Class: SystemDescription

Inherits:
Machinery::Object show all
Defined in:
lib/system_description.rb

Overview

The responsibility of the SystemDescription class is to represent a system description. This is our main data model.

The content of the system description is stored in a directory, which contains a manifest and sub directories for individual scopes. SystemDescription handles all the data which is in the top level of the system description directory.

The sub directories storing the data for specific scopes are handled by the ScopeFileStore class.

Constant Summary collapse

CURRENT_FORMAT_VERSION = 
5
EXTRACTABLE_SCOPES = 
[
  "changed_managed_files",
  "config_files",
  "unmanaged_files"
]

Instance Attribute Summary collapse

Attributes inherited from Machinery::Object

#attributes, #scope

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Machinery::Object

#==, #[], #[]=, #as_json, #compare_with, convert_element, convert_raw_hash, #empty?, from_json, has_property, #hash, #initialize_copy, #method_missing, #respond_to?, #set_attributes

Constructor Details

#initialize(name, store, hash = {}) ⇒ SystemDescription

Returns a new instance of SystemDescription.



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# File 'lib/system_description.rb', line 111

def initialize(name, store, hash = {})
  @name = name
  @store = store
  @format_version = CURRENT_FORMAT_VERSION
  @filter_definitions = {}

  super(create_scopes(hash))
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class Machinery::Object

Instance Attribute Details

#filter_definitions(command) ⇒ Object

Returns the value of attribute filter_definitions.



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# File 'lib/system_description.rb', line 39

def filter_definitions
  @filter_definitions
end

#format_version ⇒ Object

Returns the value of attribute format_version.



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# File 'lib/system_description.rb', line 38

def format_version
  @format_version
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/system_description.rb', line 36

def name
  @name
end

#store ⇒ Object

Returns the value of attribute store.



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# File 'lib/system_description.rb', line 37

def store
  @store
end

Class Method Details

.from_hash(name, store, hash) ⇒ Object 



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# File 'lib/system_description.rb', line 89

def from_hash(name, store, hash)
  begin
    json_format_version = hash["meta"]["format_version"] if hash["meta"]
    description = SystemDescription.new(name, store, hash)
  rescue NameError, TypeError
    if json_format_version && json_format_version != SystemDescription::CURRENT_FORMAT_VERSION
      raise Machinery::Errors::SystemDescriptionIncompatible.new(name, json_format_version)
    else
      raise Machinery::Errors::SystemDescriptionError.new
    end
  end

  description.format_version = json_format_version

  if hash["meta"] && hash["meta"]["filters"]
    description.filter_definitions = hash["meta"]["filters"]
  end

  description
end

.load(name, store, options = {}) ⇒ Object

Load the system description with the given name

If there are file validation errors these are put out as warnings but the loading of the system description succeeds.



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# File 'lib/system_description.rb', line 63

def load(name, store, options = {})
  manifest = Manifest.load(name, store.manifest_path(name))
  manifest.validate if !options[:skip_validation]

  description = from_hash(name, store, manifest.to_hash)
  description.validate_file_data if !options[:skip_validation]

  description.validate_format_compatibility if !options[:skip_format_compatibility]

  description
end

.load!(name, store, options = {}) ⇒ Object

Load the system description with the given name

If there are file validation errors the call fails with an exception



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# File 'lib/system_description.rb', line 45

def load!(name, store, options = {})
  manifest = Manifest.load(name, store.manifest_path(name))
  manifest.validate!

  description = from_hash(name, store, manifest.to_hash)
  description.validate_file_data!

  if !options[:skip_format_compatibility]
    description.validate_format_compatibility
  end

  description
end

.valid_name?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/system_description.rb', line 75

def valid_name?(name)
  !!/^[\w:-][\w\.:-]*$/.match(name)
end

.validate_name(name) ⇒ Object 



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# File 'lib/system_description.rb', line 79

def validate_name(name)
  unless valid_name?(name)
    raise Machinery::Errors::SystemDescriptionError.new(
      "System description name '#{name}' is invalid. " \
      "Only 'a-zA-Z0-9_:.-' are valid characters and a dot " \
      "is not allowed at the begginning."
    )
  end
end

Instance Method Details

#assert_scopes(*scopes) ⇒ Object 



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# File 'lib/system_description.rb', line 223

def assert_scopes(*scopes)
  missing = scopes.select { |scope| !self[scope] }

  unless missing.empty?
    raise Machinery::Errors::SystemDescriptionError.new(
      "The system description misses the following" \
        " #{Machinery.pluralize(missing.size, "scope")} : #{missing.join(", ")}."
    )
  end
end

#compatible? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/system_description.rb', line 145

def compatible?
  !format_version.nil? &&
    format_version == SystemDescription::CURRENT_FORMAT_VERSION
end

#create_scopes(hash) ⇒ Object 



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# File 'lib/system_description.rb', line 120

def create_scopes(hash)
  scopes = hash.map do |scope_name, json|
    next if scope_name == "meta"

    if store.persistent?
      scope_file_store = scope_file_store(scope_name)
    end

    if json.is_a?(Hash) || json.is_a?(Array)
      scope_object = Machinery::Scope.for(scope_name, json, scope_file_store)

      # Set metadata
      if hash["meta"] && hash["meta"][scope_name]
        scope_object.meta = Machinery::Object.from_json(hash["meta"][scope_name])
      end
    else
      scope_object = json
    end

