[Qemu-block] [PATCH 1/7] qemu-img: Amendment support implies create_opts

[Max Reitz]

Instead of checking whether a driver has a non-NULL create_opts we
should check whether it supports image amendment in the first place.  If
it does, it must have create_opts.

On the other hand, if it does not have create_opts (so it does not
support amendment either), the error message "does not support any
options" is a bit useless.  Stating clearly that the driver has no
amendment support whatsoever is probably better.

Signed-off-by: Max Reitz <address@hidden>
---
 qemu-img.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/qemu-img.c b/qemu-img.c
index 855fa52514..f60b22769e 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -3709,13 +3709,16 @@ static int img_amend(int argc, char **argv)
         goto out;
     }
 
-    if (!bs->drv->create_opts) {
-        error_report("Format driver '%s' does not support any options to 
amend",
+    if (!bs->drv->bdrv_amend_options) {
+        error_report("Format driver '%s' does not support option amendment",
                      fmt);
         ret = -1;
         goto out;
     }
 
+    /* Every driver supporting amendment must have create_opts */
+    assert(bs->drv->create_opts);
+
     create_opts = qemu_opts_append(create_opts, bs->drv->create_opts);
     opts = qemu_opts_create(create_opts, NULL, 0, &error_abort);
     qemu_opts_do_parse(opts, options, NULL, &err);
-- 
2.14.3