Add maven dependency fetcher support for MAVEN_CLI_OPTS flag used by …

…gitlab (#4631)

joern-cli/frontends/x2cpg/src/main/scala/io/joern/x2cpg/utils/dependency/MavenDependencies.scala

@@ -9,8 +9,23 @@ import scala.util.{Failure, Success}
 object MavenDependencies {
   private val logger = LoggerFactory.getLogger(getClass)
 
+  private val MavenCliOpts = "MAVEN_CLI_OPTS"
+  // we can't use -Dmdep.outputFile because that keeps overwriting its own output for each sub-project it's running for
+  // also separate this from fetchCommandWithOpts to log a version that clearly separates options we provide from
+  // options specified by the user via the MAVEN_CLI_OPTS environment variable, while also making it clear that this
+  // environment variable is being considered.
   private val fetchCommand =
-    "mvn --fail-never -B dependency:build-classpath -DincludeScope=compile -Dorg.slf4j.simpleLogger.defaultLogLevel=info -Dorg.slf4j.simpleLogger.logFile=System.out"
+    s"mvn $$$MavenCliOpts --fail-never -B dependency:build-classpath -DincludeScope=compile -Dorg.slf4j.simpleLogger.defaultLogLevel=info -Dorg.slf4j.simpleLogger.logFile=System.out"
+
+  private val fetchCommandWithOpts = {
+    // These options suppress output, so if they're provided we won't get any results.
+    // "-q" and "--quiet" are the only ones that would realistically be used.
+    val optionsToStrip = Set("-h", "--help", "-q", "--quiet", "-v", "--version")
+
+    val mavenOpts         = Option(System.getenv(MavenCliOpts)).getOrElse("")
+    val mavenOptsStripped = mavenOpts.split(raw"\s").filterNot(optionsToStrip.contains).mkString(" ")
+    fetchCommand.replace(s"$$$MavenCliOpts", mavenOptsStripped)
+  }
 
   private def logErrors(output: String): Unit = {
 
@@ -25,8 +40,7 @@ object MavenDependencies {
   }
 
   private[dependency] def get(projectDir: Path): Option[collection.Seq[String]] = {
-    // we can't use -Dmdep.outputFile because that keeps overwriting its own output for each sub-project it's running for
-    val lines = ExternalCommand.run(fetchCommand, projectDir.toString) match {
+    val lines = ExternalCommand.run(fetchCommandWithOpts, projectDir.toString) match {
       case Success(lines) =>
         if (lines.contains("[INFO] Build failures were ignored.")) {
           logErrors(lines.mkString(System.lineSeparator()))