$ git clone -n https://src.fedoraproject.org/rpms/heimdal.git /var/lib/mock/f45-build-13393-450/root/chroot_tmpdir/scmroot/heimdal
Cloning into '/var/lib/mock/f45-build-13393-450/root/chroot_tmpdir/scmroot/heimdal'...
$ git fetch origin af3752666dd68b31a8c8c2470af77ab1ebc8fe10:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/heimdal
 * [new ref]         af3752666dd68b31a8c8c2470af77ab1ebc8fe10 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at af37526 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild