$ git clone -n https://src.fedoraproject.org/rpms/xfce4-timer-plugin.git /var/lib/mock/f41-build-side-1-2671332-29139/root/chroot_tmpdir/scmroot/xfce4-timer-plugin
Cloning into '/var/lib/mock/f41-build-side-1-2671332-29139/root/chroot_tmpdir/scmroot/xfce4-timer-plugin'...
$ git fetch origin 45cea068c13ced83df4e8132e912e295b18a35d5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xfce4-timer-plugin
 * [new ref]         45cea068c13ced83df4e8132e912e295b18a35d5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 45cea06 convert GPLv2+ license to SPDX