This file is indexed.

postinst is in bootcd-mkinitramfs 3.27.

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

# Regenerate initramfs on upgrade
if [ "$1" = "configure" ]; then

  # We now install config to /usr/share/initramfs-tools instead of
  # /etc/initramfs-tools. This means we have to cleanup. 
  # Do not forget .dpkg-old files.
  D=/etc/initramfs-tools
  for i in \
    $(find $D/hooks -name "bootcdinitramfshook*")  \
    $(find $D/scripts/init-top -name "runbootcdmodprobe*") \
    $(find $D/scripts/init-premount/ -name "runbootcdproberoot*")
  do
    mkdir -p /etc/bootcd/initramfs-tools.oldconfig
    mv $i /etc/bootcd/initramfs-tools.oldconfig
  done

  update-initramfs -u
fi