$ git clone -n https://src.fedoraproject.org/rpms/rust-vhost-user-backend.git /var/lib/mock/f39-build-2230657-53243/root/chroot_tmpdir/scmroot/rust-vhost-user-backend
Cloning into '/var/lib/mock/f39-build-2230657-53243/root/chroot_tmpdir/scmroot/rust-vhost-user-backend'...
$ git fetch origin e16bb616747cf3c2ecae68bbcda7fd55005c2ed2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-vhost-user-backend
 * [new ref]         e16bb616747cf3c2ecae68bbcda7fd55005c2ed2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e16bb61 Update to version 0.11.0; Fixes RHBZ#2248536