$ git clone -n https://src.fedoraproject.org/rpms/clang16.git /var/lib/mock/f39-build-1663097-40668/root/chroot_tmpdir/scmroot/clang16
Cloning into '/var/lib/mock/f39-build-1663097-40668/root/chroot_tmpdir/scmroot/clang16'...
$ git fetch origin 957ea5d1d0dbc5c02e4eb3ed2b84a5a758c0fc7c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/clang16
 * [new ref]         957ea5d1d0dbc5c02e4eb3ed2b84a5a758c0fc7c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 957ea5d Import clang16