$ git clone -n https://src.fedoraproject.org/rpms/rust-zvariant.git /var/lib/mock/f42-build-side-1-3585338-46904/root/chroot_tmpdir/scmroot/rust-zvariant
Cloning into '/var/lib/mock/f42-build-side-1-3585338-46904/root/chroot_tmpdir/scmroot/rust-zvariant'...
$ git fetch origin f44cb2974cc8a517a80632ff4a6e410a274a49d9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-zvariant
 * [new ref]         f44cb2974cc8a517a80632ff4a6e410a274a49d9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f44cb29 Update to version 5.6.0