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Dump JVM output when bazel fails on Windows #41844

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merged 1 commit into from
Oct 13, 2025
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Dump JVM output when bazel fails on Windows #41844

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11 changes: 11 additions & 0 deletions tools/bazel.bat
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Original file line number Diff line number Diff line change
Expand Up @@ -42,12 +42,16 @@ if exist "!BAZEL_REPO_CONTENTS_CACHE!" (

rem Pass CI-specific options through `.user.bazelrc` so any nested `bazel run` and next `bazel shutdown` also honor them
(
echo startup --connect_timeout_secs=30
echo startup --output_user_root=!BAZEL_OUTPUT_USER_ROOT!
echo common --config=cache
echo common --repo_contents_cache=!ext_repo_contents_cache!
echo build --disk_cache=!BAZEL_DISK_CACHE!
) >"!CI_PROJECT_DIR!\user.bazelrc"

:: Diagnostics: print any stalled client/server before `bazel` execution
>&2 powershell -NoProfile -Command "Get-Process bazel,java -ErrorAction SilentlyContinue | Select-Object 🟡,ProcessName,StartTime"

rem Payload: execute `bazel` and remember exit status
"!BAZEL_REAL!" %*
set "bazel_exit=!errorlevel!"
Expand All @@ -56,6 +60,13 @@ rem Stop `bazel` (if still running) to close files and proceed with cleanup
>&2 "!BAZEL_REAL!" shutdown --ui_event_filters=-info
>&2 del /f /q "!CI_PROJECT_DIR!\user.bazelrc"

:: Diagnostics: print any stalled client/server after `bazel` execution and dump JVM output on failure
>&2 powershell -NoProfile -Command "Get-Process bazel,java -ErrorAction SilentlyContinue | Select-Object 🟡,ProcessName,StartTime"
if !bazel_exit! neq 0 (
>&2 echo 🟡 JVM output:
>&2 type "!BAZEL_OUTPUT_USER_ROOT!\server\jvm.out"
)

rem Reintegrate `--repo_contents_cache` to original directory
if exist "!ext_repo_contents_cache!" (
call :robomove "!ext_repo_contents_cache!" "!BAZEL_REPO_CONTENTS_CACHE!"
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