$ git clone -n https://src.fedoraproject.org/rpms/shim-unsigned-aarch64.git /var/lib/mock/f38-build-side-42-init-devel-709133-27226/root/chroot_tmpdir/scmroot/shim-unsigned-aarch64
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-709133-27226/root/chroot_tmpdir/scmroot/shim-unsigned-aarch64'...
$ git fetch origin 06f4cfa5b89dfb78d6a6ae2b1366eddfcb40478c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/shim-unsigned-aarch64
 * [new ref]         06f4cfa5b89dfb78d6a6ae2b1366eddfcb40478c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 06f4cfa Add pjones's aarch64 relocation fix