initial commit for script overhauls

_modules/ipv6_controller.sh

@@ -0,0 +1,108 @@
+#!/usr/bin/env bash
+# _modules/ipv6_controller.sh
+
+# 1) Check if the host supports IPv6
+get_ipv6_support() {
+  if grep -qs '^1' /proc/sys/net/ipv6/conf/all/disable_ipv6 2>/dev/null \
+    || ! ip -6 route show default &>/dev/null; then
+    ENABLE_IPV6_LINE="ENABLE_IPV6=false"
+    echo "IPv6 not detected on host – disabling IPv6 support."
+  else
+    ENABLE_IPV6_LINE="ENABLE_IPV6=true"
+    echo "IPv6 detected on host – leaving IPv6 support enabled."
+  fi
+}
+
+# 2) Ensure Docker daemon.json has the required IPv6 settings
+docker_daemon_edit(){
+  DOCKER_DAEMON_CONFIG="/etc/docker/daemon.json"
+  MISSING=()
+
+  # helper: check for a key/value in the JSON
+  _has_kv() { grep -Eq "\"$1\"\s*:\s*$2" "$DOCKER_DAEMON_CONFIG" 2>/dev/null; }
+
+  if [[ -f "$DOCKER_DAEMON_CONFIG" ]]; then
+    # Validate JSON syntax if jq is available
+    if command -v jq &>/dev/null; then
+      if ! jq empty "$DOCKER_DAEMON_CONFIG" &>/dev/null; then
+        echo "ERROR: Invalid JSON in $DOCKER_DAEMON_CONFIG – please correct it manually."
+        exit 1
+      fi
+    else
+      echo "WARNING: jq not found – JSON syntax not validated."
+    fi
+
+    # Check required settings
+    ! _has_kv ipv6 true       && MISSING+=("ipv6: true")
+    ! grep -Eq '"fixed-cidr-v6"\s*:\s*".+"' "$DOCKER_DAEMON_CONFIG" \
+                              && MISSING+=('fixed-cidr-v6: "fd00:dead:beef:c0::/80"')
+
+    # Determine Docker major version
+    DOCKER_MAJOR=$(docker version --format '{{.Server.Version}}' 2>/dev/null | cut -d. -f1)
+    if [[ -n "$DOCKER_MAJOR" && "$DOCKER_MAJOR" -lt 27 ]]; then
+      _has_kv ipv6 true && ! _has_kv ip6tables true \
+                              && MISSING+=("ip6tables: true")
+      ! _has_kv experimental true \
+                              && MISSING+=("experimental: true")
+    else
+      echo "Docker ≥27 detected – skipping ip6tables/experimental checks."
+    fi
+
+    # If anything is missing, offer to auto-fix
+    if ((${#MISSING[@]}>0)); then
+      echo "Your daemon.json is missing: ${MISSING[*]}"
+      read -p "Would you like to update $DOCKER_DAEMON_CONFIG now? [Y/n] " ans
+      ans=${ans:-Y}
+      if [[ $ans =~ ^[Yy]$ ]]; then
+        cp "$DOCKER_DAEMON_CONFIG" "${DOCKER_DAEMON_CONFIG}.bak"
+        if command -v jq &>/dev/null; then
+          TMP=$(mktemp)
+          JQ_FILTER='.ipv6 = true | .["fixed-cidr-v6"] = "fd00:dead:beef:c0::/80"'
+          [[ "$DOCKER_MAJOR" && "$DOCKER_MAJOR" -lt 27 ]] \
+            && JQ_FILTER+=' | .ip6tables = true | .experimental = true'
+          jq "$JQ_FILTER" "$DOCKER_DAEMON_CONFIG" >"$TMP" && mv "$TMP" "$DOCKER_DAEMON_CONFIG"
+          echo "daemon.json updated. Restarting Docker..."
+          (command -v systemctl &>/dev/null && systemctl restart docker) \
+            || service docker restart
+          echo "Docker restarted. Please rerun this script."
+          exit 1
+        else
+          echo "Please install jq or manually update daemon.json and restart Docker."
+          exit 1
+        fi
+      else
+        ENABLE_IPV6_LINE="ENABLE_IPV6=false"
+        echo "User declined update – disabling IPv6 support."
+      fi
+    fi
+  else
+    echo "WARNING: $DOCKER_DAEMON_CONFIG not found – skipping Docker config check."
+  fi
+}
+
+# 3) Wrapper to integrate into both generate_config.sh and update.sh
+configure_ipv6() {
+  get_ipv6_support
+
+  # Only edit Docker config if IPv6 is enabled on host
+  if [[ "$ENABLE_IPV6_LINE" == "ENABLE_IPV6=true" ]]; then
+    docker_daemon_edit
+  else
+    echo "Skipping Docker IPv6 configuration because host does not support IPv6."
+  fi
+
+  # Write ENABLE_IPV6 into mailcow.conf (generate_config.sh) or export in current shell (update.sh)
+  if [[ -n "$MAILCOW_CONF" && -f "$MAILCOW_CONF" ]]; then
+    # generate_config.sh: append or replace in mailcow.conf
+    if grep -q '^ENABLE_IPV6=' "$MAILCOW_CONF"; then
+      sed -i "s/^ENABLE_IPV6=.*/$ENABLE_IPV6_LINE/" "$MAILCOW_CONF"
+    else
+      echo "$ENABLE_IPV6_LINE" >> "$MAILCOW_CONF"
+    fi
+  else
+    # update.sh: export into the running environment
+    export "$ENABLE_IPV6_LINE"
+  fi
+
+  echo "IPv6 configuration complete: $ENABLE_IPV6_LINE"
+}