Class: Fig::Environment

Inherits:
Object
  • Object
show all
Defined in:
lib/fig/environment.rb

Overview

Manages the program’s metadata, including packages and environment variables, and sets things up for running commands (from “command” statements in definition files or from the command-line).

Instance Method Summary collapse

Constructor Details

#initialize(repository, variables_override, working_directory_maintainer) ⇒ Environment

Note: when reading this code, understand that the word “retrieve” is a noun and not a verb, e.g. “retrieve path” means the value of a retrieve statement and not the action of retrieving a path.



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# File 'lib/fig/environment.rb', line 23

def initialize(repository, variables_override, working_directory_maintainer)
  @repository = repository
  @variables =
    variables_override || Fig::OperatingSystem.get_environment_variables()
  @retrieves = {}
  @packages = {}
  @working_directory_maintainer = working_directory_maintainer
end

Instance Method Details

#[](name) ⇒ Object

Returns the value of an envirionment variable



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# File 'lib/fig/environment.rb', line 33

def [](name)
  return @variables[name]
end

#add_retrieve(retrieve_statement) ⇒ Object

Indicates that the values from a particular environment variable path should be copied to a local directory.



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# File 'lib/fig/environment.rb', line 43

def add_retrieve(retrieve_statement)
  name = retrieve_statement.var
  if @retrieves.has_key?(name)
    Fig::Logging.warn \
      %q<About to overwrite "#{name}" retrieve path of "#{@retrieves[name].path}" with "#{retrieve_statement.path}".>
  end

  @retrieves[name] = retrieve_statement
  retrieve_statement.added_to_environment(true)

  return
end

#apply_config(package, config_name, backtrace) ⇒ Object 



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# File 'lib/fig/environment.rb', line 78

def apply_config(package, config_name, backtrace)
  if package.applied_config_names.member?(config_name)
    return
  end
  new_backtrace = backtrace ||
    Fig::Backtrace.new(
      nil,
      Fig::PackageDescriptor.new(package.name, package.version, config_name)
    )

  config = package[config_name]
  config.statements.each do
    |statement|
    apply_config_statement(package, statement, new_backtrace)
  end
  package.add_applied_config_name(config_name)

  return
end

#apply_config_statement(base_package, statement, backtrace) ⇒ Object

In order for this to work correctly, any Overrides need to be processed before any other kind of Statement. The Configuration class guarantees that those come first in its set of Statements.



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# File 'lib/fig/environment.rb', line 135

def apply_config_statement(base_package, statement, backtrace)
  case statement
  when Fig::Statement::Path
    prepend_variable(base_package, statement.name, statement.value, backtrace)
  when Fig::Statement::Set
    set_variable(base_package, statement.name, statement.value, backtrace)
  when Fig::Statement::Include
    include_config(base_package, statement.descriptor, backtrace)
  when Fig::Statement::Override
    backtrace.add_override(statement)
  when Fig::Statement::Command
    # Skip - has no effect on environment.
  else
    raise "Unexpected statement in a config block: #{statement.unparse('')}"
  end

  return
end

#check_unused_retrieves ⇒ Object 



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# File 'lib/fig/environment.rb', line 186

def check_unused_retrieves()
  @retrieves.keys().sort().each do
    |name|

    statement = @retrieves[name]
    if statement.loaded_but_not_referenced?
      Fig::Logging.warn \
        %Q<The #{name} variable was never referenced or didn't need expansion, so "#{statement.unparse('')}"#{statement.position_string} was ignored.>
    end
  end
end

#execute_config(base_package, descriptor, args, &block) ⇒ Object 



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# File 'lib/fig/environment.rb', line 106

def execute_config(base_package, descriptor, args, &block)
  config_name =
    descriptor.config || find_config_name_in_package(descriptor.name)

  name = descriptor.name || base_package.name
  package = lookup_package(
    name,
    descriptor.version,
    Fig::Backtrace.new(
      nil,
      Fig::PackageDescriptor.new(name, descriptor.version, config_name)
    )
  )

  command_statement = package[config_name].command_statement
  if command_statement
    execute_command(command_statement, args, package, nil, &block)
  else
    raise Fig::UserInputError.new(
      %Q<The "#{package.to_s}" package with the "#{config_name}" configuration does not contain a command.>
    )
  end

  return
end

#execute_shell(command) ⇒ Object 



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# File 'lib/fig/environment.rb', line 98

def execute_shell(command)
  @variables.with_environment do
    yield command.map{|arg| expand_command_line_argument(arg, nil, nil)}
  end

  return
end

#get_package(name) ⇒ Object 



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# File 'lib/fig/environment.rb', line 74

def get_package(name)
  return @packages[name]
end

#include_config(base_package, descriptor, backtrace) ⇒ Object 



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# File 'lib/fig/environment.rb', line 154

def include_config(base_package, descriptor, backtrace)
  resolved_descriptor = nil

  # Check to see if this include has been overridden.
  if backtrace
    override = backtrace.get_override(
      descriptor.name || base_package.name
    )
    if override
      resolved_descriptor =
        Fig::PackageDescriptor.new(
          descriptor.name, override, descriptor.config
        )
    end
  end
  resolved_descriptor ||= descriptor

  new_backtrace = Fig::Backtrace.new(backtrace, resolved_descriptor)
  package = lookup_package(
    resolved_descriptor.name || base_package.name,
    resolved_descriptor.version,
    new_backtrace
  )
  apply_config(
    package,
    resolved_descriptor.config || Fig::Package::DEFAULT_CONFIG,
    new_backtrace
  )

  return
end

#register_package(package) ⇒ Object 



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# File 'lib/fig/environment.rb', line 56

def register_package(package)
  name = package.name

  if get_package(name)
    raise_repository_error(
      name.nil? \
        ? %Q<There is already a package with the name "#{name}".> \
        : %q<There is already an unnamed package.>,
      nil,
      package
    )
  end

  @packages[name] = package

  return
end

#variables ⇒ Object 



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# File 'lib/fig/environment.rb', line 37

def variables
  return @variables.clone
end