/usr/share/postgresql/10/extension/citus--6.0-1--6.0-2.sql is in postgresql-10-citus 7.0.3.PGDG-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | /* citus--6.0-1--6.0-2.sql */
CREATE FUNCTION pg_catalog.shard_name(object_name regclass, shard_id bigint)
RETURNS text
LANGUAGE C STABLE
AS 'MODULE_PATHNAME', $$shard_name$$;
COMMENT ON FUNCTION pg_catalog.shard_name(object_name regclass, shard_id bigint)
IS 'returns shard-extended version of object name';
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