$ git clone -n https://src.fedoraproject.org/rpms/eg.git /var/lib/mock/f45-build-8039-372/root/chroot_tmpdir/scmroot/eg
Cloning into '/var/lib/mock/f45-build-8039-372/root/chroot_tmpdir/scmroot/eg'...
$ git fetch origin 9f379b0b5c79b1047064e1b116e2e9b25db24286:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/eg
 * [new ref]         9f379b0b5c79b1047064e1b116e2e9b25db24286 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9f379b0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild