Class: Cangallo::Repo

Inherits:
Object
  • Object
show all
Defined in:
lib/cangallo/repo.rb

Constant Summary collapse

VERSION = 
0

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(conf) ⇒ Repo

Returns a new instance of Repo.



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# File 'lib/cangallo/repo.rb', line 29

def initialize(conf)
  @conf = conf
  @path = File.expand_path(@conf["path"])
  @name = @conf["name"]
  @type = @conf["type"]
  @url  = @conf["url"]

  if !@type && @url
    @type = "remote"
  else
    @type = "local"
  end

  read_index
end

Instance Attribute Details

#images ⇒ Object (readonly)

Returns the value of attribute images.



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# File 'lib/cangallo/repo.rb', line 25

def images
  @images
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/cangallo/repo.rb', line 25

def name
  @name
end

#path ⇒ Object (readonly)

Returns the value of attribute path.



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# File 'lib/cangallo/repo.rb', line 25

def path
  @path
end

#tags ⇒ Object (readonly)

Returns the value of attribute tags.



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# File 'lib/cangallo/repo.rb', line 25

def tags
  @tags
end

Instance Method Details

#add(name, data) ⇒ Object 



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# File 'lib/cangallo/repo.rb', line 97

def add(name, data)
  data["creation-time"] = Time.now
  data["sha256"] = name
  @images[name] = data
end

#add_image(file, data = {}) ⇒ Object 



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# File 'lib/cangallo/repo.rb', line 103

def add_image(file, data = {})
  parent_sha256 = nil
  parent = nil
  parent_path = nil

  only_copy = data.delete("only_copy")

  if data["parent"]
    parent_sha256 = data["parent"]
    parent = self.images[parent_sha256]

    if !parent
      raise "Parent not found"
    end

    parent_path = File.expand_path(self.image_path(parent_sha256))
  end

  puts "Calculating image sha256 with libguestfs (it will take some time)"
  qcow2 = Cangallo::Qcow2.new(file)
  sha256 = qcow2.sha256
  sha256.strip! if sha256

  puts "Image SHA256: #{sha256}"

  puts "Copying file to repository"
  image_path = self.image_path(sha256)
  qcow2.copy(image_path, parent: parent_path, only_copy: only_copy)

  qcow2 = Cangallo::Qcow2.new(image_path)
  info = qcow2.info

  info_data = info.select do |k,v|
    %w{virtual-size format actual-size format-specific}.include?(k)
  end

  data.merge!(info_data)

  data["file-sha256"] = Digest::SHA256.file(file).hexdigest

  if parent
    qcow2.rebase("#{parent_sha256}.qcow2")
    data["parent"] = parent_sha256
  end

  self.add(sha256, data)
  self.write_index

  sha256
end

#add_tag(tag, image) ⇒ Object 



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# File 'lib/cangallo/repo.rb', line 175

def add_tag(tag, image)
  img = find(image)
  @tags[tag] = img
  write_index
end

#ancestors(name) ⇒ Object 



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# File 'lib/cangallo/repo.rb', line 217

def ancestors(name)
  ancestors = []

  image = get(name)
  ancestors << image["sha256"]

  while image["parent"]
    image = get(image["parent"])
    ancestors << image["sha256"]
  end

  ancestors
end

#del_image(image) ⇒ Object 



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# File 'lib/cangallo/repo.rb', line 154

def del_image(image)
  sha256 = find(image)

  raise %Q{Image "#{image}" does not exist} if !sha256

  path = image_path(sha256)
  begin
      File.delete(path)
  rescue Errno::ENOENT
      STDERR.puts "Image file not found"
  end

  @images.delete(sha256)

  @tags.select {|key, value| value == sha256 }.keys.each do |tag|
      @tags.delete(tag)
  end

  write_index
end

#del_tag(tag) ⇒ Object 



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# File 'lib/cangallo/repo.rb', line 181

def del_tag(tag)
  @tags.delete(tag)
  write_index
end

#fetch ⇒ Object 



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# File 'lib/cangallo/repo.rb', line 235

def fetch
  return nil if @conf["type"] != "remote"

  uri = remote_url("index.yaml")

  open(uri, "r") do |f|
    data = f.read
    read_index(data)
  end

  write_index
end

#find(name, search_tags = true) ⇒ Object 



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# File 'lib/cangallo/repo.rb', line 186

def find(name, search_tags = true)
  length = name.length
  found = @images.select do |sha256, data|
    sha256[0, length] == name
  end

  if found && found.length > 0
    return found.first.first
  end

  if search_tags
    found = @tags.select do |tag, sha256|
      tag == name
    end
  end

  if found && found.length > 0
    return found.first[1]
  end

  nil
end

#get(name) ⇒ Object 



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# File 'lib/cangallo/repo.rb', line 209

def get(name)
  image = find(name)

  return nil if !image

  @images[image]
end

#image_path(name) ⇒ Object 



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# File 'lib/cangallo/repo.rb', line 85

def image_path(name)
  File.join(@path, "#{name}.qcow2")
end

#index_data(images = {}, tags = {}, version = VERSION) ⇒ Object 



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# File 'lib/cangallo/repo.rb', line 45

def index_data(images = {}, tags = {}, version = VERSION)
  {
    "version" => version,
    "images"  => images,
    "tags"    => tags
  }
end

#index_path ⇒ Object 



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# File 'lib/cangallo/repo.rb', line 53

def index_path
  metadata_path("index")
end

#metadata_path(name) ⇒ Object 



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# File 'lib/cangallo/repo.rb', line 81

def metadata_path(name)
  File.join(@path, "#{name}.yaml")
end

#pull(name) ⇒ Object 



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# File 'lib/cangallo/repo.rb', line 256

def pull(name)
  image = get(name)

  raise "Image not found" if !image

  sha256 = image["sha256"]
  image_url = remote_image_url(sha256)
  image_path = image_path(sha256)
  cmd = "curl -o '#{image_path}' '#{image_url}'"

  STDERR.puts(cmd)

  system(cmd)
end

#read_index(index = nil) ⇒ Object 



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# File 'lib/cangallo/repo.rb', line 57

def read_index(index = nil)
  if !index
    if File.exist?(index_path)
      data = YAML.load(File.read(index_path))
    else
      data = index_data()
    end
  else
    data = YAML.load(index)
  end

  @images       = data["images"]
  @tags         = data["tags"]
  @reverse_tags = @tags.invert
end

#remote_image_url(name) ⇒ Object 



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# File 'lib/cangallo/repo.rb', line 93

def remote_image_url(name)
  remote_url("#{name}.qcow2")
end

#remote_url(name) ⇒ Object 



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# File 'lib/cangallo/repo.rb', line 89

def remote_url(name)
  URI.join(@url, name)
end

#short_name(sha256) ⇒ Object 



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# File 'lib/cangallo/repo.rb', line 271

def short_name(sha256)
  tag = @reverse_tags[sha256]

  if tag
    name = "#{tag}"
  else
    name = "#{sha256[0..15]}"
  end

  name
end

#sign ⇒ Object 



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# File 'lib/cangallo/repo.rb', line 248

def sign
  Keybase.sign(index_path)
end

#url ⇒ Object 



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# File 'lib/cangallo/repo.rb', line 231

def url
  @conf["url"]
end

#verify ⇒ Object 



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# File 'lib/cangallo/repo.rb', line 252

def verify
  Keybase.verify(index_path)
end

#write_index ⇒ Object 



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# File 'lib/cangallo/repo.rb', line 73

def write_index
  data = index_data(@images, @tags)

  open(metadata_path("index"), "w") do |f|
    f.write(data.to_yaml)
  end
end