$ git clone -n https://src.fedoraproject.org/rpms/rust-bootupd.git /var/lib/mock/f38-build-side-43-rust-devel-1417061-31458/root/chroot_tmpdir/scmroot/rust-bootupd
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1417061-31458/root/chroot_tmpdir/scmroot/rust-bootupd'...
$ git fetch origin 8ad91809cc1e9797d681c09229e8b67efde75be0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-bootupd
 * [new ref]         8ad91809cc1e9797d681c09229e8b67efde75be0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8ad9180 https://github.com/coreos/bootupd/releases/tag/v0.2.11