$ git clone -n https://src.fedoraproject.org/rpms/rust-pyo3.git /var/lib/mock/f40-build-1072760-19731/root/chroot_tmpdir/scmroot/rust-pyo3
Cloning into '/var/lib/mock/f40-build-1072760-19731/root/chroot_tmpdir/scmroot/rust-pyo3'...
$ git fetch origin 3d88625d62febef8bcca1916c540cd3acda184da:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pyo3
 * [new ref]         3d88625d62febef8bcca1916c540cd3acda184da -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3d88625 Update to version 0.21.2; Fixes RHBZ#2275246