feat(PackageManager): Support path excludes in findManagedFiles()

This allows skipping projects in specific paths already before
starting the analysis. That way problematic / large projects that are
irrelevant compliance-wise can be excluded leading to reduced resource
usage and analysis time.

Signed-off-by: Oliver Heger <[email protected]>

Author: oheger-bosch

analyzer/src/main/kotlin/PackageManager.kt

@@ -27,6 +27,7 @@ import java.nio.file.Path
 import java.nio.file.SimpleFileVisitor
 import java.nio.file.attribute.BasicFileAttributes
 
+import kotlin.io.path.pathString
 import kotlin.time.measureTime
 
 import org.apache.logging.log4j.kotlin.Logging
@@ -99,20 +100,25 @@ abstract class PackageManager(
 
         /**
          * Recursively search the [directory] for files managed by any of the [packageManagers]. The search is performed
-         * depth-first so that root project files are found before any subproject files for a specific manager.
+         * depth-first so that root project files are found before any subproject files for a specific manager. Path
+         * excludes defined by the given [excludes] are taken into account; the corresponding directories are skipped.
          */
         fun findManagedFiles(
             directory: File,
-            packageManagers: Collection<PackageManagerFactory> = ALL.values
+            packageManagers: Collection<PackageManagerFactory> = ALL.values,
+            excludes: Excludes = EMPTY_EXCLUDES
         ): ManagedProjectFiles {
             require(directory.isDirectory) {
                 "The provided path is not a directory: ${directory.absolutePath}"
             }
 
+            logger.debug { "Searching for managed files using the following excludes: $excludes" }
+
             val result = mutableMapOf<PackageManagerFactory, MutableList<File>>()
+            val rootPath = directory.toPath()
 
             Files.walkFileTree(
-                directory.toPath(),
+                rootPath,
                 object : SimpleFileVisitor<Path>() {
                     override fun preVisitDirectory(dir: Path, attributes: BasicFileAttributes): FileVisitResult {
                         if (IGNORED_DIRECTORY_MATCHERS.any { it.matches(dir) }) {
@@ -123,6 +129,14 @@ abstract class PackageManager(
                             return FileVisitResult.SKIP_SUBTREE
                         }
 
+                        if (excludes.isPathExcluded(rootPath.relativize(dir).pathString)) {
+                            logger.info {
+                                "Not analyzing directory '$dir' as it is matched by a path exclude."
+                            }
+
+                            return FileVisitResult.SKIP_SUBTREE
+                        }
+
                         val dirAsFile = dir.toFile()
 
                         // Note that although FileVisitOption.FOLLOW_LINKS is not set, this would still follow junctions

analyzer/src/test/kotlin/PackageManagerTest.kt

@@ -29,10 +29,16 @@ import io.kotest.matchers.maps.beEmpty
 import io.kotest.matchers.should
 import io.kotest.matchers.shouldBe
 
+import java.io.File
+
 import org.ossreviewtoolkit.analyzer.managers.*
 import org.ossreviewtoolkit.model.VcsInfo
 import org.ossreviewtoolkit.model.VcsType
+import org.ossreviewtoolkit.model.config.Excludes
+import org.ossreviewtoolkit.model.config.PathExclude
+import org.ossreviewtoolkit.model.config.PathExcludeReason
 import org.ossreviewtoolkit.utils.test.createSpecTempDir
+import org.ossreviewtoolkit.utils.test.createTestTempDir
 
 class PackageManagerTest : WordSpec({
     val definitionFiles = listOf(
@@ -71,11 +77,7 @@ class PackageManagerTest : WordSpec({
     val projectDir = createSpecTempDir()
 
     beforeSpec {
-        definitionFiles.forEach { file ->
-            projectDir.resolve(file).also { dir ->
-                dir.parentFile.mkdirs()
-            }.writeText("Dummy text to avoid the file to be empty, as empty files are skipped.")
-        }
+        definitionFiles.writeFiles(projectDir)
     }
 
     "findManagedFiles" should {
@@ -88,11 +90,7 @@ class PackageManagerTest : WordSpec({
                 it is Unmanaged.Factory
             }
 
-            // The keys in expected and actual maps of definition files are different instances of package manager
-            // factories. So to compare values use the package manager types as keys instead.
-            val managedFilesByName = managedFiles.map { (manager, files) ->
-                manager.type to files.map { it.relativeTo(projectDir).invariantSeparatorsPath }
-            }.toMap()
+            val managedFilesByName = managedFiles.groupByName(projectDir)
 
             assertSoftly {
                 managedFilesByName["Bower"] should containExactly("bower/bower.json")
@@ -144,11 +142,7 @@ class PackageManagerTest : WordSpec({
 
             managedFiles.size shouldBe 3
 
-            // The keys in expected and actual maps of definition files are different instances of package manager
-            // factories. So to compare values use the package manager types as keys instead.
-            val managedFilesByName = managedFiles.map { (manager, files) ->
-                manager.type to files.map { it.relativeTo(projectDir).invariantSeparatorsPath }
-            }.toMap()
+            val managedFilesByName = managedFiles.groupByName(projectDir)
 
             managedFilesByName["Gradle"] should containExactlyInAnyOrder(
                 "gradle-groovy/build.gradle",
@@ -167,6 +161,26 @@ class PackageManagerTest : WordSpec({
             managedFiles should beEmpty()
         }
 
+        "take path excludes into account" {
+            val tempDir = "test/"
+            val definitionFilesWithExcludes = definitionFiles +
+                    listOf("pom.xml", "build.gradle", "build.sbt").map { "$tempDir$it" }
+            val rootDir = createTestTempDir()
+            definitionFilesWithExcludes.writeFiles(rootDir)
+
+            val pathExclude = PathExclude("$tempDir**", PathExcludeReason.TEST_OF)
+            val excludes = Excludes(paths = listOf(pathExclude))
+
+            val managedFilesByName = PackageManager.findManagedFiles(rootDir, excludes = excludes).groupByName(rootDir)
+
+            managedFilesByName["Gradle"] should containExactlyInAnyOrder(
+                "gradle-groovy/build.gradle",
+                "gradle-kotlin/build.gradle.kts"
+            )
+            managedFilesByName["Maven"] should containExactly("maven/pom.xml")
+            managedFilesByName["SBT"] should containExactly("sbt/build.sbt")
+        }
+
         "fail if the provided file is not a directory" {
             shouldThrow<IllegalArgumentException> {
                 PackageManager.findManagedFiles(projectDir.resolve("pom.xml"))
@@ -221,3 +235,24 @@ class PackageManagerTest : WordSpec({
         }
     }
 })
+
+/**
+ * Transform this map with definition files grouped by package manager factories, so that the results of specific
+ * package managers can be easily accessed. The keys in expected and actual maps of definition files are different
+ * instances of package manager factories. So to compare values use the package manager types as keys instead.
+ */
+private fun ManagedProjectFiles.groupByName(projectDir: File) =
+    map { (manager, files) ->
+        manager.type to files.map { it.relativeTo(projectDir).invariantSeparatorsPath }
+    }.toMap()
+
+/**
+ * Create files with a dummy content in the given [directory] for all the path names in this collection.
+ */
+private fun Collection<String>.writeFiles(directory: File) {
+    forEach { file ->
+        directory.resolve(file).also { dir ->
+            dir.parentFile.mkdirs()
+        }.writeText("Dummy text to avoid the file to be empty, as empty files are skipped.")
+    }
+}