$ git clone -n https://src.fedoraproject.org/rpms/xscreensaver.git /var/lib/mock/f41-build-860089-168769/root/chroot_tmpdir/scmroot/xscreensaver
Cloning into '/var/lib/mock/f41-build-860089-168769/root/chroot_tmpdir/scmroot/xscreensaver'...
$ git fetch origin 7bcdc92a6cf882787d7b6cb52082a70681d7794f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xscreensaver
 * [new ref]         7bcdc92a6cf882787d7b6cb52082a70681d7794f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7bcdc92 Rebuild for ffmpeg 7