fix(runfiles): use normalized paths when guarding runfiles root and n…

…ode_modules on Windows (#3331)

* fix(runfiles): use normalized paths when guarding runfiles root and node_modules on Windows

* refactor(builtin): run new code path only on Windows

internal/node/launcher.sh

@@ -13,6 +13,32 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# It helps to determine if we are running on a Windows environment (excludes WSL as it acts like Unix)
+function isWindows {
+  case "$(uname -s)" in
+      CYGWIN*)    local IS_WINDOWS=1 ;;
+      MINGW*)     local IS_WINDOWS=1 ;;
+      MSYS_NT*)   local IS_WINDOWS=1 ;;
+      *)          local IS_WINDOWS=0 ;;
+  esac
+
+  echo $IS_WINDOWS
+  return
+}
+
+# It helps to normalizes paths when running on Windows.
+#
+# Example:
+# C:/Users/XUser/_bazel_XUser/7q7kkv32/execroot/A/b/C -> /c/users/xuser/_bazel_xuser/7q7kkv32/execroot/a/b/c
+function normalizeWindowsPath {
+  # Apply the followings paths transformations to normalize paths on Windows
+  # -process driver letter
+  # -convert path separator
+  # -lowercase everything
+  echo $(sed -e 's#^\(.\):#/\L\1#' -e 's#\\#/#g' -e 's/[A-Z]/\L&/g' <<< "$1")
+  return
+}
+
 # --- begin runfiles.bash initialization v2 ---
 # Copy-pasted from the Bazel Bash runfiles library v2.
 set -uo pipefail; f=build_bazel_rules_nodejs/third_party/github.com/bazelbuild/bazel/tools/bash/runfiles/runfiles.bash
@@ -49,7 +75,13 @@ source "${RUNFILES_DIR:-/dev/null}/$f" 2>/dev/null || \
 # Case 6a is handled like case 3.
 if [[ -n "${RUNFILES_MANIFEST_ONLY:-}" ]]; then
   # Windows only has a manifest file instead of symlinks.
-  RUNFILES=${RUNFILES_MANIFEST_FILE%/MANIFEST}
+  if [[ $(isWindows) -eq "1" ]]; then
+    # If Windows normalizing the path and case insensitive removing the `/MANIFEST` part of the path
+    NORMALIZED_RUNFILES_MANIFEST_FILE_PATH=$(normalizeWindowsPath $RUNFILES_MANIFEST_FILE)
+    RUNFILES=$(sed 's|\/MANIFEST$||i' <<< $NORMALIZED_RUNFILES_MANIFEST_FILE_PATH)
+  else
+    RUNFILES=${RUNFILES_MANIFEST_FILE%/MANIFEST}
+  fi
 elif [[ -n "${TEST_SRCDIR:-}" ]]; then
   # Case 4, bazel has identified runfiles for us.
   RUNFILES="${TEST_SRCDIR:-}"