The config package is responsible for loading and validating the configuration.



const UnknownVariableValue = "74D93920-ED26-11E3-AC10-0800200C9A66"

UnknownVariableValue is a sentinel value that can be used to denote that the value of a variable is unknown at this time. RawConfig uses this information to build up data about unknown keys.


var NameRegexp = regexp.MustCompile(`(?i)\A[A-Z0-9_][A-Z0-9\-\_]*\z`)

NameRegexp is the regular expression that all names (modules, providers, resources, etc.) must follow.


func Funcs

func Funcs() map[string]ast.Function

Funcs is the mapping of built-in functions for configuration.

func IsEmptyDir

func IsEmptyDir(root string) (bool, error)

IsEmptyDir returns true if the directory given has no Terraform configuration files.

func ProviderConfigName

func ProviderConfigName(t string, pcs []*ProviderConfig) string

ProviderConfigName returns the name of the provider configuration in the given mapping that maps to the proper provider configuration for this resource.


type AtlasConfig

type AtlasConfig struct {
	Name    string
	Include []string
	Exclude []string

AtlasConfig is the configuration for building in HashiCorp's Atlas.

type Backend

type Backend struct {
	Type      string
	RawConfig *RawConfig

	// Hash is a unique hash code representing the original configuration
	// of the backend. This won't be recomputed unless Rehash is called.
	Hash uint64

Backend is the configuration for the "backend" to use with Terraform. A backend is responsible for all major behavior of Terraform's core. The abstraction layer above the core (the "backend") allows for behavior such as remote operation.

func (*Backend) Rehash

func (b *Backend) Rehash() uint64

Rehash returns a unique content hash for this backend's configuration as a uint64 value.

func (*Backend) Validate

func (b *Backend) Validate() []error

type Config

type Config struct {
	// Dir is the path to the directory where this configuration was
	// loaded from. If it is blank, this configuration wasn't loaded from
	// any meaningful directory.
	Dir string

	Terraform       *Terraform
	Atlas           *AtlasConfig
	Modules         []*Module
	ProviderConfigs []*ProviderConfig
	Resources       []*Resource
	Variables       []*Variable
	Outputs         []*Output
	// contains filtered or unexported fields

Config is the configuration that comes from loading a collection of Terraform templates.

func Append

func Append(c1, c2 *Config) (*Config, error)

Append appends one configuration to another.

Append assumes that both configurations will not have conflicting variables, resources, etc. If they do, the problems will be caught in the validation phase.

It is possible that c1, c2 on their own are not valid. For example, a resource in c2 may reference a variable in c1. But together, they would be valid.

func LoadDir

func LoadDir(root string) (*Config, error)

LoadDir loads all the Terraform configuration files in a single directory and appends them together.

Special files known as "override files" can also be present, which are merged into the loaded configuration. That is, the non-override files are loaded first to create the configuration. Then, the overrides are merged into the configuration to create the final configuration.

Files are loaded in lexical order.

func LoadFile

func LoadFile(path string) (*Config, error)

LoadFile loads the Terraform configuration from a given file.

This file can be any format that Terraform recognizes, and import any other format that Terraform recognizes.

func LoadJSON

func LoadJSON(raw json.RawMessage) (*Config, error)

LoadJSON loads a single Terraform configuration from a given JSON document.

The document must be a complete Terraform configuration. This function will NOT try to load any additional modules so only the given document is loaded.

func Merge

func Merge(c1, c2 *Config) (*Config, error)

Merge merges two configurations into a single configuration.

Merge allows for the two configurations to have duplicate resources, because the resources will be merged. This differs from a single Config which must only have unique resources.

func (*Config) InterpolatedVariables

func (c *Config) InterpolatedVariables() map[string][]InterpolatedVariable

InterpolatedVariables is a helper that returns a mapping of all the interpolated variables within the configuration. This is used to verify references are valid in the Validate step.

func (*Config) TestString

func (c *Config) TestString() string

TestString is a Stringer-like function that outputs a string that can be used to easily compare multiple Config structures in unit tests.

