internal/node/launcher.sh - third_party/github/bazel-contrib/rules_nodejs - Git at Google

 #!/usr/bin/env bash
 # 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.

 # --- begin runfiles.bash initialization v2 ---
 # Copy-pasted from the Bazel Bash runfiles library v2.
 set -uo pipefail; f=build_bazel_rules_nodejs/third_party/github.com/bazelbuild/bazel/tools/bash/runfiles/runfiles.bash
 source "${RUNFILES_DIR:-/dev/null}/$f" 2>/dev/null || \
   source "$(grep -sm1 "^$f " "${RUNFILES_MANIFEST_FILE:-/dev/null}" | cut -f2- -d' ')" 2>/dev/null || \
   source "$0.runfiles/$f" 2>/dev/null || \
   source "$(grep -sm1 "^$f " "$0.runfiles_manifest" | cut -f2- -d' ')" 2>/dev/null || \
   source "$(grep -sm1 "^$f " "$0.exe.runfiles_manifest" | cut -f2- -d' ')" 2>/dev/null || \
   { echo>&2 "ERROR: cannot find $f"; exit 1; }; f=; set -e
 # --- end runfiles.bash initialization v2 ---

 # --- begin RUNFILES initialization ---
 # Find our runfiles as ${PWD}/${RUNFILES_DIR} is not always correct.
 # We need this to launch node with the correct entry point.
 #
 # Call this program X. X was generated by a genrule and may be invoked
 # in many ways:
 #   1a) directly by a user, with $0 in the output tree
 #   1b) via 'bazel run' (similar to case 1a)
 #   2) directly by a user, with $0 in X's runfiles
 #   3) by another program Y which has a data dependency on X, with $0 in Y's
 #      runfiles
 #   4a) via 'bazel test'
 #   4b) case 3 in the context of a test
 #   5a) by a genrule cmd, with $0 in the output tree
 #   6a) case 3 in the context of a genrule
 #
 # For case 1, $0 will be a regular file, and the runfiles will be
 # at $0.runfiles.
 # For case 2 or 3, $0 will be a symlink to the file seen in case 1.
 # For case 4, $TEST_SRCDIR should already be set to the runfiles by
 # blaze.
 # Case 5a is handled like case 1.
 # Case 6a is handled like case 3.
 if [[ -n "${RUNFILES_MANIFEST_ONLY:-}" ]]; then
   # Windows only has a manifest file instead of symlinks.
   RUNFILES=${RUNFILES_MANIFEST_FILE%/MANIFEST}
 elif [[ -n "${TEST_SRCDIR:-}" ]]; then
   # Case 4, bazel has identified runfiles for us.
   RUNFILES="${TEST_SRCDIR:-}"
 else
   case "$0" in
   /*) self="$0" ;;
   *) self="$PWD/$0" ;;
   esac
   while true; do
     if [[ -e "$self.runfiles" ]]; then
       RUNFILES="$self.runfiles"
       break
     fi

     if [[ $self == *.runfiles/* ]]; then
       RUNFILES="${self%%.runfiles/*}.runfiles"
       # don't break; this is a last resort for case 6b
     fi

     if [[ ! -L "$self" ]]; then
       break;
     fi

     readlink="$(readlink "$self")"
     if [[ "$readlink" = /* ]]; then
       self="$readlink"
     else
       # resolve relative symlink
       self="${self%%/*}/$readlink"
     fi
   done

   if [[ -z "$RUNFILES" ]]; then
     echo " >>>> FAIL: RUNFILES environment variable is not set. <<<<" >&2
     exit 1
   fi
 fi
 export RUNFILES
 # --- end RUNFILES initialization ---

 TEMPLATED_env_vars

 # Note: for debugging it is useful to see what files are actually present
 # This redirects to stderr so it doesn't interfere with Bazel's worker protocol
 # find . -name thingImLookingFor 1>&2

 readonly vendored_node="TEMPLATED_vendored_node"

 if [ -n "${vendored_node}" ]; then
   # Use the vendored node path
   readonly node=$(rlocation "${vendored_node}")

   if [ ! -f "${node}" ]; then
       printf "\n>>>> FAIL: The vendored node binary '${vendored_node}' not found in runfiles. <<<<\n\n" >&2
       exit 1
   fi
 else
   # Check environment for which node path to use
   unameOs="$(uname -s)"
   unameArch="$(uname -m)"
   case "${unameOs}" in
       Linux*)     machine=linux ;;
       Darwin*)    machine=darwin ;;
       CYGWIN*)    machine=windows ;;
       MINGW*)     machine=windows ;;
       MSYS_NT*)   machine=windows ;;
       *)          machine=linux
                   printf "\nUnrecongized uname '${unameOs}'; defaulting to use node for linux.\n" >&2
                   printf "Please file an issue to https://github.com/bazelbuild/rules_nodejs/issues if \n" >&2
                   printf "you would like to add your platform to the supported rules_nodejs node platforms.\n\n" >&2
                   ;;
   esac

