$ git clone -n https://src.fedoraproject.org/rpms/rust-coreos-installer.git /var/lib/mock/f45-build-40983-778/root/chroot_tmpdir/scmroot/rust-coreos-installer
Cloning into '/var/lib/mock/f45-build-40983-778/root/chroot_tmpdir/scmroot/rust-coreos-installer'...
$ git fetch origin d173314e0845b0783463c27bcf5c90c6ccb9c8cd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-coreos-installer
 * [new ref]         d173314e0845b0783463c27bcf5c90c6ccb9c8cd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d173314 Update to 0.27.0 upstream release