$ git clone -n https://src.fedoraproject.org/rpms/kwalletmanager.git /var/lib/mock/f41-build-side-1-2643993-26963/root/chroot_tmpdir/scmroot/kwalletmanager
Cloning into '/var/lib/mock/f41-build-side-1-2643993-26963/root/chroot_tmpdir/scmroot/kwalletmanager'...
$ git fetch origin de7b8144492899a31bd71512cd4d0c1ed89fa0e4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kwalletmanager
 * [new ref]         de7b8144492899a31bd71512cd4d0c1ed89fa0e4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at de7b814 convert GPLv2+ license to SPDX