terraform: string through the context meta

terraform/context_apply_test.go

@@ -8069,3 +8069,33 @@ func TestContext2Apply_dataDependsOn(t *testing.T) {
 		t.Fatalf("bad:\n%s", strings.TrimSpace(state.String()))
 	}
 }
+
+func TestContext2Apply_terraformEnv(t *testing.T) {
+	m := testModule(t, "apply-terraform-env")
+	p := testProvider("aws")
+	p.ApplyFn = testApplyFn
+	p.DiffFn = testDiffFn
+
+	ctx := testContext2(t, &ContextOpts{
+		Meta:   &ContextMeta{Env: "foo"},
+		Module: m,
+		Providers: map[string]ResourceProviderFactory{
+			"aws": testProviderFuncFixed(p),
+		},
+	})
+
+	if _, err := ctx.Plan(); err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	state, err := ctx.Apply()
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	actual := state.RootModule().Outputs["output"]
+	expected := "foo"
+	if actual == nil || actual.Value != expected {
+		t.Fatalf("bad: \n%s", actual)
+	}
+}

terraform/graph_walk_context.go

@@ -84,6 +84,7 @@ func (w *ContextGraphWalker) EnterPath(path []string) EvalContext {
 		StateLock:           &w.Context.stateLock,
 		Interpolater: &Interpolater{
 			Operation:          w.Operation,
+			Meta:               w.Context.meta,
 			Module:             w.Context.module,
 			State:              w.Context.state,
 			StateLock:          &w.Context.stateLock,

terraform/shadow_context.go

@@ -46,6 +46,7 @@ func newShadowContext(c *Context) (*Context, *Context, Shadow) {
 		destroy:    c.destroy,
 		diff:       c.diff.DeepCopy(),
 		hooks:      nil,
+		meta:       c.meta,
 		module:     c.module,
 		state:      c.state.DeepCopy(),
 		targets:    targetRaw.([]string),
@@ -77,6 +78,7 @@ func newShadowContext(c *Context) (*Context, *Context, Shadow) {
 		diff:    c.diff,
 		// diffLock - no copy
 		hooks:  c.hooks,
+		meta:   c.meta,
 		module: c.module,
 		sh:     c.sh,
 		state:  c.state,

terraform/test-fixtures/apply-terraform-env/main.tf

@@ -0,0 +1,3 @@
+output "output" {
+    value = "${terraform.env}"
+}