From b035a0a6194b71e2e073efc008edd4670bb6b53c Mon Sep 17 00:00:00 2001
From: "David A. Harding" <dave@dtrt.org>
Date: Fri, 4 Sep 2015 13:08:00 -0400
Subject: [PATCH] Prevent site indexing for preview builds

---
 README.md                  | 21 +++++++++++++++++++++
 _build/update_txpreview.sh |  3 +++
 robots.txt                 | 11 +++++++++++
 3 files changed, 35 insertions(+)

diff --git a/README.md b/README.md
index b48c410d..e820ca5a 100644
--- a/README.md
+++ b/README.md
@@ -297,6 +297,27 @@ run if the API site is running slow.
 
 For a list of languages, look in the `_translations` directory.
 
+#### Publishing Previews
+
+You can publish your previews online to any static hosting service.
+[GitHub pages](https://pages.github.com/) is a free service available to
+all GitHub users that works with Bitcoin.org's site hierarchy.
+
+Before building a preview site, it is recommended that you set the
+environmental variable `BITCOINORG_BUILD_TYPE` to "preview".  This will
+enable some content that would otherwise be hidden and also create a
+robots.txt file that will help prevent the site from being indexed by
+search engines and mistaken for the actual Bitcoin.org website.
+
+In the bash shell, you can do this by running the following command line
+before building you preview:
+
+    export BITCOINORG_BUILD_TYPE=preview
+
+You can also add this line to your `~/.bashrc` file if you frequently
+build site previews so that you don't have to remember to run it for
+each shell.
+
 ## Developer Documentation
 
 Most parts of the documentation can be found in the [_includes](https://github.com/bitcoin-dot-org/bitcoin.org/tree/master/_includes)
diff --git a/_build/update_txpreview.sh b/_build/update_txpreview.sh
index 5cec9672..fbd8e6b0 100755
--- a/_build/update_txpreview.sh
+++ b/_build/update_txpreview.sh
@@ -11,6 +11,9 @@ WORKDIR=`mktemp -d`
 LIVEDIR=`mktemp -d`
 SITEDIR='/bitcoin.org/txpreview'
 DESTDIR='/var/www/txpreview'
+BITCOINORG_BUILD_TYPE='preview'
+
+export BITCOINORG_BUILD_TYPE
 
 # Stop script in case a single command fails
 set -e
diff --git a/robots.txt b/robots.txt
index 8ee21765..ceaa90d5 100644
--- a/robots.txt
+++ b/robots.txt
@@ -1 +1,12 @@
+---
+# This file is licensed under the MIT License (MIT) available on
+# http://opensource.org/licenses/MIT.
+
+layout: null
+---
+{% if site.env.BITCOINORG_BUILD_TYPE == 'preview' %}
+User-agent: *
+Disallow: /
+{% else %}
 Sitemap: https://bitcoin.org/sitemap.xml
+{% endif %}