This function has no practical use outside of unit tests and debugging.

func (*Config) Validate

func (c *Config) Validate() error

Validate does some basic semantic checking of the configuration.

type CountValueType

type CountValueType byte

CountValueType is the type of the count variable that is referenced.

const (
	CountValueInvalid CountValueType = iota

type CountVariable

type CountVariable struct {
	Type CountValueType
	// contains filtered or unexported fields

CountVariable is a variable for referencing information about the count.

func NewCountVariable

func NewCountVariable(key string) (*CountVariable, error)

func (*CountVariable) FullKey

func (c *CountVariable) FullKey() string

type ErrNoConfigsFound

type ErrNoConfigsFound struct {
	Dir string

ErrNoConfigsFound is the error returned by LoadDir if no Terraform configuration files were found in the given directory.

func (ErrNoConfigsFound) Error

func (e ErrNoConfigsFound) Error() string

type InterpolatedVariable

type InterpolatedVariable interface {
	FullKey() string

An InterpolatedVariable is a variable reference within an interpolation.

Implementations of this interface represents various sources where variables can come from: user variables, resources, etc.

func DetectVariables

func DetectVariables(root ast.Node) ([]InterpolatedVariable, error)

DetectVariables takes an AST root and returns all the interpolated variables that are detected in the AST tree.

func NewInterpolatedVariable

func NewInterpolatedVariable(v string) (InterpolatedVariable, error)

type Module

type Module struct {
	Name      string
	Source    string
	RawConfig *RawConfig

Module is a module used within a configuration.

This does not represent a module itself, this represents a module call-site within an existing configuration.

func (*Module) Id

func (r *Module) Id() string

A unique identifier for this module.

type ModuleVariable

type ModuleVariable struct {
	Name  string
	Field string
	// contains filtered or unexported fields

A ModuleVariable is a variable that is referencing the output of a module, such as "${}"

func NewModuleVariable

func NewModuleVariable(key string) (*ModuleVariable, error)

func (*ModuleVariable) FullKey

func (v *ModuleVariable) FullKey() string

func (*ModuleVariable) GoString

func (v *ModuleVariable) GoString() string

type Output

type Output struct {
	Name        string
	DependsOn   []string
	Description string
	Sensitive   bool
	RawConfig   *RawConfig

Output is an output defined within the configuration. An output is resulting data that is highlighted by Terraform when finished. An output marked Sensitive will be output in a masked form following application, but will still be available in state.

type PathValueType

type PathValueType byte
const (
	PathValueInvalid PathValueType = iota

type PathVariable

type PathVariable struct {
	Type PathValueType
	// contains filtered or unexported fields

A PathVariable is a variable that references path information about the module.

func NewPathVariable

func NewPathVariable(key string) (*PathVariable, error)

func (*PathVariable) FullKey

func (v *PathVariable) FullKey() string

type ProviderConfig

type ProviderConfig struct {
	Name      string
	Alias     string
	RawConfig *RawConfig

ProviderConfig is the configuration for a resource provider.

For example, Terraform needs to set the AWS access keys for the AWS resource provider.

func (*ProviderConfig) FullName

func (c *ProviderConfig) FullName() string

func (*ProviderConfig) GoString

func (c *ProviderConfig) GoString() string

type Provisioner

type Provisioner struct {
	Type      string
	RawConfig *RawConfig
	ConnInfo  *RawConfig

	When      ProvisionerWhen
	OnFailure ProvisionerOnFailure

Provisioner is a configured provisioner step on a resource.

func (*Provisioner) Copy

func (p *Provisioner) Copy() *Provisioner

Copy returns a copy of this Provisioner

type ProvisionerOnFailure

type ProvisionerOnFailure int

ProvisionerOnFailure is an enum for valid values for on_failure options for provisioners.

const (
	ProvisionerOnFailureInvalid ProvisionerOnFailure = iota

func (ProvisionerOnFailure) String

func (v ProvisionerOnFailure) String() string

type ProvisionerWhen

type ProvisionerWhen int

ProvisionerWhen is an enum for valid values for when to run provisioners.

const (
	ProvisionerWhenInvalid ProvisionerWhen = iota

func (ProvisionerWhen) String

func (v ProvisionerWhen) String() string

type RawConfig

type RawConfig struct {
	Key            string
	Raw            map[string]interface{}
	Interpolations []ast.Node
	Variables      map[string]InterpolatedVariable
	// contains filtered or unexported fields

RawConfig is a structure that holds a piece of configuration where the overall structure is unknown since it will be used to configure a plugin or some other similar external component.

