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

   1 package terraform
   2
   3 import (
   4         "log"
   5
   6         "github.com/hashicorp/terraform/addrs"
   7         "github.com/hashicorp/terraform/configs"
   8         "github.com/hashicorp/terraform/states"
   9 )
  10
  11 // OrphanOutputTransformer finds the outputs that aren't present
  12 // in the given config that are in the state and adds them to the graph
  13 // for deletion.
  14 type OrphanOutputTransformer struct {
  15         Config *configs.Config // Root of config tree
  16         State  *states.State   // State is the root state
  17 }
  18
  19 func (t *OrphanOutputTransformer) Transform(g *Graph) error {
  20         if t.State == nil {
  21                 log.Printf("[DEBUG] No state, no orphan outputs")
  22                 return nil
  23         }
  24
  25         for _, ms := range t.State.Modules {
  26                 if err := t.transform(g, ms); err != nil {
  27                         return err
  28                 }
  29         }
  30         return nil
  31 }
  32
  33 func (t *OrphanOutputTransformer) transform(g *Graph, ms *states.Module) error {
  34         if ms == nil {
  35                 return nil
  36         }
  37
  38         moduleAddr := ms.Addr
  39
  40         // Get the config for this path, which is nil if the entire module has been
  41         // removed.
  42         var outputs map[string]*configs.Output
  43         if c := t.Config.DescendentForInstance(moduleAddr); c != nil {
  44                 outputs = c.Module.Outputs
  45         }
  46
  47         // An output is "orphaned" if it's present in the state but not declared
  48         // in the configuration.
  49         for name := range ms.OutputValues {
  50                 if _, exists := outputs[name]; exists {
  51                         continue
  52                 }
  53
  54                 g.Add(&NodeOutputOrphan{
  55                         Addr: addrs.OutputValue{Name: name}.Absolute(moduleAddr),
  56                 })
  57         }
  58
  59         return nil
  60 }