$ git clone -n https://src.fedoraproject.org/rpms/rust-count-zeroes.git /var/lib/mock/f45-build-40979-778/root/chroot_tmpdir/scmroot/rust-count-zeroes
Cloning into '/var/lib/mock/f45-build-40979-778/root/chroot_tmpdir/scmroot/rust-count-zeroes'...
$ git fetch origin 27968dcbb4910498c9526359496cf69b61de6037:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-count-zeroes
 * [new ref]         27968dcbb4910498c9526359496cf69b61de6037 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 27968dc Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild