE_SKIP_OS_CHECK=true bash%b\\n" "${COL_LIGHT_GREEN}" "${COL_NC}"
-            printf "\\n"
-            printf "           If you are seeing this message after having run pihole -up:\\n"
-            printf "             %bsudo PIHOLE_SKIP_OS_CHECK=true pihole -r%b\\n" "${COL_LIGHT_GREEN}" "${COL_NC}"
-            printf "           (In this case, your previous run of pihole -up will have already updated the local repository)\\n"
-            printf "\\n"
-            printf "      It is possible that the installation will still fail at this stage due to an unsupported configuration.\\n"
-            printf "      If that is the case, you can feel free to ask the community on Discourse with the %bCommunity Help%b category:\\n" "${COL_LIGHT_RED}" "${COL_NC}"
-            printf "      %bhttps://discourse.pi-hole.net/c/bugs-problems-issues/community-help/%b\\n" "${COL_LIGHT_GREEN}" "${COL_NC}"
-            printf "\\n"
-            exit 1
-
-        else
-            printf "  %b %bSupported OS detected%b\\n" "${TICK}" "${COL_LIGHT_GREEN}" "${COL_NC}"
-        fi
-    else
-        printf "  %b %bPIHOLE_SKIP_OS_CHECK env variable set to true - installer will continue%b\\n" "${INFO}" "${COL_LIGHT_GREEN}" "${COL_NC}"
-    fi
+    # select PID 1, format output to show only CMD column without header
+    # quietly grep for a match on the function passed parameter
+    ps --pid 1 --format comm= | grep -q "${is_pid1}"
 }
 
 # Compatibility
@@ -686,7 +541,11 @@ find_IPv4_information() {
     local IPv4bare
 
     # Find IP used to route to outside world by checking the route to Google's public DNS server
-    route=$(ip route get 8.8.8.8)
+    if ! route="$(ip route get 8.8.8.8 2> /dev/null)"; then
+        printf "  %b No IPv4 route was detected.\n" "${INFO}"
+        IPV4_ADDRESS=""
+        return
+    fi
 
     # Get just the interface IPv4 address
     # shellcheck disable=SC2059,SC2086
@@ -702,10 +561,32 @@ find_IPv4_information() {
     IPV4_ADDRESS=$(ip -oneline -family inet address show | grep "${IPv4bare}/" | awk '{print $4}' | awk 'END {print}')
 }
 
+confirm_ipv6_only() {
+    # Confirm from user before IPv6 only install
+
+    dialog --no-shadow --output-fd 1 \
+--no-button "Exit" --yes-button "Install IPv6 ONLY" \
+--yesno "\\n\\nWARNING - no valid IPv4 route detected.\\n\\n\
+This may be due to a temporary connectivity issue,\\n\
+or you may be installing on an IPv6 only system.\\n\\n\
+Do you wish to continue with an IPv6-only installation?\\n\\n" \
+        "${r}" "${c}" && result=0 || result="$?"
+
+    case "${result}" in
+    "${DIALOG_CANCEL}" | "${DIALOG_ESC}")
+        printf "  %b Installer exited at IPv6 only message.\\n" "${INFO}"
+        exit 1
+    ;;
+    esac
+
+    DNS_SERVERS="$DNS_SERVERS_IPV6_ONLY"
+    printf "  %b Proceeding with IPv6 only installation.\\n" "${INFO}"
+}
+
 # Get available interfaces that are UP
 get_available_interfaces() {
     # There may be more than one so it's all stored in a variable
-    availableInterfaces=$(ip --oneline link show up | grep -v "lo" | awk '{print $2}' | cut -d':' -f1 | cut -d'@' -f1)
+    availableInterfaces=$(ip --oneline link show up | awk '{print $2}' |  grep -v "^lo" | cut -d':' -f1 | cut -d'@' -f1)
 }
 
 # A function for displaying the dialogs the user sees when first running the installer
@@ -767,7 +648,6 @@ chooseInterface() {
             # All further interfaces are deselected
             status="OFF"
         done
-        # shellcheck disable=SC2086
         # Disable check for double quote here as we are passing a string with spaces
         PIHOLE_INTERFACE=$(dialog --no-shadow --keep-tite --output-fd 1 \
             --cancel-label "Exit" --ok-label "Select" \
@@ -856,6 +736,9 @@ collect_v4andv6_information() {
     printf "  %b IPv4 address: %s\\n" "${INFO}" "${IPV4_ADDRESS}"
     find_IPv6_information
     printf "  %b IPv6 address: %s\\n" "${INFO}" "${IPV6_ADDRESS}"
+    if [ "$IPV4_ADDRESS" == "" ] && [ "$IPV6_ADDRESS" != "" ]; then
+        confirm_ipv6_only
+    fi
 }
 
 # Check an IP address to see if it is a valid one
@@ -1281,8 +1164,7 @@ installConfigs() {
     fi
 
     # Install pihole-FTL systemd or init.d service, based on whether systemd is the init system or not
-    # Follow debhelper logic, which checks for /run/systemd/system to derive whether systemd is the init system
-    if [[ -d '/run/systemd/system' ]]; then
+    if is_pid1 systemd; then
         install -T -m 0644 "${PI_HOLE_LOCAL_REPO}/advanced/Templates/pihole-FTL.systemd" '/etc/systemd/system/pihole-FTL.service'
 
