aws-keychain 3.0 (new formula)

The aim of aws-keychain is to run commands that require AWS credentials
without ever storing those credentials unencrypted on disk. Mac OS X's
keychain is used for storage, and credentials are passed to commands via
the well known environment variables that all tools look for.

Formula/aws-keychain.rb

@@ -0,0 +1,17 @@
+class AwsKeychain < Formula
+  desc "Uses OS X keychain for storage of AWS credentials."
+  homepage "https://github.com/pda/aws-keychain"
+  url "https://github.com/pda/aws-keychain/archive/v3.0.0.tar.gz"
+  sha256 "3c9882d3b516b629303ca9a045fc50f6eb75fda25cd2452f10c47eda205e051f"
+
+  def install
+    bin.install "aws-keychain"
+  end
+
+  test do
+    # aws-keychain is a simple shell script wrapper around built-in
+    # keychain utilities. It is not possible to create a new
+    # keychain without triggering a keychain prompt.
+    system "aws-keychain --help || true"
+  end
+end