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

Inherits:
Base
  • Object
show all
Includes:
OsCtl::Lib::Utils::Log, OsCtl::Lib::Utils::System
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!, #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

#check_abort!(pool) ⇒ Object (protected) 



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# File 'lib/osctld/commands/pool/export.rb', line 175

def check_abort!(pool)
  error!('pool export aborted') if check_abort?(pool)
end

#check_abort?(pool) ⇒ Boolean (protected)

Returns:

  • (Boolean) 


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# File 'lib/osctld/commands/pool/export.rb', line 179

def check_abort?(pool)
  pool.abort_export? || (indirect? && Daemon.get.abort_shutdown?)
end

#execute ⇒ Object 



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# File 'lib/osctld/commands/pool/export.rb', line 10

def execute
  pool = DB::Pools.find(opts[:name])

  unless pool
    if opts[:if_imported]
      progress('pool not imported')
      return ok
    else
      error!('pool not imported')
    end
  end

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

  begin
    Hook.run(pool, :pre_export)
  rescue HookFailed => e
    error!("pre-export hook failed: #{e.message}")
  end

  manipulate(pool) do
    pool.begin_export

    # Do not autostart any more containers
    pool.begin_stop
    check_abort!(pool)

    # Disable the pool
    pool.exclusively { pool.disable }
    check_abort!(pool)

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

    # Stop all containers
    if opts[:stop_containers]
      progress('Stopping all containers')
      pool.autostop_and_wait(client_handler:, message: opts[:message])
      check_abort!(pool)

      # Verify that all containers are stopped
      loop do
        all_stopped = true

        DB::Containers.get.each do |ct|
          next if ct.pool != pool

          next if %i[staged stopped].include?(ct.state)

          msg = "Container #{ct.ident} is still #{ct.state}, waiting until stopped"
          progress(msg)
          log(:warn, msg)
          all_stopped = false
        end

        check_abort!(pool)
        break if all_stopped

        check_abort!(pool)
        sleep(1)
      end
    end

    # Stop also autostop
    pool.all_stop

    # 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,
      DB::IdRanges
    ].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) }

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

            # When a user with the same name is going to be imported again,
            # he may have a different ugid than before. All files in his
            # directory would then have an incorrect owner.
            syscmd("rm -rf \"#{obj.userdir}\"")
          end

        elsif obj.is_a?(Container)
          obj.unregister
          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 & BPF
    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

      # Clear-out BPF FS
      BpfFs.remove_pool(pool.name)
    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)

    # Remove outdated send/receive keys
    SendReceive.deploy
  end

  Hook.run(pool, :post_export)
  ok
end

#grab_cts(pool) ⇒ Object (protected) 



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# File 'lib/osctld/commands/pool/export.rb', line 156

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

  loop do
    cts.delete_if do |ct|
      ct.acquire_manipulation_lock(self)
      true
    rescue ResourceLocked => e
      progress(e.message)
      false
    end

    break if cts.empty?

    sleep(1)
  end
end