Expose current repository name to Java with @AutoBazelRepository

src/main/java/com/google/devtools/build/lib/rules/java/JavaCommon.java

@@ -371,9 +371,18 @@ public final void initializeJavacOpts() {
 
   /** Computes javacopts for the current rule. */
   private ImmutableList<String> computeJavacOpts(Collection<String> extraRuleJavacOpts) {
-    return ImmutableList.<String>builder()
-        .addAll(javaToolchain.getJavacOptions(ruleContext))
-        .addAll(extraRuleJavacOpts)
+    ImmutableList.Builder<String> javacOpts =
+        ImmutableList.<String>builder()
+            .addAll(javaToolchain.getJavacOptions(ruleContext))
+            .addAll(extraRuleJavacOpts);
+    if (activePlugins
+        .plugins()
+        .processorClasses()
+        .toSet()
+        .contains("com.google.devtools.build.runfiles.AutoBazelRepositoryProcessor")) {
+      javacOpts.add("-Abazel.repository=" + ruleContext.getRepository().getName());
+    }
+    return javacOpts
         .addAll(computePerPackageJavacOpts(ruleContext, javaToolchain))
         .addAll(addModuleJavacopts(ruleContext))
         .addAll(ruleContext.getExpander().withDataLocations().tokenized("javacopts"))
@@ -538,8 +547,8 @@ public JavaTargetAttributes.Builder initCommon() {
   public JavaTargetAttributes.Builder initCommon(
       Collection<Artifact> extraSrcs, Iterable<String> extraJavacOpts) {
     Preconditions.checkState(javacOpts == null);
-    javacOpts = computeJavacOpts(ImmutableList.copyOf(extraJavacOpts));
     activePlugins = collectPlugins();
+    javacOpts = computeJavacOpts(ImmutableList.copyOf(extraJavacOpts));
 
     JavaTargetAttributes.Builder javaTargetAttributes = new JavaTargetAttributes.Builder(semantics);
     javaCompilationHelper =

src/main/java/com/google/devtools/build/lib/rules/java/JavaInfoBuildHelper.java

@@ -284,6 +284,28 @@ public JavaInfo createJavaCompileAction(
 
     JavaToolchainProvider toolchainProvider = javaToolchain;
 
+    JavaPluginInfo pluginInfo = mergeExportedJavaPluginInfo(plugins, deps);
+    ImmutableList.Builder<String> allJavacOptsBuilder =
+        ImmutableList.<String>builder()
+            .addAll(toolchainProvider.getJavacOptions(starlarkRuleContext.getRuleContext()))
+            .addAll(
+                javaSemantics.getCompatibleJavacOptions(
+                    starlarkRuleContext.getRuleContext(), toolchainProvider));
+    if (pluginInfo
+        .plugins()
+        .processorClasses()
+        .toSet()
+        .contains("com.google.devtools.build.runfiles.AutoBazelRepositoryProcessor")) {
+      allJavacOptsBuilder.add(
+          "-Abazel.repository=" + starlarkRuleContext.getRuleContext().getRepository().getName());
+    }
+    allJavacOptsBuilder
+        .addAll(
+            JavaCommon.computePerPackageJavacOpts(
+                starlarkRuleContext.getRuleContext(), toolchainProvider))
+        .addAll(JavaModuleFlagsProvider.toFlags(addExports, addOpens))
+        .addAll(tokenize(javacOpts));
+
     JavaLibraryHelper helper =
         new JavaLibraryHelper(starlarkRuleContext.getRuleContext())
             .setOutput(outputJar)
@@ -295,18 +317,7 @@ public JavaInfo createJavaCompileAction(
             .setSourcePathEntries(sourcepathEntries)
             .addAdditionalOutputs(annotationProcessorAdditionalOutputs)
             .enableJspecify(enableJSpecify)
-            .setJavacOpts(
-                ImmutableList.<String>builder()
-                    .addAll(toolchainProvider.getJavacOptions(starlarkRuleContext.getRuleContext()))
-                    .addAll(
-                        javaSemantics.getCompatibleJavacOptions(
-                            starlarkRuleContext.getRuleContext(), toolchainProvider))
-                    .addAll(
-                        JavaCommon.computePerPackageJavacOpts(
-                            starlarkRuleContext.getRuleContext(), toolchainProvider))
-                    .addAll(JavaModuleFlagsProvider.toFlags(addExports, addOpens))
-                    .addAll(tokenize(javacOpts))
-                    .build());
+            .setJavacOpts(allJavacOptsBuilder.build());
 
     if (injectingRuleKind != Starlark.NONE) {
       helper.setInjectingRuleKind((String) injectingRuleKind);
@@ -316,7 +327,6 @@ public JavaInfo createJavaCompileAction(
     streamProviders(deps, JavaCompilationArgsProvider.class).forEach(helper::addDep);
     streamProviders(exports, JavaCompilationArgsProvider.class).forEach(helper::addExport);
     helper.setCompilationStrictDepsMode(getStrictDepsMode(Ascii.toUpperCase(strictDepsMode)));
-    JavaPluginInfo pluginInfo = mergeExportedJavaPluginInfo(plugins, deps);
     // Optimization: skip this if there are no annotation processors, to avoid unnecessarily
     // disabling the direct classpath optimization if `enable_annotation_processor = False`
     // but there aren't any annotation processors.

src/test/shell/bazel/bazel_java_test.sh

@@ -1763,5 +1763,191 @@ EOF
   bazel build //java/main:C2 &>"${TEST_log}" || fail "Expected to build"
 }
 
+function test_auto_bazel_repository() {
+  cat >> WORKSPACE <<'EOF'
+local_repository(
+  name = "other_repo",
+  path = "other_repo",
+)
+EOF
+
+  mkdir -p pkg
+  cat > pkg/BUILD.bazel <<'EOF'
+java_library(
+  name = "library",
+  srcs = ["Library.java"],
+  deps = ["@bazel_tools//tools/java/runfiles"],
+  visibility = ["//visibility:public"],
+)
+
+java_binary(
+  name = "binary",
+  srcs = ["Binary.java"],
+  main_class = "com.example.Binary",
+  deps = [
+    ":library",
+    "@bazel_tools//tools/java/runfiles",
+  ],
+)
+
+java_test(
+  name = "test",
+  srcs = ["Test.java"],
+  main_class = "com.example.Test",
+  use_testrunner = False,
+  deps = [
+    ":library",
+    "@bazel_tools//tools/java/runfiles",
+  ],
+)
+EOF
+
+  cat > pkg/Library.java <<'EOF'
+package com.example;
+
+import com.google.devtools.build.runfiles.AutoBazelRepository;
+
+@AutoBazelRepository
+public class Library {
+  public static void printRepositoryName() {
+    System.out.printf("in pkg/Library.java: '%s'%n", AutoBazelRepository_Library.NAME);
+  }
+}
+EOF
+
+  cat > pkg/Binary.java <<'EOF'
+package com.example;
+
+import com.google.devtools.build.runfiles.AutoBazelRepository;
+
+public class Binary {
+  @AutoBazelRepository
+  private static class Class1 {
+  }
+
+  public static void main(String[] args) {
+    System.out.printf("in pkg/Binary.java: '%s'%n", AutoBazelRepository_Binary_Class1.NAME);
+    Library.printRepositoryName();
+  }
+}
+EOF
+
+  cat > pkg/Test.java <<'EOF'
+package com.example;
+
+import com.google.devtools.build.runfiles.AutoBazelRepository;
+
+public class Test {
+  private static class Class1 {
+    @AutoBazelRepository
+    private static class Class2 {
+    }
+  }
+
+  public static void main(String[] args) {
+    System.out.printf("in pkg/Test.java: '%s'%n", AutoBazelRepository_Test_Class1_Class2.NAME);
+    Library.printRepositoryName();
+  }
+}
+EOF
+
+  mkdir -p other_repo
+  touch other_repo/WORKSPACE
+
+  mkdir -p other_repo/pkg
+  cat > other_repo/pkg/BUILD.bazel <<'EOF'
+java_library(
+  name = "library2",
+  srcs = ["Library2.java"],
+  deps = ["@bazel_tools//tools/java/runfiles"],
+)
+
+java_binary(
+  name = "binary",
+  srcs = ["Binary.java"],
+  main_class = "com.example.Binary",
+  deps = [
+    ":library2",
+    "@//pkg:library",
+    "@bazel_tools//tools/java/runfiles",
+  ],
+)
+java_test(
+  name = "test",
+  srcs = ["Test.java"],
+  main_class = "com.example.Test",
+  use_testrunner = False,
+  deps = [
+    ":library2",
+    "@//pkg:library",
+    "@bazel_tools//tools/java/runfiles",
+  ],
+)
+EOF
+
+  cat > other_repo/pkg/Library2.java <<'EOF'
+package com.example;
+
+import com.google.devtools.build.runfiles.AutoBazelRepository;
+
+@AutoBazelRepository
+public class Library2 {
+  public static void printRepositoryName() {
+    System.out.printf("in external/other_repo/pkg/Library2.java: '%s'%n", AutoBazelRepository_Library2.NAME);
+  }
+}
+EOF
+
+  cat > other_repo/pkg/Binary.java <<'EOF'
+package com.example;
+
+import com.google.devtools.build.runfiles.AutoBazelRepository;
+import static com.example.AutoBazelRepository_Binary.NAME;
+
+@AutoBazelRepository
+public class Binary {
+  public static void main(String[] args) {
+    System.out.printf("in external/other_repo/pkg/Binary.java: '%s'%n", NAME);
+    Library2.printRepositoryName();
+    Library.printRepositoryName();
+  }
+}
+EOF
+
+  cat > other_repo/pkg/Test.java <<'EOF'
+package com.example;
+
+import com.google.devtools.build.runfiles.AutoBazelRepository;
+
+@AutoBazelRepository
+public class Test {
+  public static void main(String[] args) {
+    System.out.printf("in external/other_repo/pkg/Test.java: '%s'%n", AutoBazelRepository_Test.NAME);
+    Library2.printRepositoryName();
+    Library.printRepositoryName();
+  }
+}
+EOF
+
+  bazel run //pkg:binary &>"$TEST_log" || fail "Run should succeed"
+  expect_log "in pkg/Binary.java: ''"
+  expect_log "in pkg/Library.java: ''"
+
+  bazel test --test_output=streamed //pkg:test &>"$TEST_log" || fail "Test should succeed"
+  expect_log "in pkg/Test.java: ''"
+  expect_log "in pkg/Library.java: ''"
+
+  bazel run @other_repo//pkg:binary &>"$TEST_log" || fail "Run should succeed"
+  expect_log "in external/other_repo/pkg/Binary.java: 'other_repo'"
+  expect_log "in external/other_repo/pkg/Library2.java: 'other_repo'"
+  expect_log "in pkg/Library.java: ''"
+
+  bazel test --test_output=streamed \
+    @other_repo//pkg:test &>"$TEST_log" || fail "Test should succeed"
+  expect_log "in external/other_repo/pkg/Test.java: 'other_repo'"
+  expect_log "in external/other_repo/pkg/Library2.java: 'other_repo'"
+  expect_log "in pkg/Library.java: ''"
+}
+
 
 run_suite "Java integration tests"

tools/java/runfiles/AutoBazelRepository.java

@@ -0,0 +1,29 @@
+// Copyright 2022 The Bazel Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.devtools.build.runfiles;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Annotating a class {@code Fooer} with this annotation generates a class {@code
+ * AutoBazelRepository_Fooer} defining a {@link String} constant {@code NAME} containing the
+ * canonical name of the repository containing the Bazel target that compiled the annotated class.
+ */
+@Retention(RetentionPolicy.SOURCE)
+@Target(ElementType.TYPE)
+public @interface AutoBazelRepository {}