### 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-scala_2.12</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-scala_2.12:3.4.2'

#### Configuring the store

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

    var git = ConfigStoreOptions()
      .setType("git")
      .setConfig(new io.vertx.core.json.JsonObject().put("url", "https://github.com/cescoffier/vertx-config-test.git").put("path", "local").put("filesets", new io.vertx.core.json.JsonArray().add(new io.vertx.core.json.JsonObject().put("pattern", "*.json"))))

    var retriever = ConfigRetriever.create(vertx, ConfigRetrieverOptions()
      .setStores(Set(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.