         # Remove init.d service if present
@@ -1350,9 +1232,12 @@ stop_service() {
     # Can softfail, as process may not be installed when this is called
     local str="Stopping ${1} service"
     printf "  %b %s..." "${INFO}" "${str}"
-    if is_command systemctl; then
+    # If systemd is PID 1,
+    if is_pid1 systemd; then
+        # use that to restart the service
         systemctl -q stop "${1}" || true
     else
+        # Otherwise, fall back to the service command
         service "${1}" stop >/dev/null || true
     fi
     printf "%b  %b %s...\\n" "${OVER}" "${TICK}" "${str}"
@@ -1363,8 +1248,8 @@ restart_service() {
     # Local, named variables
     local str="Restarting ${1} service"
     printf "  %b %s..." "${INFO}" "${str}"
-    # If systemctl exists,
-    if is_command systemctl; then
+    # If systemd is PID 1,
+    if is_pid1 systemd; then
         # use that to restart the service
         systemctl -q restart "${1}"
     else
@@ -1379,8 +1264,8 @@ enable_service() {
     # Local, named variables
     local str="Enabling ${1} service to start on reboot"
     printf "  %b %s..." "${INFO}" "${str}"
-    # If systemctl exists,
-    if is_command systemctl; then
+    # If systemd is PID1,
+    if is_pid1 systemd; then
         # use that to enable the service
         systemctl -q enable "${1}"
     else
@@ -1395,8 +1280,8 @@ disable_service() {
     # Local, named variables
     local str="Disabling ${1} service"
     printf "  %b %s..." "${INFO}" "${str}"
-    # If systemctl exists,
-    if is_command systemctl; then
+    # If systemd is PID1,
+    if is_pid1 systemd; then
         # use that to disable the service
         systemctl -q disable "${1}"
     else
@@ -1407,8 +1292,8 @@ disable_service() {
 }
 
 check_service_active() {
-    # If systemctl exists,
-    if is_command systemctl; then
+    # If systemd is PID1,
+    if is_pid1 systemd; then
         # use that to check the status of the service
         systemctl -q is-enabled "${1}" 2>/dev/null
     else
@@ -1750,7 +1635,8 @@ checkSelinux() {
 
 check_download_exists() {
     # Check if the download exists and we can reach the server
-    local status=$(curl --head --silent "https://ftl.pi-hole.net/${1}" | head -n 1)
+    local status
+    status=$(curl --head --silent "https://ftl.pi-hole.net/${1}" | head -n 1)
 
     # Check the status code
     if grep -q "200" <<<"$status"; then
@@ -1869,7 +1755,6 @@ clone_or_reset_repos() {
 
 # Download FTL binary to random temp directory and install FTL binary
 # Disable directive for SC2120 a value _can_ be passed to this function, but it is passed from an external script that sources this one
-# shellcheck disable=SC2120
 FTLinstall() {
     # Local, named variables
     local str="Downloading and Installing FTL"
@@ -2067,13 +1952,13 @@ FTLcheckUpdate() {
         path="${ftlBranch}/${binary}"
 
         # Check whether or not the binary for this FTL branch actually exists. If not, then there is no update!
-        # shellcheck disable=SC1090
         if ! check_download_exists "$path"; then
-            if [ $? -eq 1 ]; then
+            local status
+            status=$?
+            if [ "${status}" -eq 1 ]; then
                 printf "  %b Branch \"%s\" is not available.\\n" "${INFO}" "${ftlBranch}"
                 printf "  %b Use %bpihole checkout ftl [branchname]%b to switch to a valid branch.\\n" "${INFO}" "${COL_LIGHT_GREEN}" "${COL_NC}"
-                return 2
-            elif [ $? -eq 2 ]; then
+            elif [ "${status}" -eq 2 ]; then
                 printf "  %b Unable to download from ftl.pi-hole.net. Please check your Internet connection and try again later.\\n" "${CROSS}"
                 return 3
             else
@@ -2101,12 +1986,14 @@ FTLcheckUpdate() {
             # same as the remote one
             local FTLversion
             FTLversion=$(/usr/bin/pihole-FTL tag)
-            local FTLlatesttag
 
             # Get the latest version from the GitHub API
-            if ! FTLlatesttag=$(curl -sI https://github.com/pi-hole/FTL/releases/latest | grep --color=never -i Location: | awk -F / '{print $NF}' | tr -d '[:cntrl:]'); then
+            local FTLlatesttag
+            FTLlatesttag=$(curl -s https://api.github.com/repos/pi-hole/FTL/releases/latest | jq -sRr 'fromjson? | .tag_name | values')
+
+            if [ -z "${FTLlatesttag}" ]; then
                 # There was an issue while retrieving the latest version
-                printf "  %b Failed to retrieve latest FTL release metadata" "${CROSS}"
+                printf "  %b Failed to retrieve latest FTL release metadata\\n" "${CROSS}"
                 return 3
             fi
 
@@ -2124,6 +2011,7 @@ FTLcheckUpdate() {
                 # Continue further down...
             fi
         else
+            # FTL not installed, then download
             return 0
         fi
     fi
@@ -2329,8 +2217,6 @@ main() {
     # Install Pi-hole dependencies
     install_dependent_packages
 
-    # Check that the installed OS is officially supported - display warning if not
-    os_check
 
     # Check if there is a usable FTL binary available on this architecture - do
     # this early on as FTL is a hard dependency for Pi-hole
@@ -2398,7 +2284,7 @@ main() {
 
     # /opt/pihole/utils.sh should be installed by installScripts now, so we can use it
     if [ -f "${PI_HOLE_INSTALL_DIR}/utils.sh" ]; then
-        # shellcheck disable=SC1091
+        # shellcheck source="./advanced/Scripts/utils.sh"
         source "${PI_HOLE_INSTALL_DIR}/utils.sh"
     else
         printf "  %b Failure: /opt/pihole/utils.sh does not exist .\\n" "${CROSS}"
@@ -2411,16 +2297,28 @@ main() {
     # Migrate existing install to v6.0
     migrate_dnsmasq_configs
 
+    # Cleanup old v5 sudoers file if it exists
+    sudoers_file="/etc/sudoers.d/pihole"
+    if [[ -f "${sudoers_file}" ]]; then
+        # only remove the file if it contains the Pi-hole header
+        if grep -q "Pi-hole: A black hole for Internet advertisements" "${sudoers_file}"; then
+            rm -f "${sudoers_file}"
+        fi
+    fi
+
     # Check for and disable systemd-resolved-DNSStubListener before reloading resolved
     # DNSStubListener needs to remain in place for installer to download needed files,
     # so this change needs to be made after installation is complete,
     # but before starting or resttarting the ftl service
     disable_resolved_stublistener
 
