红帽全球峰会7.139.6. Kow
仅下载指定的映像，而不是整个镜像链。
如果为 true，在使用格式="raw" 和方向="download" 时，传输仅包含来自指定磁盘快照的数据，未分配区域则报告为漏洞。默认情况下，传输包含来自所有磁盘快照的数据。
指定磁盘快照时，传输仅包含指定磁盘快照的数据。指定磁盘时，传输仅包含来自活动磁盘 snaphost 的数据。
如果没有使用 format="raw" 或方向="upload"，这个参数无效。
示例：下载一个快照：
<image_transfer>
<snapshot id="2fb24fa2-a5db-446b-b733-4654661cd56d"/>
<direction>download</direction>
<format>raw</format>
<shallow>true</shallow>
</image_transfer>要下载活跃的快照磁盘镜像（这不能作为磁盘快照访问），请指定磁盘：
<image_transfer>
<disk id="ff6be46d-ef5d-41d6-835c-4a68e8956b00"/>
<direction>download</direction>
<format>raw</format>
<shallow>true</shallow>
</image_transfer>在这两种情况下，您现在可以使用 imageio 客户端下载 qcow2 镜像：
from ovirt_imageio import client
client.download(
transfer.transfer_url,
"51275e7d-42e9-491f-9d65-b9211c897eac",
backing_file="07c0ccac-0845-4665-9097-d0a3b16cf43b",
backing_format="qcow2")
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