$ git clone -n https://src.fedoraproject.org/rpms/rust.git /var/lib/mock/f40-build-1981788-25246/root/chroot_tmpdir/scmroot/rust
Cloning into '/var/lib/mock/f40-build-1981788-25246/root/chroot_tmpdir/scmroot/rust'...
$ git fetch origin 8814c5339738e7498dbdc35ffe1e858dc8215cea:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust
 * [new ref]         8814c5339738e7498dbdc35ffe1e858dc8215cea -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8814c53 Update to Rust 1.80.0