$ git clone -n https://src.fedoraproject.org/rpms/rust-maybe-rayon.git /var/lib/mock/f38-build-side-43-rust-devel-1411588-31436/root/chroot_tmpdir/scmroot/rust-maybe-rayon
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1411588-31436/root/chroot_tmpdir/scmroot/rust-maybe-rayon'...
$ git fetch origin 73c578d9aa414031fe8fc01f5b00d0b080bfc7c8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-maybe-rayon
 * [new ref]         73c578d9aa414031fe8fc01f5b00d0b080bfc7c8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 73c578d Initial import (#2217973)