$ git clone -n https://src.fedoraproject.org/rpms/gnome-calculator.git /var/lib/mock/f41-build-852868-166508/root/chroot_tmpdir/scmroot/gnome-calculator
Cloning into '/var/lib/mock/f41-build-852868-166508/root/chroot_tmpdir/scmroot/gnome-calculator'...
$ git fetch origin 559716e0ff30084d6f11f792237e6f912eef38ce:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-calculator
 * [new ref]         559716e0ff30084d6f11f792237e6f912eef38ce -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 559716e Update to 47.0