$ git clone -n https://src.fedoraproject.org/rpms/rust-binfmt-dispatcher.git /var/lib/mock/f42-build-side-1-3589290-46956/root/chroot_tmpdir/scmroot/rust-binfmt-dispatcher
Cloning into '/var/lib/mock/f42-build-side-1-3589290-46956/root/chroot_tmpdir/scmroot/rust-binfmt-dispatcher'...
$ git fetch origin df5fdd35c359c931d90eaec6db49bfd2cc92d3a9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-binfmt-dispatcher
 * [new ref]         df5fdd35c359c931d90eaec6db49bfd2cc92d3a9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at df5fdd3 Update to 0.1.2