From 78d6ca135994ebe31bd8c4d3effb3e0896c2deed Mon Sep 17 00:00:00 2001
From: William Blankenship <william.jblankenship@gmail.com>
Date: Mon, 16 Mar 2015 19:08:12 -0500
Subject: [PATCH] Detect if base image uses buildpack-deps

---
 .template-helpers/variant.sh | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/.template-helpers/variant.sh b/.template-helpers/variant.sh
index 86c5a600..a60914e0 100755
--- a/.template-helpers/variant.sh
+++ b/.template-helpers/variant.sh
@@ -9,9 +9,10 @@ if [ -z "$repo" ]; then
 fi
 
 dir="$(dirname "$(readlink -f "$BASH_SOURCE")")"
+url='https://raw.githubusercontent.com/docker-library/official-images/master/library/'"$repo" 
 
 IFS=$'\n'
-tags=( $(curl -sSL 'https://raw.githubusercontent.com/docker-library/official-images/master/library/'"$repo" | grep -vE '^$|^#' | cut -d':' -f1 | sort -u) )
+tags=( $(curl -sSL $url | grep -vE '^$|^#' | cut -d':' -f1 | sort -u) )
 unset IFS
 
 text=
@@ -23,9 +24,14 @@ for tag in "${tags[@]}"; do
 	fi
 done
 if [ "$text" ]; then
-	# give a little space
-	echo
-	echo
-	cat "$dir/variant.md"
-	echo "$text"
+  latest=($(curl -sSL $url | sed -e 's/git:\/\/github.com\///' -e 's/@/ /' - | grep "latest"))
+  dockerfile='https://raw.githubusercontent.com/'"${latest[1]}"'/'"${latest[2]}"'/'"${latest[3]}"'/Dockerfile'
+  base_image=$(curl -sSL $dockerfile | sed 's/:/\t/' | nawk '/^FROM .*$/ { print $2 }')
+  if [ "$base_image" = "buildpack-deps" ]; then
+    # give a little space
+    echo
+    echo
+    cat "$dir/variant.md"
+    echo "$text"
+  fi
 fi