This file is indexed.

postinst is in initramfs-tools-ubuntu-core 0.7.45.

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.

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#!/bin/sh

set -e

apply_diversions()
{
        DIR=/usr/share/initramfs-tools
        SUBDIRS="hooks scripts/local-premount scripts/init-top scripts/init-bottom scripts/panic"
        FILES="compcache dmsetup plymouth console_setup kbd thermal"

        for file in $FILES; do
                for subdir in $SUBDIRS; do
                        if [ -e $DIR/$subdir/$file ]; then
                                diversion="$file.$(echo $subdir|sed -e 's/scripts\///'|sed -e 's/-/./').diverted"
                                dpkg-divert --add --local --divert $DIR/$diversion --rename $DIR/$subdir/$file >/dev/null 2>&1 || true
                        fi
                done
        done
}

if [ "$1" = "configure" ]; then
        # move bits out of the way that make our initrd to big
        apply_diversions
fi