$ git clone -n https://src.fedoraproject.org/rpms/ghc-req.git /var/lib/mock/f45-build-52220-908/root/chroot_tmpdir/scmroot/ghc-req
Cloning into '/var/lib/mock/f45-build-52220-908/root/chroot_tmpdir/scmroot/ghc-req'...
$ git fetch origin d65298c5c851336baf22daf72c621b317433f80e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-req
 * [new ref]         d65298c5c851336baf22daf72c621b317433f80e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d65298c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild