When using the `image_decompression` plugin with `glance-direct` import method, the import fails with an `UploadException` due to size mismatch between the decompressed image data and the image's recorded size. The reason for this during glance-direct method /v2/images/{image_id}/stage api is called which sets the compressed image size to the image and decompression happens during later stage while actually importing the image. Once import workflow is complete it verifies the actual data written with the size set to image and fails there with size mismatch error `glance.common.exception.UploadException: size of uploaded data is different from current value set on the image.` [1].

[1] https://github.com/openstack/glance/blob/master/glance/location.py#L582

Expected behaviour:
Once image is decompressed the actual image size should be set to the image in image decompression plugin itself.

Workaround:

Use web-download import method of glance to directly upload compressed image from the web.