$ git clone -n https://src.fedoraproject.org/rpms/llvm11.git /var/lib/mock/f41-build-859615-168699/root/chroot_tmpdir/scmroot/llvm11
Cloning into '/var/lib/mock/f41-build-859615-168699/root/chroot_tmpdir/scmroot/llvm11'...
$ git fetch origin 3d5e56984b01256f7f3243d88af3670c963fd451:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/llvm11
 * [new ref]         3d5e56984b01256f7f3243d88af3670c963fd451 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3d5e569 fix go binding test: replace removed python pipes use with shlex