Class: Xen::Slice

Inherits:
Object
  • Object
show all
Defined in:
lib/xen/slice.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ Slice

Returns a new instance of Slice.



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# File 'lib/xen/slice.rb', line 19

def initialize(*args)
  options = args.extract_options! 
  @name = options[:name]
  @config_file = options[:config_file]
  @instance = options[:instance]
  @instance_cache_expires = Time.now
  @backups = Array(options[:backups])
end

Instance Attribute Details

#backups ⇒ Object

Returns the value of attribute backups.



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# File 'lib/xen/slice.rb', line 3

def backups
  @backups
end

#config_file ⇒ Object

XXX We’re assuming other processes aren’t going to edit config_files This is reasonable in simple cases.



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# File 'lib/xen/slice.rb', line 78

def config_file
  @config_file
end

#image ⇒ Object

Returns the value of attribute image.



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# File 'lib/xen/slice.rb', line 3

def image
  @image
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/xen/slice.rb', line 3

def name
  @name
end

Class Method Details

.all(options = {}) ⇒ Object 



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# File 'lib/xen/slice.rb', line 15

def self.all(options={})
  self.find(:all, options)
end

.find(*args) ⇒ Object 



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# File 'lib/xen/slice.rb', line 5

def self.find(*args)
  options = args.extract_options!
  case args.first
    when :all       then Xen::ConfigFile.find(:all, options).collect { |config_file| new :name => config_file.name }
    when :running   then Xen::Instance.find(:all, options).collect { |instance| new :name => instance.name }
    # Retrieve a Slice by name
    else            Xen::ConfigFile.find_by_name(args.first) && new(:name => args.first)
  end
end

Instance Method Details

#config_file_newer_than_instance? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/xen/slice.rb', line 112

def config_file_newer_than_instance?
  instance && config_file.updated_at > instance.start_time 
end

#create_backup(options = {}) ⇒ Object 



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# File 'lib/xen/slice.rb', line 86

def create_backup(options = {})
  Xen::Backup.create(name, :options)
end

#create_image(*args) ⇒ Object 



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# File 'lib/xen/slice.rb', line 28

def create_image(*args)
  options = args.extract_options!.stringify_keys
  
  # Load default values for options that have not been set
  options.reverse_merge! Xen::XenToolsConf.find.to_hash 
  
  # Set some derived options
  options.reverse_merge! 'hostname' => name # Name host after this slice
  options['dhcp'] = true unless options['ip']
  options['swap'] ||= options['memory'].to_i * 2
  if options['root_pass']
    options['role'] = 'passwd'
    options['role-args'] = options['root_pass']
  end
  unless [nil,''].include?(options['tarball'])
    options['install-method'] = 'tar'
    options['install-source'] = options['tarball']
    options.delete('dist')
  end
  
  args = %w(hostname dist memory size
            force boot
            role role-args roledir
            dir lvm mirror 
            ip mac netmask broadcast gateway dhcp
            swap
            accounts admins cache config fs image image-dev initrd 
            keep kernel modules output install hooks partitions 
            passwd tar-cmd extension swap-dev noswap ide arch 
            install-method install-source template evms)
  # Remove options that are not in allowed argument list
  options.keys.each { |key| options.delete(key) unless args.include?(key) }
  
  Xen::Command.create_image(options)
end

#first_ip ⇒ Object 



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# File 'lib/xen/slice.rb', line 94

def first_ip
  config_file.vifs.first.ip if config_file and config_file.vifs
end

#instance ⇒ Object

Cache Xen instance info to reduce system calls to xm command. It still needs to be checked regularly as operations like shutdown and create can take a while.



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# File 'lib/xen/slice.rb', line 67

def instance
  if @instance_cache_expires > Time.now
    @instance
  else
    @instance_cache_expires = Time.now + Xen::INSTANCE_OBJECT_LIFETIME
    @instance = Xen::Instance.find(@name) if @name
  end
end

#ip ⇒ Object

Primary IP



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# File 'lib/xen/slice.rb', line 125

def ip
  config_file.vifs[0].ip
end

#root_disk ⇒ Object 



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# File 'lib/xen/slice.rb', line 120

def root_disk
  config_file.vbds.detect { |vbd| vbd.name == "#{name}-disk" } unless config_file.nil?
end

#running? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/xen/slice.rb', line 98

def running?
  self.instance ? true : false
end

#save ⇒ Object 



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# File 'lib/xen/slice.rb', line 116

def save
 @config_file.save
end

#start ⇒ Object 



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# File 'lib/xen/slice.rb', line 102

def start
  Xen::Instance.create(@name)
  @instance = Xen::Instance.find(@name)
end

#state ⇒ Object 



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# File 'lib/xen/slice.rb', line 90

def state
  self.instance ? :running : :stopped
end

#stop ⇒ Object 



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# File 'lib/xen/slice.rb', line 107

def stop
  Xen::Instance.shutdown(@name)
  @instance = Xen::Instance.find(@name)
end