-    # Check if gravity database needs to be upgraded. If so, do it without rebuilding
-    # gravity altogether. This may be a very long running task needlessly blocking
-    # the update process.
-    /opt/pihole/gravity.sh --upgrade
+    if [[ "${fresh_install}" == false ]]; then
+        # Check if gravity database needs to be upgraded. If so, do it without rebuilding
+        # gravity altogether. This may be a very long running task needlessly blocking
+        # the update process.
+        # Only do this on updates, not on fresh installs as the database does not exit yet
+        /opt/pihole/gravity.sh --upgrade
+    fi
 
     printf "  %b Restarting services...\\n" "${INFO}"
     # Start services
@@ -2452,6 +2350,10 @@ main() {
         if [ -n "${PRIVACY_LEVEL}" ]; then
             setFTLConfigValue "misc.privacylevel" "${PRIVACY_LEVEL}"
         fi
+
+        if [ -n "${PIHOLE_INTERFACE}" ]; then
+            setFTLConfigValue "dns.interface" "${PIHOLE_INTERFACE}"
+        fi
     fi
 
     # Download and compile the aggregated block list
diff --git a/automated install/uninstall.sh b/automated install/uninstall.sh
index 39c13037..eb1e9e29 100755
--- a/automated install/uninstall.sh	
+++ b/automated install/uninstall.sh	
@@ -8,7 +8,18 @@
 # This file is copyright under the latest version of the EUPL.
 # Please see LICENSE file for your rights under this license.
 
+# shellcheck source="./advanced/Scripts/COL_TABLE"
 source "/opt/pihole/COL_TABLE"
+# shellcheck source="./advanced/Scripts/utils.sh"
+source "/opt/pihole/utils.sh"
+
+SKIP_INSTALL="true"
+# shellcheck source="./automated install/basic-install.sh"
+source "${PI_HOLE_FILES_DIR}/automated install/basic-install.sh"
+# stop_service() is defined in basic-install.sh
+
+ADMIN_INTERFACE_DIR=$(getFTLConfigValue "webserver.paths.webroot")$(getFTLConfigValue "webserver.paths.webhome")
+readonly ADMIN_INTERFACE_DIR
 
 while true; do
     read -rp "  ${QST} Are you sure you would like to remove ${COL_WHITE}Pi-hole${COL_NC}? [y/N] " answer
@@ -37,6 +48,7 @@ fi
 
 readonly PI_HOLE_FILES_DIR="/etc/.pihole"
 SKIP_INSTALL="true"
+# shellcheck source="./automated install/basic-install.sh"
 source "${PI_HOLE_FILES_DIR}/automated install/basic-install.sh"
 
 # package_manager_detect() sourced from basic-install.sh
@@ -53,17 +65,9 @@ removeMetaPackage() {
 }
 
 removePiholeFiles() {
-    # Only web directories/files that are created by Pi-hole should be removed
+    # Remove the web interface of Pi-hole
     echo -ne "  ${INFO} Removing Web Interface..."
-    ${SUDO} rm -rf /var/www/html/admin &> /dev/null
-
-
-    # If the web directory is empty after removing these files, then the parent html directory can be removed.
-    if [ -d "/var/www/html" ]; then
-        if [[ ! "$(ls -A /var/www/html)" ]]; then
-            ${SUDO} rm -rf /var/www/html &> /dev/null
-        fi
-    fi
+    ${SUDO} rm -rf "${ADMIN_INTERFACE_DIR}" &> /dev/null
     echo -e "${OVER}  ${TICK} Removed Web Interface"
 
     # Attempt to preserve backwards compatibility with older versions
@@ -103,11 +107,7 @@ removePiholeFiles() {
     # Remove FTL
     if command -v pihole-FTL &> /dev/null; then
         echo -ne "  ${INFO} Removing pihole-FTL..."
-        if [[ -x "$(command -v systemctl)" ]]; then
-            systemctl stop pihole-FTL
-        else
-            service pihole-FTL stop
-        fi
+        stop_service pihole-FTL
         ${SUDO} rm -f /etc/systemd/system/pihole-FTL.service
         if [[ -d '/etc/systemd/system/pihole-FTL.service.d' ]]; then
             read -rp "  ${QST} FTL service override directory /etc/systemd/system/pihole-FTL.service.d detected. Do you wish to remove this from your system? [y/N] " answer
diff --git a/gravity.sh b/gravity.sh
index 493f2b15..16e459c6 100755
--- a/gravity.sh
+++ b/gravity.sh
@@ -1,5 +1,4 @@
 #!/usr/bin/env bash
-# shellcheck disable=SC1090
 
 # Pi-hole: A black hole for Internet advertisements
 # (c) 2017 Pi-hole, LLC (https://pi-hole.net)
@@ -16,13 +15,13 @@ export LC_ALL=C
 PI_HOLE_SCRIPT_DIR="/opt/pihole"
 # Source utils.sh for GetFTLConfigValue
 utilsfile="${PI_HOLE_SCRIPT_DIR}/utils.sh"
-# shellcheck disable=SC1090
+# shellcheck source=./advanced/Scripts/utils.sh
 . "${utilsfile}"
 
 coltable="${PI_HOLE_SCRIPT_DIR}/COL_TABLE"
-# shellcheck disable=SC1090
+# shellcheck source=./advanced/Scripts/COL_TABLE
 . "${coltable}"
-# shellcheck disable=SC1091
+# shellcheck source=./advanced/Scripts/database_migration/gravity-db.sh
 . "/etc/.pihole/advanced/Scripts/database_migration/gravity-db.sh"
 
 basename="pihole"
@@ -58,7 +57,7 @@ fi
 # Set this only after sourcing pihole-FTL.conf as the gravity database path may
 # have changed
 gravityDBfile="${GRAVITYDB}"
-gravityDBfile_default="/etc/pihole/gravity.db"
+gravityDBfile_default="${piholeDir}/gravity.db"
 gravityTEMPfile="${GRAVITYDB}_temp"
 gravityDIR="$(dirname -- "${gravityDBfile}")"
 gravityOLDfile="${gravityDIR}/gravity_old.db"
@@ -127,7 +126,7 @@ gravity_swap_databases() {
   oldAvail=false
   if [ "${availableBlocks}" -gt "$((gravityBlocks * 2))" ] && [ -f "${gravityDBfile}" ]; then
     oldAvail=true
-    cp "${gravityDBfile}" "${gravityOLDfile}"
+    cp -p "${gravityDBfile}" "${gravityOLDfile}"
   fi
 
