When referring to a specific image version in the disk image URN, and
that image is an *imported* system image, we are almost certainly referring to a version related to the origin image, not the local copy (which is not in sync with the origin wrt the history). In that case, we can use the hash from the image server to track down the local version. Aside; If I were going to redo the import mechanism, I would make image provenance the default for everyone, and make the option be whether to save or delete the image file (that was the entire reason I made provenance optional, most sites especially geni racks, do not have enough storage to maintain old images. And image import would always import the history too, which is something I did later when we thought deltas were going to solve our problems.
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