$ git clone -n https://src.fedoraproject.org/rpms/rpy.git /var/lib/mock/f38-build-722986-98962/root/chroot_tmpdir/scmroot/rpy
Cloning into '/var/lib/mock/f38-build-722986-98962/root/chroot_tmpdir/scmroot/rpy'...
$ git fetch origin 27eb85a2e194e77cd4880b74883ca14646fbfbab:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rpy
 * [new ref]         27eb85a2e194e77cd4880b74883ca14646fbfbab -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 27eb85a Bump rmin