$ git clone -n https://src.fedoraproject.org/rpms/rubygem-colorator.git /var/lib/mock/f45-build-34828-691/root/chroot_tmpdir/scmroot/rubygem-colorator
Cloning into '/var/lib/mock/f45-build-34828-691/root/chroot_tmpdir/scmroot/rubygem-colorator'...
$ git fetch origin 32072e6e8c2ea1d195888c0d39603905bca60d43:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-colorator
 * [new ref]         32072e6e8c2ea1d195888c0d39603905bca60d43 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 32072e6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild