check for nil config map (#10730)

command/hcl2_upgrade.go

@@ -1033,7 +1033,12 @@ func writeProvisioner(typeName string, provisioner *template.Provisioner) []byte
 	provisionerContent := hclwrite.NewEmptyFile()
 	body := provisionerContent.Body()
 	block := body.AppendNewBlock(typeName, []string{provisioner.Type})
+
 	cfg := provisioner.Config
+	if cfg == nil {
+		cfg = map[string]interface{}{}
+	}
+
 	if len(provisioner.Except) > 0 {
 		cfg["except"] = provisioner.Except
 	}
@@ -1086,6 +1091,10 @@ func (p *PostProcessorParser) Parse(tpl *template.Template) error {
 				ppBody.SetAttributeValue("keep_input_artifact", cty.BoolVal(*pp.KeepInputArtifact))
 			}
 			cfg := pp.Config
+			if cfg == nil {
+				cfg = map[string]interface{}{}
+			}
+
 			if len(pp.Except) > 0 {
 				cfg["except"] = pp.Except
 			}

command/test-fixtures/hcl2_upgrade/complete/expected.pkr.hcl

@@ -172,6 +172,11 @@ source "amazon-ebs" "named_builder" {
 build {
   sources = ["source.amazon-ebs.autogenerated_1", "source.amazon-ebs.named_builder"]
 
+  provisioner "breakpoint" {
+    only         = ["amazon-ebs"]
+    pause_before = "5s"
+  }
+
   provisioner "shell" {
     except      = ["amazon-ebs"]
     inline      = ["echo ${var.secret_account}", "echo ${build.ID}", "echo ${build.SSHPublicKey} | head -c 14", "echo ${path.root} is not ${path.cwd}", "echo ${packer.version}", "echo ${uuidv4()}"]
@@ -277,5 +282,7 @@ build {
         Description = "packer amazon-import ${local.timestamp}"
       }
     }
+    post-processor "compress" {
+    }
   }
 }

command/test-fixtures/hcl2_upgrade/complete/input.json

@@ -116,6 +116,13 @@
         }
     ],
     "provisioners": [
+        {
+            "type": "breakpoint",
+            "only": [
+                "amazon-ebs"
+            ],
+            "pause_before": "5s"
+        },
         {
             "type": "shell",
             "except": [
@@ -230,6 +237,9 @@
                 "tags": {
                     "Description": "packer amazon-import {{timestamp}}"
                 }
+            },
+            {
+                "type": "compress"
             }
         ]
     ]