#!/bin/sh
set -e



# This code was taken from libnss-myhostname, which got it from nss-mdns:

log() {
    echo "$*"
}

# try to insert sss entries to the passwd, group, shadow and netgroup
# lines in /etc/nsswitch.conf to automatically enable libnss-sss
# support; do not change the configuration if the lines already
# references some sss lookups
insert_nss_entry() {
    log "Checking NSS setup..."
    # abort if /etc/nsswitch.conf does not exist
    if ! [ -e /etc/nsswitch.conf ]; then
        log "Could not find /etc/nsswitch.conf."
        return
    fi
    # append 'sss' to the end of the line if it's not found already
    sed -i --regexp-extended '
      /^(passwd|group|shadow|netgroup|services|automounter):/ {
        /\bsss\b/! s/$/ sss/
      }
    ' /etc/nsswitch.conf
    # and add a new entry for automount if it's not there
    if ! grep -q automount /etc/nsswitch.conf; then
        log "Adding an entry for automount."
        echo "automount:      sss" >> /etc/nsswitch.conf
    fi
}

action="$1"

if [ configure = "$action" ]; then
    if [ -z "$2" ]; then
        log "First installation detected..."
        # first install: setup the recommended configuration (unless
        # nsswitch.conf already contains sss entries)
        insert_nss_entry
    else
        # upgrade
        version="$2"

        # fix automount typo
	if dpkg --compare-versions $version lt "2.2.3-3"; then
            sed -i 's/automounter/automount/' /etc/nsswitch.conf
        fi
    fi
fi