   case "${machine}" in
     # The following paths must match up with _download_node in node_repositories
     darwin) readonly node_toolchain="nodejs_darwin_amd64/bin/nodejs/bin/node" ;;
     windows) readonly node_toolchain="nodejs_windows_amd64/bin/nodejs/node.exe" ;;
     *)
       case "${unameArch}" in
         aarch64*) readonly node_toolchain="nodejs_linux_arm64/bin/nodejs/bin/node" ;;
         s390x*) readonly node_toolchain="nodejs_linux_s390x/bin/nodejs/bin/node" ;;
         *) readonly node_toolchain="nodejs_linux_amd64/bin/nodejs/bin/node" ;;
       esac
       ;;
   esac

   readonly node=$(rlocation "${node_toolchain}")

   if [ ! -f "${node}" ]; then
       printf "\n>>>> FAIL: The node binary '${node_toolchain}' not found in runfiles.\n" >&2
       printf "This node toolchain was chosen based on your uname '${unameOs} ${unameArch}'.\n" >&2
       printf "Please file an issue to https://github.com/bazelbuild/rules_nodejs/issues if \n" >&2
       printf "you would like to add your platform to the supported rules_nodejs node platforms. <<<<\n\n" >&2
       exit 1
   fi
 fi

 # Export the location of the runfiles helpers script
 export BAZEL_NODE_RUNFILES_HELPER=$(rlocation "TEMPLATED_runfiles_helper_script")
 if [[ "${BAZEL_NODE_RUNFILES_HELPER}" != /* ]] && [[ ! "${BAZEL_NODE_RUNFILES_HELPER}" =~ ^[A-Z]:[\\/] ]]; then
   export BAZEL_NODE_RUNFILES_HELPER=$(pwd)/${BAZEL_NODE_RUNFILES_HELPER}
 fi

 # Export the location of the require patch script as it can be used to bootstrap
 # node require patch if needed
 export BAZEL_NODE_PATCH_REQUIRE=$(rlocation "TEMPLATED_require_patch_script")
 if [[ "${BAZEL_NODE_PATCH_REQUIRE}" != /* ]] && [[ ! "${BAZEL_NODE_PATCH_REQUIRE}" =~ ^[A-Z]:[\\/] ]]; then
   export BAZEL_NODE_PATCH_REQUIRE=$(pwd)/${BAZEL_NODE_PATCH_REQUIRE}
 fi

 readonly repository_args=$(rlocation "TEMPLATED_repository_args")
 readonly lcov_merger_script=$(rlocation "TEMPLATED_lcov_merger_script")

 source $repository_args

 ARGS=()
 LAUNCHER_NODE_OPTIONS=($NODE_REPOSITORY_ARGS)
 USER_NODE_OPTIONS=()
 ALL_ARGS=(TEMPLATED_args "$@")
 STDOUT_CAPTURE=""
 STDERR_CAPTURE=""
 EXIT_CODE_CAPTURE=""

 RUN_LINKER=true
 NODE_PATCHES=true
 # TODO(alex): change the default to false
 PATCH_REQUIRE=true
 for ARG in ${ALL_ARGS[@]+"${ALL_ARGS[@]}"}; do
   case "$ARG" in
     # Supply custom linker arguments for first-party dependencies
     --bazel_node_modules_manifest=*) MODULES_MANIFEST="${ARG#--bazel_node_modules_manifest=}" ;;
     # Captures stdout of the node process to the file specified
     --bazel_capture_stdout=*) STDOUT_CAPTURE="${ARG#--bazel_capture_stdout=}" ;;
     # Captures stderr of the node process to the file specified
     --bazel_capture_stderr=*) STDERR_CAPTURE="${ARG#--bazel_capture_stderr=}" ;;
     # Captures the exit code of the node process to the file specified
     --bazel_capture_exit_code=*) EXIT_CODE_CAPTURE="${ARG#--bazel_capture_exit_code=}" ;;
     # Disable the node_loader.js monkey patches for require()
     # Note that this means you need an explicit runfiles helper library
     --nobazel_patch_module_resolver) PATCH_REQUIRE=false ;;
     # Enable the node_loader.js monkey patches for require()
     # Currently a no-op, but specifying this makes the behavior unchanged when we update
     # the default for PATCH_REQUIRE above
     --bazel_patch_module_resolver) PATCH_REQUIRE=true ;;
     # Disable the --require node-patches (undocumented and unused; only here as an escape value)
     --nobazel_node_patches) NODE_PATCHES=false ;;
     # Disable the linker pre-process (undocumented and unused; only here as an escape value)
     --nobazel_run_linker) RUN_LINKER=false ;;
     # Let users pass through arguments to node itself
     --node_options=*) USER_NODE_OPTIONS+=( "${ARG#--node_options=}" ) ;;
     # Remaining argv is collected to pass to the program
     *) ARGS+=( "$ARG" )
   esac
 done

