$ SHARD=flutter_plugins SUBSHARD=analyze  dart dev/bots/test.dart
Fetching dependencies...
--packages-for-branch: running on changed packages
Unhandled exception:
ProcessException: fatal: Not a valid object name FETCH_HEAD
  Command: git merge-base FETCH_HEAD HEAD
#0      _throwIfProcessFailed (package:git/src/top_level.dart:39:5)
#1      runGit (package:git/src/top_level.dart:17:5)
<asynchronous suspension>
#2      GitVersionFinder.getBaseSha (package:flutter_plugin_tools/src/common/git_version_finder.dart:77:30)
<asynchronous suspension>
#3      PluginCommand._getAllPackages (package:flutter_plugin_tools/src/common/plugin_command.dart:317:30)
<asynchronous suspension>
#4      Stream.toList.<anonymous closure> (dart:async/stream.dart)
<asynchronous suspension>