bytemark/bin/custodian-instances


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#!/usr/bin/ruby1.8
#
#  Add/Remove/List custodian workers
#
# Steve
# --


require 'etc'
require 'fileutils'
require 'getoptlong'


#
#  A single worker instance.
#
class CustodianWorker

  attr_reader :path

  #
  # Constructor.
  #
  # Called with the path to a service directory.
  #
  def initialize( path )
    @path = path
  end


  #
  #  Does the service directory look like a worker?
  #
  def is_worker?

    # the directory must exist.
    return false unless( File.directory?( @path ) )

    # There should be a ./run file in the directory.
    return false unless( File.executable?( "#{@path}/run" ) )

    # The run-file should invoke custodian-dequeue.
    contents = read_file( "#{@path}/run" )
    if ( contents !~ /exec su - ([\S]+)(.*)exec custodian-dequeue/ )
      return false
    end

    # The name must be custodian-$LOGIN
    if ( @path =~ /custodian-([.*])$/ )
      user = $1.dup

      data = Etc.getpwnam( user )
      return false unless( data.name )
      return false unless( File.directory?( data.dir ) )
    end
    true
  end


  #
  #  Create a new worker-service.
  #
  def CustodianWorker.create( login )

    #
    #  Does the service directory already exist?
    #
    sv =  "/etc/service/custodian-#{login}"
    if ( File.directory?( sv ) )
      puts "Target already exists: #{sv}"
      exit( 1 )
    end

    #
    #  Does the user exist?
    #
    begin
      data = Etc.getpwnam( login )
      if ( login.name )
        puts "Unix user already exists: #{login}"
        exit( 1 )
      end
    rescue => ex
    end

    #
    #  Create the directory
    #
    FileUtils.mkdir_p( sv )

    #
    #  Add the unix user.
    #
    system( "useradd --create-home #{login}" )

    #
    #  Create the run-script.
    #
    File.open( "#{sv}/run", "w" ) do |fh|
      fh.puts <<EOF
#!/bin/sh
exec su - #{login} -c "exec custodian-dequeue --verbose"
EOF
    end

    File.chmod( 0755, "#{sv}/run" )
  end


  #
  # Delete an existing worker service.
  #
  def CustodianWorker.delete( login )

    #
    #  Stop the service
    #
    sv =  "/etc/service/custodian-#{login}"
    if ( File.directory?( sv ) )
      puts "Stopping service: #{sv}"
      system( "sv down #{sv}" )
    end

    #
    #  Delete the user
    #
    begin
      data = Etc.getpwnam( login )
      if ( data.name )
        system( "userdel #{login}" )
        if ( ( File.directory?( data.dir ) ) && ( data.dir == "/home/#{login}" ) )
          puts "Removing home directory"
          system( "rm -rf #{data.dir}" )
        end
      end
    rescue => ex
       puts "WARNING: Login not found #{login}"
    end

    #
    #  Remove the service
    #
    if ( File.directory?( sv ) )
        puts "Removing service"
        system( "rm -rf #{sv}" )
    end
  end


  #
  # Return a string containing the given file contents.
  #
  def read_file( fname )
    lines = File.open( fname, 'r') {|file| file.readlines.collect}
    lines.join( "\n" )
  end


end


#
#  Get access to custodian services
#
class CustodianServices

  #
  # The name for this instance.
  #
  attr_reader :prefix

  #
  # Constructor
  #
  def initialize( prefix = "/etc/service" )
    @prefix = prefix
  end

  #
  #  Return an array of all services which are custodian-workers
  #
  def get
    a = Array.new()

    Dir.entries( @prefix ).sort_by{|s| s.scan(/\d+/).map{|s| s.to_i}}.each do |name|
      tmp = CustodianWorker.new( "#{@prefix}/#{name}" )
      a.push( tmp ) if ( tmp.is_worker? )
    end

    a
  end

end


if __FILE__ == $0 then


  arg = ARGV.shift || "list";

  case arg
  when "list"
    helper = CustodianServices.new();
    helper.get().each do |f|
      puts f.path
    end
  when "add"
    name = ARGV.shift || nil
    if ( name.nil? )
      puts "Usage: $0 add NAME"
      exit 1
    end
    f = CustodianWorker.create( name )
  when "delete"
    name = ARGV.shift || nil
    if ( name.nil? )
      puts "Usage: $0 delete NAME"
      exit 1
    end
    f = CustodianWorker.delete( name )
  else
    puts "Unknown argument.  Usage $0 [add|delete|list]"
  end
end