hcl2: add general kv store that could be used anywhere

hcl2template/types.kv.go

@@ -0,0 +1,8 @@
+//go:generate mapstructure-to-hcl2 -type KeyValue
+
+package hcl2template
+
+type KeyValue struct {
+	Key   string
+	Value string
+}

hcl2template/types.kv.hcl2spec.go

@@ -0,0 +1,32 @@
+// Code generated by "mapstructure-to-hcl2 -type KeyValue"; DO NOT EDIT.
+package hcl2template
+
+import (
+	"github.com/hashicorp/hcl/v2/hcldec"
+	"github.com/zclconf/go-cty/cty"
+)
+
+// FlatKeyValue is an auto-generated flat version of KeyValue.
+// Where the contents of a field with a `mapstructure:,squash` tag are bubbled up.
+type FlatKeyValue struct {
+	Key   *string `cty:"key"`
+	Value *string `cty:"value"`
+}
+
+// FlatMapstructure returns a new FlatKeyValue.
+// FlatKeyValue is an auto-generated flat version of KeyValue.
+// Where the contents a fields with a `mapstructure:,squash` tag are bubbled up.
+func (*KeyValue) FlatMapstructure() interface{ HCL2Spec() map[string]hcldec.Spec } {
+	return new(FlatKeyValue)
+}
+
+// HCL2Spec returns the hcl spec of a KeyValue.
+// This spec is used by HCL to read the fields of KeyValue.
+// The decoded values from this spec will then be applied to a FlatKeyValue.
+func (*FlatKeyValue) HCL2Spec() map[string]hcldec.Spec {
+	s := map[string]hcldec.Spec{
+		"key":   &hcldec.AttrSpec{Name: "key", Type: cty.String, Required: false},
+		"value": &hcldec.AttrSpec{Name: "value", Type: cty.String, Required: false},
+	}
+	return s
+}