[Qemu-trivial] [PATCH] block/qcow: Improve error when opening qcow2 files as qcow

[John Snow]

Reported-by: address@hidden
Fixes: https://bugs.launchpad.net/bugs/1832914
Signed-off-by: John Snow <address@hidden>
---
 block/qcow.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/block/qcow.c b/block/qcow.c
index 6dee5bb792..a9cb6ae0bd 100644
--- a/block/qcow.c
+++ b/block/qcow.c
@@ -156,7 +156,12 @@ static int qcow_open(BlockDriverState *bs, QDict *options, 
int flags,
         goto fail;
     }
     if (header.version != QCOW_VERSION) {
-        error_setg(errp, "Unsupported qcow version %" PRIu32, header.version);
+        error_setg(errp, "qcow (v%d) does not support qcow version %" PRIu32,
+                   QCOW_VERSION, header.version);
+        if (header.version == 2 || header.version == 3) {
+            error_append_hint(errp, "Try the 'qcow2' driver instead.");
+        }
+
         ret = -ENOTSUP;
         goto fail;
     }
-- 
2.21.0