Class: OsCtld::Commands::Pool::Export

Inherits:
Base
  • Object
show all
Defined in:
lib/osctld/commands/pool/export.rb

Instance Attribute Summary

Attributes inherited from Base

#client, #client_handler, #id, #opts

Instance Method Summary collapse

Methods inherited from Base

#base_execute, #call_cmd, #call_cmd!, cmd, #error, #error!, handle, #handled, #indirect?, #initialize, #manipulate, #manipulation_holder, #ok, #progress, #request_stop, run, run!

Constructor Details

This class inherits a constructor from OsCtld::Commands::Base

Instance Method Details

#execute ⇒ Object 



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# File 'lib/osctld/commands/pool/export.rb', line 8

def execute
  pool = DB::Pools.find(opts[:name])
  error!('pool not imported') unless pool

  # Check for running containers
  if !opts[:force] && DB::Containers.get.detect { |ct| ct.pool == pool && ct.running? }
    error!('the pool has running containers')
  end

  manipulate(pool) do
    # Do not autostart any more containers
    pool.stop

    # Disable the pool
    pool.exclusively { pool.disable }

    # Grab manipulation locks of all containers
    grab_cts(pool) unless opts[:grab_containers] === false

    # Stop all containers
    if opts[:stop_containers]
      progress('Stopping all containers')
      stop_cts(pool)
    end

    # Unregister all entities
    progress('Unregistering users, groups and containers')

    # Preserve root group
    root_group = DB::Groups.root(pool)

    [DB::Containers, DB::Users, DB::Groups, DB::Repositories].each do |klass|
      klass.get.each do |obj|
        next if obj.pool != pool

        if obj.is_a?(User)
          obj.exclusively { UserControl::Supervisor.stop_server(obj) }

          call_cmd!(
            Commands::User::Unregister,
            pool: pool.name,
            name: obj.name
          ) if opts[:unregister_users]

        elsif obj.is_a?(Container)
          Monitor::Master.demonitor(obj)
          Console.remove(obj)
        end

        klass.remove(obj)
        obj.release_manipulation_lock if obj.is_a?(Container)
      end
    end

    # Remove all cgroups
    if opts[:stop_containers]
      progress('Removing cgroups')
      begin
        CGroup.rmpath_all(root_group.cgroup_path)
      rescue SystemCallError
        # If some of the cgroups are busy, just leave them be
      end
    end

    # Regenerate /etc/sub{u,g}ids and lxc-usernet
    call_cmd!(Commands::User::SubUGIds)
    call_cmd!(Commands::User::LxcUsernet)

    # Close history
    History.close(pool)

    # Remove pool from the database
    DB::Pools.remove(pool)

    ok
  end
end

#grab_cts(pool) ⇒ Object (protected) 



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# File 'lib/osctld/commands/pool/export.rb', line 87

def grab_cts(pool)
  progress('Grabbing all containers')
  cts = DB::Containers.get.select { |ct| ct.pool == pool }

  loop do
    cts.delete_if do |ct|
      begin
        ct.acquire_manipulation_lock(self)
        true

      rescue ResourceLocked => e
        progress(e.message)
        false
      end
    end

    break if cts.empty?
    sleep(1)
  end
end

#stop_cts(pool) ⇒ Object (protected) 



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# File 'lib/osctld/commands/pool/export.rb', line 108

def stop_cts(pool)
  # Sort containers by reversed autostart priority -- containers with
  # the lowest priority are stopped first
  cts = DB::Containers.get.select { |ct| ct.pool == pool }
  cts.sort! do |a, b|
    if a.autostart && b.autostart
      a.autostart <=> b.autostart

    elsif a.autostart
      -1

    elsif b.autostart
      1

    else
      0
    end
  end
  cts.reverse!

  total = cts.count
  done = 0
  mutex = Mutex.new

  plan = ExecutionPlan.new
  cts.each { |ct| plan << ct }

  plan.run(pool.parallel_stop) do |ct|
    mutex.synchronize do
      done += 1
      progress(
        "[#{done}/#{total}] "+
        (ct.ephemeral? ? 'Deleting ephemeral container' : 'Stopping container')+
        " #{ct.ident}"
      )
    end

    if ct.ephemeral?
      call_cmd!(
        Commands::Container::Delete,
        pool: pool.name,
        id: ct.id,
        force: true,
        progress: false,
        manipulation_lock: 'ignore',
      )
    else
      call_cmd!(
        Commands::Container::Stop,
        pool: pool.name,
        id: ct.id,
        progress: false,
        manipulation_lock: 'ignore',
      )
    end
  end

  plan.wait
end