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

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

[source,groovy,subs="+attributes"]
----
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
`link:../../apidocs/io/vertx/config/ConfigRetriever.html[ConfigRetriever]` to use this store:

[source, kotlin]
----

var git = ConfigStoreOptions(
  type = "git",
  config = json {
    obj(
      "url" to "https://github.com/cescoffier/vertx-config-test.git",
      "path" to "local",
      "filesets" to array(obj("pattern" to "*.json"))
    )
  })

var retriever = ConfigRetriever.create(vertx, ConfigRetrieverOptions(
  stores = listOf(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.