 # Link the first-party modules into node_modules directory before running the actual program
 if [ "$RUN_LINKER" = true ]; then
   link_modules_script=$(rlocation "TEMPLATED_link_modules_script")
   # For programs which are called with bazel run or bazel test, there will be no additional runtime
   # dependencies to link, so we use the default modules_manifest which has only the static dependencies
   # of the binary itself.
   MODULES_MANIFEST=${MODULES_MANIFEST:-$(rlocation "TEMPLATED_modules_manifest")}
   "${node}" "${link_modules_script}" "${MODULES_MANIFEST:-}"
 fi

 if [ "$NODE_PATCHES" = true ]; then
   node_patches_script=$(rlocation "TEMPLATED_node_patches_script")
   # Node's --require option assumes that a non-absolute path not starting with `.` is
   # a module, so that you can do --require=source-map-support/register
   # So if the require script is not absolute, we must make it so
   case "${node_patches_script}" in
     # Absolute path on unix
     /*          ) ;;
     # Absolute path on Windows, e.g. C:/path/to/thing
     [a-zA-Z]:/* ) ;;
     # Otherwise it needs to be made relative
     *           ) node_patches_script="./${node_patches_script}" ;;
   esac
   LAUNCHER_NODE_OPTIONS+=( "--require" "$node_patches_script" )
 fi

 if [ "$PATCH_REQUIRE" = true ]; then
   require_patch_script=${BAZEL_NODE_PATCH_REQUIRE}
   # See comment above
   case "${require_patch_script}" in
     # Absolute path on unix
     /*          ) ;;
     # Absolute path on Windows, e.g. C:/path/to/thing
     [a-zA-Z]:/* ) ;;
     # Otherwise it needs to be made relative
     *           ) require_patch_script="./${require_patch_script}" ;;
   esac
   LAUNCHER_NODE_OPTIONS+=( "--require" "$require_patch_script" )
   # Change the entry point to be the loader.js script so we run code before node
   MAIN=$(rlocation "TEMPLATED_loader_script")
 else
   # Entry point is the user-supplied script
   MAIN=TEMPLATED_entry_point_execroot_path
   # TODO: after we link-all-bins we should not need this extra lookup
   if [[ ! -f "$MAIN" ]]; then
     MAIN=TEMPLATED_entry_point_manifest_path
   fi
 fi

 # Tell the node_patches_script that programs should not escape the execroot
 # Bazel always sets the PWD to execroot/my_wksp so we go up one directory.
 export BAZEL_PATCH_ROOT=$(dirname $PWD)

 # Set all bazel managed node_modules directories as guarded so no symlinks may
 # escape and no symlinks may enter
 if [[ "$PWD" == *"/bazel-out/"* ]]; then
   # We in runfiles, find the execroot.
   # Look for `bazel-out` which is used to determine the the path to `execroot/my_wksp`. This works in
   # all cases including on rbe where the execroot is a path such as `/b/f/w`. For example, when in
   # runfiles on rbe, bazel runs the process in a directory such as
   # `/b/f/w/bazel-out/k8-fastbuild/bin/path/to/pkg/some_test.sh.runfiles/my_wksp`. From here we can
   # determine the execroot `b/f/w` by finding the first instance of bazel-out.
   readonly bazel_out="/bazel-out/"
   readonly rest=${PWD#*$bazel_out}
   readonly index=$(( ${#PWD} - ${#rest} - ${#bazel_out} ))
   if [[ ${index} < 0 ]]; then
     echo "No 'bazel-out' folder found in path '${PWD}'!"
     exit 1
   fi
   readonly execroot=${PWD:0:${index}}
   export BAZEL_PATCH_GUARDS="${execroot}/node_modules"
 else
   # We are in execroot or in some other context all together such as a nodejs_image or a manually
   # run nodejs_binary. If this is execroot then linker node_modules is in the PWD. If this another
   # context then it is safe to assume the node_modules are there and guard that directory if it exists.
   export BAZEL_PATCH_GUARDS="${PWD}/node_modules"
 fi
 if [[ -n "${BAZEL_NODE_MODULES_ROOT:-}" ]]; then
   if [[ "${BAZEL_NODE_MODULES_ROOT}" != "${BAZEL_WORKSPACE}/node_modules" ]]; then
     # If BAZEL_NODE_MODULES_ROOT is set and it is not , add it to the list of bazel patch guards
     # Also, add the external/${BAZEL_NODE_MODULES_ROOT} which is the correct path under execroot
     # and under runfiles it is the legacy external runfiles path
     export BAZEL_PATCH_GUARDS="${BAZEL_PATCH_GUARDS},${BAZEL_PATCH_ROOT}/${BAZEL_NODE_MODULES_ROOT},${PWD}/external/${BAZEL_NODE_MODULES_ROOT}"
   fi
 fi

