$ git clone -n https://src.fedoraproject.org/rpms/dub.git /var/lib/mock/f45-build-51923-905/root/chroot_tmpdir/scmroot/dub
Cloning into '/var/lib/mock/f45-build-51923-905/root/chroot_tmpdir/scmroot/dub'...
$ git fetch origin 8ff8fd0e84416f2999b974450d920f650bec6bb2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dub
 * [new ref]         8ff8fd0e84416f2999b974450d920f650bec6bb2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8ff8fd0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild