Add a Go Module

The repository contains a few submodules. To add a new one and ensure it is tested, follow the following steps:

1. Create a directory for the module:

   cd ~/my_path_to/datadog-agent && mkdir mymodule
   

2. Initialize a new Go module:

   cd path/to/mymodule && go mod init
   

3. Create a dummy root package file doc.go:

   cat >doc.go <<EOL
   // Unless explicitly stated otherwise all files in this repository are licensed
   // under the Apache License Version 2.0.
   // This product includes software developed at Datadog (https://www.datadoghq.com/).
   // Copyright 2016-present Datadog, Inc.
   package mymodule
   EOL
   

4. Add mymodule to the DEFAULT_MODULES in tasks/modules.py:

   DEFAULT_MODULES = (
   ...,
   "path/to/mymodule": GoModule("path/to/mymodule", independent=True, should_tag=False, targets=["."]),
   )
   

   • independent: Should it be importable as an independent module?
   • should_tag: Should the Agent pipeline tag it?
   • targets: Should go test target specific subfolders?

5. If you use your module in another module within datadog-agent, add the require and replace directives in go.mod.

   From the other module root, install the dependency with go get:

   go get github.com/DataDog/datadog-agent/path/to/mymodule
   

   Then add the replace directive in the go.mod file:

   module github.com/DataDog/datadog-agent/myothermodule
   go 1.18
   // Replace with local version
   replace github.com/DataDog/datadog-agent/path/to/mymodule => ../path/to/mymodule
   require (
       github.com/DataDog/datadog-agent/path/to/mymodule v0.0.0-20230526143644-ed785d3a20d5
   )
   

   Example PR: #17350