util: detect LUKS encryption scheme in qcow2 files

Crypt method number 2 indicates LUKS format.

Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

src/util/virstoragefile.c

@@ -290,6 +290,22 @@ static struct FileEncryptionInfo const qcow2EncryptionInfo[] = {
 
         .payloadOffset = -1,
     },
+    {
+        .format = VIR_STORAGE_ENCRYPTION_FORMAT_LUKS,
+
+        .magicOffset = 0,
+        .magic = NULL,
+        .endian = LV_BIG_ENDIAN,
+
+        .versionOffset  = -1,
+        .versionSize = 0,
+        .versionNumbers = {},
+
+        .modeOffset = QCOW2_HDR_CRYPT,
+        .modeValue = 2,
+
+        .payloadOffset = -1,
+    },
     { 0 }
 };