/usr/share/click/hooks/content-hub.hook is in content-hub 0.1+16.04.20160309-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | Pattern: ${home}/.local/share/content-hub/${id}
Exec: /usr/lib/x86_64-linux-gnu/content-hub/content-hub-peer-hook-wrapper
User-Level: yes
Hook-Name: content-hub
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