postinst is in libpam-runtime 1.1.8-3.2ubuntu2.
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 37 38 39 40 41 42 43 | #!/bin/sh -e
. /usr/share/debconf/confmodule
calculate_md5sum()
{
configfile="$1"
sed -n -e'1,/# here are the per-package modules (the "Primary" block)/p;
/# here.s the fallback if no module succeeds/,/# and here are more per-package modules (the "Additional" block)/p;
/# end of pam-auth-update config/,$p' \
/etc/pam.d/"$configfile" | md5sum | awk '{ print $1 }'
}
# If the user has removed the config file, respect this sign of dementia
# -- only create on package install.
force=
if [ -z "$2" ] || dpkg --compare-versions "$2" lt 1.0.1-11
then
force=--force
for configfile in common-auth common-account common-session \
common-password
do
if [ -f /etc/pam.d/$configfile ] && \
! fgrep -q $(calculate_md5sum $configfile) \
/usr/share/pam/$configfile.md5sums 2>/dev/null
then
force=
fi
done
fi
pam-auth-update --package $force
if [ -n "$force" ]; then
rm -f /etc/pam.d/common-auth.pam-old \
/etc/pam.d/common-account.pam-old \
/etc/pam.d/common-password.pam-old \
/etc/pam.d/common-session.pam-old
elif dpkg --compare-versions "$2" lt-nl 1.1.0-1 \
&& [ ! -e /etc/pam.d/common-session-noninteractive ]
then
cp -a /etc/pam.d/common-session /etc/pam.d/common-session-noninteractive
fi
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