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watchtower/CONTRIBUTING.md

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## Prerequisites
To contribute code changes to this project you will need the following development kits.
* [Go](https://golang.org/doc/install)
* [Docker](https://docs.docker.com/engine/installation/)
As watchtower utilizes go modules for vendor locking, you'll need at least Go 1.11.
You can check your current version of the go language as follows:
```bash
~ $ go version
go version go1.12.1 darwin/amd64
```
## Checking out the code
Do not place your code in the go source path.
```bash
git clone git@github.com:<yourfork>/watchtower.git
cd watchtower
```
## Building and testing
watchtower is a go application and is built with go commands. The following commands assume that you are at the root level of your repo.
```bash
go build # compiles and packages an executable binary, watchtower
go test ./... -v # runs tests with verbose output
./watchtower # runs the application (outside of a container)
```
If you dont have it enabled, you'll either have to prefix each command with `GO111MODULE=on` or run `export GO111MODULE=on` before running the commands. [You can read more about modules here.](https://github.com/golang/go/wiki/Modules)
To build a Watchtower image of your own, use the self-contained Dockerfiles. As the main Dockerfile, they can be found in `dockerfiles/`:
- `dockerfiles/Dockerfile.dev-self-contained` will build an image based on your current local Watchtower files.
- `dockerfiles/Dockerfile.self-contained` will build an image based on current Watchtower's repository on GitHub.
e.g.:
```bash
sudo docker build . -f dockerfiles/Dockerfile.dev-self-contained -t containrrr/watchtower # to build an image from local files
```