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terraform: transform module variables does parent first

This commit is contained in:
Mitchell Hashimoto 2016-09-23 17:20:25 -07:00
parent 924f7a49e0
commit 9ac4ee4b52
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GPG Key ID: 744E147AA52F5B0A
1 changed files with 8 additions and 18 deletions
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26
terraform/transform_module_variable.go
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@ -28,21 +28,16 @@ func (t *ModuleVariableTransformer) transform(g *Graph, parent, m *module.Tree)
return nil
}
// If we have no parent, then don't do anything. This is because
// we need to be able to get the set value from the module declaration.
if err := t.transformSingle(g, parent, m); err != nil {
return nil
// If we have a parent, we can determine if a module variable is being
// used, so we transform this.
if parent != nil {
if err := t.transformSingle(g, parent, m); err != nil {
return err
}
}
// Transform all the children. This has to be _after_ the above
// since children can reference parent variables but parents can't
// access children. Example:
//
// module foo { value = "${var.foo}" }
//
// The "value" var in "foo" (a child) is accessing the "foo" bar
// in the parent (current module). However, there is no way for the
// current module to reference a variable in the child module.
// Transform all the children. This must be done AFTER the transform
// above since child module variables can reference parent module variables.
for _, c := range m.Children() {
if err := t.transform(g, m, c); err != nil {
return err
@ -53,11 +48,6 @@ func (t *ModuleVariableTransformer) transform(g *Graph, parent, m *module.Tree)
}
func (t *ModuleVariableTransformer) transformSingle(g *Graph, parent, m *module.Tree) error {
// If we have no parent, we can't determine if the parent uses our variables
if parent == nil {
return nil
}
// If we have no vars, we're done!
vars := m.Config().Variables
if len(vars) == 0 {