$ git clone -n https://github.com/fedora-riscv/llvm.git /var/lib/mock/f40-build-2566947-62192/root/chroot_tmpdir/scmroot/llvm
Cloning into '/var/lib/mock/f40-build-2566947-62192/root/chroot_tmpdir/scmroot/llvm'...
$ git fetch origin 3ded0b862650bd622cf4c40460f9cf56171fd08d:KOJI_FETCH_HEAD
From https://github.com/fedora-riscv/llvm
 * [new ref]         3ded0b862650bd622cf4c40460f9cf56171fd08d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3ded0b8 Add support for riscv64