 # The EXPECTED_EXIT_CODE lets us write bazel tests which assert that
 # a binary fails to run. Otherwise any failure would make such a test
 # fail before we could assert that we expected that failure.
 readonly EXPECTED_EXIT_CODE="TEMPLATED_expected_exit_code"

 if [[ -n "${COVERAGE_DIR:-}" ]]; then
   if [[ -n "${VERBOSE_LOGS:-}" ]]; then
     echo "Turning on node coverage with NODE_V8_COVERAGE=${COVERAGE_DIR}"
   fi
   # Setting NODE_V8_COVERAGE=${COVERAGE_DIR} causes NodeJS to write coverage
   # information our to the COVERAGE_DIR once the process exits
   export NODE_V8_COVERAGE=${COVERAGE_DIR}
 fi

 # Bash does not forward termination signals to any child process when
 # running in docker so need to manually trap and forward the signals
 _term() {
   kill -TERM "${child}" 2>/dev/null
 }

 _int() {
   kill -INT "${child}" 2>/dev/null
 }

 # Execute the main program
 set +e

 if [[ -n "${STDOUT_CAPTURE}" ]] && [[ -n "${STDERR_CAPTURE}" ]]; then
   "${node}" ${LAUNCHER_NODE_OPTIONS[@]+"${LAUNCHER_NODE_OPTIONS[@]}"} ${USER_NODE_OPTIONS[@]+"${USER_NODE_OPTIONS[@]}"} "${MAIN}" ${ARGS[@]+"${ARGS[@]}"} <&0 >$STDOUT_CAPTURE 2>$STDERR_CAPTURE &
 elif [[ -n "${STDOUT_CAPTURE}" ]]; then
   "${node}" ${LAUNCHER_NODE_OPTIONS[@]+"${LAUNCHER_NODE_OPTIONS[@]}"} ${USER_NODE_OPTIONS[@]+"${USER_NODE_OPTIONS[@]}"} "${MAIN}" ${ARGS[@]+"${ARGS[@]}"} <&0 >$STDOUT_CAPTURE &
 elif [[ -n "${STDERR_CAPTURE}" ]]; then
   "${node}" ${LAUNCHER_NODE_OPTIONS[@]+"${LAUNCHER_NODE_OPTIONS[@]}"} ${USER_NODE_OPTIONS[@]+"${USER_NODE_OPTIONS[@]}"} "${MAIN}" ${ARGS[@]+"${ARGS[@]}"} <&0 2>$STDERR_CAPTURE &
 else
   "${node}" ${LAUNCHER_NODE_OPTIONS[@]+"${LAUNCHER_NODE_OPTIONS[@]}"} ${USER_NODE_OPTIONS[@]+"${USER_NODE_OPTIONS[@]}"} "${MAIN}" ${ARGS[@]+"${ARGS[@]}"} <&0 &
 fi

 readonly child=$!
 trap _term SIGTERM
 trap _int SIGINT
 wait "${child}"
 RESULT="$?"
 set -e

 if [[ -n "${EXIT_CODE_CAPTURE}" ]]; then
   echo "${RESULT}" > "${EXIT_CODE_CAPTURE}"
 fi

 if [ "${EXPECTED_EXIT_CODE}" != "0" ]; then
   if [ ${RESULT} != ${EXPECTED_EXIT_CODE} ]; then
     echo "Expected exit code to be ${EXPECTED_EXIT_CODE}, but got ${RESULT}" >&2
     if [ "${RESULT}" -eq "0" ]; then
       # This exit code is handled specially by Bazel:
       # https://github.com/bazelbuild/bazel/blob/486206012a664ecb20bdb196a681efc9a9825049/src/main/java/com/google/devtools/build/lib/util/ExitCode.java#L44
       readonly BAZEL_EXIT_TESTS_FAILED=3;
       exit ${BAZEL_EXIT_TESTS_FAILED}
     fi
   else
     exit 0
   fi
 fi

 # Do not collect coverage for failed tests
 if [ ${RESULT} -ne 0 ]; then
   if [[ -n "${EXIT_CODE_CAPTURE}" ]]; then
     exit 0
   else
     exit ${RESULT}
   fi
 fi

 # Post process the coverage information after the process has exited
 if [[ -n "${COVERAGE_DIR:-}" ]]; then
   if [[ -n "${VERBOSE_LOGS:-}" ]]; then
     echo "Running coverage lcov merger script with arguments"
     echo "  --coverage_dir="${COVERAGE_DIR}""
     echo "  --output_file="${COVERAGE_OUTPUT_FILE}""
     echo "  --source_file_manifest="${COVERAGE_MANIFEST}""
   fi

   set +e
   "${node}" ${LAUNCHER_NODE_OPTIONS[@]+"${LAUNCHER_NODE_OPTIONS[@]}"} "${lcov_merger_script}" --coverage_dir="${COVERAGE_DIR}" --output_file="${COVERAGE_OUTPUT_FILE}" --source_file_manifest="${COVERAGE_MANIFEST}"
   RESULT="$?"
   set -e

   if [[ -n "${EXIT_CODE_CAPTURE}" ]]; then
     echo "${RESULT}" > "${EXIT_CODE_CAPTURE}"
   fi
 fi

 if [[ -n "${EXIT_CODE_CAPTURE}" ]]; then
   exit 0
 else
   exit ${RESULT}
 fi
	#!/usr/bin/env bash
	# 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.

