postinst is in libpam-modules 1.1.3-7ubuntu2.3.
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 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | #!/bin/sh -e
# If the user has removed the config file, respect this sign of dementia
# -- only create on package install.
if [ -z "$2" ] || dpkg --compare-versions "$2" lt 0.99.7.1-3
then
if ! [ -f /etc/security/opasswd ]; then
umask 066
touch /etc/security/opasswd
umask 022
fi
fi
if dpkg --compare-versions "$2" lt 0.99.9.0-1 && ! [ -f /etc/environment ]
then
touch /etc/environment
fi
# Add PATH to /etc/environment if it's not present there or in
# /etc/security/pam_env.conf
if [ "$1" = "configure" ] && (dpkg --compare-versions 0.79-3ubuntu6 ge "$2" || [ "$2" = "" ]); then
if ! grep -qs ^PATH /etc/security/pam_env.conf; then
if ! grep -qs ^PATH /etc/environment; then
echo 'PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games"' >> /etc/environment
fi
fi
fi
if dpkg --compare-versions "$2" lt-nl 1.1.2-1 \
&& grep -q 'pam_unix.*\bmin=[0-9]\+' /etc/pam.d/common-password
then
echo "'min=' option to pam_unix is obsolete."
echo "replacing with 'minlen=' in /etc/pam.d/common-password."
sed -i -e'/pam_unix/ s/\bmin=/minlen=/' /etc/pam.d/common-password
fi
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