$ git clone -n https://src.fedoraproject.org/rpms/rust-pyo3_0.19.git /var/lib/mock/f40-build-2649295-66837/root/chroot_tmpdir/scmroot/rust-pyo3_0.19
Cloning into '/var/lib/mock/f40-build-2649295-66837/root/chroot_tmpdir/scmroot/rust-pyo3_0.19'...
$ git fetch origin 1644d8567ede4e32b1e86e515b594c1c0a5743be:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pyo3_0.19
 * [new ref]         1644d8567ede4e32b1e86e515b594c1c0a5743be -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1644d85 Skip a doctest that does not compile with Rust 1.74+