$ git clone -n https://src.fedoraproject.org/rpms/libqtxdg.git /var/lib/mock/f41-build-840323-160609/root/chroot_tmpdir/scmroot/libqtxdg
Cloning into '/var/lib/mock/f41-build-840323-160609/root/chroot_tmpdir/scmroot/libqtxdg'...
$ git fetch origin 15e051addb50b0fcc81e72a82f7fd769fdfe943f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libqtxdg
 * [new ref]         15e051addb50b0fcc81e72a82f7fd769fdfe943f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 15e051a 4.0.0