$ git clone -n https://src.fedoraproject.org/rpms/xfce4-taskmanager.git /var/lib/mock/f41-build-side-1-2826621-33435/root/chroot_tmpdir/scmroot/xfce4-taskmanager
Cloning into '/var/lib/mock/f41-build-side-1-2826621-33435/root/chroot_tmpdir/scmroot/xfce4-taskmanager'...
$ git fetch origin 5cff1f676415620fcdbbd61be8ac8fe213f558d4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xfce4-taskmanager
 * [new ref]         5cff1f676415620fcdbbd61be8ac8fe213f558d4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5cff1f6 convert GPLv2+ license to SPDX