preinst is in php5-fpm 5.4.45-0+deb7u2.
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 5 6 7 8 9 | #!/bin/sh
set -e
dpkg-maintscript-helper mv_conffile /etc/php5/fpm/main.conf /etc/php5/fpm/php-fpm.conf 5.3.5-1 -- "$@"
exit 0
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