qemu-img/convert: Use @opts for one thing only

After storing the creation options for the new image into @opts, we
fetch some things for our own information, like the backing file name,
or whether to use encryption or preallocation.

With the -n parameter, there will not be any creation options; this is
not too bad because this just means that querying a NULL @opts will
always return the default value.

However, we also use @opts for the --object options. Therefore, @opts is
not necessarily NULL if -n was specified; instead, it may contain those
options. In practice, this probably does not cause any problems because
there most likely is no object that supports any of the parameters we
query here, but this is neither something we should rely on nor does
this variable reuse make the code very nice to read.

Therefore, just use a separate variable for the --object options.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

diff --git a/qemu-img.c b/qemu-img.c
index b94fc11e67f47a5e2e884e1ddc1d4b2650a06d9e..e0503aec9b07c2a00690c92c9a68958070cf3ade 100644 (file)
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -2049,13 +2049,15 @@ static int img_convert(int argc, char **argv)
         case 'W':
             s.wr_in_order = false;
             break;
-        case OPTION_OBJECT:
-            opts = qemu_opts_parse_noisily(&qemu_object_opts,
-                                           optarg, true);
-            if (!opts) {
+        case OPTION_OBJECT: {
+            QemuOpts *object_opts;
+            object_opts = qemu_opts_parse_noisily(&qemu_object_opts,
+                                                  optarg, true);
+            if (!object_opts) {
                 goto fail_getopt;
             }
             break;
+        }
         case OPTION_IMAGE_OPTS:
             image_opts = true;
             break;