   # Drop the gravity and antigravity tables + subsequent VACUUM the current
@@ -140,7 +139,7 @@ gravity_swap_databases() {
   else
     # Check if the backup directory exists
     if [ ! -d "${gravityBCKdir}" ]; then
-      mkdir -p "${gravityBCKdir}"
+      mkdir -p "${gravityBCKdir}" && chown pihole:pihole "${gravityBCKdir}"
     fi
 
     # If multiple gravityBCKfile's are present (appended with a number), rotate them
@@ -306,7 +305,7 @@ migrate_to_database() {
     fi
 
     # Check if gravity database needs to be updated
-    upgrade_gravityDB "${gravityDBfile}" "${piholeDir}"
+    upgrade_gravityDB "${gravityDBfile}"
 
     # Migrate list files to new database
     if [ -e "${adListFile}" ]; then
@@ -334,7 +333,7 @@ migrate_to_database() {
   fi
 
   # Check if gravity database needs to be updated
-  upgrade_gravityDB "${gravityDBfile}" "${piholeDir}"
+  upgrade_gravityDB "${gravityDBfile}"
 }
 
 # Determine if DNS resolution is available before proceeding
@@ -349,17 +348,24 @@ gravity_CheckDNSResolutionAvailable() {
     echo -e "  ${CROSS} DNS resolution is currently unavailable"
   fi
 
-  str="Waiting until DNS resolution is available..."
+  str="Waiting up to 120 seconds for DNS resolution..."
   echo -ne "  ${INFO} ${str}"
-  until getent hosts github.com &> /dev/null; do
-  # Append one dot for each second waiting
-    str="${str}."
-    echo -ne "  ${OVER}  ${INFO} ${str}"
-    sleep 1
+
+ # Default DNS timeout is two seconds, plus 1 second for each dot > 120 seconds
+  for ((i = 0; i < 40; i++)); do
+      if getent hosts github.com &> /dev/null; then
+        # If we reach this point, DNS resolution is available
+        echo -e "${OVER}  ${TICK} DNS resolution is available"
+        return 0
+      fi
+      # Append one dot for each second waiting
+      echo -ne "."
+      sleep 1
   done
 
-  # If we reach this point, DNS resolution is available
-  echo -e "${OVER}  ${TICK} DNS resolution is available"
+  # DNS resolution is still unavailable after 120 seconds
+  return 1
+
 }
 
 # Function: try_restore_backup
@@ -418,7 +424,7 @@ gravity_DownloadBlocklists() {
     echo -e "  ${INFO} Storing gravity database in ${COL_BOLD}${gravityDBfile}${COL_NC}"
   fi
 
-  local url domain str target compression adlist_type directory success
+  local url domain str compression adlist_type directory success
   echo ""
 
   # Prepare new gravity database
@@ -567,12 +573,12 @@ gravity_DownloadBlocklists() {
     if [[ "${check_url}" =~ ${regex} ]]; then
       echo -e "  ${CROSS} Invalid Target"
     else
-      timeit gravity_DownloadBlocklistFromUrl "${url}" "${sourceIDs[$i]}" "${saveLocation}" "${target}" "${compression}" "${adlist_type}" "${domain}"
+      timeit gravity_DownloadBlocklistFromUrl "${url}" "${sourceIDs[$i]}" "${saveLocation}" "${compression}" "${adlist_type}" "${domain}"
     fi
     echo ""
   done
 
-  gravity_Blackbody=true
+  DownloadBlocklists_done=true
 }
 
 compareLists() {
@@ -601,7 +607,7 @@ compareLists() {
 
 # Download specified URL and perform checks on HTTP status and file content
 gravity_DownloadBlocklistFromUrl() {
-  local url="${1}" adlistID="${2}" saveLocation="${3}" target="${4}" compression="${5}" gravity_type="${6}" domain="${7}"
+  local url="${1}" adlistID="${2}" saveLocation="${3}" compression="${4}" gravity_type="${5}" domain="${6}"
   local modifiedOptions="" listCurlBuffer str httpCode success="" ip cmd_ext
   local file_path permissions ip_addr port blocked=false download=true
 
@@ -647,32 +653,6 @@ gravity_DownloadBlocklistFromUrl() {
   str="Status:"
   echo -ne "  ${INFO} ${str} Pending..."
   blocked=false
-  case $(getFTLConfigValue dns.blocking.mode) in
-  "IP-NODATA-AAAA" | "IP")
-    # Get IP address of this domain
-    ip="$(dig "${domain}" +short)"
-    # Check if this IP matches any IP of the system
-    if [[ -n "${ip}" && $(grep -Ec "inet(|6) ${ip}" <<<"$(ip a)") -gt 0 ]]; then
-      blocked=true
-    fi
-    ;;
-  "NXDOMAIN")
-    if [[ $(dig "${domain}" | grep "NXDOMAIN" -c) -ge 1 ]]; then
-      blocked=true
-    fi
-    ;;
-  "NODATA")
-    if [[ $(dig "${domain}" | grep "NOERROR" -c) -ge 1 ]] && [[ -z $(dig +short "${domain}") ]]; then
-      blocked=true
-    fi
-    ;;
-  "NULL" | *)
-    if [[ $(dig "${domain}" +short | grep "0.0.0.0" -c) -ge 1 ]]; then
-      blocked=true
-    fi
-    ;;
-  esac
-
   # Check if this domain is blocked by Pi-hole but only if the domain is not a
   # local file or empty
   if [[ $url != "file"* ]] && [[ -n "${domain}" ]]; then
@@ -770,6 +750,7 @@ gravity_DownloadBlocklistFromUrl() {
   fi
 
   if [[ "${download}" == true ]]; then
+    # See https://github.com/pi-hole/pi-hole/issues/6159 for justification of the below disable directive
     # shellcheck disable=SC2086
     httpCode=$(curl --connect-timeout ${curl_connect_timeout} -s -L ${compression} ${cmd_ext} ${modifiedOptions} -w "%{http_code}" "${url}" -o "${listCurlBuffer}" 2>/dev/null)
   fi
@@ -821,11 +802,11 @@ gravity_DownloadBlocklistFromUrl() {
       done="true"
     # Check if $listCurlBuffer is a non-zero length file
     elif [[ -s "${listCurlBuffer}" ]]; then
-      # Determine if blocklist is non-standard and parse as appropriate
-      gravity_ParseFileIntoDomains "${listCurlBuffer}" "${saveLocation}"
-      # Remove curl buffer file after its use
-      rm "${listCurlBuffer}"
-      # Compare lists if are they identical
+      # Move the downloaded list to the final location
+      mv "${listCurlBuffer}" "${saveLocation}"
+      # Ensure the file has the correct permissions
+      fix_owner_permissions "${saveLocation}"
+      # Compare lists if they are identical
       compareLists "${adlistID}" "${saveLocation}"
       # Add domains to database table file
       pihole-FTL "${gravity_type}" parseList "${saveLocation}" "${gravityTEMPfile}" "${adlistID}"
@@ -854,37 +835,6 @@ gravity_DownloadBlocklistFromUrl() {
   fi
 }
 
