From 97c56347a147f6122e158f623945385b560e1a0a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gr=C3=A9goire=20Pineau?= <lyrixx@lyrixx.info>
Date: Wed, 4 Mar 2015 19:57:03 +0100
Subject: [PATCH] Better error reporting when a config key in template is
 Unknown
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This patch will allow to fix the following bug much faster:

```
1 error(s) occurred:

* Unknown configuration key: output_directory
```

Related configuration:

```
"output_directory ": "build/sl_base/",
```

After the patch, the error reporting will be:

```
1 error(s) occurred:

* Unknown configuration key: "output_directory¤"
```
---
 common/config.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/common/config.go b/common/config.go
index 4a56cc356..72b3bdd27 100644
--- a/common/config.go
+++ b/common/config.go
@@ -33,7 +33,7 @@ func CheckUnusedConfig(md *mapstructure.Metadata) *packer.MultiError {
 		for _, unused := range md.Unused {
 			if unused != "type" && !strings.HasPrefix(unused, "packer_") {
 				errs = append(
-					errs, fmt.Errorf("Unknown configuration key: %s", unused))
+					errs, fmt.Errorf("Unknown configuration key: %q", unused))
 			}
 		}
 	}