$ git clone -n https://src.fedoraproject.org/rpms/gnome-tour.git /var/lib/mock/f41-build-side-1-2811747-32932/root/chroot_tmpdir/scmroot/gnome-tour
Cloning into '/var/lib/mock/f41-build-side-1-2811747-32932/root/chroot_tmpdir/scmroot/gnome-tour'...
$ git fetch origin a73f15c10247ef442a9f5fca6803681cbbf44dc7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-tour
 * [new ref]         a73f15c10247ef442a9f5fca6803681cbbf44dc7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a73f15c Update to 47.0