-# Parse source files into domains format
-gravity_ParseFileIntoDomains() {
-  local src="${1}" destination="${2}"
-
-  # Remove comments and print only the domain name
-  # Most of the lists downloaded are already in hosts file format but the spacing/formatting is not contiguous
-  # This helps with that and makes it easier to read
-  # It also helps with debugging so each stage of the script can be researched more in depth
-  # 1) Convert all characters to lowercase
-  tr '[:upper:]' '[:lower:]' <"${src}" >"${destination}"
-
-  # 2) Remove carriage returns
-  # 3) Remove lines starting with ! (ABP Comments)
-  # 4) Remove lines starting with [ (ABP Header)
-  # 5) Remove lines containing ABP extended CSS selectors ("##", "#$#", "#@#", "#?#") and Adguard JavaScript (#%#) preceded by a letter
-  # 6) Remove comments (text starting with "#", include possible spaces before the hash sign)
-  # 7) Remove leading tabs, spaces, etc. (Also removes leading IP addresses)
-  # 8) Remove empty lines
-
-  sed -i -r \
-    -e 's/\r$//' \
-    -e 's/\s*!.*//g' \
-    -e 's/\s*\[.*//g' \
-    -e '/[a-z]\#[$?@%]{0,3}\#/d' \
-    -e 's/\s*#.*//g' \
-    -e 's/^.*\s+//g' \
-    -e '/^$/d' "${destination}"
-
-  fix_owner_permissions "${destination}"
-}
-
 # Report number of entries in a table
 gravity_Table_Count() {
   local table="${1}"
@@ -932,13 +882,13 @@ gravity_Cleanup() {
   # invalid_domains location
   rm "${GRAVITY_TMPDIR}"/*.ph-non-domains 2>/dev/null
 
-  # Ensure this function only runs when gravity_SetDownloadOptions() has completed
-  if [[ "${gravity_Blackbody:-}" == true ]]; then
-    # Remove any unused .domains files
-    for file in "${piholeDir}"/*."${domainsExtension}"; do
-      # If list is not in active array, then remove it
+  # Ensure this function only runs when gravity_DownloadBlocklists() has completed
+  if [[ "${DownloadBlocklists_done:-}" == true ]]; then
+    # Remove any unused .domains/.etag/.sha files
+    for file in "${listsCacheDir}"/*."${domainsExtension}"; do
+      # If list is not in active array, then remove it and all associated files
       if [[ ! "${activeDomains[*]}" == *"${file}"* ]]; then
-        rm -f "${file}" 2>/dev/null ||
+        rm -f "${file}"* 2>/dev/null ||
           echo -e "  ${CROSS} Failed to remove ${file##*/}"
       fi
     done
@@ -1072,7 +1022,7 @@ migrate_to_listsCache_dir() {
   # If not, we need to migrate the old files to the new directory
   local str="Migrating the list's cache directory to new location"
   echo -ne "  ${INFO} ${str}..."
-  mkdir -p "${listsCacheDir}"
+  mkdir -p "${listsCacheDir}" && chown pihole:pihole "${listsCacheDir}"
 
   # Move the old files to the new directory
   if mv "${piholeDir}"/list.* "${listsCacheDir}/" 2>/dev/null; then
@@ -1131,13 +1081,19 @@ for var in "$@"; do
   "-t" | "--timeit") timed=true ;;
   "-r" | "--repair") repairSelector "$3" ;;
   "-u" | "--upgrade")
-    upgrade_gravityDB "${gravityDBfile}" "${piholeDir}"
+    upgrade_gravityDB "${gravityDBfile}"
     exit 0
     ;;
   "-h" | "--help") helpFunc ;;
   esac
 done
 
+# Check if DNS is available, no need to do any database manipulation if we're not able to download adlists
+if ! timeit gravity_CheckDNSResolutionAvailable; then
+  echo -e "   ${CROSS} No DNS resolution available. Please contact support."
+  exit 1
+fi
+
 # Remove OLD (backup) gravity file, if it exists
 if [[ -f "${gravityOLDfile}" ]]; then
   rm "${gravityOLDfile}"
@@ -1178,11 +1134,6 @@ if [[ "${forceDelete:-}" == true ]]; then
 fi
 
 # Gravity downloads blocklists next
-if ! timeit gravity_CheckDNSResolutionAvailable; then
-  echo -e "   ${CROSS} Can not complete gravity update, no DNS is available. Please contact support."
-  exit 1
-fi
-
 if ! gravity_DownloadBlocklists; then
   echo -e "   ${CROSS} Unable to create gravity database. Please try again later. If the problem persists, please contact support."
   exit 1
diff --git a/manpages/pihole.8 b/manpages/pihole.8
index 97a6ec68..e0c38828 100644
--- a/manpages/pihole.8
+++ b/manpages/pihole.8
@@ -23,7 +23,7 @@ pihole -r
 .br
 \fBpihole -g\fR
 .br
-\fBpihole\fR -\fBq\fR [options]
+\fBpihole\fR \fB-q\fR [options]
 .br
 \fBpihole\fR \fB-l\fR (\fBon|off|off noflush\fR)
 .br
@@ -43,7 +43,7 @@ pihole -r
 .br
 \fBpihole\fR \fBcheckout\fR repo [branch]
 .br
-\fBpihole\fR \api\fR endpoint
+\fBpihole\fR \fBapi\fR [verbose] endpoint
 .br
 \fBpihole\fR \fBhelp\fR
 .br
@@ -234,10 +234,14 @@ Available commands and options:
       branchname        Update subsystems to the specified branchname
 .br
 
