$ git clone -n https://git.cclinux.org/stage/rpms/shim-unsigned-x64.git /var/lib/mock/dist-circle8-build-118305-81093/root/chroot_tmpdir/scmroot/shim-unsigned-x64
Cloning into '/var/lib/mock/dist-circle8-build-118305-81093/root/chroot_tmpdir/scmroot/shim-unsigned-x64'...
$ git fetch origin a349e0f71d1c1293e04e2677770c9736d6fa1577:KOJI_FETCH_HEAD
From https://git.cclinux.org/stage/rpms/shim-unsigned-x64
 * [new ref]         a349e0f71d1c1293e04e2677770c9736d6fa1577 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a349e0f import shim-unsigned-x64-15.8-2.el8