ArchiveUtils: Also restore Unix mode bits when unzip-ing

Unfortunately, we still need to make BoyerLc executable manually.

scanner/src/main/kotlin/scanners/BoyterLc.kt

@@ -114,8 +114,7 @@ class BoyterLc(config: ScannerConfiguration) : LocalScanner(config) {
             scannerArchive.unpack(unpackDir)
 
             if (!OS.isWindows) {
-                // The Linux version is distributed as a ZIP, but our ZIP unpacker seems to be unable to properly handle
-                // Unix mode bits.
+                // The Linux version is distributed as a ZIP, but without having the Unix executable mode bits stored.
                 File(unpackDir, command()).setExecutable(true)
             }
 

utils/src/main/kotlin/ArchiveUtils.kt

@@ -117,6 +117,15 @@ fun File.unpackZip(targetDirectory: File) {
             target.outputStream().use { output ->
                 it.copyTo(output)
             }
+
+            if (!OS.isWindows) {
+                // Note: In contrast to Java, Kotlin does not support octal literals, see
+                // https://kotlinlang.org/docs/reference/basic-types.html#literal-constants.
+                // The bit-triplets from left to right stand for user, groups, other, respectively.
+                if (entry.unixMode and 0b001_000_001 != 0) {
+                    target.setExecutable(true, (entry.unixMode and 0b000_000_001) == 0)
+                }
+            }
         }
     }
 }