From cdde5cbbe2963753e549e27cf80d77f61c13f5d0 Mon Sep 17 00:00:00 2001
From: Megan Marsh <megan@hashicorp.com>
Date: Fri, 8 Oct 2021 11:33:52 -0700
Subject: [PATCH] fix source accessor to allow use in source block

---
 hcl2template/types.source.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/hcl2template/types.source.go b/hcl2template/types.source.go
index f877e7fad..e7ee39dae 100644
--- a/hcl2template/types.source.go
+++ b/hcl2template/types.source.go
@@ -110,6 +110,12 @@ func (cfg *PackerConfig) startBuilder(source SourceUseBlock, ectx *hcl.EvalConte
 	}
 
 	body := source.Body
+	// Add known values to source accessor in eval context.
+	ectx.Variables[sourcesAccessor] = cty.ObjectVal(map[string]cty.Value{
+		"type": cty.StringVal(source.Type),
+		"name": cty.StringVal(source.Name),
+	})
+
 	decoded, moreDiags := decodeHCL2Spec(body, ectx, builder)
 	diags = append(diags, moreDiags...)
 	if moreDiags.HasErrors() {