On Mon, Feb 27, 2023 at 3:56 PM Richard W.M. Jones <rjo...@redhat.com> wrote: > > > https://github.com/kubevirt/containerized-data-importer/issues/1520 > > Hi Eric, > > We had a question from the Kubevirt team related to the above issue. > The question is roughly if it's possible to calculate the checksum of > an image as an nbdkit filter and/or in the qemu block layer. > > Supplemental #1: could qemu-img convert calculate a checksum as it goes > along? > > Supplemental #2: could we detect various sorts of common errors, such > a webserver that is incorrectly configured and serves up an error page > containing "<html>"; or something which is supposed to be a disk image > but does not "look like" (in some ill-defined sense) a disk image, > eg. it has no partition table. > > I'm not sure if qemu has any existing features covering the above (and > I know for sure that nbdkit doesn't). > > One issue is that calculating a checksum involves a linear scan of the > image, although we can at least skip holes.
Kubvirt can use blksum https://fosdem.org/2023/schedule/event/vai_blkhash_fast_disk/ But we need to package it for Fedora/CentOS Stream. I also work on "qemu-img checksum", getting more reviews on this can help: Lastest version: https://lists.nongnu.org/archive/html/qemu-block/2022-11/msg00971.html Last reveiw are here: https://lists.nongnu.org/archive/html/qemu-block/2022-12/ More work is needed on the testing framework changes. Nir _______________________________________________ Libguestfs mailing list Libguestfs@redhat.com https://listman.redhat.com/mailman/listinfo/libguestfs
