$ git clone -n https://src.fedoraproject.org/rpms/rust-rd-agent.git /var/lib/mock/f40-build-1072807-19731/root/chroot_tmpdir/scmroot/rust-rd-agent
Cloning into '/var/lib/mock/f40-build-1072807-19731/root/chroot_tmpdir/scmroot/rust-rd-agent'...
$ git fetch origin d2b07b02d49e1c45f2881a5497862068154994e9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rd-agent
 * [new ref]         d2b07b02d49e1c45f2881a5497862068154994e9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d2b07b0 Rebuild with Rust 1.78 to fix incomplete debuginfo and backtraces