$ git clone -n https://src.fedoraproject.org/rpms/rust-vhost-user-backend.git /var/lib/mock/f40-build-2249557-54007/root/chroot_tmpdir/scmroot/rust-vhost-user-backend
Cloning into '/var/lib/mock/f40-build-2249557-54007/root/chroot_tmpdir/scmroot/rust-vhost-user-backend'...
$ git fetch origin a1a09a5561062bc963159bba975da1431aef2dce:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-vhost-user-backend
 * [new ref]         a1a09a5561062bc963159bba975da1431aef2dce -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a1a09a5 Update to version 0.12.0; Fixes RHBZ#2248536