Don't traverse through junctions when recursively deleting on Windows.

runtime/bin/directory_win.cc

Index: runtime/bin/directory_win.cc
diff --git a/runtime/bin/directory_win.cc b/runtime/bin/directory_win.cc
index 7fedd6c0bc9c29acd0c76219b1ced13c475c965f..e655751f86ec1d2c73a96464c925056a1d3e5348 100644
--- a/runtime/bin/directory_win.cc
+++ b/runtime/bin/directory_win.cc
@@ -233,6 +233,16 @@ static bool DeleteEntry(LPWIN32_FIND_DATA find_file_data,
 
 
 static bool DeleteRecursively(const char* dir_name) {
+  // If the directory is a junction, it's pointing to some other place in the
+  // filesystem that we do not want to recurse into.
+  DWORD attributes = GetFileAttributes(dir_name);
+  if ((attributes != INVALID_FILE_ATTRIBUTES) &&
+      (attributes & FILE_ATTRIBUTE_REPARSE_POINT) != 0) {
+    printf("%s junction\n", dir_name);

[Søren Gjesse, 2012/08/17 07:07:37]

Please remove debug print.

[Mads Ager (google), 2012/08/17 07:08:46]

Remove debug printing.

[Bob Nystrom, 2012/08/20 23:24:32]

Done.

+    // Just delete the junction itself.
+    return RemoveDirectory(dir_name) != 0;
+  }
+
   // Compute full path for the directory currently being deleted.  The
   // path buffer will be used to construct the current path in the
   // recursive traversal. path_length does not always equal