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VirtualBox wrappers in Go

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# go-virtualbox

This is a wrapper package for Golang to interact with VirtualBox. The API is
experimental at the moment and you should expect frequent changes. There is
no compatibility guarantee between newer and older versions of Virtualbox.

**Table of Contents**

1. [Status](#status)
2. [Usage](#usage)
    1. [Library](#library)
    2. [Commands](#commands)
    3. [Documentation](#documentation)
3. [Building](#building)
4. [Testing](#testing)
    1. [Preparation](#preparation)
    2. [Run tests](#run-tests)
    3. [Re-generate mock](#re-generate-mock)
5. [Caveats](#caveats)

## Status

| Project | Status | Notes |
|---------|--------|-------|
| [Github Actions](https://github.com/features/actions) | [![Continuous Integration](https://github.com/terra-farm/go-virtualbox/workflows/Continuous%20Integration/badge.svg)](https://github.com/terra-farm/go-virtualbox/actions) | |
| [Go Report Card](https://goreportcard.com/) | [![Go Report Card](https://goreportcard.com/badge/github.com/terra-farm/go-virtualbox?style=flat-square)](https://goreportcard.com/report/github.com/terra-farm/go-virtualbox) | scan  code with `gofmt`, `go vet`, `gocyclo`, `golint`, `ineffassign`, `license` and `misspell`. |
| [GoDoc](http://godoc.org) | [![Go Doc](https://img.shields.io/badge/godoc-reference-blue.svg?style=flat-square)](http://godoc.org/github.com/terra-farm/go-virtualbox) | |
| Release | [![Release](https://img.shields.io/github/release/terra-farm/go-virtualbox.svg?style=flat-square)](https://github.com/terra-farm/go-virtualbox/releases/latest) | |

## Usage

### Library

The part of the library that manages guest properties can run both from the Host and the Guest.

```go
    err := virtualbox.SetGuestProperty("MyVM", "test_key", "test_val")
    val, err := GetGuestProperty(VM, "test_key")
```

See [GoDoc](https://godoc.org/github.com/terra-farm/go-virtualbox) for full details.

### Commands

The [vbhostd](./cmd/vbhostd/README.md) commands waits on the `vbhostd/*` guest-properties pattern.

- When the guest writes a value on the `vbhostd/open`, it causes the host to open the given location:
    - Write `http://www.hp.com` will open the default browser as the given URL
    - Write `mailto:foo@bar.com?Cc=bar@foo.com` opens the default mailer pre-filling the recipient and carbon-copy recipient fields

### Documentation

For the released version, see [GoDoc:terra-farm/go-virtualbox](https://godoc.org/github.com/terra-farm/go-virtualbox). To see the local documentation, run `godoc -http=:6060 &` and then `open http://localhost:6060/pkg/github.com/terra-farm/go-virtualbox/`.

## Building

First install dependencies

- [GoLang](https://golang.org/doc/install#install)
- [GNU Make](https://www.gnu.org/software/make/) (Windows: via `choco install -y gnuwin32-make.portable)

Get Go dependencies: `make deps` or:

```bash
$ go get -v github.com/golang/dep/cmd/dep
$ dep ensure -v
```

Then build: `make build` or:

```bash
$ go build -v ./...
```

* `default` run everything in order
* `deps` install dependencies (`dep` and others)
* `build` run `go build ./...`
* `test` run `go test ./...`
* `lint` only run `gometalinter` linter

## Testing

### Preparation

Tests run using mocked interfaces, unless the `TEST_VM` environment variable is set, in order to test against real VirtualBox. You either need to  have a pre-provisioned VirtualBox VM and  to set its name using the `TEST_VM` environment variable, or use [Vagrant](https://www.vagrantup.com/intro/getting-started/).

```bash
$ vagrant box add bento/ubuntu-16.04
# select virtualbox as provider

$ vagrant up
```

Then run the tests

```bash
$ export TEST_VM=go-virtualbox
$ go test
```

...or (on Windows):

```shell
> set TEST_VM=go-virtualbox
> go test
```

Once you are done with testing, run `vagrant halt` to same resources.

### Run tests

As usual, run `go test`, or `go test -v`.  To run one test in particular,
run `go test --run TestGuestProperty`.

### Re-generate mock

```bash
go generate ./...
```

## Using local changes with your own project

If you have a project which depends on this library, you probably want to test your local changes of `go-virtualbox` in your project.
See [this article](https://medium.com/@teivah/how-to-test-a-local-branch-with-go-mod-54df087fc9cc) on how to set up your environment
to do this.

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