Class: Chef::CookbookVersion

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Includes:
Comparable
Defined in:
lib/chef/cookbook_version.rb

Overview

Chef::CookbookVersion

CookbookVersion is a model object encapsulating the data about a Chef cookbook. Chef supports maintaining multiple versions of a cookbook on a single server; each version is represented by a distinct instance of this class.

Constant Summary collapse

COOKBOOK_SEGMENTS = 
%i{resources providers recipes definitions libraries attributes files templates root_files}.freeze

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, *root_paths, chef_server_rest: nil) ⇒ CookbookVersion

Creates a new Chef::CookbookVersion object.

Returns

object<Chef::CookbookVersion>

Duh. :)



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# File 'lib/chef/cookbook_version.rb', line 94

def initialize(name, *root_paths, chef_server_rest: nil)
  @name = name
  @root_paths = root_paths
  @frozen = false

  @all_files = []

  @file_vendor = nil
  @cookbook_manifest = Chef::CookbookManifest.new(self)
  @metadata = Chef::Cookbook::Metadata.new
  @chef_server_rest = chef_server_rest
end

Instance Attribute Details

#all_files ⇒ Object

Returns the value of attribute all_files.



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# File 'lib/chef/cookbook_version.rb', line 47

def all_files
  @all_files
end

#identifier ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

The ‘identifier` field is used for cookbook_artifacts, which are organized on the chef server according to their content. If the policy_mode option to CookbookManifest is set to true it will include this field in the manifest Hash and in the upload URL.

This field may be removed or have different behavior in the future, don’t use it in 3rd party code.



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# File 'lib/chef/cookbook_version.rb', line 65

def identifier
  @identifier
end

#metadata ⇒ Object

A Chef::Cookbook::Metadata object. It has a setter that fixes up the metadata to add descriptions of the recipes contained in this CookbookVersion.



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# File 'lib/chef/cookbook_version.rb', line 55

def metadata
  @metadata
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/chef/cookbook_version.rb', line 50

def name
  @name
end

#root_paths ⇒ Object

Returns the value of attribute root_paths.



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# File 'lib/chef/cookbook_version.rb', line 49

def root_paths
  @root_paths
end

Class Method Details

.available_versions(cookbook_name) ⇒ Object

Given a cookbook_name, get a list of all versions that exist on the server.

Returns

[String]

Array of cookbook versions, which are strings like ‘x.y.z’

nil

if the cookbook doesn’t exist. an error will also be logged.



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# File 'lib/chef/cookbook_version.rb', line 490

def self.available_versions(cookbook_name)
  chef_server_rest.get("cookbooks/#{cookbook_name}")[cookbook_name]["versions"].map do |cb|
    cb["version"]
  end
rescue Net::HTTPClientException => e
  if e.to_s =~ /^404/
    Chef::Log.error("Cannot find a cookbook named #{cookbook_name}")
    nil
  else
    raise
  end
end

.cache ⇒ Object 



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# File 'lib/chef/cookbook_version.rb', line 86

def self.cache
  Chef::FileCache
end

.checksum_cookbook_file(filepath) ⇒ Object

This is the one and only method that knows how cookbook files’ checksums are generated.



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# File 'lib/chef/cookbook_version.rb', line 79

def self.checksum_cookbook_file(filepath)
  Chef::Digester.generate_md5_checksum_for_file(filepath)
rescue Errno::ENOENT
  Chef::Log.trace("File #{filepath} does not exist, so there is no checksum to generate")
  nil
end

.chef_server_rest ⇒ Object 



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# File 'lib/chef/cookbook_version.rb', line 456

def self.chef_server_rest
  Chef::ServerAPI.new(Chef::Config[:chef_server_url], { version_class: Chef::CookbookManifestVersions })
end

.from_cb_artifact_data(o) ⇒ Object 



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# File 'lib/chef/cookbook_version.rb', line 430

def self.from_cb_artifact_data(o)
  from_hash(o)
end

.from_hash(o) ⇒ Object 



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# File 'lib/chef/cookbook_version.rb', line 415

def self.from_hash(o)
  cookbook_version = new(o["cookbook_name"] || o["name"])

  # We want the Chef::Cookbook::Metadata object to always be inflated
  cookbook_version.manifest = o
  cookbook_version.metadata = Chef::Cookbook::Metadata.from_hash(o["metadata"])
  cookbook_version.identifier = o["identifier"] if o.key?("identifier")

  # We don't need the following step when we decide to stop supporting deprecated operators in the metadata (e.g. <<, >>)
  cookbook_version.manifest["metadata"] = Chef::JSONCompat.from_json(Chef::JSONCompat.to_json(cookbook_version.metadata))

  cookbook_version.freeze_version if o["frozen?"]
  cookbook_version
end

.list ⇒ Object Also known as: latest_cookbooks

The API returns only a single version of each cookbook in the result from the cookbooks method



