continue and realise and unused undefaulted value triggers an error

hcl2template/testdata/complete/build.pkr.hcl

@@ -8,7 +8,7 @@ build {
     provisioner "shell" {
         name     = "provisioner that does something"
         not_squashed = var.foo
-        string   = "string${var.proxmox_username}"
+        string   = "string"
         int      = "${41 + 1}"
         int64    = "${42 + 1}"
         bool     = "true"

hcl2template/testdata/complete/variables.pkr.hcl

@@ -10,10 +10,6 @@ variable "image_id" {
   default = "image-id-default"
 }
 
-variable "proxmox_username" {
-  type = string
-}
-
 variable "port" {
   type = number
   default = 42

hcl2template/types.packer_config_test.go

@@ -21,14 +21,23 @@ func TestParser_complete(t *testing.T) {
 			&PackerConfig{
 				Basedir: "testdata/complete",
 				InputVariables: Variables{
-					"foo":                     &Variable{},
-					"image_id":                &Variable{},
-					"port":                    &Variable{},
-					"availability_zone_names": &Variable{},
-					"proxmox_username":        &Variable{},
+					"foo": &Variable{
+						Name: "foo",
+					},
+					"image_id": &Variable{
+						Name: "image_id",
+					},
+					"port": &Variable{
+						Name: "port",
+					},
+					"availability_zone_names": &Variable{
+						Name: "availability_zone_names",
+					},
 				},
 				LocalVariables: Variables{
-					"feefoo": &Variable{},
+					"feefoo": &Variable{
+						Name: "feefoo",
+					},
 				},
 				Sources: map[SourceRef]*SourceBlock{
 					refVBIsoUbuntu1204: {Type: "virtualbox-iso", Name: "ubuntu-1204"},

hcl2template/types.variables.go

@@ -31,6 +31,8 @@ type Variable struct {
 	// declaration, the type of the default variable will be used. This will
 	// allow to ensure that users set this variable correctly.
 	Type cty.Type
+	// Common name of the variable
+	Name string
 	// Description of the variable
 	Description string
 	// When Sensitive is set to true Packer will try it best to hide/obfuscate
@@ -59,7 +61,7 @@ func (v *Variable) Value() (cty.Value, *hcl.Diagnostic) {
 
 	return cty.UnknownVal(v.Type), &hcl.Diagnostic{
 		Severity: hcl.DiagError,
-		Summary:  "Unset variable",
+		Summary:  fmt.Sprintf("Unset variable %q", v.Name),
 		Detail: "A used variable must be set or have a default value; see " +
 			"https://packer.io/docs/configuration/from-1.5/syntax.html for details.",
 		Context: v.block.DefRange.Ptr(),
@@ -74,7 +76,9 @@ func (variables Variables) Values() (map[string]cty.Value, hcl.Diagnostics) {
 	for k, v := range variables {
 		var diag *hcl.Diagnostic
 		res[k], diag = v.Value()
-		diags = append(diags, diag)
+		if diag != nil {
+			diags = append(diags, diag)
+		}
 	}
 	return res, diags
 }
@@ -107,8 +111,10 @@ func (variables *Variables) decodeConfigMap(block *hcl.Block, ectx *hcl.EvalCont
 			continue
 		}
 		(*variables)[key] = &Variable{
+			Name:         key,
 			DefaultValue: value,
 			Type:         value.Type(),
+			block:        block,
 		}
 	}
 
@@ -142,7 +148,10 @@ func (variables *Variables) decodeConfig(block *hcl.Block, ectx *hcl.EvalContext
 		return diags
 	}
 
+	name := block.Labels[0]
+
 	res := &Variable{
+		Name:        name,
 		Description: b.Description,
 		Sensitive:   b.Sensitive,
 		block:       block,
@@ -200,7 +209,7 @@ func (variables *Variables) decodeConfig(block *hcl.Block, ectx *hcl.EvalContext
 		})
 	}
 
-	(*variables)[block.Labels[0]] = res
+	(*variables)[name] = res
 
 	return diags
 }

hcl2template/types.variables_test.go

@@ -23,15 +23,17 @@ func TestParse_variables(t *testing.T) {
 			&PackerConfig{
 				Basedir: filepath.Join("testdata", "variables"),
 				InputVariables: Variables{
-					"image_name": &Variable{},
-					"key":        &Variable{},
-					"my_secret":  &Variable{},
-					"image_id":   &Variable{},
-					"port":       &Variable{},
+					"image_name": &Variable{Name: "image_name"},
+					"key":        &Variable{Name: "key"},
+					"my_secret":  &Variable{Name: "my_secret"},
+					"image_id":   &Variable{Name: "image_id"},
+					"port":       &Variable{Name: "port"},
 					"availability_zone_names": &Variable{
+						Name:        "availability_zone_names",
 						Description: fmt.Sprintln("Describing is awesome ;D"),
 					},
 					"super_secret_password": &Variable{
+						Name:        "super_secret_password",
 						Sensitive:   true,
 						Description: fmt.Sprintln("Handle with care plz"),
 					},
@@ -51,7 +53,9 @@ func TestParse_variables(t *testing.T) {
 			&PackerConfig{
 				Basedir: filepath.Join("testdata", "variables"),
 				InputVariables: Variables{
-					"boolean_value": &Variable{},
+					"boolean_value": &Variable{
+						Name: "boolean_value",
+					},
 				},
 			},
 			true, true,
@@ -64,7 +68,9 @@ func TestParse_variables(t *testing.T) {
 			&PackerConfig{
 				Basedir: filepath.Join("testdata", "variables"),
 				InputVariables: Variables{
-					"boolean_value": &Variable{},
+					"boolean_value": &Variable{
+						Name: "boolean_value",
+					},
 				},
 			},
 			true, true,
@@ -77,23 +83,27 @@ func TestParse_variables(t *testing.T) {
 			&PackerConfig{
 				Basedir: filepath.Join("testdata", "variables"),
 				InputVariables: Variables{
-					"broken_type": &Variable{},
+					"broken_type": &Variable{
+						Name: "broken_type",
+					},
 				},
 			},
 			true, true,
 			[]packer.Build{},
 			false,
 		},
-		{"invalid default type",
+		{"unknown key",
 			defaultParser,
 			parseTestArgs{"testdata/variables/unknown_key.pkr.hcl", nil},
 			&PackerConfig{
 				Basedir: filepath.Join("testdata", "variables"),
 				InputVariables: Variables{
-					"broken_type": &Variable{},
+					"broken_type": &Variable{
+						Name: "broken_type",
+					},
 				},
 			},
-			true, false,
+			true, true,
 			[]packer.Build{},
 			false,
 		},
@@ -103,7 +113,9 @@ func TestParse_variables(t *testing.T) {
 			&PackerConfig{
 				Basedir: filepath.Join("testdata", "variables"),
 				InputVariables: Variables{
-					"foo": &Variable{},
+					"foo": &Variable{
+						Name: "foo",
+					},
 				},
 				Sources: map[SourceRef]*SourceBlock{
 					SourceRef{"null", "null-builder"}: &SourceBlock{
@@ -117,7 +129,7 @@ func TestParse_variables(t *testing.T) {
 					},
 				},
 			},
-			false, false,
+			true, true,
 			[]packer.Build{},
 			true,
 		},