Automated rollback of commit 28bd997.

*** Reason for rollback ***

#4625

What I thought was a short fix is turning into a long hunt, so I better roll this back to get the build green again.

I'm not yet 100% certain what the interactions are, but there's a chance that it's back to the drawing board.

*** Original change description ***

Fixing test-setup.sh occasionally missing stdout/stderr, on systems where "tail --pid" is supported.

The solutions aren't mine, the new test was taken from Ola's unknown commit and the way to avoid race condition courtesy of sethkoehler@

Mitigates #4608 for compatible Linux systems.

TESTED=manual scripts and new test case.
RELNOTES: None
PiperOrigin-RevId: 185482604

src/test/shell/bazel/bazel_test_test.sh

@@ -339,41 +339,6 @@ EOF
 \?\?\?\?\?<!CDATA\[\]\]>\]\]<!\[CDATA\[>\]\]></system-out>'
 }
 
-# Tests that the test.xml and test.log are correct and the test does not
-# hang when the test launches a subprocess.
-function test_subprocess_non_timeout() {
-  mkdir -p dir
-
-  cat <<'EOF' > dir/test.sh
-echo "Pretending to sleep..."
-sleep 600 &
-echo "Finished!" >&2
-exit 0
-EOF
-
-  chmod +x dir/test.sh
-
-  cat <<'EOF' > dir/BUILD
-  sh_test(
-    name = "test",
-    timeout = "short",
-    srcs = [ "test.sh" ],
-  )
-EOF
-
-  bazel test --test_output=streamed --test_timeout=2 \
-     //dir:test &> $TEST_log || fail "expected success"
-
-  xml_log=bazel-testlogs/dir/test/test.xml
-  expect_log 'Pretending to sleep...'
-  expect_log 'Finished!'
-  [ -s "${xml_log}" ] || fail "${xml_log} was not present after test"
-  cp "${xml_log}" $TEST_log
-  expect_log_once "testcase"
-  expect_log 'Pretending to sleep...'
-  expect_log 'Finished!'
-}
-
 # Check that fallback xml output is correctly generated for sharded tests.
 function test_xml_fallback_for_sharded_test() {
   mkdir -p dir

tools/test/test-setup.sh

@@ -218,30 +218,10 @@ for signal in $signals; do
 done
 start=$(date +%s)
 
-# Check if we have tail --pid option
-dummy=1 &
-pid=$!
-has_tail=true
-tail -fq --pid $pid -s 0.001 /dev/null &> /dev/null || has_tail=false
-
-if [ "$has_tail" == true ] && [  -z "$no_echo" ]; then
-  touch "${XML_OUTPUT_FILE}.log"
-  if [ -z "$COVERAGE_DIR" ]; then
-    "${TEST_PATH}" "$@" &>"${XML_OUTPUT_FILE}.log" &
-    pid=$!
-  else
-    "$1" "$TEST_PATH" "${@:3}" &> "${XML_OUTPUT_FILE}.log" &
-    pid=$!
-  fi
-  tail -fq --pid $pid -s 0.001 "${XML_OUTPUT_FILE}.log"
-  wait $pid
-  exitCode=$?
+if [ -z "$COVERAGE_DIR" ]; then
+  "${TEST_PATH}" "$@" 2> >(tee -a "${XML_OUTPUT_FILE}.log" >&2) 1> >(tee -a "${XML_OUTPUT_FILE}.log") 2>&1 || exitCode=$?
 else
-  if [ -z "$COVERAGE_DIR" ]; then
-    "${TEST_PATH}" "$@" 2> >(tee -a "${XML_OUTPUT_FILE}.log" >&2) 1> >(tee -a "${XML_OUTPUT_FILE}.log") 2>&1 || exitCode=$?
-  else
-    "$1" "$TEST_PATH" "${@:3}" 2> >(tee -a "${XML_OUTPUT_FILE}.log" >&2) 1> >(tee -a "${XML_OUTPUT_FILE}.log") 2>&1 || exitCode=$?
-  fi
+  "$1" "$TEST_PATH" "${@:3}" 2> >(tee -a "${XML_OUTPUT_FILE}.log" >&2) 1> >(tee -a "${XML_OUTPUT_FILE}.log") 2>&1 || exitCode=$?
 fi
 
 for signal in $signals; do