$ git clone -n https://src.fedoraproject.org/rpms/rust-pyo3-ffi0.20.git /var/lib/mock/f42-build-3403739-45135/root/chroot_tmpdir/scmroot/rust-pyo3-ffi0.20
Cloning into '/var/lib/mock/f42-build-3403739-45135/root/chroot_tmpdir/scmroot/rust-pyo3-ffi0.20'...
$ git fetch origin e5bfdbd4441b777efb63a49c5d1d8095e2f1cbb4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pyo3-ffi0.20
 * [new ref]         e5bfdbd4441b777efb63a49c5d1d8095e2f1cbb4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e5bfdbd compat package for obsolete version