$ git clone -n https://src.fedoraproject.org/rpms/rust-toml0.4.git /var/lib/mock/f41-build-side-1-2897343-34638/root/chroot_tmpdir/scmroot/rust-toml0.4
Cloning into '/var/lib/mock/f41-build-side-1-2897343-34638/root/chroot_tmpdir/scmroot/rust-toml0.4'...
$ git fetch origin 3fb779bda0c48aa181bb0f41783f8865d71694fb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-toml0.4
 * [new ref]         3fb779bda0c48aa181bb0f41783f8865d71694fb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3fb779b compat package no longer needed