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Edit File: libnss-systemd:amd64.postinst

#!/bin/sh

set -e

# try to insert the systemd entry to the "passwd" and "group" lines in
# /etc/nsswitch.conf to automatically enable libnss-systemd support; do not
# change the configuration if the lines already contain "systemd"
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 line already references
            # systemd
            if (grep { $_ eq "systemd"} @bits) {
                return $line;
            }
            # add systemd at the end
            return $line . " systemd";
        }
        s/^(passwd:\s+)(.*)/$1.insert($2)/e;
        s/^(group:\s+)(.*)/$1.insert($2)/e;
    ' /etc/nsswitch.conf
}

if [ "$1" = configure ] && [ -z "$2" ]; then
    echo "First installation detected..."
    # first install: setup the recommended configuration
    insert_nss_entry
fi