postinst is in initramfs-tools 0.120+deb8u3.
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 10 11 12 13 14 15 16 17 | #!/bin/sh
set -e
if [ ! -e /etc/initramfs-tools/modules ]; then
sed '/^###/d' /usr/share/initramfs-tools/modules \
> /etc/initramfs-tools/modules
fi
# Regenerate initramfs whenever we go to dpkg state `installed'
if [ "x$1" != xtriggered ]; then
# this activates the trigger, if triggers are working
update-initramfs -u
else
# force it to actually happen
DPKG_MAINTSCRIPT_PACKAGE='' update-initramfs -u
fi
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