)]}'
{
  "commit": "f0a40accfbcca85262bbf2eaec8aa36d594540be",
  "tree": "0f6bef88b22436fa048ce2519580c8c3786b19e7",
  "parents": [
    "0a75645f03fcbdb14c6dfa54206d23e02e7edbd6"
  ],
  "author": {
    "name": "gregce",
    "email": "gregce@google.com",
    "time": "Tue Mar 31 14:11:30 2020 -0700"
  },
  "committer": {
    "name": "Copybara-Service",
    "email": "copybara-worker@google.com",
    "time": "Tue Mar 31 14:13:03 2020 -0700"
  },
  "message": "Make StarlarkDefinedConfigTransition immutable.\n\nGenerally speaking, it\u0027s not safe for config transitions to keep state because\na transition instance may be shared across multiple rule instances. Rules should\nnot be able to affect each other through shared transitions.\n\nThis particular case removes an event handler that stores errors (like trying\nto load invalid build settings) which the configuration machinery replays later\nto communicate to the user. The risk trajectory is that a transition that fails\non a badly formed rule might repeat the same error for a well-formed rule\nbecuase of the shared state.\n\nThe most likely user-visible output of this problem is non-deterministic build\nerrors on rules using Starlark build settings and transitions. i.e. repeat the\nsame build twice and get different results.\n\nThis is a huge change (apologies), but conceptually straightforward. We simply\nadd an EventHandler parameter to ConfigurationTransition.apply to provide an\nalternative place to record errors. This lifts StarlarkDefinedConfigTransition\nof the burden to define its own.\n\nMost of the hugeness in this change is that the ConfigurationTransition\ninterface is used in many places, so we have to pass / define this parameter\neverywhere. A less invavise alternative could be to use Java interface defaults,\nbut I think the current approach is a better API (and the pain is limited just\nto this change: there\u0027s no real extra API burden as a result).\n\nTesting note: I\u0027m impressed that this change only broke one test:\nStarlarkRuleTransitionProviderTest#testAliasedBuildSetting, and for\nstraightforward reasons. See new comments in ConfigurationResolver for details.\n\nPiperOrigin-RevId: 304043250\n",
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