$ git clone -n https://src.fedoraproject.org/rpms/R-rprojroot.git /var/lib/mock/f40-build-2033171-47778/root/chroot_tmpdir/scmroot/R-rprojroot
Cloning into '/var/lib/mock/f40-build-2033171-47778/root/chroot_tmpdir/scmroot/R-rprojroot'...
$ git fetch origin 03eb4cd82e8e7128296f63cf225c445f605870bd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-rprojroot
 * [new ref]         03eb4cd82e8e7128296f63cf225c445f605870bd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 03eb4cd 2.0.4