$ git clone -n https://src.fedoraproject.org/rpms/realtime-setup.git /var/lib/mock/f39-build-1546296-36701/root/chroot_tmpdir/scmroot/realtime-setup
Cloning into '/var/lib/mock/f39-build-1546296-36701/root/chroot_tmpdir/scmroot/realtime-setup'...
$ git fetch origin b3a88e73d01e9534789e7cb813b04263946d1828:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/realtime-setup
 * [new ref]         b3a88e73d01e9534789e7cb813b04263946d1828 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b3a88e7 fix typo in changelog date and bump release