$ git clone -n https://src.fedoraproject.org/rpms/rubygem-safe_yaml.git /var/lib/mock/f45-build-35278-694/root/chroot_tmpdir/scmroot/rubygem-safe_yaml
Cloning into '/var/lib/mock/f45-build-35278-694/root/chroot_tmpdir/scmroot/rubygem-safe_yaml'...
$ git fetch origin 8dfde2ebb3e8893030da1bac2874fdbb082b5f41:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-safe_yaml
 * [new ref]         8dfde2ebb3e8893030da1bac2874fdbb082b5f41 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8dfde2e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild