Class: Baha::Image

Inherits:
Object
  • Object
show all
Defined in:
lib/baha/image.rb

Constant Summary collapse

LOG = 
Baha::Log.for_name("Image")

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config, image) ⇒ Image

Returns a new instance of Image.



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# File 'lib/baha/image.rb', line 70

def initialize(config,image)
  @parent = Baha::Image.parse_with_default(image['parent'] || config.defaults[:parent], config.defaults[:repository])
  @image  = Baha::Image.parse_with_default(image['name'], config.defaults[:repository])
  @image[:tag] = image['tag'] if image.has_key?('tag')
  @maintainer = image['maintainer'] || config.defaults[:maintainer]
  @options = Baha::ContainerOptions::parse_options(image['config'])
  @pre_build = image['pre_build']
  @bind = image['bind'] || config.defaults[:bind]
  @command = image['command'] || config.defaults[:command]
  @run = image['run']
  @timeout = image['timeout'] || config.defaults[:timeout]
  @workspace = config.workspace + (image['workspace'] || @image[:name])
  @name = @image[:name]
  @tags = Set.new [
    "#{@image[:name]}:#{@image[:tag]}",
    "#{@image[:name]}:latest"
  ]
  if @image[:ns]
    @tags << "#{@image[:ns]}/#{@image[:name]}:#{@image[:tag]}"
    @tags << "#{@image[:ns]}/#{@image[:name]}:latest"
  end
end

Instance Attribute Details

#bind ⇒ Object (readonly)

Returns the value of attribute bind.



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# File 'lib/baha/image.rb', line 68

def bind
  @bind
end

#command ⇒ Object (readonly)

Returns the value of attribute command.



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# File 'lib/baha/image.rb', line 68

def command
  @command
end

#image ⇒ Object (readonly)

Returns the value of attribute image.



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# File 'lib/baha/image.rb', line 68

def image
  @image
end

#maintainer ⇒ Object (readonly)

Returns the value of attribute maintainer.



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# File 'lib/baha/image.rb', line 68

def maintainer
  @maintainer
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/baha/image.rb', line 68

def name
  @name
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/baha/image.rb', line 68

def options
  @options
end

#parent ⇒ Object (readonly)

Returns the value of attribute parent.



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# File 'lib/baha/image.rb', line 68

def parent
  @parent
end

#pre_build ⇒ Object (readonly)

Returns the value of attribute pre_build.



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# File 'lib/baha/image.rb', line 68

def pre_build
  @pre_build
end

#run ⇒ Object (readonly)

Returns the value of attribute run.



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# File 'lib/baha/image.rb', line 68

def run
  @run
end

#tags ⇒ Object (readonly)

Returns the value of attribute tags.



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# File 'lib/baha/image.rb', line 68

def tags
  @tags
end

#timeout ⇒ Object (readonly)

Returns the value of attribute timeout.



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# File 'lib/baha/image.rb', line 68

def timeout
  @timeout
end

#workspace ⇒ Object (readonly)

Returns the value of attribute workspace.



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# File 'lib/baha/image.rb', line 68

def workspace
  @workspace
end

Class Method Details

.get_image!(image) ⇒ Object

Raises:



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# File 'lib/baha/image.rb', line 44

def get_image!(image)
  LOG.debug { "get_image!(#{image.inspect})" }
  tag = image[:tag] || 'latest'
  repo = "#{image[:ns]}/#{image[:name]}"
  img = [ 
    lambda { Docker::Image.get("#{image[:name]}:#{image[:tag]}") },
    lambda { Docker::Image.create('fromImage'=> image[:name], 'tag' => tag) },
    lambda { Docker::Image.create('fromImage' => repo, 'tag' => tag) }
  ].reduce(nil) do |result,block|
    unless result
      begin
        result = block.call
        result = Docker::Image.get(result.id)
      rescue
        result = nil
      end
    end
    result
  end
  raise Baha::ImageNotFoundError.new(image) unless img
  img
end

.parse_name(image) ⇒ Object

Parses an image name



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# File 'lib/baha/image.rb', line 18

def parse_name(image)
  m = /(?:([a-z0-9\-._\/]+))(?::([a-zA-Z0-9\-._]+))?/.match(image)
  unless m
    raise ArgumentError.new("Unable to parse image name #{image}")
  end
  tag  = m.captures[1]
  tag  ||= 'latest'
  imagename = m.captures[0]
  m2 = /(?:(.+)\/)?(.+)/.match(imagename)
  ns = m2.captures[0]
  name = m2.captures[1]
  {
    :ns    => ns,
    :name  => name,
    :tag   => tag
  }
end

.parse_with_default(image, repository) ⇒ Object 



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# File 'lib/baha/image.rb', line 36

def parse_with_default(image,repository)
  i = parse_name(image)
  unless i[:ns]
    i[:ns] = repository
  end
  i
end

Instance Method Details

#commit_config ⇒ Object 



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# File 'lib/baha/image.rb', line 109

def commit_config
  @options.values.reduce({}) do |memo,option|
    option.apply(memo)
    memo
  end
end

#env ⇒ Object 



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# File 'lib/baha/image.rb', line 93

def env
  {
    :parent => @parent,
    :maintainer => @maintainer,
    :bind => @bind,
    :name => @image[:name],
    :tag  => @image[:tag],
    :workspace => @workspace.expand_path.to_s
  }
end

#inspect ⇒ Object 



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# File 'lib/baha/image.rb', line 140

def inspect
  <<-eos.gsub(/\n?\s{2,}/,'')
  #{self.class.name}<
    @parent=#{@parent.inspect},
    @image=#{@image.inspect},
    @maintainer=#{@maintainer},
    @options=#{@options.inspect},
    @pre_build=#{@pre_build.inspect},
    @bind=#{@bind},
    @command=#{@command.inspect},
    @timeout=#{@timeout}
  >
  eos
end

#needs_update? ⇒ Boolean

Checks if the image needs updating

  1. If it’s parent image has changed

  2. If the desired tag is not found

Will raise Baha::ImageNotFoundError if the parent image can not be found

Returns:

  • (Boolean) 


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# File 'lib/baha/image.rb', line 120

def needs_update?
  LOG.debug { "needs_update?(#{@image.inspect})" }
  parent = Baha::Image.get_image!(@parent)
  LOG.debug { "got parent: #{parent.inspect}" }
  begin
    image = Baha::Image.get_image!(@image)
    LOG.debug { "got image: #{image.inspect}" }
    parent_id = image.info['Parent']
    this_tags = image.history[0]["Tags"]
    local_tag = "#{@image[:name]}:#{@image[:tag]}"
    remote_tag = "#{@image[:ns]}/#{local_tag}"
    LOG.debug { "current parent id = #{parent_id}" }
    LOG.debug { "current image tags = #{parent_id}" }
    LOG.debug { "current parent id = #{parent_id}" }
    parent_id != parent.id or not ( this_tags.include?(local_tag) or this_tags.include?(remote_tag) )
  rescue
    true
  end
end

#parent_id ⇒ Object 



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# File 'lib/baha/image.rb', line 104

def parent_id
  parent = Baha::Image.get_image!(@parent)
  parent.id
end