$ git clone -n https://src.fedoraproject.org/rpms/prboom.git /var/lib/mock/f45-build-28882-633/root/chroot_tmpdir/scmroot/prboom
Cloning into '/var/lib/mock/f45-build-28882-633/root/chroot_tmpdir/scmroot/prboom'...
$ git fetch origin 0afb71edc808bc29bde687c113a90da93658eb9a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/prboom
 * [new ref]         0afb71edc808bc29bde687c113a90da93658eb9a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0afb71e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild