minikube/docs/contributors/adding_a_dependency.md

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#### Adding a New Dependency
Minikube uses `Godep` to manage vendored dependencies.
`Godep` can be a bit finnicky with a project with this many dependencies.
Here is a rough set of steps that usually works to add a new dependency.
1. Make a clean GOPATH, with minikube in it.
This isn't strictly necessary, but it usually helps.
```shell
mkdir -p $HOME/newgopath/src/k8s.io
export GOPATH=$HOME/newgopath
cd $HOME/newgopath/src/k8s.io
git clone https://github.com/kubernetes/minikube.git
cd minikube
```
1. Install the package versions specified in Godeps/Godeps.json
```shell
godep restore ./...
```
NOTE: If you encounter a HTTP 301 error, you may need to set the following:
`git config --global http.https://gopkg.in.followRedirects true`
1. `go get` your new dependency.
```shell
go get mynewdepenency
```
1. Use it in code, build and test.
1. Import the dependency from GOPATH into vendor/
```shell
godep save ./...
```
NOTE: godep seems to have an issue with not recovering files in `vendor/golang.org/x/sys/windows/`
IF you plan on committing your updated dependencies, make sure not to remove these files in your commit
If it is a large dependency, please commit the vendor/ directory changes separately.
This makes review easier in Github.
NOTE: We have recently added a deprecation message regarding boot2docker. Make sure that this deprecation message ends up in the vendored code at `/vendor/github.com/docker/machine/libmachine/provision/boot2docker.go`: [https://github.com/kubernetes/minikube/blob/master/vendor/github.com/docker/machine/libmachine/provision/boot2docker.go#L220](https://github.com/kubernetes/minikube/blob/master/vendor/github.com/docker/machine/libmachine/provision/boot2docker.go#L220)
```shell
git add vendor/
git commit -m "Adding dependency foo"
git add --all
git commit -m "Adding cool feature"
```