$ git clone -n https://src.fedoraproject.org/rpms/general-purpose-preprocessor.git /var/lib/mock/f45-build-9719-408/root/chroot_tmpdir/scmroot/general-purpose-preprocessor
Cloning into '/var/lib/mock/f45-build-9719-408/root/chroot_tmpdir/scmroot/general-purpose-preprocessor'...
$ git fetch origin 6e65fbe1c41c4c7df6890fe943e9e3a0887d9049:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/general-purpose-preprocessor
 * [new ref]         6e65fbe1c41c4c7df6890fe943e9e3a0887d9049 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6e65fbe Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild