$ git clone -n https://src.fedoraproject.org/rpms/rshim.git /var/lib/mock/f40-build-2033274-47785/root/chroot_tmpdir/scmroot/rshim
Cloning into '/var/lib/mock/f40-build-2033274-47785/root/chroot_tmpdir/scmroot/rshim'...
$ git fetch origin 2b4c1feb808e4d26abb4ffb13e10547cf0a3ca09:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rshim
 * [new ref]         2b4c1feb808e4d26abb4ffb13e10547cf0a3ca09 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2b4c1fe Update to upstream version 2.0.17