RawConfigs can be interpolated with variables that come from other resources, user variables, etc.

RawConfig supports a query-like interface to request information from deep within the structure.

func NewRawConfig

func NewRawConfig(raw map[string]interface{}) (*RawConfig, error)

NewRawConfig creates a new RawConfig structure and populates the publicly readable struct fields.

func TestRawConfig

func TestRawConfig(t *testing.T, c map[string]interface{}) *RawConfig

TestRawConfig is used to create a RawConfig for testing.

func (*RawConfig) Config

func (r *RawConfig) Config() map[string]interface{}

Config returns the entire configuration with the variables interpolated from any call to Interpolate.

If any interpolated variables are unknown (value set to UnknownVariableValue), the first non-container (map, slice, etc.) element will be removed from the config. The keys of unknown variables can be found using the UnknownKeys function.

By pruning out unknown keys from the configuration, the raw structure will always successfully decode into its ultimate structure using something like mapstructure.

func (*RawConfig) Copy

func (r *RawConfig) Copy() *RawConfig

Copy returns a copy of this RawConfig, uninterpolated.

func (*RawConfig) GobDecode

func (r *RawConfig) GobDecode(b []byte) error

See GobEncode

func (*RawConfig) GobEncode

func (r *RawConfig) GobEncode() ([]byte, error)

GobEncode is a custom Gob encoder to use so that we only include the raw configuration. Interpolated variables and such are lost and the tree of interpolated variables is recomputed on decode, since it is referentially transparent.

func (*RawConfig) Interpolate

func (r *RawConfig) Interpolate(vs map[string]ast.Variable) error

Interpolate uses the given mapping of variable values and uses those as the values to replace any variables in this raw configuration.

Any prior calls to Interpolate are replaced with this one.

If a variable key is missing, this will panic.

func (*RawConfig) Merge

func (r *RawConfig) Merge(other *RawConfig) *RawConfig

Merge merges another RawConfig into this one (overriding any conflicting values in this config) and returns a new config. The original config is not modified.

func (*RawConfig) RawMap

func (r *RawConfig) RawMap() map[string]interface{}

RawMap returns a copy of the RawConfig.Raw map.

func (*RawConfig) UnknownKeys

func (r *RawConfig) UnknownKeys() []string

UnknownKeys returns the keys of the configuration that are unknown because they had interpolated variables that must be computed.

func (*RawConfig) Value

func (r *RawConfig) Value() interface{}

Value returns the value of the configuration if this configuration has a Key set. If this does not have a Key set, nil will be returned.

type Resource

type Resource struct {
	Mode         ResourceMode // which operations the resource supports
	Name         string
	Type         string
	RawCount     *RawConfig
	RawConfig    *RawConfig
	Provisioners []*Provisioner
	Provider     string
	DependsOn    []string
	Lifecycle    ResourceLifecycle

A resource represents a single Terraform resource in the configuration. A Terraform resource is something that supports some or all of the usual "create, read, update, delete" operations, depending on the given Mode.

func (*Resource) Copy

func (r *Resource) Copy() *Resource

Copy returns a copy of this Resource. Helpful for avoiding shared config pointers across multiple pieces of the graph that need to do interpolation.

func (*Resource) Count

func (r *Resource) Count() (int, error)

Count returns the count of this resource.

func (*Resource) Id

func (r *Resource) Id() string

A unique identifier for this resource.

type ResourceLifecycle

type ResourceLifecycle struct {
	CreateBeforeDestroy bool     `mapstructure:"create_before_destroy"`
	PreventDestroy      bool     `mapstructure:"prevent_destroy"`
	IgnoreChanges       []string `mapstructure:"ignore_changes"`

