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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
// Substitute a local GeckoView AAR into a consuming Gradle project.
// To use this, in a consuming Gradle project's `/build.gradle` add a stanza like:
// ext.topsrcdir = '/absolute/path/to/mozilla-central'; apply from: "${ext.topsrcdir}/substitute-local-geckoview.gradle"
// The object directory will be determined using `mach environment` and will agree with `./mach
// gradle` and Android Studio. Or, specify the exact object directory with a stanza like:
// ext.topsrcdir = '/absolute/path/to/mozilla-central'
// ext.topobjdir = '/absolute/path/to/objdir'
// apply from: "${ext.topsrcdir}/substitute-local-geckoview.gradle"
// Substitution works with artifact and non-artifact builds.
// If you get errors about .jar files not being found, ensure that the consuming
// application is using a recent Android-Gradle plugin (say, 3.4+). There were
// issues with Jetifier, and issues with .jar vs. .aar extensions, in older
// versions.
import groovy.json.JsonSlurper
def log(message) {
logger.lifecycle("[substitute-local-geckoview] ${message}")
def warn(message) {
logger.warn("[substitute-local-geckoview] Warning: ${message}")
if (!project.ext.has('topsrcdir')) {
throw new GradleException("ext.topsrcdir must be specified to substitute for a local GeckoView")
* Loads the mozconfig and returns any variables derived from it, avoiding side effects.
* This method is relatively slow because it calls mach, which starts a python interpreter, will
* becomes very slow if called for numerous subprojects. Therefore, it should only be called once
* per build.
def loadMozconfig() {
apply from: "${topsrcdir}/mobile/android/gradle/mach_env.gradle"
// topobjdir, `mach environment` correctly finds the mozconfig corresponding to that object
// directory.
def commandLine = ["${topsrcdir}/mach", "environment", "--format", "json", "--verbose"]
def proc = commandLine.execute(
new File(ext.has('topobjdir') ? ext.get('topobjdir') : topsrcdir))
def standardOutput = new ByteArrayOutputStream()
def standardError = new ByteArrayOutputStream()
proc.consumeProcessOutput(standardOutput, standardError)
// Only show the output if something went wrong.
if (proc.exitValue() != 0) {
throw new GradleException("Process '${commandLine}' finished with non-zero exit value ${proc.exitValue()}:\n\n"
+ "stdout:\n${standardOutput.toString()}\n\n"
+ "stderr:\n${standardError.toString()}")
def slurper = new JsonSlurper()
def mozconfig = slurper.parseText(standardOutput.toString())
if (topsrcdir != mozconfig.topsrcdir) {
throw new GradleException("Specified topsrcdir ('${topsrcdir}') is not mozconfig topsrcdir ('${mozconfig.topsrcdir}')")
def topobjdir
if (ext.has('topobjdir')) {
topobjdir = ext.topobjdir
} else {
topobjdir = mozconfig.topobjdir
log("Found topobjdir ${topobjdir} from topsrcdir ${topsrcdir}")
if (mozconfig.substs.MOZ_BUILD_APP != 'mobile/android') {
throw new GradleException("Building with Gradle is only supported for GeckoView, i.e., MOZ_BUILD_APP == 'mobile/android'.")
log("Will substitute GeckoView (geckoview-{nightly,beta}) with local GeckoView (geckoview-default) from ${topobjdir}/gradle/build/mobile/android/geckoview/maven")
if (!mozconfig.substs.COMPILE_ENVIRONMENT) {
log("To update the local GeckoView, run `./mach gradle geckoview:publishWithGeckoBinariesDebugPublicationToMavenRepository` in ${topsrcdir}")
} else {
log("To update the local GeckoView, run `./mach build binaries && ./mach gradle geckoview:publishWithGeckoBinariesDebugPublicationToMavenRepository` in ${topsrcdir}")
return [mozconfig, topobjdir]
// This script is expected to be called for every subproject in the build (in ac, this is over 100)
// but loadMozconfig should only be called once per build (see the javadoc) so we store the output
// of that call as a global variable and re-use it when this script is called again.
def LOAD_MOZCONFIG_CACHE = "substitute-local-geckoview-mozconfig-cache"
if (!rootProject.ext.has(LOAD_MOZCONFIG_CACHE)) {
rootProject.ext.set(LOAD_MOZCONFIG_CACHE, loadMozconfig())
def (mozconfig, topobjdir) = rootProject.ext.get(LOAD_MOZCONFIG_CACHE)
repositories {
maven {
name "Local GeckoView Maven repository"
url "${topobjdir}/gradle/maven"
configurations.all { config ->
// Like `geckoview-nightly` for a multi-architecture fat AAR or
// `geckoview-nightly-armeabi-v7a` for an architecture-specific AAR.
def geckoviewModules = [
def geckoviewOmniModules = [
if (config.isCanBeResolved()) {
config.resolutionStrategy { strategy ->
dependencySubstitution {
all { dependency ->
// We could restrict based on target architecture, but there doesn't seem to
// be much advantage to doing so right now.
if (!(dependency.requested instanceof ModuleComponentSelector)) {
// We can only substitute for a module: we're never going to substitute
// for a project.
def group =
def module = dependency.requested.module
if (group == 'org.mozilla.geckoview'
&& (geckoviewModules.contains(module) || geckoviewOmniModules.contains(module))) {
def name = ''
def isLite = mozconfig.substs.MOZ_ANDROID_GECKOVIEW_LITE
if (isLite) {
name = 'geckoview-default'
} else {
name = 'geckoview-default-omni'
if (geckoviewModules.contains(module) && !isLite) {
warn("Substituting a geckoview omni build into a lite dependency. Add ac_add_options --enable-geckoview-lite to ${mozconfig.mozconfig.path} to fix this.")
} else if (geckoviewOmniModules.contains(module) && isLite) {
// Substituting lite into omni is unlikely to work at
// all so we just error out here.
throw new GradleException("Substituting a geckoview lite build into an omni dependency. Remove ac_add_options --enable-geckoview-lite in ${mozconfig.mozconfig.path} to fix this.")
log("Substituting ${group}:${dependency.requested.module} with local GeckoView ${group}:${name} in ${config}")
dependency.useTarget([group: group, name: name, version: '+'])
// We substitute with a dynamic version ('+'). It seems that Gradle
// discovers the underlying AAR is out of date correctly based on file
// timestamp already, but let's try to avoid some class of cache
// invalidation error while we're here.
strategy.cacheDynamicVersionsFor 0, 'seconds'
strategy.cacheChangingModulesFor 0, 'seconds'