-\fBapi\fR endpoint
+\fBapi\fR [verbose] endpoint
 .br
     Query the Pi-hole API at <endpoint>
 .br
+
+      verbose           Show authentication and status messages
+.br
+
 .SH "EXAMPLE"
 
 Some usage examples
@@ -323,6 +327,11 @@ Switching Pi-hole subsystem branches
     Queries FTL for the stats/summary endpoint
 .br
 
+\fBpihole api verbose stats/summary\fR
+.br
+    Same as above, but shows authentication and status messages
+.br
+
 .SH "COLOPHON"
 
 Get sucked into the latest news and community activity by entering Pi-hole's orbit. Information about Pi-hole, and the latest version of the software can be found at https://pi-hole.net.
diff --git a/pihole b/pihole
index bf662a82..1d5093c6 100755
--- a/pihole
+++ b/pihole
@@ -17,13 +17,16 @@ readonly PI_HOLE_SCRIPT_DIR="/opt/pihole"
 PI_HOLE_BIN_DIR="/usr/local/bin"
 
 readonly colfile="${PI_HOLE_SCRIPT_DIR}/COL_TABLE"
+# shellcheck source=./advanced/Scripts/COL_TABLE
 source "${colfile}"
 
 readonly utilsfile="${PI_HOLE_SCRIPT_DIR}/utils.sh"
+# shellcheck source=./advanced/Scripts/utils.sh
 source "${utilsfile}"
 
 # Source api functions
 readonly apifile="${PI_HOLE_SCRIPT_DIR}/api.sh"
+# shellcheck source=./advanced/Scripts/api.sh
 source "${apifile}"
 
 versionsfile="/etc/pihole/versions"
@@ -31,6 +34,7 @@ if [ -f "${versionsfile}" ]; then
     # Only source versionsfile if the file exits
     # fixes a warning during installation where versionsfile does not exist yet
     # but gravity calls `pihole -status` and thereby sourcing the file
+    # shellcheck source=/dev/null
     source "${versionsfile}"
 fi
 
@@ -247,12 +251,14 @@ Time:
   data=$(PostFTLData "dns/blocking" "{ \"blocking\": ${1}, \"timer\": ${tt} }")
 
   # Check the response
-  local extra=" forever"
-  local timer="$(echo "${data}"| jq --raw-output '.timer' )"
+  local extra timer
+  extra=" forever"
+  timer="$(echo "${data}"| jq --raw-output '.timer' )"
   if [[ "${timer}" != "null" ]]; then
     extra=" for ${timer}s"
   fi
-  local str="Pi-hole $(echo "${data}" | jq --raw-output '.blocking')${extra}"
+  local str
+  str="Pi-hole $(echo "${data}" | jq --raw-output '.blocking')${extra}"
 
   # Logout from the API
   LogoutAPI
@@ -375,14 +381,16 @@ statusFunc() {
 
 tailFunc() {
   # Warn user if Pi-hole's logging is disabled
-  local logging_enabled=$(getFTLConfigValue dns.queryLogging)
+  local logging_enabled
+  logging_enabled=$(getFTLConfigValue dns.queryLogging)
   if [[ "${logging_enabled}" != "true" ]]; then
     echo "  ${CROSS} Warning: Query logging is disabled"
   fi
   echo -e "  ${INFO} Press Ctrl-C to exit"
 
   # Get logfile path
-  readonly LOGFILE=$(getFTLConfigValue files.log.dnsmasq)
+  readonly LOGFILE
+  LOGFILE=$(getFTLConfigValue files.log.dnsmasq)
 
   # Strip date from each line
   # Color blocklist/denylist/wildcard entries as red
@@ -423,6 +431,7 @@ piholeCheckoutFunc() {
       exit 0
     fi
 
+    #shellcheck source=./advanced/Scripts/piholeCheckout.sh
     source "${PI_HOLE_SCRIPT_DIR}"/piholeCheckout.sh
     shift
     checkout "$@"
@@ -484,6 +493,7 @@ Debugging Options:
                       Add an optional argument to filter the log
                       (regular expressions are supported)
   api <endpoint>      Query the Pi-hole API at <endpoint>
+                        Precede <endpoint> with 'verbose' option to show authentication and status messages
 
 
 Options:
@@ -592,6 +602,6 @@ case "${1}" in
   "updatechecker"                 ) shift; updateCheckFunc "$@";;
   "arpflush"                      ) arpFunc "$@";;
   "-t" | "tail"                   ) tailFunc "$2";;
-  "api"                           ) apiFunc "$2";;
+  "api"                           ) shift; apiFunc "$@";;
   *                               ) helpFunc;;
 esac
diff --git a/test/_centos_10.Dockerfile b/test/_centos_10.Dockerfile
new file mode 100644
index 00000000..c6b2ca75
--- /dev/null
+++ b/test/_centos_10.Dockerfile
@@ -0,0 +1,19 @@
+FROM quay.io/centos/centos:stream10
+# Disable SELinux
+RUN echo "SELINUX=disabled" > /etc/selinux/config
+RUN yum install -y --allowerasing curl git
+
+ENV GITDIR=/etc/.pihole
+ENV SCRIPTDIR=/opt/pihole
+
+RUN mkdir -p $GITDIR $SCRIPTDIR /etc/pihole
+ADD . $GITDIR
+RUN cp $GITDIR/advanced/Scripts/*.sh $GITDIR/gravity.sh $GITDIR/pihole $GITDIR/automated\ install/*.sh $GITDIR/advanced/Scripts/COL_TABLE $SCRIPTDIR/
+ENV PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:$SCRIPTDIR
+
+RUN true && \
+    chmod +x $SCRIPTDIR/*
+
+ENV SKIP_INSTALL=true
+
+#sed '/# Start the installer/Q' /opt/pihole/basic-install.sh > /opt/pihole/stub_basic-install.sh && \
diff --git a/test/_centos_9.Dockerfile b/test/_centos_9.Dockerfile
index a5e7cf0b..0e12edab 100644
--- a/test/_centos_9.Dockerfile
+++ b/test/_centos_9.Dockerfile
@@ -1,7 +1,7 @@
 FROM quay.io/centos/centos:stream9
 # Disable SELinux
 RUN echo "SELINUX=disabled" > /etc/selinux/config
-RUN yum install -y --allowerasing curl git initscripts
+RUN yum install -y --allowerasing curl git
 
