$ git clone -n https://src.fedoraproject.org/rpms/sugar-browse.git /var/lib/mock/f40-build-1942342-25164/root/chroot_tmpdir/scmroot/sugar-browse
Cloning into '/var/lib/mock/f40-build-1942342-25164/root/chroot_tmpdir/scmroot/sugar-browse'...
$ git fetch origin 4fb2339e3d3dad194021adbdbef133ef54780a28:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sugar-browse
 * [new ref]         4fb2339e3d3dad194021adbdbef133ef54780a28 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4fb2339 Upstream already has this in the file