postinst is in libnss-myhostname 237-3ubuntu10.
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 | #!/bin/sh
set -e
# This code was taken from libnss-myhostname
# try to insert myhostname entries to the "hosts" line in /etc/nsswitch.conf to
# automatically enable libnss-myhostname support; do not change the
# configuration if the "hosts" line already references some myhostname lookups
insert_nss_entry() {
echo "Checking NSS setup..."
# abort if /etc/nsswitch.conf does not exist
if ! [ -e /etc/nsswitch.conf ]; then
echo "Could not find /etc/nsswitch.conf."
return
fi
perl -i -pe '
sub insert {
my $line = shift;
# this also splits on tab
my @bits=split(" ", $line);
# do not break configuration if the "hosts" line already references
# myhostname
if (grep { $_ eq "myhostname"} @bits) {
return $line;
}
# add myhostname at the end
return $line . " myhostname";
}
s/^(hosts:\s+)(.*)/$1.insert($2)/e;
' /etc/nsswitch.conf
}
if [ "$1" = configure ] && [ -z "$2" ]; then
echo "First installation detected..."
# first install: setup the recommended configuration (unless
# nsswitch.conf already contains myhostname entries)
insert_nss_entry
fi
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