$ git clone -n http://fedora.riscv.rocks:3000/rpms/llvm.git /var/lib/mock/f40-build-735568-106476/root/chroot_tmpdir/scmroot/llvm
Cloning into '/var/lib/mock/f40-build-735568-106476/root/chroot_tmpdir/scmroot/llvm'...
$ git fetch origin 3867a191df83e8d7397b2d8ee223110b23bb6439:KOJI_FETCH_HEAD
From http://fedora.riscv.rocks:3000/rpms/llvm
 * [new ref]         3867a191df83e8d7397b2d8ee223110b23bb6439 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3867a19 Rebuild with Clang toolchain