$ git clone -n https://src.fedoraproject.org/rpms/rust-pyo3.git /var/lib/mock/f39-build-2144080-50859/root/chroot_tmpdir/scmroot/rust-pyo3
Cloning into '/var/lib/mock/f39-build-2144080-50859/root/chroot_tmpdir/scmroot/rust-pyo3'...
$ git fetch origin 1fca351d033a547115d8b51c4bf0d3529ceefed2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pyo3
 * [new ref]         1fca351d033a547115d8b51c4bf0d3529ceefed2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1fca351 Update to version 0.20.0; Fixes RHBZ#2243412