 ENV GITDIR=/etc/.pihole
 ENV SCRIPTDIR=/opt/pihole
@@ -15,6 +15,5 @@ RUN true && \
     chmod +x $SCRIPTDIR/*
 
 ENV SKIP_INSTALL=true
-ENV OS_CHECK_DOMAIN_NAME=dev-supportedos.pi-hole.net
 
 #sed '/# Start the installer/Q' /opt/pihole/basic-install.sh > /opt/pihole/stub_basic-install.sh && \
diff --git a/test/_debian_11.Dockerfile b/test/_debian_11.Dockerfile
index b8107244..2389063c 100644
--- a/test/_debian_11.Dockerfile
+++ b/test/_debian_11.Dockerfile
@@ -12,6 +12,5 @@ RUN true && \
     chmod +x $SCRIPTDIR/*
 
 ENV SKIP_INSTALL=true
-ENV OS_CHECK_DOMAIN_NAME=dev-supportedos.pi-hole.net
 
 #sed '/# Start the installer/Q' /opt/pihole/basic-install.sh > /opt/pihole/stub_basic-install.sh && \
diff --git a/test/_debian_12.Dockerfile b/test/_debian_12.Dockerfile
index 7446711a..a6c5f1ed 100644
--- a/test/_debian_12.Dockerfile
+++ b/test/_debian_12.Dockerfile
@@ -12,6 +12,5 @@ RUN true && \
     chmod +x $SCRIPTDIR/*
 
 ENV SKIP_INSTALL=true
-ENV OS_CHECK_DOMAIN_NAME=dev-supportedos.pi-hole.net
 
 #sed '/# Start the installer/Q' /opt/pihole/basic-install.sh > /opt/pihole/stub_basic-install.sh && \
diff --git a/test/_fedora_40.Dockerfile b/test/_fedora_40.Dockerfile
index 20102a10..56be9d84 100644
--- a/test/_fedora_40.Dockerfile
+++ b/test/_fedora_40.Dockerfile
@@ -1,5 +1,5 @@
 FROM fedora:40
-RUN dnf install -y git initscripts
+RUN dnf install -y git
 
 ENV GITDIR=/etc/.pihole
 ENV SCRIPTDIR=/opt/pihole
@@ -13,6 +13,5 @@ RUN true && \
     chmod +x $SCRIPTDIR/*
 
 ENV SKIP_INSTALL=true
-ENV OS_CHECK_DOMAIN_NAME=dev-supportedos.pi-hole.net
 
 #sed '/# Start the installer/Q' /opt/pihole/basic-install.sh > /opt/pihole/stub_basic-install.sh && \
diff --git a/test/_fedora_41.Dockerfile b/test/_fedora_41.Dockerfile
index bf5fe5d5..2a9ecf70 100644
--- a/test/_fedora_41.Dockerfile
+++ b/test/_fedora_41.Dockerfile
@@ -1,5 +1,5 @@
 FROM fedora:41
-RUN dnf install -y git initscripts
+RUN dnf install -y git
 
 ENV GITDIR=/etc/.pihole
 ENV SCRIPTDIR=/opt/pihole
@@ -13,6 +13,5 @@ RUN true && \
     chmod +x $SCRIPTDIR/*
 
 ENV SKIP_INSTALL=true
-ENV OS_CHECK_DOMAIN_NAME=dev-supportedos.pi-hole.net
 
 #sed '/# Start the installer/Q' /opt/pihole/basic-install.sh > /opt/pihole/stub_basic-install.sh && \
diff --git a/test/_fedora_42.Dockerfile b/test/_fedora_42.Dockerfile
new file mode 100644
index 00000000..0d235e2d
--- /dev/null
+++ b/test/_fedora_42.Dockerfile
@@ -0,0 +1,17 @@
+FROM fedora:42
+RUN dnf install -y git gawk
+
+ENV GITDIR=/etc/.pihole
+ENV SCRIPTDIR=/opt/pihole
+
+RUN mkdir -p $GITDIR $SCRIPTDIR /etc/pihole
+ADD . $GITDIR
+RUN cp $GITDIR/advanced/Scripts/*.sh $GITDIR/gravity.sh $GITDIR/pihole $GITDIR/automated\ install/*.sh $GITDIR/advanced/Scripts/COL_TABLE $SCRIPTDIR/
+ENV PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:$SCRIPTDIR
+
+RUN true && \
+    chmod +x $SCRIPTDIR/*
+
+ENV SKIP_INSTALL=true
+
+#sed '/# Start the installer/Q' /opt/pihole/basic-install.sh > /opt/pihole/stub_basic-install.sh && \
diff --git a/test/_ubuntu_20.Dockerfile b/test/_ubuntu_20.Dockerfile
index 75c12673..5b8deb5d 100644
--- a/test/_ubuntu_20.Dockerfile
+++ b/test/_ubuntu_20.Dockerfile
@@ -12,6 +12,5 @@ RUN true && \
     chmod +x $SCRIPTDIR/*
 
 ENV SKIP_INSTALL=true
-ENV OS_CHECK_DOMAIN_NAME=dev-supportedos.pi-hole.net
 
 #sed '/# Start the installer/Q' /opt/pihole/basic-install.sh > /opt/pihole/stub_basic-install.sh && \
diff --git a/test/_ubuntu_22.Dockerfile b/test/_ubuntu_22.Dockerfile
index 9206a46a..c3be89e1 100644
--- a/test/_ubuntu_22.Dockerfile
+++ b/test/_ubuntu_22.Dockerfile
@@ -13,6 +13,5 @@ RUN true && \
     chmod +x $SCRIPTDIR/*
 
 ENV SKIP_INSTALL=true
-ENV OS_CHECK_DOMAIN_NAME=dev-supportedos.pi-hole.net
 
 #sed '/# Start the installer/Q' /opt/pihole/basic-install.sh > /opt/pihole/stub_basic-install.sh && \
diff --git a/test/_ubuntu_24.Dockerfile b/test/_ubuntu_24.Dockerfile
index 4cab43de..cf57c2aa 100644
--- a/test/_ubuntu_24.Dockerfile
+++ b/test/_ubuntu_24.Dockerfile
@@ -13,6 +13,5 @@ RUN true && \
     chmod +x $SCRIPTDIR/*
 
