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由 Xu Tian 提交于
qemu-img rebase function used to changes backing_file and backing_file format for an image file; In this case, we create snapshots "base->sn1->sn2", then rebase sn2's backing_file to base, then bootup with sn2 and check sn2's backing_file is base; Signed-off-by: NXu Tian <xutian@redhat.com>
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