	# --- begin runfiles.bash initialization v2 ---
	# Copy-pasted from the Bazel Bash runfiles library v2.
	set -uo pipefail; f=build_bazel_rules_nodejs/third_party/github.com/bazelbuild/bazel/tools/bash/runfiles/runfiles.bash
	source "${RUNFILES_DIR:-/dev/null}/$f" 2>/dev/null \|\| \
	source "$(grep -sm1 "^$f " "${RUNFILES_MANIFEST_FILE:-/dev/null}" \| cut -f2- -d' ')" 2>/dev/null \|\| \
	source "$0.runfiles/$f" 2>/dev/null \|\| \
	source "$(grep -sm1 "^$f " "$0.runfiles_manifest" \| cut -f2- -d' ')" 2>/dev/null \|\| \
	source "$(grep -sm1 "^$f " "$0.exe.runfiles_manifest" \| cut -f2- -d' ')" 2>/dev/null \|\| \
	{ echo>&2 "ERROR: cannot find $f"; exit 1; }; f=; set -e
	# --- end runfiles.bash initialization v2 ---

	# --- begin RUNFILES initialization ---
	# Find our runfiles as ${PWD}/${RUNFILES_DIR} is not always correct.
	# We need this to launch node with the correct entry point.
	#
	# Call this program X. X was generated by a genrule and may be invoked
	# in many ways:
	# 1a) directly by a user, with $0 in the output tree
	# 1b) via 'bazel run' (similar to case 1a)
	# 2) directly by a user, with $0 in X's runfiles
	# 3) by another program Y which has a data dependency on X, with $0 in Y's
	# runfiles
	# 4a) via 'bazel test'
	# 4b) case 3 in the context of a test
	# 5a) by a genrule cmd, with $0 in the output tree
	# 6a) case 3 in the context of a genrule
	#
	# For case 1, $0 will be a regular file, and the runfiles will be
	# at $0.runfiles.
	# For case 2 or 3, $0 will be a symlink to the file seen in case 1.
	# For case 4, $TEST_SRCDIR should already be set to the runfiles by
	# blaze.
	# Case 5a is handled like case 1.
	# Case 6a is handled like case 3.
	if [[ -n "${RUNFILES_MANIFEST_ONLY:-}" ]]; then
	# Windows only has a manifest file instead of symlinks.
	RUNFILES=${RUNFILES_MANIFEST_FILE%/MANIFEST}
	elif [[ -n "${TEST_SRCDIR:-}" ]]; then
	# Case 4, bazel has identified runfiles for us.
	RUNFILES="${TEST_SRCDIR:-}"
	else
	case "$0" in
	/*) self="$0" ;;
	*) self="$PWD/$0" ;;
	esac
	while true; do
	if [[ -e "$self.runfiles" ]]; then
	RUNFILES="$self.runfiles"
	break
	fi

	if [[ $self == .runfiles/ ]]; then
	RUNFILES="${self%%.runfiles/*}.runfiles"
	# don't break; this is a last resort for case 6b
	fi

	if [[ ! -L "$self" ]]; then
	break;
	fi

	readlink="$(readlink "$self")"
	if [[ "$readlink" = /* ]]; then
	self="$readlink"
	else
	# resolve relative symlink
	self="${self%%/*}/$readlink"
	fi
	done

	if [[ -z "$RUNFILES" ]]; then
	echo " >>>> FAIL: RUNFILES environment variable is not set. <<<<" >&2
	exit 1
	fi
	fi
	export RUNFILES
	# --- end RUNFILES initialization ---

	TEMPLATED_env_vars

	# Note: for debugging it is useful to see what files are actually present
	# This redirects to stderr so it doesn't interfere with Bazel's worker protocol
	# find . -name thingImLookingFor 1>&2

	readonly vendored_node="TEMPLATED_vendored_node"

	if [ -n "${vendored_node}" ]; then
	# Use the vendored node path
	readonly node=$(rlocation "${vendored_node}")

	if [ ! -f "${node}" ]; then
	printf "\n>>>> FAIL: The vendored node binary '${vendored_node}' not found in runfiles. <<<<\n\n" >&2
	exit 1
	fi
	else
	# Check environment for which node path to use
	unameOs="$(uname -s)"
	unameArch="$(uname -m)"
	case "${unameOs}" in
	Linux*) machine=linux ;;
	Darwin*) machine=darwin ;;
	CYGWIN*) machine=windows ;;
	MINGW*) machine=windows ;;
	MSYS_NT*) machine=windows ;;
	*) machine=linux
	printf "\nUnrecongized uname '${unameOs}'; defaulting to use node for linux.\n" >&2
	printf "Please file an issue to https://github.com/bazelbuild/rules_nodejs/issues if \n" >&2
	printf "you would like to add your platform to the supported rules_nodejs node platforms.\n\n" >&2
	;;
	esac