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# File 'lib/chef/cookbook_version.rb', line 471

def self.list
  chef_server_rest.get("cookbooks")
end

.list_all_versions ⇒ Object 



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# File 'lib/chef/cookbook_version.rb', line 480

def self.list_all_versions
  chef_server_rest.get("cookbooks?num_versions=all")
end

.load(name, version = "_latest") ⇒ Object 



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# File 'lib/chef/cookbook_version.rb', line 465

def self.load(name, version = "_latest")
  version = "_latest" if version == "latest"
  from_hash(chef_server_rest.get("cookbooks/#{name}/#{version}"))
end

Instance Method Details

#<=>(other) ⇒ Object

Raises:



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# File 'lib/chef/cookbook_version.rb', line 503

def <=>(other)
  raise Chef::Exceptions::CookbookVersionNameMismatch if name != other.name

  # FIXME: can we change the interface to the Metadata class such
  # that metadata.version returns a Chef::Version instance instead
  # of a string?
  Chef::Version.new(version) <=> Chef::Version.new(other.version)
end

#attribute_filenames_by_short_filename ⇒ Object 



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# File 'lib/chef/cookbook_version.rb', line 131

def attribute_filenames_by_short_filename
  @attribute_filenames_by_short_filename ||= begin
    name_map = filenames_by_name(files_for("attributes"))
    root_alias = cookbook_manifest.root_files.find { |record| record[:name] == "root_files/attributes.rb" }
    name_map["default"] = root_alias[:full_path] if root_alias
    name_map
  end
end

#checksums ⇒ Object

Returns a hash of checksums to either nil or the on disk path (which is done by generate_manifest).



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# File 'lib/chef/cookbook_version.rb', line 167

def checksums
  cookbook_manifest.checksums
end

#chef_server_rest ⇒ Object

REST API



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# File 'lib/chef/cookbook_version.rb', line 452

def chef_server_rest
  @chef_server_rest ||= chef_server_rest
end

#cookbook_manifest ⇒ Object 



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# File 'lib/chef/cookbook_version.rb', line 512

def cookbook_manifest
  @cookbook_manifest ||= CookbookManifest.new(self)
end

#destroy ⇒ Object 



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# File 'lib/chef/cookbook_version.rb', line 460

def destroy
  chef_server_rest.delete("cookbooks/#{name}/#{version}")
  self
end

#display ⇒ Object 



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# File 'lib/chef/cookbook_version.rb', line 405

def display
  output = Mash.new
  output["cookbook_name"] = name
  output["name"] = full_name
  output["frozen?"] = frozen_version?
  output["metadata"] = metadata.to_h
  output["version"] = version
  output.merge(cookbook_manifest.by_parent_directory)
end

#freeze_version ⇒ Object 



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# File 'lib/chef/cookbook_version.rb', line 118

def freeze_version
  @frozen = true
end

#frozen_version? ⇒ Boolean

Indicates if this version is frozen or not. Freezing a coobkook version indicates that a new cookbook with the same name and version number shoule

Returns:

  • (Boolean) 


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# File 'lib/chef/cookbook_version.rb', line 114

def frozen_version?
  @frozen
end

#full_name ⇒ Object 



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# File 'lib/chef/cookbook_version.rb', line 127

def full_name
  "#{name}-#{version}"
end

#fully_qualified_recipe_names ⇒ Object

Return recipe names in the form of cookbook_name::recipe_name



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# File 'lib/chef/cookbook_version.rb', line 176

def fully_qualified_recipe_names
  files_for("recipes").inject([]) do |memo, recipe|
    rname = recipe[:name].split("/")[1]
    rname = File.basename(rname, ".rb")
    memo << "#{name}::#{rname}"
    memo
  end
end

#has_cookbook_file_for_node?(node, cookbook_filename) ⇒ Boolean

Query whether a cookbook_file file cookbook_filename is available. File specificity for the given node is obeyed in the lookup.

Returns:

  • (Boolean) 


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# File 'lib/chef/cookbook_version.rb', line 215

def has_cookbook_file_for_node?(node, cookbook_filename)
  !!find_preferred_manifest_record(node, :files, cookbook_filename)
end

#has_template_for_node?(node, template_filename) ⇒ Boolean

Query whether a template file template_filename is available. File specificity for the given node is obeyed in the lookup.

