Build variant specific generated source dir for proto files

[Zeliret]

Hey everyone 👋

I'm working on a custom task setup, where I download proto files from a remote source. For each flavored build variant I download a set of files or a zip (depends on the task) which can have a Jni or assets, and also a proto file, and I use AGP API to put them into a generated source set: build/generated/*. I know that Wire can automatically detect src/main/proto but how can I tell it to look in generated folder for a specific build variant? I tried to connect my task output (the generated directory property) to the input of the WireTask but so far it doesn't work. Is there any way to do that? I don't want to copy proto files to the src dir, I want to keep them in the build directory.

[oldergod]

Check our Android variant sample and let us know if that helps. Although I don't think Android variants are meant to be looking at generated folders.

[Zeliret]

@oldergod thank you for the answer. Unfortunately this example is about the source folder, while generated things are in the build folder.
My use case is that proto files together with the so library are coming from a server during the build, so I want it to be hidden in the build directory. And in case they change for any specific build variant I don't want to relay on one predefined folder.
Maybe there is a way to tell the WireTask which folder should be used for proto sources? I tried setSource (because it inherits SourceTask) and inputs.dir(), but so far no progress.

[oldergod]

You should be able to set any directory as source with srcDir. https://square.github.io/wire/wire_compiler/#inputs-and-outputs

[Zeliret]

@oldergod This works only when files are present already:

wire {
    sourcePath {
        androidComponents {
            onVariants { variant ->
                val dir = layout.buildDirectory.file("generated/${variant.name}/proto").get().asFile
                if (dir.exists()) {
                    srcDir(dir.absolutePath)
                }
            }
        }
        include("my_file.proto")
    }
    kotlin {}
}

But whenever I clean the project it doesn't sync any more because of Wire. Basically the files are not there yet and Wire cannot check the directory or something, which is understandable, as the files are generated later.

[oldergod]

You probably could set up gradle tasks so that Wire's generateProtos depends on your task

[Zeliret]

Yes I already did this, but oddly enough, when I use build/generated/<variant>/proto/* folders it doesn't work, but when I copy proto files to a "shared" location build/generated/proto/* during the task execution, then Wire can find those files.

So far cannot understand what is the difference. =\