block: Relative backing file for image creation
Relative backing filenames are always relative to the backed image's directory; the same applies to image creation. Therefore, if the backing file has to be opened for determining its size (in case the size has not been explicitly specified) its filename should be interpreted relative to the new image's base directory and not relative to qemu's working directory. Signed-off-by: NMax Reitz <mreitz@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NFam Zheng <famz@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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