Returns:

  • (Boolean) 


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# File 'lib/chef/cookbook_version.rb', line 209

def has_template_for_node?(node, template_filename)
  !!find_preferred_manifest_record(node, :templates, template_filename)
end

#load_recipe(recipe_name, run_context) ⇒ Object

called from DSL



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# File 'lib/chef/cookbook_version.rb', line 186

def load_recipe(recipe_name, run_context)
  unless recipe_filenames_by_name.key?(recipe_name)
    raise Chef::Exceptions::RecipeNotFound, "could not find recipe #{recipe_name} for cookbook #{name}"
  end

  Chef::Log.trace("Found recipe #{recipe_name} in cookbook #{name}")
  recipe = Chef::Recipe.new(name, recipe_name, run_context)
  recipe_filename = recipe_filenames_by_name[recipe_name]

  unless recipe_filename
    raise Chef::Exceptions::RecipeNotFound, "could not find #{recipe_name} files for cookbook #{name}"
  end

  recipe.from_file(recipe_filename)
  recipe
end

#manifest ⇒ Object 



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# File 'lib/chef/cookbook_version.rb', line 157

def manifest
  cookbook_manifest.manifest
end

#manifest=(new_manifest) ⇒ Object 



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# File 'lib/chef/cookbook_version.rb', line 161

def manifest=(new_manifest)
  cookbook_manifest.update_from(new_manifest)
end

#manifest_records_by_path ⇒ Object 



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# File 'lib/chef/cookbook_version.rb', line 171

def manifest_records_by_path
  cookbook_manifest.manifest_records_by_path
end

#metadata_json_file ⇒ Object 



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# File 'lib/chef/cookbook_version.rb', line 434

def metadata_json_file
  File.join(root_paths[0], "metadata.json")
end

#metadata_rb_file ⇒ Object 



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# File 'lib/chef/cookbook_version.rb', line 438

def metadata_rb_file
  File.join(root_paths[0], "metadata.rb")
end

#preferred_filename_on_disk_location(node, segment, filename, current_filepath = nil) ⇒ Object 



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# File 'lib/chef/cookbook_version.rb', line 271

def preferred_filename_on_disk_location(node, segment, filename, current_filepath = nil)
  manifest_record = preferred_manifest_record(node, segment, filename)
  if current_filepath && (manifest_record["checksum"] == self.class.checksum_cookbook_file(current_filepath))
    nil
  else
    file_vendor.get_filename(manifest_record["path"])
  end
end

#preferred_manifest_record(node, segment, filename) ⇒ Object

Determine the most specific manifest record for the given segment/filename, given information in the node. Throws FileNotFound if there is no such segment and filename in the manifest.

A manifest record is a Mash that follows the following form: 

:name => "example.rb",
:path => "files/default/example.rb",
:specificity => "default",
:checksum => "1234"




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# File 'lib/chef/cookbook_version.rb', line 231

def preferred_manifest_record(node, segment, filename)
  found_pref = find_preferred_manifest_record(node, segment, filename)
  if found_pref
    manifest_records_by_path[found_pref]
  else
    if segment == :files || segment == :templates
      error_message = "Cookbook '#{name}' (#{version}) does not contain a file at any of these locations:\n"
      error_locations = if filename.is_a?(Array)
                          filename.map { |name| "  #{File.join(segment.to_s, name)}" }
                        else
                          [
                            "  #{segment}/host-#{node[:fqdn]}/#{filename}",
                            "  #{segment}/#{node[:platform]}-#{node[:platform_version]}/#{filename}",
                            "  #{segment}/#{node[:platform]}/#{filename}",
                            "  #{segment}/default/#{filename}",
                            "  #{segment}/#{filename}",
                          ]
                        end
      error_message << error_locations.join("\n")
      existing_files = segment_filenames(segment)
      # Strip the root_dir prefix off all files for readability
      pretty_existing_files = existing_files.map do |path|
        if root_dir
          path[root_dir.length + 1..-1]
        else
          path
        end
      end
      # Show the files that the cookbook does have. If the user made a typo,
      # hopefully they'll see it here.
      unless pretty_existing_files.empty?
        error_message << "\n\nThis cookbook _does_ contain: ['#{pretty_existing_files.join("','")}']"
      end
      raise Chef::Exceptions::FileNotFound, error_message
    else
      raise Chef::Exceptions::FileNotFound, "cookbook #{name} does not contain file #{segment}/#{filename}"
    end
  end
end

#preferred_manifest_records_for_directory(node, segment, dirname) ⇒ Object

Determine the manifest records from the most specific directory for the given node. See #preferred_manifest_record for a description of entries of the returned Array.