    [scope_name, scope_object]
  end.compact

  Hash[scopes]
end

#description_path ⇒ Object 



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# File 'lib/system_description.rb', line 283

def description_path
  @store.description_path(name)
end

#has_file?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/system_description.rb', line 291

def has_file?(name)
  EXTRACTABLE_SCOPES.each do |scope|
    if scope_extracted?(scope)
      return true if self[scope] && self[scope].has_file?(name)
    end
  end
  false
end

#host ⇒ Object 



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# File 'lib/system_description.rb', line 278

def host
  all_hosts = attributes.keys.map { |scope| self[scope].meta.try(:[], "hostname") }
  all_hosts.uniq.compact
end

#latest_update ⇒ Object 



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# File 'lib/system_description.rb', line 273

def latest_update
  attributes.keys.map { |scope| self[scope].meta.try(:[], "modified") }
    .compact.map { |t| Time.parse(t) }.sort.last
end

#read_config(path, key) ⇒ Object 



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# File 'lib/system_description.rb', line 300

def read_config(path, key)
  EXTRACTABLE_SCOPES.each do |scope|
    if scope_extracted?(scope)
      file = self[scope].files.find { |f| f.name == path }
      return parse_variable_assignment(file.content, key) if file
    end
  end
end

#runs_service?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/system_description.rb', line 287

def runs_service?(name)
  self["services"].services.any? { |service| service.name == "#{name}.service" }
end

#save ⇒ Object 



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# File 'lib/system_description.rb', line 196

def save
  SystemDescription.validate_name(name)
  @store.directory_for(name)
  path = @store.manifest_path(name)
  created = !File.exists?(path)
  File.write(path, to_json)
  File.chmod(0600, path) if created
end

#scope_extracted?(scope) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/system_description.rb', line 247

def scope_extracted?(scope)
  self[scope] && self[scope].is_extractable? && self[scope].extracted
end

#scope_file_store(store_name) ⇒ Object 



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# File 'lib/system_description.rb', line 251

def scope_file_store(store_name)
  ScopeFileStore.new(description_path, store_name)
end

#scopes ⇒ Object 



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# File 'lib/system_description.rb', line 219

def scopes
  Inspector.sort_scopes(attributes.keys.map(&:to_s).sort)
end

#set_filter_definitions(command, filter) ⇒ Object 



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# File 'lib/system_description.rb', line 209

def set_filter_definitions(command, filter)
  if !["inspect"].include?(command)
    raise Machinery::Errors::MachineryError.new(
      "Storing the filter for command '#{command}' is not supported."
    )
  end

  @filter_definitions[command] = filter
end

#short_os_version ⇒ Object 



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# File 'lib/system_description.rb', line 234

def short_os_version
  assert_scopes("os")

  case self.os.name
    when /^SUSE Linux Enterprise Server/
      "sles" + self.os.version[/\d+( SP\d+)*/].gsub(" ", "").downcase
    when /^openSUSE/
      self.os.version[/^\d+.\d+/]
    else
      "unknown"
  end
end

#to_hash ⇒ Object 



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# File 'lib/system_description.rb', line 175

def to_hash
  meta = {}
  meta["format_version"] = self.format_version if self.format_version

  attributes.keys.each do |key|
    meta[key] = self[key].meta.as_json if self[key].meta
  end
  @filter_definitions.each do |command, filter|
    meta["filters"] ||= {}
    meta["filters"][command] = filter
  end

  hash = as_json
  hash["meta"] = meta unless meta.empty?
  hash
end

#to_json ⇒ Object 



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# File 'lib/system_description.rb', line 192

def to_json
  JSON.pretty_generate(to_hash)
end

#validate_analysis_compatibility ⇒ Object 



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# File 'lib/system_description.rb', line 156

def validate_analysis_compatibility
  Zypper.isolated(arch: os.architecture) do |zypper|
    major, minor, patch = zypper.version
    if major <= 1 && minor <= 11 && patch < 4
      raise Machinery::Errors::AnalysisFailed.new("Analyzing command requires zypper 1.11.4 " \
        "or grater to be installed.")
    end
  end
end

#validate_build_compatibility ⇒ Object 



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# File 'lib/system_description.rb', line 166

def validate_build_compatibility
  kiwi_template_path = "/usr/share/kiwi/image/#{os.kiwi_boot}"
  unless Dir.exist?(kiwi_template_path)
    raise Machinery::Errors::BuildFailed.new("The execution of the build script failed. " \
      "Building of operating system '#{os.display_name}' can't be accomplished because the " \
      "kiwi template file in `#{kiwi_template_path}` does not exist.")
  end
end

#validate_file_data ⇒ Object 



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# File 'lib/system_description.rb', line 255

def validate_file_data
  errors = FileValidator.new(to_hash, description_path).validate
  if !errors.empty?
    Machinery::Ui.warn("Warning: File validation errors:")
    Machinery::Ui.warn("Error validating description '#{@name}'\n\n")
    Machinery::Ui.warn(errors.join("\n"))
  end
end

#validate_file_data! ⇒ Object 



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# File 'lib/system_description.rb', line 264

def validate_file_data!
  errors = FileValidator.new(to_hash, description_path).validate
  if !errors.empty?
    e = Machinery::Errors::SystemDescriptionValidationFailed.new(errors)
    e.header = "Error validating description '#{@name}'"
    raise e
  end
end

#validate_format_compatibility ⇒ Object 



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# File 'lib/system_description.rb', line 150

def validate_format_compatibility
  if !compatible?
    raise Machinery::Errors::SystemDescriptionIncompatible.new(name, format_version)
  end
end