From f536e351fa34748cb4fe96c17df23d027566159e Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Tue, 27 Aug 2013 13:40:19 -0700
Subject: [PATCH] command/build: "end" sentinel in artifact machine-readable
 output

---
 CHANGELOG.md                                             | 2 ++
 command/build/command.go                                 | 1 +
 .../docs/machine-readable/command-build.html.markdown    | 9 +++++++++
 3 files changed, 12 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 27fe5f0ee..14f1b1105 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,8 @@ IMPROVEMENTS:
 * core: Output message when Ctrl-C received that we're cleaning up. [GH-338]
 * builder/amazon: Tagging now works with all amazon builder types.
 * command/build: Machine-readable output now contains build errors, if any.
+* command/build: An "end" sentinel is outputted in machine-readable output
+  for artifact listing so it is easier to know when it is over.
 
 BUG FIXES:
 
diff --git a/command/build/command.go b/command/build/command.go
index 69d809927..a878627a5 100644
--- a/command/build/command.go
+++ b/command/build/command.go
@@ -235,6 +235,7 @@ func (c Command) Run(env packer.Environment, args []string) int {
 					ui.Machine("artifact", iStr, "nil")
 				}
 
+				ui.Machine("artifact", iStr, "end")
 				env.Ui().Say(message.String())
 			}
 		}
diff --git a/website/source/docs/machine-readable/command-build.html.markdown b/website/source/docs/machine-readable/command-build.html.markdown
index 6e56ba63d..848d65c90 100644
--- a/website/source/docs/machine-readable/command-build.html.markdown
+++ b/website/source/docs/machine-readable/command-build.html.markdown
@@ -61,6 +61,15 @@ of `packer build`.
 		</p>
 	</dd>
 
+	<dt>artifact subtype: end (0)</dt>
+	<dd>
+		<p>
+		The last machine-readable output line outputted for an artifact.
+		This is a sentinel value so you know that no more data related to
+		the targetted artifact will be outputted.
+		</p>
+	</dd>
+
 	<dt>artifact subtype: file (2)</dt>
 	<dd>
 		<p>