github.com/paybyphone/terraform@v0.9.5-0.20170613192930-9706042ddd51/terraform/transform_orphan_output.go (about)

     1  package terraform
     2  
     3  import (
     4  	"log"
     5  
     6  	"github.com/hashicorp/terraform/config"
     7  	"github.com/hashicorp/terraform/config/module"
     8  )
     9  
    10  // OrphanOutputTransformer finds the outputs that aren't present
    11  // in the given config that are in the state and adds them to the graph
    12  // for deletion.
    13  type OrphanOutputTransformer struct {
    14  	Module *module.Tree // Root module
    15  	State  *State       // State is the root state
    16  }
    17  
    18  func (t *OrphanOutputTransformer) Transform(g *Graph) error {
    19  	if t.State == nil {
    20  		log.Printf("[DEBUG] No state, no orphan outputs")
    21  		return nil
    22  	}
    23  
    24  	return t.transform(g, t.Module)
    25  }
    26  
    27  func (t *OrphanOutputTransformer) transform(g *Graph, m *module.Tree) error {
    28  	// Get our configuration, and recurse into children
    29  	var c *config.Config
    30  	if m != nil {
    31  		c = m.Config()
    32  		for _, child := range m.Children() {
    33  			if err := t.transform(g, child); err != nil {
    34  				return err
    35  			}
    36  		}
    37  	}
    38  
    39  	// Get the state. If there is no state, then we have no orphans!
    40  	path := normalizeModulePath(m.Path())
    41  	state := t.State.ModuleByPath(path)
    42  	if state == nil {
    43  		return nil
    44  	}
    45  
    46  	// Make a map of the valid outputs
    47  	valid := make(map[string]struct{})
    48  	for _, o := range c.Outputs {
    49  		valid[o.Name] = struct{}{}
    50  	}
    51  
    52  	// Go through the outputs and find the ones that aren't in our config.
    53  	for n, _ := range state.Outputs {
    54  		// If it is in the valid map, then ignore
    55  		if _, ok := valid[n]; ok {
    56  			continue
    57  		}
    58  
    59  		// Orphan!
    60  		g.Add(&NodeOutputOrphan{OutputName: n, PathValue: path})
    61  	}
    62  
    63  	return nil
    64  }