vendor/github.com/hashicorp/terraform/terraform/graph_builder_import.go

   1 package terraform
   2
   3 import (
   4         "github.com/hashicorp/terraform/config/module"
   5         "github.com/hashicorp/terraform/dag"
   6 )
   7
   8 // ImportGraphBuilder implements GraphBuilder and is responsible for building
   9 // a graph for importing resources into Terraform. This is a much, much
  10 // simpler graph than a normal configuration graph.
  11 type ImportGraphBuilder struct {
  12         // ImportTargets are the list of resources to import.
  13         ImportTargets []*ImportTarget
  14
  15         // Module is the module to add to the graph. See ImportOpts.Module.
  16         Module *module.Tree
  17
  18         // Providers is the list of providers supported.
  19         Providers []string
  20 }
  21
  22 // Build builds the graph according to the steps returned by Steps.
  23 func (b *ImportGraphBuilder) Build(path []string) (*Graph, error) {
  24         return (&BasicGraphBuilder{
  25                 Steps:    b.Steps(),
  26                 Validate: true,
  27                 Name:     "ImportGraphBuilder",
  28         }).Build(path)
  29 }
  30
  31 // Steps returns the ordered list of GraphTransformers that must be executed
  32 // to build a complete graph.
  33 func (b *ImportGraphBuilder) Steps() []GraphTransformer {
  34         // Get the module. If we don't have one, we just use an empty tree
  35         // so that the transform still works but does nothing.
  36         mod := b.Module
  37         if mod == nil {
  38                 mod = module.NewEmptyTree()
  39         }
  40
  41         // Custom factory for creating providers.
  42         concreteProvider := func(a *NodeAbstractProvider) dag.Vertex {
  43                 return &NodeApplyableProvider{
  44                         NodeAbstractProvider: a,
  45                 }
  46         }
  47
  48         steps := []GraphTransformer{
  49                 // Create all our resources from the configuration and state
  50                 &ConfigTransformer{Module: mod},
  51
  52                 // Add the import steps
  53                 &ImportStateTransformer{Targets: b.ImportTargets},
  54
  55                 TransformProviders(b.Providers, concreteProvider, mod),
  56
  57                 // This validates that the providers only depend on variables
  58                 &ImportProviderValidateTransformer{},
  59
  60                 // Close opened plugin connections
  61                 &CloseProviderTransformer{},
  62
  63                 // Single root
  64                 &RootTransformer{},
  65
  66                 // Optimize
  67                 &TransitiveReductionTransformer{},
  68         }
  69
  70         return steps
  71 }