$ git clone -n https://src.fedoraproject.org/rpms/llvm13.git /var/lib/mock/f41-build-side-1-2959920-35691/root/chroot_tmpdir/scmroot/llvm13
Cloning into '/var/lib/mock/f41-build-side-1-2959920-35691/root/chroot_tmpdir/scmroot/llvm13'...
$ git fetch origin 679b61fc0338d9af5958df6c76103df62cd9b3c2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/llvm13
 * [new ref]         679b61fc0338d9af5958df6c76103df62cd9b3c2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 679b61f fix go binding test: replace removed python pipes use with shlex