Modify build system

Bug 40083: Make locale ordering in BuildConfig deterministic

Bug 40042: Add option do overwrite timestamp in extension version

Bug 40059: Use MOZ_BUILD_DATE for versionCode

At the same time we adapt MOZ_BUILD_DATE to our needs where it is
actually used and not in tor-browser-build. This gives us more
flexibility. See: tor-browser-build#40084.

Bug 40067: Fix reproducibility issue in classes2.dex

We make sure our MOZ_BUILD_DATE gets used as a source for showing date
related information on the Fenix about page.

Bug 40071: Show only supported locales

Bug 40064: Use Gecko Beta for Nightly and Debug variants

Bug 40123: Allow building the instrumented tests apks for variants other than debug

This allows to specify the variant of the instrumented tests via
a `testBuildType` gradle argument. It also applies a workaround for
a R8 issue from https://issuetracker.google.com/issues/140851070.

Bug 40143: Use deterministic date in Test apk

The build config was using Date() when generating the Test apk's
versionName.

app/build.gradle

@@ -17,7 +17,16 @@ import org.gradle.internal.logging.text.StyledTextOutputFactory
 
 import static org.gradle.api.tasks.testing.TestResult.ResultType
 
+def obtainTestBuildType() {
+    def result = "debug";
+    if (project.hasProperty("testBuildType")) {
+        result = project.getProperties().get("testBuildType")
+    }
+    result
+}
+
 android {
+    testBuildType obtainTestBuildType()
     compileSdkVersion Config.compileSdkVersion
 
     if (project.hasProperty("testBuildType")) {
@@ -643,16 +652,22 @@ task buildTranslationArray {
     // This isn't running as a task, instead the array is build when the gradle file is parsed.
     // https://github.com/mozilla-mobile/fenix/issues/14175
     def foundLocales = new StringBuilder()
+    def languageCodes = []
     foundLocales.append("new String[]{")
 
     fileTree("src/main/res").visit { FileVisitDetails details ->
-        if(details.file.path.endsWith("${File.separator}strings.xml")){
+        if(details.file.path.endsWith("${File.separator}torbrowser_strings.xml")){
             def languageCode = details.file.parent.tokenize(File.separator).last().replaceAll('values-','').replaceAll('-r','-')
             languageCode = (languageCode == "values") ? "en-US" : languageCode
-            foundLocales.append("\"").append(languageCode).append("\"").append(",")
+            languageCodes.add(languageCode)
         }
     }
-
+    // The order of files in a `FileTree` is not stable, even on a single
+    // computer. Thus we need to sort the `languageCode`s. See: fenix#40083.
+    languageCodes.sort()
+    languageCodes.each {
+        foundLocales.append("\"").append(it).append("\"").append(",")
+    }
     foundLocales.append("}")
     def foundLocalesString = foundLocales.toString().replaceAll(',}','}')
     android.defaultConfig.buildConfigField "String[]", "SUPPORTED_LOCALE_ARRAY", foundLocalesString
@@ -735,7 +750,13 @@ ext.updateExtensionVersion = { task, extDir ->
         rename { 'manifest.json' }
         into extDir
 
-        def values = ['version': AndroidComponents.VERSION + "." + new Date().format('MMddHHmmss')]
+        def systemEnvBuildDate = System.getenv('MOZ_BUILD_DATE')
+        // MOZ_BUILD_DATE is in the yyyyMMddHHmmss format. Thus, we only use a
+        // substring of it if it is available.
+        def values = ['version': AndroidComponents.VERSION + "." +
+                      (systemEnvBuildDate != null ?
+                       systemEnvBuildDate.substring(4) :
+                       new Date().format('MMddHHmmss'))]
         inputs.properties(values)
         expand(values)
     }

app/proguard-rules.pro

@@ -121,3 +121,6 @@
 # Keep Android Lifecycle methods
 # https://bugzilla.mozilla.org/show_bug.cgi?id=1596302
 -keep class androidx.lifecycle.** { *; }
+
+# Workaround for 'already has mapping' r8 issue (https://issuetracker.google.com/issues/140851070)
+-keep class com.google.android.gms.common.internal.BaseGmsClient { *; }

buildSrc/src/main/java/Config.kt

@@ -19,7 +19,12 @@ object Config {
 
     @JvmStatic
     private fun generateDebugVersionName(): String {
-        val today = Date()
+        val today = if (System.getenv("MOZ_BUILD_DATE") != null) {
+            val format = SimpleDateFormat("yyyyMMddHHmmss", Locale.US)
+            format.parse(System.getenv("MOZ_BUILD_DATE"))
+        } else {
+            Date()
+        }
         // Append the year (2 digits) and week in year (2 digits). This will make it easier to distinguish versions and
         // identify ancient versions when debugging issues. However this will still keep the same version number during
         // the week so that we do not end up with a lot of versions in tools like Sentry. As an extra this matches the
@@ -46,7 +51,14 @@ object Config {
 
     @JvmStatic
     fun generateBuildDate(): String {
-        val dateTime = LocalDateTime.now()
+        val dateTime = if (System.getenv("MOZ_BUILD_DATE") != null) {
+          // Converting our MOZ_BUILD_DATE to LocalDateTime
+          val format = SimpleDateFormat("yyyyMMddHHmmss", Locale.US)
+          val date = format.parse(System.getenv("MOZ_BUILD_DATE"))
+          java.sql.Timestamp(date.getTime()).toLocalDateTime()
+        } else {
+          LocalDateTime.now()
+        }
         val timeFormatter = DateTimeFormatter.ofPattern("h:mm a")
 
         return "${dateTime.dayOfWeek.toString().toLowerCase().capitalize()} ${dateTime.monthValue}/${dateTime.dayOfMonth} @ ${timeFormatter.format(dateTime)}"
@@ -55,7 +67,7 @@ object Config {
     private val fennecBaseVersionCode by lazy {
         val format = SimpleDateFormat("yyyyMMddHHmmss", Locale.US)
         val cutoff = format.parse("20141228000000")
-        val build = Date()
+        val build = if (System.getenv("MOZ_BUILD_DATE") != null) format.parse(System.getenv("MOZ_BUILD_DATE")) else Date()
 
         Math.floor((build.time - cutoff.time) / (1000.0 * 60.0 * 60.0)).toInt()
     }