Rolling forward Java coverage.

Instead of passing all the runtime jars in the environment variable, we now write them all to a file and store the file path in the env variable, jacoco runner reading the jars from there. Changes on Jacoco runner side are here: https://github.com/bazelbuild/bazel/commit/05418b33dd87d63e2653e594d462b2aedb0e22e5

RELNOTES: A new Java coverage implementation is available. Makes possible coverage for Skylark JVM rules.
PiperOrigin-RevId: 167248966

1 files changed, 91 insertions, 0 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/analysis/actions/LazyWritePathsFileAction.java b/src/main/java/com/google/devtools/build/lib/analysis/actions/LazyWritePathsFileAction.java
new file mode 100644
index 0000000000..d349c6c02e
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/analysis/actions/LazyWritePathsFileAction.java
@@ -0,0 +1,91 @@
+// Copyright 2017 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.lib.analysis.actions;
+
+import static java.nio.charset.StandardCharsets.UTF_8;
+
+import com.google.common.collect.ImmutableSet;
+import com.google.devtools.build.lib.actions.ActionExecutionContext;
+import com.google.devtools.build.lib.actions.ActionOwner;
+import com.google.devtools.build.lib.actions.Artifact;
+import com.google.devtools.build.lib.collect.nestedset.NestedSet;
+import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder;
+import com.google.devtools.build.lib.util.Fingerprint;
+import java.io.IOException;
+import java.io.OutputStream;
+
+/**
+ * Lazily writes the exec path of the given files separated by newline into a specified output file.
+ */
+public final class LazyWritePathsFileAction extends AbstractFileWriteAction {
+  private static final String GUID = "6be94d90-96f3-4bec-8104-1fb08abc2546";
+
+  private final NestedSet<Artifact> files;
+  private final boolean includeOnlyIfSource;
+
+  public LazyWritePathsFileAction(
+      ActionOwner owner, Artifact output, NestedSet<Artifact> files, boolean includeOnlyIfSource) {
+    super(owner, Artifact.NO_ARTIFACTS, output, false);
+    this.files = NestedSetBuilder.fromNestedSet(files).build();
+    this.includeOnlyIfSource = includeOnlyIfSource;
+  }
+
+  public LazyWritePathsFileAction(
+      ActionOwner owner, Artifact output,
+      ImmutableSet<Artifact> files,
+      boolean includeOnlyIfSource) {
+    super(owner, Artifact.NO_ARTIFACTS, output, false);
+    this.files = NestedSetBuilder.<Artifact>stableOrder().addAll(files).build();
+    this.includeOnlyIfSource = includeOnlyIfSource;
+  }
+
+  @Override
+  public DeterministicWriter newDeterministicWriter(ActionExecutionContext ctx) {
+    return new DeterministicWriter() {
+      @Override
+      public void writeOutputFile(OutputStream out) throws IOException {
+        out.write(getContents().toString().getBytes(UTF_8));
+      }
+    };
+  }
+
+  /**
+   * Computes the Action key for this action by computing the fingerprint for the file contents.
+   */
+  @Override
+  protected String computeKey() {
+    Fingerprint f = new Fingerprint();
+    f.addString(GUID);
+    f.addBoolean(includeOnlyIfSource);
+    f.addString(getContents());
+    return f.hexDigestAndReset();
+  }
+
+  private String getContents() {
+    StringBuilder stringBuilder = new StringBuilder();
+    for (Artifact file : files) {
+      if (includeOnlyIfSource) {
+        if (file.isSourceArtifact()) {
+          stringBuilder.append(file.getRootRelativePathString());
+          stringBuilder.append("\n");
+        }
+      } else {
+        stringBuilder.append(file.getRootRelativePathString());
+        stringBuilder.append("\n");
+      }
+    }
+    return stringBuilder.toString();
+  }
+}
\ No newline at end of file