Iñaki Villar cdsap

The Problem

While doing some remote build cache fidelity testing in #66841, I found that our lint analysis tasks were consistently getting cache misses due to an esoteric intermediate proguard file contents change.

After a little digging, I found these files were generated by AGP as a "merged" file of all that project's generated proguard files. This was most notable in projects using Moshi, which generates proguard rules on the fly.

My hunch was that these files were being merged with non-deterministic order, as I couldn't find anything that ensured ordering and this input was purely a file contents check (so the same rules in different order would still constitute a miss).

I was able to verify this was the case via snagging merged proguard.txt files via github actions artifact uploads.

I filed this issue for it here: issuetracker.google.com/issues/266403349 (note it's been made private for some reason).

Category theory jargon cheat sheet

A primer/refresher on the category theory concepts that most commonly crop up in conversations about Scala or FP. (Because it's embarassing when I forget this stuff!)

I'll be assuming Scalaz imports in code samples, and some of the code may be pseudo-Scala.

Functor

A functor is something that supports map.

	#!/bin/bash

	# init parameters
	readonly geUrl=$1
	readonly bearerToken=$2
	readonly daysAgo=$3

	# init global vars
	readonly maxBuildsPerBatch=100
	readonly recoveryFile="$0.out.build-scan-id"

	tasks.withType<JavaCompile>().configureEach {
	doLast {
	this.inputs.files.map { it ->
	if(it.isFile) {
	FileSize(it.length(), it.path)
	} else {
	FileSize(0, "DIR - " + it.path)
	}
	}.sortedBy {
	it.size

	def fingerprinter = services.get(org.gradle.internal.fingerprint.classpath.ClasspathFingerprinter)
	tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).configureEach { task ->
	doFirst {
	ClassLoader classLoader = task.getClass().classLoader
	while (classLoader instanceof URLClassLoader) {
	def fingerprints = [] as Set
	def allFiles = [] as Set
	classLoader.getURLs().each {
	fingerprints.add(["${task.path}:${file(it.file).name}", "${fingerprinter.fingerprint(files(it.file)).hash}"])
	allFiles.add(file(it.file))

	/**
	* 1) Change agpVersion
	* 2) Run './gradlew dumpSources'
	* 3) Check changeset into source control
	*/
	def agpVersion = 'UPDATE_THIS'

	repositories {
	google()
	jcenter()

	inline fun <A> A.logWith(logger: Logger, block: Logger.(A) -> Unit) : A =
	this.also { logger.block(it) }

	// With interface injection
	interface HasLog {
	val log: Logger
	fun <A> A.log(block: Logger.(A) -> Unit) : A =
	logWith(logger, block)
	}

	/**
	* Created by jjst on 21/03/16.
	*/
	object Floors {

	def main(args: Array[String]): Unit = {
	Console.println(floorNumber1("())"))
	Console.println(floorNumber2("())"))
	Console.println(floorNumber2(""))
	}

	import java.io.BufferedReader;
	import java.io.File;
	import java.io.FileReader;
	import java.net.URL;

	public class ResourceHelper {

	public String convertFileToString(File file) throws Exception {
	BufferedReader reader = new BufferedReader(new FileReader(file));
	StringBuilder sb = new StringBuilder();

	import android.support.annotation.CheckResult;
	import android.support.annotation.NonNull;
	import android.widget.AbsListView;

	import com.jakewharton.rxbinding.view.ViewEvent;

	public final class ListViewScrollEvent extends ViewEvent<AbsListView> {

	@CheckResult
	@NonNull