Raises:



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# File 'lib/chef/cookbook_version.rb', line 320

def preferred_manifest_records_for_directory(node, segment, dirname)
  preferences = preferences_for_path(node, segment, dirname)
  records_by_pref = {}
  preferences.each { |pref| records_by_pref[pref] = [] }

  files_for(segment).each do |manifest_record|
    manifest_record_path = manifest_record[:path]

    # extract the preference part from the path.
    if manifest_record_path =~ %r{(#{Regexp.escape(segment.to_s)}/[^/]+/#{Regexp.escape(dirname)})/.+$}
        # Note the specificy_dirname includes the segment and
        # dirname argument as above, which is what
        # preferences_for_path returns. It could be
        # "files/ubuntu-9.10/dirname", for example.
      specificity_dirname = $1

      # Record the specificity_dirname only if it's in the list of
      # valid preferences
      if records_by_pref[specificity_dirname]
        records_by_pref[specificity_dirname] << manifest_record
      end
    end
  end

  best_pref = preferences.find { |pref| !records_by_pref[pref].empty? }

  raise Chef::Exceptions::FileNotFound, "cookbook #{name} (#{version}) has no directory #{segment}/default/#{dirname}" unless best_pref

  records_by_pref[best_pref]
end

#recipe_filenames_by_name ⇒ Object 



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# File 'lib/chef/cookbook_version.rb', line 140

def recipe_filenames_by_name
  @recipe_filenames_by_name ||= begin
    name_map = filenames_by_name(files_for("recipes"))
    root_alias = cookbook_manifest.root_files.find { |record| record[:name] == "root_files/recipe.rb" }
    if root_alias
      Chef::Log.error("Cookbook #{name} contains both recipe.rb and and recipes/default.rb, ignoring recipes/default.rb") if name_map["default"]
      name_map["default"] = root_alias[:full_path]
    end
    name_map
  end
end

#relative_filenames_in_preferred_directory(node, segment, dirname) ⇒ Object

Raises:



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# File 'lib/chef/cookbook_version.rb', line 280

def relative_filenames_in_preferred_directory(node, segment, dirname)
  preferences = preferences_for_path(node, segment, dirname)
  filenames_by_pref = {}
  preferences.each { |pref| filenames_by_pref[pref] = [] }

  files_for(segment).each do |manifest_record|
    manifest_record_path = manifest_record[:path]

    # find the NON SPECIFIC filenames, but prefer them by filespecificity.
    # For example, if we have a file:
    # 'files/default/somedir/somefile.conf' we only keep
    # 'somedir/somefile.conf'. If there is also
    # 'files/$hostspecific/somedir/otherfiles' that matches the requested
    # hostname specificity, that directory will win, as it is more specific.
    #
    # This is clearly ugly b/c the use case is for remote directory, where
    # we're just going to make cookbook_files out of these and make the
    # cookbook find them by filespecificity again. but it's the shortest
    # path to "success" for now.
    if manifest_record_path =~ %r{(#{Regexp.escape(segment.to_s)}/[^/]*/?#{Regexp.escape(dirname)})/.+$}
      specificity_dirname = $1
      non_specific_path = manifest_record_path[%r{#{Regexp.escape(segment.to_s)}/[^/]*/?#{Regexp.escape(dirname)}/(.+)$}, 1]
      # Record the specificity_dirname only if it's in the list of
      # valid preferences
      if filenames_by_pref[specificity_dirname]
        filenames_by_pref[specificity_dirname] << non_specific_path
      end
    end
  end

  best_pref = preferences.find { |pref| !filenames_by_pref[pref].empty? }

  raise Chef::Exceptions::FileNotFound, "cookbook #{name} has no directory #{segment}/default/#{dirname}" unless best_pref

  filenames_by_pref[best_pref]
end

#reload_metadata! ⇒ Object 



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# File 'lib/chef/cookbook_version.rb', line 442

def reload_metadata!
  if File.exists?(metadata_json_file)
    metadata.from_json(IO.read(metadata_json_file))
  end
end

#root_dir ⇒ Object

The first root path is the primary cookbook dir, from which metadata is loaded



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# File 'lib/chef/cookbook_version.rb', line 68

def root_dir
  root_paths[0]
end

#segment_filenames(segment) ⇒ Object 



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# File 'lib/chef/cookbook_version.rb', line 203

def segment_filenames(segment)
  files_for(segment).map { |f| f["full_path"] || File.join(root_dir, f["path"]) }
end

#version ⇒ Object 



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# File 'lib/chef/cookbook_version.rb', line 107

def version
  metadata.version
end

#version=(new_version) ⇒ Object 



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# File 'lib/chef/cookbook_version.rb', line 122

def version=(new_version)
  cookbook_manifest.reset!
  metadata.version(new_version)
end