### Git Configuration Store

The Git Configuration Store is an extension to the Vert.x Configuration Retriever to retrieve configuration from a Git repository.

#### Using the Git Configuration Store

To use the Git Configuration, add the following dependency to the dependencies section of your build descriptor:

- Maven (in your `pom.xml`):

    <dependency>
      <groupId>io.vertx</groupId>
      <artifactId>vertx-config-git</artifactId>
      <version>3.4.2</version>
    </dependency>
    <dependency>
      <groupId>io.vertx</groupId>
      <artifactId>vertx-config</artifactId>
      <version>3.4.2</version>
    </dependency>

- Gradle (in your `build.gradle` file):

    compile 'io.vertx:vertx-config:3.4.2'
    compile 'io.vertx:vertx-config-git:3.4.2'

#### Configuring the store

Once added to your classpath or dependencies, you need to configure the `ConfigRetriever` to use this store:

    require 'vertx-config/config_retriever'

    git = {
      'type' => "git",
      'config' => {
        'url' => "https://github.com/cescoffier/vertx-config-test.git",
        'path' => "local",
        'filesets' => [
          {
            'pattern' => "*.json"
          }
        ]
      }
    }

    retriever = VertxConfig::ConfigRetriever.create(vertx, {
      'stores' => [
        git
      ]
    })

The configuration requires:

- the `url` of the repository

- the `path` where the repository is cloned (local directory)

- at least `fileset` indicating the set of files to read (same behavior as the directory configuration store).

You can also configure the `branch` (`master` by default) to use and the name of the `remote` repository (`origin` by default).

#### How does it works

If the local `path` does not exist, the configuration store clones the repository into this directory. Then it reads the file matching the different file sets.

It the local `path` exist, it tried to update it (it switches branch if needed)). If the update failed the configuration retrieval fails.

Periodically, the repositories is updated to check if the configuration has been updated.