$ git clone -n https://github.com/fedora-riscv/clang12.git /var/lib/mock/f38-build-side-42-init-devel-998336-29142/root/chroot_tmpdir/scmroot/clang12
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-998336-29142/root/chroot_tmpdir/scmroot/clang12'...
$ git fetch origin ad9388ac03c2478d962bfc0d1491faa49747c565:KOJI_FETCH_HEAD
error: RPC failed; curl 16 Error in the HTTP2 framing layer
fatal: expected flush after ref listing
$ git reset --hard ad9388ac03c2478d962bfc0d1491faa49747c565
HEAD is now at ad9388a Fix build on riscv64.