$ git clone -n https://src.fedoraproject.org/rpms/rust-zune-core.git /var/lib/mock/f45-build-46403-834/root/chroot_tmpdir/scmroot/rust-zune-core
Cloning into '/var/lib/mock/f45-build-46403-834/root/chroot_tmpdir/scmroot/rust-zune-core'...
$ git fetch origin 885835b8d9248c251b8f337ec4816e05e94fc9e1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-zune-core
 * [new ref]         885835b8d9248c251b8f337ec4816e05e94fc9e1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 885835b Update to version 0.5.3; Fixes RHBZ#2512597