	case "${machine}" in
	# The following paths must match up with _download_node in node_repositories
	darwin) readonly node_toolchain="nodejs_darwin_amd64/bin/nodejs/bin/node" ;;
	windows) readonly node_toolchain="nodejs_windows_amd64/bin/nodejs/node.exe" ;;
	*)
	case "${unameArch}" in
	aarch64*) readonly node_toolchain="nodejs_linux_arm64/bin/nodejs/bin/node" ;;
	s390x*) readonly node_toolchain="nodejs_linux_s390x/bin/nodejs/bin/node" ;;
	*) readonly node_toolchain="nodejs_linux_amd64/bin/nodejs/bin/node" ;;
	esac
	;;
	esac

	readonly node=$(rlocation "${node_toolchain}")

	if [ ! -f "${node}" ]; then
	printf "\n>>>> FAIL: The node binary '${node_toolchain}' not found in runfiles.\n" >&2
	printf "This node toolchain was chosen based on your uname '${unameOs} ${unameArch}'.\n" >&2
	printf "Please file an issue to https://github.com/bazelbuild/rules_nodejs/issues if \n" >&2
	printf "you would like to add your platform to the supported rules_nodejs node platforms. <<<<\n\n" >&2
	exit 1
	fi
	fi

	# Export the location of the runfiles helpers script
	export BAZEL_NODE_RUNFILES_HELPER=$(rlocation "TEMPLATED_runfiles_helper_script")
	if [[ "${BAZEL_NODE_RUNFILES_HELPER}" != /* ]] && [[ ! "${BAZEL_NODE_RUNFILES_HELPER}" =~ ^[A-Z]:[\\/] ]]; then
	export BAZEL_NODE_RUNFILES_HELPER=$(pwd)/${BAZEL_NODE_RUNFILES_HELPER}
	fi

	# Export the location of the require patch script as it can be used to bootstrap
	# node require patch if needed
	export BAZEL_NODE_PATCH_REQUIRE=$(rlocation "TEMPLATED_require_patch_script")
	if [[ "${BAZEL_NODE_PATCH_REQUIRE}" != /* ]] && [[ ! "${BAZEL_NODE_PATCH_REQUIRE}" =~ ^[A-Z]:[\\/] ]]; then
	export BAZEL_NODE_PATCH_REQUIRE=$(pwd)/${BAZEL_NODE_PATCH_REQUIRE}
	fi

	readonly repository_args=$(rlocation "TEMPLATED_repository_args")
	readonly lcov_merger_script=$(rlocation "TEMPLATED_lcov_merger_script")

	source $repository_args

	ARGS=()
	LAUNCHER_NODE_OPTIONS=($NODE_REPOSITORY_ARGS)
	USER_NODE_OPTIONS=()
	ALL_ARGS=(TEMPLATED_args "$@")
	STDOUT_CAPTURE=""
	STDERR_CAPTURE=""
	EXIT_CODE_CAPTURE=""

	RUN_LINKER=true
	NODE_PATCHES=true
	# TODO(alex): change the default to false
	PATCH_REQUIRE=true
	for ARG in ${ALL_ARGS[@]+"${ALL_ARGS[@]}"}; do
	case "$ARG" in
	# Supply custom linker arguments for first-party dependencies
	--bazel_node_modules_manifest=*) MODULES_MANIFEST="${ARG#--bazel_node_modules_manifest=}" ;;
	# Captures stdout of the node process to the file specified
	--bazel_capture_stdout=*) STDOUT_CAPTURE="${ARG#--bazel_capture_stdout=}" ;;
	# Captures stderr of the node process to the file specified
	--bazel_capture_stderr=*) STDERR_CAPTURE="${ARG#--bazel_capture_stderr=}" ;;
	# Captures the exit code of the node process to the file specified
	--bazel_capture_exit_code=*) EXIT_CODE_CAPTURE="${ARG#--bazel_capture_exit_code=}" ;;
	# Disable the node_loader.js monkey patches for require()
	# Note that this means you need an explicit runfiles helper library
	--nobazel_patch_module_resolver) PATCH_REQUIRE=false ;;
	# Enable the node_loader.js monkey patches for require()
	# Currently a no-op, but specifying this makes the behavior unchanged when we update
	# the default for PATCH_REQUIRE above
	--bazel_patch_module_resolver) PATCH_REQUIRE=true ;;
	# Disable the --require node-patches (undocumented and unused; only here as an escape value)
	--nobazel_node_patches) NODE_PATCHES=false ;;
	# Disable the linker pre-process (undocumented and unused; only here as an escape value)
	--nobazel_run_linker) RUN_LINKER=false ;;
	# Let users pass through arguments to node itself
	--node_options=*) USER_NODE_OPTIONS+=( "${ARG#--node_options=}" ) ;;
	# Remaining argv is collected to pass to the program
	*) ARGS+=( "$ARG" )
	esac
	done

