Fix an issue that `incompatible_remote_build_event_upload_respect_no_… (

#16045)

* Fix an issue that `incompatible_remote_build_event_upload_respect_no_…

…cache` doesn't work with BwtB.

The root cause is we use `Path` as key to check which files are omitted, but it also compares the underlying filesystem. When BwtB is enabled, the filesystem for the file is different so we failed to mark the file as omitted.

This change fixes that by using `PathFragment` as key.

Fixes #15527.

Closes #16023.

PiperOrigin-RevId: 465284879
Change-Id: I49bbd7a6055e0f234b4ac86a224886bd85797f71

* Update ByteStreamBuildEventArtifactUploader changes

Removing the import as it is throwing the error

Co-authored-by: Chi Wang <chiwang@google.com>

src/main/java/com/google/devtools/build/lib/remote/ByteStreamBuildEventArtifactUploader.java

@@ -34,6 +34,7 @@
 import com.google.devtools.build.lib.remote.util.DigestUtil;
 import com.google.devtools.build.lib.remote.util.TracingMetadataUtils;
 import com.google.devtools.build.lib.vfs.Path;
+import com.google.devtools.build.lib.vfs.PathFragment;
 import io.netty.util.AbstractReferenceCounted;
 import io.netty.util.ReferenceCounted;
 import io.reactivex.rxjava3.core.Flowable;
@@ -67,8 +68,8 @@ class ByteStreamBuildEventArtifactUploader extends AbstractReferenceCounted
   private final AtomicBoolean shutdown = new AtomicBoolean();
   private final Scheduler scheduler;
 
-  private final Set<Path> omittedFiles = Sets.newConcurrentHashSet();
-  private final Set<Path> omittedTreeRoots = Sets.newConcurrentHashSet();
+  private final Set<PathFragment> omittedFiles = Sets.newConcurrentHashSet();
+  private final Set<PathFragment> omittedTreeRoots = Sets.newConcurrentHashSet();
 
   ByteStreamBuildEventArtifactUploader(
       Executor executor,
@@ -89,11 +90,11 @@ class ByteStreamBuildEventArtifactUploader extends AbstractReferenceCounted
   }
 
   public void omitFile(Path file) {
-    omittedFiles.add(file);
+    omittedFiles.add(file.asFragment());
   }
 
   public void omitTree(Path treeRoot) {
-    omittedTreeRoots.add(treeRoot);
+    omittedTreeRoots.add(treeRoot.asFragment());
   }
 
   /** Returns {@code true} if Bazel knows that the file is stored on a remote system. */
@@ -153,13 +154,14 @@ private PathMetadata readPathMetadata(Path file) throws IOException {
           /* omitted= */ false);
     }
 
+    PathFragment filePathFragment = file.asFragment();
     boolean omitted = false;
-    if (omittedFiles.contains(file)) {
+    if (omittedFiles.contains(filePathFragment)) {
       omitted = true;
     } else {
-      for (Path treeRoot : omittedTreeRoots) {
+      for (PathFragment treeRoot : omittedTreeRoots) {
         if (file.startsWith(treeRoot)) {
-          omittedFiles.add(file);
+          omittedFiles.add(filePathFragment);
           omitted = true;
         }
       }

src/test/shell/bazel/remote/remote_execution_test.sh

@@ -3536,6 +3536,29 @@ EOF
   expect_log "command.profile.gz.*bytestream://" || fail "should upload profile data"
 }
 
+function test_uploader_respect_no_cache_minimal() {
+  mkdir -p a
+  cat > a/BUILD <<EOF
+genrule(
+  name = 'foo',
+  outs = ["foo.txt"],
+  cmd = "echo \"foo bar\" > \$@",
+  tags = ["no-cache"],
+)
+EOF
+
+  bazel build \
+      --remote_cache=grpc://localhost:${worker_port} \
+      --remote_download_minimal \
+      --incompatible_remote_build_event_upload_respect_no_cache \
+      --build_event_json_file=bep.json \
+      //a:foo >& $TEST_log || fail "Failed to build"
+
+  cat bep.json > $TEST_log
+  expect_not_log "a:foo.*bytestream://" || fail "local files are converted"
+  expect_log "command.profile.gz.*bytestream://" || fail "should upload profile data"
+}
+
 function test_uploader_alias_action_respect_no_cache() {
   mkdir -p a
   cat > a/BUILD <<EOF