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semantic-release-docker

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🐳 Set of semantic-release plugins to publish to DockerHub

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# semantic-release-docker

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[![license](https://img.shields.io/npm/l/semantic-release-docker.svg)](https://github.com/felixfbecker/semantic-release-docker/blob/master/LICENSE)

Set of [semantic-release](https://github.com/semantic-release/semantic-release) plugins for publishing a docker image to
[Docker Hub](https://hub.docker.com/).

```json
{
  "release": {
    "verifyConditions": {
      "path": "semantic-release-docker",
      "registryUrl": "docker.io"
    },
    "publish": {
      "path": "semantic-release-docker",
      "name": "username/imagename"
    }
  }
}
```

## Configuration

Your credentials have to be configured with the environment variables `DOCKER_USERNAME` and `DOCKER_PASSWORD`.

In addition, you need to specify the name of the image as the `name` setting in the publish step. If you need to specify a custom docker registry URL, add it as the `registryUrl` setting in the verifyConditions step.

## Plugins

### `verifyConditions`

Verify that all needed configuration is present and login to the Docker registry.

### `publish`

Tag the image specified by `name` with the new version, push it to Docker Hub and update the `latest` tag.

## Example .travis.yml

```yml
jobs:
  include:
    - stage: release
      language: node_js
      node_js: '8'
      services:
        - docker
      script:
        - docker build -t username/imagename .
        - npm run semantic-release

stages:
  - test
  - name: release
    if: branch = master AND type = push AND fork = false

branches:
  except:
    - /^v\d+\.\d+\.\d+$/
```

## Circle CI Example .config.yml

```yml
version: 2
jobs:
  release:
    docker:
      - image: circleci/node:8
    steps:
      - setup_remote_docker:
          docker_layer_caching: true
      - run:
          name: release
          command: |
            docker build -t username/imagename .
            npm run semantic-release

workflows:
  version: 2
  pipeline:
    jobs:
      - test
      - release:
          requires:
            - test
          filters:
            branches:
              only: master
```

> Note that `setup_remote_docker` step is required for this plugin to work in Circle CI environment

## How to keep new version in package.json inside docker image?
In order to do that you need to run `docker build` command during semantic-release `prepareCmd` event.

It can be done with help of [@semantic-release/exec](https://github.com/semantic-release/exec) for example.

```json
{
  "plugins": [
    ["@semantic-release/exec", {
      "prepareCmd": "docker build -t username/imagename ."
    }],
    ["semantic-release-docker", {
      "name": "username/imagename"
    }]
  ]
}
```

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