$ git clone -n https://src.fedoraproject.org/rpms/rust-joinery.git /var/lib/mock/f45-build-42724-796/root/chroot_tmpdir/scmroot/rust-joinery
Cloning into '/var/lib/mock/f45-build-42724-796/root/chroot_tmpdir/scmroot/rust-joinery'...
$ git fetch origin 8997891dafa51264a0eccdb10e258894d90aa6de:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-joinery
 * [new ref]         8997891dafa51264a0eccdb10e258894d90aa6de -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8997891 Regenerate with rust2rpm v28