## 1st attempt

!sluongng/fix-list_source_repo ~/work/bazelbuild/bazel> bazel test --config=bb-remote src/test/shell/bazel:srcs_test
INFO: Invocation ID: dfc2fbd5-31cd-4ae9-ac87-d6c6c623923c
INFO: Analyzed target //src/test/shell/bazel:srcs_test (0 packages loaded, 0 targets configured).
INFO: Found 1 test target...
Target //src/test/shell/bazel:srcs_test up-to-date:
  bazel-bin/src/test/shell/bazel/srcs_test
INFO: Elapsed time: 2.910s, Critical Path: 0.00s
INFO: 1 process: 2 action cache hit, 1 internal.
INFO: Build completed successfully, 1 total action
//src/test/shell/bazel:srcs_test                                (cached) PASSED in 0.0s

Executed 0 out of 1 test: 1 test passes.


## 2nd attempt

!sluongng/fix-list_source_repo ~/work/bazelbuild/bazel> bazel test --config=bb-remote src/test/shell/bazel:srcs_test
INFO: Invocation ID: 040b0905-78ef-4f56-94d2-7ea31387b9df
Analyzing: target //src/test/shell/bazel:srcs_test (0 packages loaded, 0 targets configured)

FATAL: bazel crashed due to an internal error. Printing stack trace:
java.lang.NullPointerException
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(Unknown Source)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(Unknown Source)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(Unknown Source)
	at java.base/java.util.Spliterators$ArraySpliterator.forEachRemaining(Unknown Source)
	at java.base/java.util.stream.AbstractPipeline.copyInto(Unknown Source)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source)
	at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(Unknown Source)
	at java.base/java.util.stream.AbstractPipeline.evaluate(Unknown Source)
	at java.base/java.util.stream.ReferencePipeline.collect(Unknown Source)
	at com.google.devtools.build.lib.skyframe.DirectoryTreeDigestFunction.getSubDirTreeDigests(DirectoryTreeDigestFunction.java:140)
	at com.google.devtools.build.lib.skyframe.DirectoryTreeDigestFunction.compute(DirectoryTreeDigestFunction.java:65)
	at com.google.devtools.build.skyframe.ParallelEvaluator.bubbleErrorUp(ParallelEvaluator.java:410)
	at com.google.devtools.build.skyframe.ParallelEvaluator.waitForCompletionAndConstructResult(ParallelEvaluator.java:203)
	at com.google.devtools.build.skyframe.ParallelEvaluator.doMutatingEvaluation(ParallelEvaluator.java:169)
	at com.google.devtools.build.skyframe.ParallelEvaluator.eval(ParallelEvaluator.java:664)
	at com.google.devtools.build.skyframe.AbstractInMemoryMemoizingEvaluator.evaluate(AbstractInMemoryMemoizingEvaluator.java:179)
	at com.google.devtools.build.lib.skyframe.SkyframeExecutor.evaluateBuildDriverKeys(SkyframeExecutor.java:2268)
	at com.google.devtools.build.lib.skyframe.SkyframeBuildView.analyzeAndExecuteTargets(SkyframeBuildView.java:735)
	at com.google.devtools.build.lib.analysis.BuildView.update(BuildView.java:356)
	at com.google.devtools.build.lib.buildtool.AnalysisAndExecutionPhaseRunner.runAnalysisAndExecutionPhase(AnalysisAndExecutionPhaseRunner.java:206)
	at com.google.devtools.build.lib.buildtool.AnalysisAndExecutionPhaseRunner.execute(AnalysisAndExecutionPhaseRunner.java:124)
	at com.google.devtools.build.lib.buildtool.BuildTool.buildTargetsWithMergedAnalysisExecution(BuildTool.java:450)
	at com.google.devtools.build.lib.buildtool.BuildTool.buildTargets(BuildTool.java:247)
	at com.google.devtools.build.lib.buildtool.BuildTool.processRequest(BuildTool.java:722)
	at com.google.devtools.build.lib.buildtool.BuildTool.processRequest(BuildTool.java:690)
	at com.google.devtools.build.lib.runtime.commands.TestCommand.doTest(TestCommand.java:166)
	at com.google.devtools.build.lib.runtime.commands.TestCommand.exec(TestCommand.java:119)
	at com.google.devtools.build.lib.runtime.BlazeCommandDispatcher.execExclusively(BlazeCommandDispatcher.java:687)
	at com.google.devtools.build.lib.runtime.BlazeCommandDispatcher.exec(BlazeCommandDispatcher.java:257)
	at com.google.devtools.build.lib.server.GrpcServerImpl.executeCommand(GrpcServerImpl.java:607)
	at com.google.devtools.build.lib.server.GrpcServerImpl.lambda$run$0(GrpcServerImpl.java:677)
	at io.grpc.Context$1.run(Context.java:566)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.base/java.lang.Thread.run(Unknown Source)
exit 37

--- a/src/test/shell/bazel/list_source_repository.bzl
+++ b/src/test/shell/bazel/list_source_repository.bzl
@@ -38,10 +38,18 @@ genrule(
     "grep -Ev '%s'",
     "sort -u > $@",
   ]),
-)
+    )
 """ % srcs_excludes)

-    rctx.watch_tree(workspace)
+    # Watch everything under the workspace except the VCS metadata. Disable
+    # directory-entry watching during the read to avoid redundant triggers.
+    for entry in workspace.readdir(watch = "no"):
+        if entry.basename == ".git":
+            continue
+        if entry.is_dir:
+            rctx.watch_tree(entry)
+        else:
+            rctx.watch(entry)