postinst is in puppet-module-puppetlabs-inifile 2.2.0-1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 | #!/bin/sh
set -e
update-alternatives --install /usr/share/puppet/modules/inifile puppet-module-inifile /usr/share/puppet/modules.available/puppetlabs-inifile 500
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