$ git clone -n https://github.com/fedora-riscv/llvm12.git /var/lib/mock/f38-build-side-42-init-devel-634663-26381/root/chroot_tmpdir/scmroot/llvm12
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-634663-26381/root/chroot_tmpdir/scmroot/llvm12'...
$ git fetch origin 19cbdbbb343b7dff02cc08670fe0ba8219ba2a57:KOJI_FETCH_HEAD
fatal: unable to access 'https://github.com/fedora-riscv/llvm12.git/': HTTP/2 stream 1 was not closed cleanly before end of the underlying stream
$ git reset --hard 19cbdbbb343b7dff02cc08670fe0ba8219ba2a57
HEAD is now at 19cbdbb Add riscv64.