Prepare v0.4.2 release

CHANGELOG.md

@@ -3,7 +3,39 @@
 All notable changes to this project will be documented in this file. This
 project adheres to [Semantic Versioning](http://semver.org/).
 
-## Unreleased
+## 0.4.2
+
+### Rego
+
+This release changes the Rego syntax. The two main changes are:
+
+- Expressions are now separated by semicolons (instead of commas). When writing rules, the semicolons are optional.
+- Rules are no longer written in the form: `head :- body`. Instead they are written as `head { body }`.
+
+Also:
+
+- Set, array, and object literals now support trailing commas.
+- To declare a set literal with one element, you must include a trailing comma, e.g., `{ foo, }`.
+- Arithmetic and set operations can now be performed with infix notation, e.g., `x = 2 + 1`.
+- Sets can be referred to like objects and arrays now ([#243](https://github.com/open-policy-agent/opa/issues/243)). E.g., `p[_].foo = 1 # check if element in has attr foo equal to 1`.
+
+### Evaluation
+
+This release changes the evaluation behaviour for packages. Previously, if a package contained no rules OR all of the rules were undefined when evaluated, a query against the package path would return undefined. As of v0.4.2 the query will return an empty object.
+
+### REST API
+
+This release changes the Data API to return an HTTP 200 response if the document is undefined. The message body will contain an object without the `result` property.
+
+### Fixes
+
+- Allow sets to be treated like objects/arrays
+
+### Miscellaneous
+
+- Added high level API for Go users. See `github.com/open-policy-agent/opa/rego` package.
+- Improved expression String() function to handle infix operators better.
+- Added support for set intersection and union built-ins. See language docs.
 
 ## 0.4.1
 

Makefile

@@ -2,7 +2,7 @@
 # Use of this source code is governed by an Apache2
 # license that can be found in the LICENSE file.
 
-VERSION := 0.4.2-dev
+VERSION := 0.4.2
 
 PACKAGES := \
 	github.com/open-policy-agent/opa/ast/.../ \

site/examples/docker-authorization/index.md

@@ -66,7 +66,7 @@ $ mkdir -p policies
 ### 2. Download the latest version of OPA.
 
 ```shell
-$ curl -L https://github.com/open-policy-agent/opa/releases/download/v0.4.1/opa_linux_amd64 > opa
+$ curl -L https://github.com/open-policy-agent/opa/releases/download/v0.4.2/opa_linux_amd64 > opa
 $ chmod u+x opa
 ```
 

site/get-opa/index.md

@@ -13,9 +13,9 @@ title: Get Open Policy Agent
 The binary releases for 64-bit Linux and Mac are available for download here. For other releases of OPA see the [GitHub Releases](https://github.com/open-policy-agent/opa/releases) page.
 {: .opa-header--text}
 
-  * [64-bit Linux](https://github.com/open-policy-agent/opa/releases/download/v0.4.1/opa_linux_amd64){: .opa-header--download-list--link}
-  * [64-bit Mac OS X](https://github.com/open-policy-agent/opa/releases/download/v0.4.1/opa_darwin_amd64){: .opa-header--download-list--link}
-  * [Go Source](https://github.com/open-policy-agent/opa/archive/v0.4.1.tar.gz){: .opa-header--download-list--link}
+  * [64-bit Linux](https://github.com/open-policy-agent/opa/releases/download/v0.4.2/opa_linux_amd64){: .opa-header--download-list--link}
+  * [64-bit Mac OS X](https://github.com/open-policy-agent/opa/releases/download/v0.4.2/opa_darwin_amd64){: .opa-header--download-list--link}
+  * [Go Source](https://github.com/open-policy-agent/opa/archive/v0.4.2.tar.gz){: .opa-header--download-list--link}
   {: .opa-header--download-list}
 
 {% endcontentfor %}
@@ -25,22 +25,22 @@ The binary releases for 64-bit Linux and Mac are available for download here. Fo
 ## 64-bit Linux
 
 ```shell
-$ curl -L https://github.com/open-policy-agent/opa/releases/download/v0.4.1/opa_linux_amd64 > opa
+$ curl -L https://github.com/open-policy-agent/opa/releases/download/v0.4.2/opa_linux_amd64 > opa
 $ chmod u+x opa
 $ ./opa version
 ```
 
 ## 64-bit Mac OS X
 
 ```shell
-$ curl -L https://github.com/open-policy-agent/opa/releases/download/v0.4.1/opa_darwin_amd64 > opa
+$ curl -L https://github.com/open-policy-agent/opa/releases/download/v0.4.2/opa_darwin_amd64 > opa
 $ chmod u+x opa
 $ ./opa version
 ```
 
 ## Docker Image (64-bit Linux)
 ```shell
-$ docker run openpolicyagent/opa:0.4.1 version
+$ docker run openpolicyagent/opa:0.4.2 version
 ```
 
 {% endcontentfor %}