$ git clone -n https://src.fedoraproject.org/rpms/open-sans-fonts.git /var/lib/mock/f45-build-20940-576/root/chroot_tmpdir/scmroot/open-sans-fonts
Cloning into '/var/lib/mock/f45-build-20940-576/root/chroot_tmpdir/scmroot/open-sans-fonts'...
$ git fetch origin e857c25813a280bd075e0cd333501a6a62868f78:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/open-sans-fonts
 * [new ref]         e857c25813a280bd075e0cd333501a6a62868f78 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e857c25 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild