Source Directories

The AOSP source code is spread across a large number of git repositories. The directories included in the robotnix build may be specified using the source.dirs.* options.

For example, the following configuration will include a new repository checked out under foo/bar by setting the source.dir.<name>.src option.

{
  source.dirs."foo/bar".src = pkgs.fetchGit {
    url = "https://example.com/repo/foobar.git";
    rev = "f506faf86b8f01f9c09aae877e00ad0a2b4bc511";
    sha256 = "0000000000000000000000000000000000000000000000000000000000000000";
  };
}

While the above uses pkgs.fetchGit, the src option could refer to any Nix derivation producing a directory.

Additionaly, robotnix provides a convenient mechanism for patching existing source directories:

{
  # source.dirs.<name>.patches can refer to a list of patches to apply
  source.dirs."frameworks/base".patches = [ ./example.patch ];

  # source.dirs.<name>.postPatch can refer to a snippet of shell script to modify the source tree
  source.dirs."frameworks/base".postPatch = ''
    sed -i 's/hello/there/' example.txt
  '';
}

Each flavor in robotnix conditionally sets the default source.dirs to include the Android source directories required for the build.

Robotnix supports two alternative approaches for fetching source files:

• Build-time source fetching with pkgs.fetchgit. This is the default. An end user wanting to fetch sources not already included in robotnix would need to create a repo json file using scripts/mk_repo_file.py and set source.dirs = lib.importJSON ./example.json;
• Evaluation-time source fetching with builtins.fetchGit. This is more convenient for development when changing branches, as it allows use of a shared user git cache. The end user will need to set source.manifest.{url,rev,sha256} and enable source.evalTimeFetching. However, with builtins.fetchGit, the drvs themselves depend on the source, and nix-copy-closure of even just the .drv files would require downloading the source as well. This option is not as well tested as the build-time source fetching option.