	# Link the first-party modules into node_modules directory before running the actual program
	if [ "$RUN_LINKER" = true ]; then
	link_modules_script=$(rlocation "TEMPLATED_link_modules_script")
	# For programs which are called with bazel run or bazel test, there will be no additional runtime
	# dependencies to link, so we use the default modules_manifest which has only the static dependencies
	# of the binary itself.
	MODULES_MANIFEST=${MODULES_MANIFEST:-$(rlocation "TEMPLATED_modules_manifest")}
	"${node}" "${link_modules_script}" "${MODULES_MANIFEST:-}"
	fi

	if [ "$NODE_PATCHES" = true ]; then
	node_patches_script=$(rlocation "TEMPLATED_node_patches_script")
	# Node's --require option assumes that a non-absolute path not starting with `.` is
	# a module, so that you can do --require=source-map-support/register
	# So if the require script is not absolute, we must make it so
	case "${node_patches_script}" in
	# Absolute path on unix
	/* ) ;;
	# Absolute path on Windows, e.g. C:/path/to/thing
	[a-zA-Z]:/* ) ;;
	# Otherwise it needs to be made relative
	* ) node_patches_script="./${node_patches_script}" ;;
	esac
	LAUNCHER_NODE_OPTIONS+=( "--require" "$node_patches_script" )
	fi

	if [ "$PATCH_REQUIRE" = true ]; then
	require_patch_script=${BAZEL_NODE_PATCH_REQUIRE}
	# See comment above
	case "${require_patch_script}" in
	# Absolute path on unix
	/* ) ;;
	# Absolute path on Windows, e.g. C:/path/to/thing
	[a-zA-Z]:/* ) ;;
	# Otherwise it needs to be made relative
	* ) require_patch_script="./${require_patch_script}" ;;
	esac
	LAUNCHER_NODE_OPTIONS+=( "--require" "$require_patch_script" )
	# Change the entry point to be the loader.js script so we run code before node
	MAIN=$(rlocation "TEMPLATED_loader_script")
	else
	# Entry point is the user-supplied script
	MAIN=TEMPLATED_entry_point_execroot_path
	# TODO: after we link-all-bins we should not need this extra lookup
	if [[ ! -f "$MAIN" ]]; then
	MAIN=TEMPLATED_entry_point_manifest_path
	fi
	fi

	# Tell the node_patches_script that programs should not escape the execroot
	# Bazel always sets the PWD to execroot/my_wksp so we go up one directory.
	export BAZEL_PATCH_ROOT=$(dirname $PWD)

	# Set all bazel managed node_modules directories as guarded so no symlinks may
	# escape and no symlinks may enter
	if [[ "$PWD" == "/bazel-out/" ]]; then
	# We in runfiles, find the execroot.
	# Look for `bazel-out` which is used to determine the the path to `execroot/my_wksp`. This works in
	# all cases including on rbe where the execroot is a path such as `/b/f/w`. For example, when in
	# runfiles on rbe, bazel runs the process in a directory such as
	# `/b/f/w/bazel-out/k8-fastbuild/bin/path/to/pkg/some_test.sh.runfiles/my_wksp`. From here we can
	# determine the execroot `b/f/w` by finding the first instance of bazel-out.
	readonly bazel_out="/bazel-out/"
	readonly rest=${PWD#*$bazel_out}
	readonly index=$(( ${#PWD} - ${#rest} - ${#bazel_out} ))
	if [[ ${index} < 0 ]]; then
	echo "No 'bazel-out' folder found in path '${PWD}'!"
	exit 1
	fi
	readonly execroot=${PWD:0:${index}}
	export BAZEL_PATCH_GUARDS="${execroot}/node_modules"
	else
	# We are in execroot or in some other context all together such as a nodejs_image or a manually
	# run nodejs_binary. If this is execroot then linker node_modules is in the PWD. If this another
	# context then it is safe to assume the node_modules are there and guard that directory if it exists.
	export BAZEL_PATCH_GUARDS="${PWD}/node_modules"
	fi
	if [[ -n "${BAZEL_NODE_MODULES_ROOT:-}" ]]; then
	if [[ "${BAZEL_NODE_MODULES_ROOT}" != "${BAZEL_WORKSPACE}/node_modules" ]]; then
	# If BAZEL_NODE_MODULES_ROOT is set and it is not , add it to the list of bazel patch guards
	# Also, add the external/${BAZEL_NODE_MODULES_ROOT} which is the correct path under execroot
	# and under runfiles it is the legacy external runfiles path
	export BAZEL_PATCH_GUARDS="${BAZEL_PATCH_GUARDS},${BAZEL_PATCH_ROOT}/${BAZEL_NODE_MODULES_ROOT},${PWD}/external/${BAZEL_NODE_MODULES_ROOT}"
	fi
	fi