ResourceLifecycle is used to store the lifecycle tuning parameters to allow customized behavior

func (*ResourceLifecycle) Copy

func (r *ResourceLifecycle) Copy() *ResourceLifecycle

Copy returns a copy of this ResourceLifecycle

type ResourceMode

type ResourceMode int

go:generate stringer -type=ResourceMode -output=resource_mode_string.go resource_mode.go

const (
	ManagedResourceMode ResourceMode = iota

func (ResourceMode) String

func (i ResourceMode) String() string

func (ResourceMode) Taintable

func (m ResourceMode) Taintable() bool

type ResourceVariable

type ResourceVariable struct {
	Mode  ResourceMode
	Type  string // Resource type, i.e. "aws_instance"
	Name  string // Resource name
	Field string // Resource field

	Multi bool // True if multi-variable:*.id
	Index int  // Index for multi-variable: == 1
	// contains filtered or unexported fields

A ResourceVariable is a variable that is referencing the field of a resource, such as "${}"

func NewResourceVariable

func NewResourceVariable(key string) (*ResourceVariable, error)

func (*ResourceVariable) FullKey

func (v *ResourceVariable) FullKey() string

func (*ResourceVariable) ResourceId

func (v *ResourceVariable) ResourceId() string

type SelfVariable

type SelfVariable struct {
	Field string
	// contains filtered or unexported fields

SelfVariable is a variable that is referencing the same resource it is running on: "${self.address}"

func NewSelfVariable

func NewSelfVariable(key string) (*SelfVariable, error)

func (*SelfVariable) FullKey

func (v *SelfVariable) FullKey() string

func (*SelfVariable) GoString

func (v *SelfVariable) GoString() string

type SimpleVariable

type SimpleVariable struct {
	Key string

SimpleVariable is an unprefixed variable, which can show up when users have strings they are passing down to resources that use interpolation internally. The template_file resource is an example of this.

func NewSimpleVariable

func NewSimpleVariable(key string) (*SimpleVariable, error)

func (*SimpleVariable) FullKey

func (v *SimpleVariable) FullKey() string

func (*SimpleVariable) GoString

func (v *SimpleVariable) GoString() string

type Terraform

type Terraform struct {
	RequiredVersion string   `hcl:"required_version"` // Required Terraform version (constraint)
	Backend         *Backend // See Backend struct docs

Terraform is the Terraform meta-configuration that can be present in configuration files for configuring Terraform itself.

func (*Terraform) Merge

func (t *Terraform) Merge(t2 *Terraform)

Merge t with t2. Any conflicting fields are overwritten by t2.

func (*Terraform) Validate

func (t *Terraform) Validate() []error

Validate performs the validation for just the Terraform configuration.

type TerraformVariable

type TerraformVariable struct {
	Field string
	// contains filtered or unexported fields

TerraformVariable is a "terraform."-prefixed variable used to access metadata about the Terraform run.

func NewTerraformVariable

func NewTerraformVariable(key string) (*TerraformVariable, error)

func (*TerraformVariable) FullKey

func (v *TerraformVariable) FullKey() string

func (*TerraformVariable) GoString

func (v *TerraformVariable) GoString() string

type UserVariable

type UserVariable struct {
	Name string
	Elem string
	// contains filtered or unexported fields

A UserVariable is a variable that is referencing a user variable that is inputted from outside the configuration. This looks like "${}"

func NewUserVariable

func NewUserVariable(key string) (*UserVariable, error)

func (*UserVariable) FullKey

func (v *UserVariable) FullKey() string

func (*UserVariable) GoString

func (v *UserVariable) GoString() string

type Variable

type Variable struct {
	Name         string
	DeclaredType string `mapstructure:"type"`
	Default      interface{}
	Description  string

Variable is a variable defined within the configuration.

func (*Variable) Merge

func (v *Variable) Merge(v2 *Variable) *Variable

Merge merges two variables to create a new third variable.

func (*Variable) Required

func (v *Variable) Required() bool

Required tests whether a variable is required or not.

func (*Variable) Type

func (v *Variable) Type() VariableType

Type returns the type of variable this is.

func (*Variable) ValidateTypeAndDefault

func (v *Variable) ValidateTypeAndDefault() error

ValidateTypeAndDefault ensures that default variable value is compatible with the declared type (if one exists), and that the type is one which is known to Terraform

type VariableType

type VariableType byte

VariableType is the type of value a variable is holding, and returned by the Type() function on variables.

const (
	VariableTypeUnknown VariableType = iota

func (VariableType) Printable

func (v VariableType) Printable() string


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