License validation should take Sonar license file into account (#114)

Author: jonas-wielage-sonarsource

gradle-modules/src/main/kotlin/org.sonarsource.cloud-native.license-file-generator.gradle.kts

@@ -20,6 +20,7 @@ import java.nio.file.StandardCopyOption
 import org.sonarsource.cloudnative.gradle.AnalyzerLicensingPackagingRenderer
 import org.sonarsource.cloudnative.gradle.LicenseGenerationConfig
 import org.sonarsource.cloudnative.gradle.areDirectoriesEqual
+import org.sonarsource.cloudnative.gradle.areFilesEqual
 import org.sonarsource.cloudnative.gradle.copyDirectory
 
 plugins {
@@ -67,7 +68,11 @@ tasks.register("validateLicenseFiles") {
     dependsOn("generateLicenseReport")
 
     doLast {
-        if (!areDirectoriesEqual(buildLicenseOutputToCopyDir.asFile, resourceThirdPartyDir.asFile, logger)) {
+        val thirdPartyLicenseEquality = !areDirectoriesEqual(buildLicenseOutputToCopyDir.asFile, resourceThirdPartyDir.asFile, logger)
+        val sonarLicenseFile = licenseGenerationConfig.projectLicenseFile.get()
+        val sonarLicenseFileEquality =
+            areFilesEqual(sonarLicenseFile, resourceLicenseDir.file("LICENSE.txt").asFile, File("LICENSE.txt"), logger)
+        if (!thirdPartyLicenseEquality || !sonarLicenseFileEquality) {
             val message = """
                 [FAILURE] License file validation failed!
                 Generated license files differ from committed files at $resourceThirdPartyDir.

gradle-modules/src/main/kotlin/org/sonarsource/cloudnative/gradle/LicenseGenerationUtils.kt

@@ -65,19 +65,7 @@ fun areDirectoriesEqual(
             val file1 = files1[relativePath]!!
             val file2 = files2[relativePath]!!
 
-            // Quick check: compare file sizes first
-            if (file1.length() != file2.length()) {
-                logger.warn("File size mismatch: $relativePath")
-                return false
-            }
-
-            // Full check: compare byte content
-            val checksum1 = getFileChecksum(file1)
-            val checksum2 = getFileChecksum(file2)
-            if (checksum1 != checksum2) {
-                logger.warn("File content mismatch: $relativePath")
-                return false
-            }
+            return areFilesEqual(file1, file2, relativePath, logger)
         }
 
         // If all checks pass, the directories are equal
@@ -88,6 +76,28 @@ fun areDirectoriesEqual(
     }
 }
 
+fun areFilesEqual(
+    file1: File,
+    file2: File,
+    relativePath: File,
+    logger: Logger,
+): Boolean {
+    // Quick check: compare file sizes first
+    if (file1.length() != file2.length()) {
+        logger.warn("File size mismatch: $relativePath")
+        return false
+    }
+
+    // Full check: compare byte content
+    val checksum1 = getFileChecksum(file1)
+    val checksum2 = getFileChecksum(file2)
+    if (checksum1 != checksum2) {
+        logger.warn("File content mismatch: $relativePath")
+        return false
+    }
+    return true
+}
+
 fun getFileChecksum(file: File): String {
     val md = MessageDigest.getInstance("SHA-256")
     val digestBytes = md.digest(file.readBytes())