Script finding the build bot group for a given shard.

tools/gardening/bin/shard2group.dart

Index: tools/gardening/bin/shard2group.dart
diff --git a/tools/gardening/bin/shard2group.dart b/tools/gardening/bin/shard2group.dart
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+// Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// Translates a buildbot shard name to the corresponding column group name
+// on the buildbot site, such that it's easier to find the right column.
+//
+// Example: `dart bin/shard2group.dart precomp-linux-debug-x64-be`
+// prints `vm-precomp(5): precomp-linux-debug-x64-be`.
+
+library gardening.shard2group;
+import 'dart:io';
+part 'package:gardening/src/shard_data.dart';
+
+main(List<String> args) async {
+  if (args.length == 0) {
+    print('Usage: dart shard2group.dart <shard-name1> [<shard-name2> ...]');
+    print('Run bin/create_shard_groups.dart to refresh shard data');
+    exit(1);
+  }
+
+  for (String arg in args) {
+    for (String group in shardGroups.keys) {
+      List<String> shardGroup = shardGroups[group];
+      for (int i = 0; i < shardGroup.length; i++) {
+        String shard = shardGroup[i];
+        if (shard.contains(arg)) {
+          print("$group(${i+1}): $shard");
+        }
+      }
+    }
+  }
+}