 ENV SKIP_INSTALL=true
-ENV OS_CHECK_DOMAIN_NAME=dev-supportedos.pi-hole.net
 
 #sed '/# Start the installer/Q' /opt/pihole/basic-install.sh > /opt/pihole/stub_basic-install.sh && \
diff --git a/test/requirements.txt b/test/requirements.txt
index fa536e25..b273c351 100644
--- a/test/requirements.txt
+++ b/test/requirements.txt
@@ -1,6 +1,6 @@
 pyyaml == 6.0.2
 pytest == 8.3.5
 pytest-xdist == 3.6.1
-pytest-testinfra == 10.1.1
-tox == 4.25.0
+pytest-testinfra == 10.2.2
+tox == 4.26.0
 pytest-clarity == 1.0.1
diff --git a/test/test_any_automated_install.py b/test/test_any_automated_install.py
index 5fa0f065..64d8c28a 100644
--- a/test/test_any_automated_install.py
+++ b/test/test_any_automated_install.py
@@ -66,6 +66,14 @@ def test_installPihole_fresh_install_readableFiles(host):
     mock_command("dialog", {"*": ("", "0")}, host)
     # mock git pull
     mock_command_passthrough("git", {"pull": ("", "0")}, host)
+    # mock PID 1 to pretend to be systemd
+    mock_command_2(
+        "ps",
+        {
+            "--pid 1": ("systemd", "0"),
+        },
+        host,
+    )
     # mock systemctl to not start FTL
     mock_command_2(
         "systemctl",
@@ -73,6 +81,7 @@ def test_installPihole_fresh_install_readableFiles(host):
             "enable pihole-FTL": ("", "0"),
             "restart pihole-FTL": ("", "0"),
             "start pihole-FTL": ("", "0"),
+            "stop pihole-FTL": ("", "0"),
             "*": ('echo "systemctl call with $@"', "0"),
         },
         host,
@@ -131,13 +140,6 @@ def test_installPihole_fresh_install_readableFiles(host):
     check_macvendor = test_cmd.format("r", "/etc/pihole/macvendor.db", piholeuser)
     actual_rc = host.run(check_macvendor).rc
     assert exit_status_success == actual_rc
-    # check readable and executable /etc/init.d/pihole-FTL
-    check_init = test_cmd.format("x", "/etc/init.d/pihole-FTL", piholeuser)
-    actual_rc = host.run(check_init).rc
-    assert exit_status_success == actual_rc
-    check_init = test_cmd.format("r", "/etc/init.d/pihole-FTL", piholeuser)
-    actual_rc = host.run(check_init).rc
-    assert exit_status_success == actual_rc
     # check readable and executable manpages
     if maninstalled is True:
         check_man = test_cmd.format("x", "/usr/local/share/man", piholeuser)
@@ -245,6 +247,7 @@ def test_FTL_detect_no_errors(host, arch, detected_string, supported):
         {
             "-A /bin/sh": ("Tag_CPU_arch: " + arch, "0"),
             "-A /usr/bin/sh": ("Tag_CPU_arch: " + arch, "0"),
+            "-A /usr/sbin/sh": ("Tag_CPU_arch: " + arch, "0"),
         },
         host,
     )
@@ -465,50 +468,6 @@ def test_validate_ip(host):
     test_address("0.0.0.0#00001", False)
 
 
-def test_os_check_fails(host):
-    """Confirms install fails on unsupported OS"""
-    host.run(
-        """
-    source /opt/pihole/basic-install.sh
-    package_manager_detect
-    build_dependency_package
-    install_dependent_packages
-    cat <<EOT > /etc/os-release
-ID=UnsupportedOS
-VERSION_ID="2"
-EOT
-    """
-    )
-    detectOS = host.run(
-        """t
-    source /opt/pihole/basic-install.sh
-    os_check
-    """
-    )
-    expected_stdout = "Unsupported OS detected: UnsupportedOS"
-    assert expected_stdout in detectOS.stdout
-
-
-def test_os_check_passes(host):
-    """Confirms OS meets the requirements"""
-    host.run(
-        """
-    source /opt/pihole/basic-install.sh
-    package_manager_detect
-    build_dependency_package
-    install_dependent_packages
-    """
-    )
-    detectOS = host.run(
-        """
-    source /opt/pihole/basic-install.sh
-    os_check
-    """
-    )
-    expected_stdout = "Supported OS detected"
-    assert expected_stdout in detectOS.stdout
-
-
 def test_package_manager_has_pihole_deps(host):
     """Confirms OS is able to install the required packages for Pi-hole"""
     mock_command("dialog", {"*": ("", "0")}, host)
diff --git a/test/tox.centos_10.ini b/test/tox.centos_10.ini
new file mode 100644
index 00000000..1a15c766
--- /dev/null
+++ b/test/tox.centos_10.ini
@@ -0,0 +1,10 @@
+[tox]
+envlist = py3
+
+[testenv:py3]
+allowlist_externals = docker
+deps = -rrequirements.txt
+setenv =
+    COLUMNS=120
+commands = docker buildx build --load --progress plain -f _centos_10.Dockerfile -t pytest_pihole:test_container ../
+           pytest {posargs:-vv -n auto} ./test_any_automated_install.py ./test_any_utils.py ./test_centos_fedora_common_support.py
diff --git a/test/tox.fedora_42.ini b/test/tox.fedora_42.ini
new file mode 100644
index 00000000..67eb77e4
--- /dev/null
+++ b/test/tox.fedora_42.ini
@@ -0,0 +1,10 @@
+[tox]
+envlist = py3
+
+[testenv]
+allowlist_externals = docker
+deps = -rrequirements.txt
+setenv =
+    COLUMNS=120
+commands = docker buildx build --load --progress plain -f _fedora_42.Dockerfile -t pytest_pihole:test_container ../
+           pytest {posargs:-vv -n auto} ./test_any_automated_install.py ./test_any_utils.py ./test_centos_fedora_common_support.py