print conflicting user account info when nsswitch uses multiple sources, such as local and ldap

conflicts.rb

#!/usr/bin/env ruby
# vim: set ts=2 sw=2 ai et bg=dark:

class Record < Struct.new(:name, :uid, :gid, :dir)
end

records = Array.new
%x!getent passwd!.split("\n").each do |record|
  fields = record.split(':')
  records << Record.new(
    fields[0], # name
    fields[2], # uid
    fields[3], # gid
    fields[5]  # homedir
  )
end

users = Hash.new
records.each do |record|
  if user = users[record.name]
    user[:uids] << record.uid unless user[:uids].include?(record.uid)
    user[:gids] << record.gid unless user[:gids].include?(record.gid)
    user[:dirs] << record.dir unless user[:dirs].include?(record.dir)
  else
    users[record.name] = {
      :uids => [record.uid],
      :gids => [record.gid],
      :dirs => [record.dir],
    }
  end
end

users.each do |name, hash|
  puts "#{name} uids => #{hash[:uids].join(',')}" if hash[:uids].length > 1
  puts "#{name} gids => #{hash[:gids].join(',')}" if hash[:gids].length > 1
  puts "#{name} dirs => #{hash[:dirs].join(',')}" if hash[:dirs].length > 1
end