=== 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`):

[source,xml,subs="+attributes"]
----
<dependency>
  <groupId>io.vertx</groupId>
  <artifactId>vertx-config-git</artifactId>
  <version>3.5.1</version>
</dependency>
<dependency>
  <groupId>io.vertx</groupId>
  <artifactId>vertx-config</artifactId>
  <version>3.5.1</version>
</dependency>
----

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

[source,groovy,subs="+attributes"]
----
compile 'io.vertx:vertx-config:3.5.1'
compile 'io.vertx:vertx-config-git:3.5.1'
----

==== Configuring the store

Once added to your classpath or dependencies, you need to configure the
`link:../../apidocs/io/vertx/config/ConfigRetriever.html[ConfigRetriever]` to use this store:

[source, groovy]
----

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

def retriever = 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.