omg-transform

An enaml based tool that allows you to perform transformations on bosh manifests.

Development Setup

Make sure you have a working Go toolchain and have installed glide.

go get -d -u github.com/enaml-ops/omg-transform
cd $GOPATH/src/enaml-ops/omg-transform
glide install
go build
go test `glide nv`

Usage

By default, omg-transform attempts to read a manifest from standard in and writes the transformed manifest to standard out.

For example, to run a transformation on a manifest produced by omg-cli:

omg-cli deploy-product --print-manifest cloudfoundry-plugin-linux | omg-transform <TRANSFORM> [flags...]

Transformations

• change-network: change an instance group's network
• clone: clone an instance group
• change-az: change an instance group's AZs
• add-vm-extension: add a vm extension to an existing instance group
• add-tags: add key-value pairs for VM tagging

Adding a new transformation

Implementing a transformation is straightforward.

1. Create a new *.go file for your transformation.

2. Add a type that implements Transformation

3. Implement a function that builds your new type from a set of arguments. This function should have the signature func(args []string) (Transformation, error).

   The args slice provided to your function will be everything after the transformation on the command line: omg-transform <transformation> **[args]**.

   Go's built-in flag.FlagSet is a great way to parse these arguments. Take a look at the clone transformation for an example.

4. Register your builder function in package main's init() function. The name that you provide to RegisterTransformationBuilder() is the command that users will use to invoke your transformation.

Don't forget to add tests!