	# The EXPECTED_EXIT_CODE lets us write bazel tests which assert that
	# a binary fails to run. Otherwise any failure would make such a test
	# fail before we could assert that we expected that failure.
	readonly EXPECTED_EXIT_CODE="TEMPLATED_expected_exit_code"

	if [[ -n "${COVERAGE_DIR:-}" ]]; then
	if [[ -n "${VERBOSE_LOGS:-}" ]]; then
	echo "Turning on node coverage with NODE_V8_COVERAGE=${COVERAGE_DIR}"
	fi
	# Setting NODE_V8_COVERAGE=${COVERAGE_DIR} causes NodeJS to write coverage
	# information our to the COVERAGE_DIR once the process exits
	export NODE_V8_COVERAGE=${COVERAGE_DIR}
	fi

	# Bash does not forward termination signals to any child process when
	# running in docker so need to manually trap and forward the signals
	_term() {
	kill -TERM "${child}" 2>/dev/null
	}

	_int() {
	kill -INT "${child}" 2>/dev/null
	}

	# Execute the main program
	set +e

	if [[ -n "${STDOUT_CAPTURE}" ]] && [[ -n "${STDERR_CAPTURE}" ]]; then
	"${node}" ${LAUNCHER_NODE_OPTIONS[@]+"${LAUNCHER_NODE_OPTIONS[@]}"} ${USER_NODE_OPTIONS[@]+"${USER_NODE_OPTIONS[@]}"} "${MAIN}" ${ARGS[@]+"${ARGS[@]}"} <&0 >$STDOUT_CAPTURE 2>$STDERR_CAPTURE &
	elif [[ -n "${STDOUT_CAPTURE}" ]]; then
	"${node}" ${LAUNCHER_NODE_OPTIONS[@]+"${LAUNCHER_NODE_OPTIONS[@]}"} ${USER_NODE_OPTIONS[@]+"${USER_NODE_OPTIONS[@]}"} "${MAIN}" ${ARGS[@]+"${ARGS[@]}"} <&0 >$STDOUT_CAPTURE &
	elif [[ -n "${STDERR_CAPTURE}" ]]; then
	"${node}" ${LAUNCHER_NODE_OPTIONS[@]+"${LAUNCHER_NODE_OPTIONS[@]}"} ${USER_NODE_OPTIONS[@]+"${USER_NODE_OPTIONS[@]}"} "${MAIN}" ${ARGS[@]+"${ARGS[@]}"} <&0 2>$STDERR_CAPTURE &
	else
	"${node}" ${LAUNCHER_NODE_OPTIONS[@]+"${LAUNCHER_NODE_OPTIONS[@]}"} ${USER_NODE_OPTIONS[@]+"${USER_NODE_OPTIONS[@]}"} "${MAIN}" ${ARGS[@]+"${ARGS[@]}"} <&0 &
	fi

	readonly child=$!
	trap _term SIGTERM
	trap _int SIGINT
	wait "${child}"
	RESULT="$?"
	set -e

	if [[ -n "${EXIT_CODE_CAPTURE}" ]]; then
	echo "${RESULT}" > "${EXIT_CODE_CAPTURE}"
	fi

	if [ "${EXPECTED_EXIT_CODE}" != "0" ]; then
	if [ ${RESULT} != ${EXPECTED_EXIT_CODE} ]; then
	echo "Expected exit code to be ${EXPECTED_EXIT_CODE}, but got ${RESULT}" >&2
	if [ "${RESULT}" -eq "0" ]; then
	# This exit code is handled specially by Bazel:
	# https://github.com/bazelbuild/bazel/blob/486206012a664ecb20bdb196a681efc9a9825049/src/main/java/com/google/devtools/build/lib/util/ExitCode.java#L44
	readonly BAZEL_EXIT_TESTS_FAILED=3;
	exit ${BAZEL_EXIT_TESTS_FAILED}
	fi
	else
	exit 0
	fi
	fi

	# Do not collect coverage for failed tests
	if [ ${RESULT} -ne 0 ]; then
	if [[ -n "${EXIT_CODE_CAPTURE}" ]]; then
	exit 0
	else
	exit ${RESULT}
	fi
	fi

	# Post process the coverage information after the process has exited
	if [[ -n "${COVERAGE_DIR:-}" ]]; then
	if [[ -n "${VERBOSE_LOGS:-}" ]]; then
	echo "Running coverage lcov merger script with arguments"
	echo " --coverage_dir="${COVERAGE_DIR}""
	echo " --output_file="${COVERAGE_OUTPUT_FILE}""
	echo " --source_file_manifest="${COVERAGE_MANIFEST}""
	fi

	set +e
	"${node}" ${LAUNCHER_NODE_OPTIONS[@]+"${LAUNCHER_NODE_OPTIONS[@]}"} "${lcov_merger_script}" --coverage_dir="${COVERAGE_DIR}" --output_file="${COVERAGE_OUTPUT_FILE}" --source_file_manifest="${COVERAGE_MANIFEST}"
	RESULT="$?"
	set -e

	if [[ -n "${EXIT_CODE_CAPTURE}" ]]; then
	echo "${RESULT}" > "${EXIT_CODE_CAPTURE}"
	fi
	fi

	if [[ -n "${EXIT_CODE_CAPTURE}" ]]; then
	exit 0
	else
	exit ${RESULT}
	fi