$ git clone -n https://src.fedoraproject.org/rpms/rust-uu_env.git /var/lib/mock/f41-build-810799-146951/root/chroot_tmpdir/scmroot/rust-uu_env
Cloning into '/var/lib/mock/f41-build-810799-146951/root/chroot_tmpdir/scmroot/rust-uu_env'...
$ git fetch origin 2d68107c587f4d7aa7a3ed72f105b6cc1ef1f32c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uu_env
 * [new ref]         2d68107c587f4d7aa7a3ed72f105b6cc1ef1f32c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2d68107 Rebuild with Rust 1.78 to fix incomplete debuginfo and backtraces