/usr/share/postgresql/10/extension/pglogical--2.0.1--2.1.0.sql is in postgresql-10-pglogical 2.1.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | CREATE FUNCTION
pglogical.wait_slot_confirm_lsn(slotname name, target pg_lsn)
RETURNS void LANGUAGE c AS 'pglogical','pglogical_wait_slot_confirm_lsn';
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