Hide self-referential symlinks behind a flag in pub.

utils/pub/pub.dart

Index: utils/pub/pub.dart
diff --git a/utils/pub/pub.dart b/utils/pub/pub.dart
index b6f196d830f6fdbf269698b85cfc8bd149f0729b..6db58c53619d6dffd6234365c233f14e12b4a355 100644
--- a/utils/pub/pub.dart
+++ b/utils/pub/pub.dart
@@ -52,6 +52,7 @@ ArgParser get pubArgParser {
   parser.addFlag('version', negatable: false,
     help: 'Prints the version of Pub');
   parser.addFlag('trace', help: 'Prints a stack trace when an error occurs');
+  parser.addFlag('self-link', help: 'Temporary flag, do not use.');
   return parser;
 }
 
@@ -74,6 +75,12 @@ main() {
     return;
   }
 
+  // TODO(rnystrom): Get rid of this flag (and make the default be true) when
+  // #4820 is fixed and the Editor can handle recursive symlinks.
+  if (globalOptions['self-link']) {
+    Entrypoint.installSelfLink = true;
+  }
+
   // TODO(nweiz): Have a fallback for this this out automatically once 1145 is
   // fixed.
   var sdkDir = Platform.environment['DART_SDK'];