$ git clone -n https://src.fedoraproject.org/rpms/rust-pyo3.git /var/lib/mock/f39-build-2182738-51243/root/chroot_tmpdir/scmroot/rust-pyo3
Cloning into '/var/lib/mock/f39-build-2182738-51243/root/chroot_tmpdir/scmroot/rust-pyo3'...
$ git fetch origin 35b4d5bc17feb54726f25e8bb48b2f0735a91503:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pyo3
 * [new ref]         35b4d5bc17feb54726f25e8bb48b2f0735a91503 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 35b4d5b Update to version 0.20.1; Fixes RHBZ#2256286