feat: wire native MariaDB port takeover into install_db.sh when PORT=3306

scripts/install_db.sh

@@ -17,6 +17,7 @@ ALT_MYSQL_CONF="/usr/local/directadmin/conf/alt-mysql.conf"
 ALT_MY_CNF="/usr/local/directadmin/conf/alt-my.cnf"
 ALT_METADATA_ENV="/usr/local/directadmin/conf/alt-mariadb.env"
 INSTANCE_CNF="/etc/alt-mariadb.cnf"
+NATIVE_TAKEOVER_SCRIPT="${NATIVE_TAKEOVER_SCRIPT:-$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/setup/native_mariadb_port_takeover.sh}"
 SERVICE_NAME="alt-mariadb"
 SERVICE_FILE="/etc/systemd/system/alt-mariadb.service"
 LOG_DIR="/var/log/alt-mariadb"
@@ -124,6 +125,17 @@ require_root() {
     fi
 }
 
+maybe_takeover_native_port() {
+    if [[ "$PORT" != "3306" ]]; then
+        return 0
+    fi
+
+    [[ -x "$NATIVE_TAKEOVER_SCRIPT" ]] || die "Nie znaleziono skryptu przejęcia portu natywnego MariaDB: $NATIVE_TAKEOVER_SCRIPT"
+
+    log "PORT=3306 wybrany dla alt-mariadb - uruchamiam przejęcie portu natywnej instancji MariaDB."
+    "$NATIVE_TAKEOVER_SCRIPT" || die "Przejęcie portu natywnej instancji MariaDB nie powiodło się. Przerwano instalację alt-mariadb."
+}
+
 detect_os() {
     [[ -r /etc/os-release ]] || die "Nie można odczytać /etc/os-release."
     . /etc/os-release
@@ -852,6 +864,7 @@ main() {
     validate_port
     require_root
     detect_os
+    maybe_takeover_native_port
     load_da_credentials
     validate_paths
     install_dependencies

tests/install_db_native_takeover_wiring_test.sh

@@ -0,0 +1,72 @@
+#!/bin/bash
+set -euo pipefail
+
+PLUGIN_DIR="$(cd "$(dirname "$0")/.." && pwd)"
+REAL_SCRIPT="$PLUGIN_DIR/scripts/install_db.sh"
+TMP_DIR="$(mktemp -d)"
+trap 'rm -rf "$TMP_DIR"' EXIT
+
+fail() {
+  echo "FAIL: $*" >&2
+  exit 1
+}
+
+# Extract the exact, real maybe_takeover_native_port() function body from the
+# real script (rather than reimplementing it), so this test exercises the
+# actual production logic without triggering the script's own main() (which
+# needs a full install environment).
+FUNCS_FILE="$TMP_DIR/funcs.sh"
+{
+  echo '#!/bin/bash'
+  echo 'log() { echo "[INFO] $*"; }'
+  echo 'die() { echo "[BŁĄD] $*" >&2; exit 1; }'
+  awk '/^maybe_takeover_native_port\(\)/,/^\}/' "$REAL_SCRIPT"
+} > "$FUNCS_FILE"
+
+grep -q '^maybe_takeover_native_port()' "$FUNCS_FILE" \
+  || fail "could not extract maybe_takeover_native_port() from $REAL_SCRIPT"
+
+# shellcheck source=/dev/null
+source "$FUNCS_FILE"
+
+mkdir -p "$TMP_DIR/setup"
+CALL_LOG="$TMP_DIR/calls.log"
+cat > "$TMP_DIR/setup/native_mariadb_port_takeover.sh" <<EOF
+#!/bin/bash
+echo "CALLED" >> "$CALL_LOG"
+exit 0
+EOF
+chmod 755 "$TMP_DIR/setup/native_mariadb_port_takeover.sh"
+
+NATIVE_TAKEOVER_SCRIPT="$TMP_DIR/setup/native_mariadb_port_takeover.sh"
+
+# --- Scenario 1: PORT=3306 must call the takeover script ---
+PORT="3306"
+: > "$CALL_LOG"
+maybe_takeover_native_port
+grep -Fxq "CALLED" "$CALL_LOG" || fail "expected takeover script to be called when PORT=3306"
+
+# --- Scenario 2: PORT!=3306 must NOT call the takeover script ---
+PORT="33033"
+: > "$CALL_LOG"
+maybe_takeover_native_port
+[ ! -s "$CALL_LOG" ] || fail "expected takeover script NOT to be called when PORT=33033"
+
+# --- Scenario 3: takeover script failure must abort (non-zero exit) ---
+cat > "$TMP_DIR/setup/native_mariadb_port_takeover.sh" <<EOF
+#!/bin/bash
+echo "CALLED-FAIL" >> "$CALL_LOG"
+exit 1
+EOF
+chmod 755 "$TMP_DIR/setup/native_mariadb_port_takeover.sh"
+
+PORT="3306"
+set +e
+FAIL_OUTPUT="$(maybe_takeover_native_port 2>&1)"
+FAIL_STATUS=$?
+set -e
+[ "$FAIL_STATUS" -ne 0 ] || fail "maybe_takeover_native_port should fail when the takeover script fails"
+printf '%s\n' "$FAIL_OUTPUT" | grep -Fq "Przejęcie portu" \
+  || fail "expected a clear error message on takeover failure, got: $FAIL_OUTPUT"
+
+echo "install_db_native_takeover_wiring_test: OK"