Windows: use JNI CreateJunction in Java code

Use the new CreateJunction in the Windows JNI code
every time we need to create junctions. This means
updating WindowsFileOperations and related tests.

Add test for WindowsFileSystem.createSymbolicLink.

See https://github.com/bazelbuild/bazel/issues/2238

--
Change-Id: I5827e2e70e8e147f5f102fabf95fa9a148b3bcdc
Reviewed-on: https://cr.bazel.build/8896
PiperOrigin-RevId: 147598107
MOS_MIGRATED_REVID=147598107

1 files changed, 13 insertions, 0 deletions

diff --git a/src/main/native/windows_processes.cc b/src/main/native/windows_processes.cc
index f016550d48..a014a8cdaa 100644
--- a/src/main/native/windows_processes.cc
+++ b/src/main/native/windows_processes.cc
@@ -625,3 +625,16 @@ Java_com_google_devtools_build_lib_windows_WindowsFileOperations_nativeGetLongPa
                      wcslen(result.get())));
   return JNI_TRUE;
 }
+
+extern "C" JNIEXPORT jboolean JNICALL
+Java_com_google_devtools_build_lib_windows_WindowsFileOperations_nativeCreateJunction(
+    JNIEnv* env, jclass clazz, jstring name, jstring target,
+    jobjectArray error_msg_holder) {
+  std::string error = windows_util::CreateJunction(GetJavaWstring(env, name),
+                                                   GetJavaWstring(env, target));
+  if (!error.empty()) {
+    MaybeReportLastError(error, env, error_msg_holder);
+    return JNI_FALSE;
+  }
+  return JNI_TRUE;
+}