$ git clone -n https://src.fedoraproject.org/rpms/rust-cbc0.1.git /var/lib/mock/f45-build-40711-775/root/chroot_tmpdir/scmroot/rust-cbc0.1
Cloning into '/var/lib/mock/f45-build-40711-775/root/chroot_tmpdir/scmroot/rust-cbc0.1'...
$ git fetch origin ff888f8ad9c54f64ff9b96b801bdcb7c0d070afe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cbc0.1
 * [new ref]         ff888f8ad9c54f64ff9b96b801bdcb7c0d070afe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ff888f8 Initial import (cbc v0.1 compat package)