$ git clone -n https://src.fedoraproject.org/rpms/gwenhywfar.git /var/lib/mock/f45-build-13286-448/root/chroot_tmpdir/scmroot/gwenhywfar
Cloning into '/var/lib/mock/f45-build-13286-448/root/chroot_tmpdir/scmroot/gwenhywfar'...
$ git fetch origin de0911d7b65b36ebd9b24bd30c5af4361d0ff054:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gwenhywfar
 * [new ref]         de0911d7b65b36ebd9b24bd30c5af4361d0ff054 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at de0911d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild