From f4e7c792d58cbd7318fc30519c551e4fe0cd98de Mon Sep 17 00:00:00 2001
From: Peter Krempa <pkrempa@redhat.com>
Date: Mon, 20 Jan 2020 13:02:58 +0100
Subject: [PATCH] qemu: block: Don't skip creation of 'luks' formatted images

libvirt treats 'luks' images as raw+encryption. The logic in
qemuBlockStorageSourceCreateFormat skipped the creation if the requested
image was raw but didn't take into account the encryption.

This manifested itself e.g. when attempting to do a virsh blockcopy with
the following XML:

    <disk type='file' device='disk'>
      <driver name='qemu' type='raw'/>
      <source file='/tmp/enccpy'>
        <encryption format='luks'>
          <secret type='passphrase' uuid='0a81f5b2-8403-7b23-c8d6-21ccc2f80d6f'/>
        </encryption>
      </source>
    </disk>

Where qemu would report the following error:

 unable to execute QEMU command 'blockdev-add': Volume is not in LUKS format

rather than actually formatting the image first.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
---
 src/qemu/qemu_block.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/qemu/qemu_block.c b/src/qemu/qemu_block.c
index eab21bc107..22f03da485 100644
--- a/src/qemu/qemu_block.c
+++ b/src/qemu/qemu_block.c
@@ -2479,7 +2479,8 @@ qemuBlockStorageSourceCreateFormat(virDomainObjPtr vm,
     g_autoptr(virJSONValue) createformatprops = NULL;
     int ret;
 
-    if (src->format == VIR_STORAGE_FILE_RAW)
+    if (src->format == VIR_STORAGE_FILE_RAW &&
+        !src->encryption)
         return 0;
 
     if (qemuBlockStorageSourceCreateGetFormatProps(src, backingStore,