$ git clone -n https://src.fedoraproject.org/rpms/libnfs.git /var/lib/mock/f40-build-2605449-63474/root/chroot_tmpdir/scmroot/libnfs
Cloning into '/var/lib/mock/f40-build-2605449-63474/root/chroot_tmpdir/scmroot/libnfs'...
$ git fetch origin c05eafb599628407d567f64f56c6913924ce6494:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libnfs
 * [new ref]         c05eafb599628407d567f64f56c6913924ce6494 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c05eafb Update to 5.0.3 (RHBZ#2263724)