$ git clone -n https://src.fedoraproject.org/rpms/xfce4-datetime-plugin.git /var/lib/mock/f41-build-side-1-2810778-32921/root/chroot_tmpdir/scmroot/xfce4-datetime-plugin
Cloning into '/var/lib/mock/f41-build-side-1-2810778-32921/root/chroot_tmpdir/scmroot/xfce4-datetime-plugin'...
$ git fetch origin 9b47d1dc1c26fc54239144f603b3c97fab2e787e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xfce4-datetime-plugin
 * [new ref]         9b47d1dc1c26fc54239144f603b3c97fab2e787e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9b47d1d convert GPLv2+ license to SPDX