qemu-img: add support for --object with 'dd' command

The qemu-img dd command added --image-opts support, but missed
the corresponding --object support. This prevented passing
secrets (eg auth passwords) needed by certain disk images.
Reviewed-by: NFam Zheng <famz@redhat.com>
Reviewed-by: NMax Reitz <mreitz@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
Message-id: 20170515164712.6643-2-berrange@redhat.com
Signed-off-by: NMax Reitz <mreitz@redhat.com>

qemu-img.c

@@ -4158,6 +4158,7 @@ static int img_dd(int argc, char **argv)
     };
     const struct option long_options[] = {
         { "help", no_argument, 0, 'h'},
+        { "object", required_argument, 0, OPTION_OBJECT},
         { "image-opts", no_argument, 0, OPTION_IMAGE_OPTS},
         { "force-share", no_argument, 0, 'U'},
         { 0, 0, 0, 0 }
@@ -4186,6 +4187,15 @@ static int img_dd(int argc, char **argv)
         case 'U':
             force_share = true;
             break;
+        case OPTION_OBJECT: {
+            QemuOpts *opts;
+            opts = qemu_opts_parse_noisily(&qemu_object_opts,
+                                           optarg, true);
+            if (!opts) {
+                ret = -1;
+                goto out;
+            }
+        }   break;
         case OPTION_IMAGE_OPTS:
             image_opts = true;
             break;
@@ -4230,6 +4240,14 @@ static int img_dd(int argc, char **argv)
         ret = -1;
         goto out;
     }
+
+    if (qemu_opts_foreach(&qemu_object_opts,
+                          user_creatable_add_opts_foreach,
+                          NULL, NULL)) {
+        ret = -1;
+        goto out;
+    }
+
     blk1 = img_open(image_opts, in.filename, fmt, 0, false, false,
                     force_share);