Start pulling pub from its own repo.

sdk/lib/_internal/pub/README.md

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-# Contributing to pub
-
-Thanks for being interested in contributing to pub! Contributing to a new
-project can be hard: there's a lot of new code and practices to learn. This
-document is intended to get you up and running as quickly as possible. If you're
-looking for documentation on using pub, try
-[pub.dartlang.org](http://pub.dartlang.org/doc).
-
-The first step towards contributing is to contact the pub dev team and let us
-know what you're working on, so we can be sure not to start working on the same
-thing at the same time. Just send an email to [misc@dartlang.org] letting us
-know that you're interested in contributing and what you plan on working on.
-This will also let us give you specific advice about where to start.
-
-[misc@dartlang.org]: mailto:misc@dartlang.org
-
-## Organization
-
-Pub isn't a package, but it's organized like one. It has four top-level
-directories:
-
-* `lib/` contains the implementation of pub. Currently, it's all in `lib/src/`,
-  since there are no libraries intended for public consumption.
-
-* `test/` contains the tests for pub.
-
-* `bin/` contains `pub.dart`, the entrypoint script that's run whenever a user
-  types "pub" on the command line or runs it in the Dart editor. This is usually
-  run through shell scripts in `sdk/bin` at the root of the Dart repository.
-
-* `resource/` contains static resource files that pub uses. They're
-  automatically distributed in the Dart SDK.
-
-It's probably easiest to start diving into the codebase by looking at a
-particular pub command. Each command is encapsulated in files in
-`lib/src/command/`.
-
-## Running pub
-
-To run pub from the Dart repository, first [build Dart][building]. From the root
-of the repo:
-
-    ./tools/build.py -m release
-
-You'll need to re-build whenever you sync the repository, but not when you
-modify pub or any packages it depends on. To run pub, just run `sdk/bin/pub` (or
-`sdk/bin/pub.bat` on Windows).
-
-[building]: https://code.google.com/p/dart/wiki/Building
-
-## Testing pub
-
-Before any change is made to pub, all tests should pass. To run all the pub
-tests, run this from the root of the Dart repository:
-
-    ./tools/test.py -m release pub
-
-Changes to pub should be accompanied by one or more tests that exercise the new
-functionality. When adding a test, the best strategy is to find a similar test
-in `test/` and follow the same patterns. Note that pub makes wide use of the
-[scheduled_test] package in its tests, so it's usually important to be familiar
-with that when adding tests.
-
-[scheduled_test]: http://pub.dartlang.org/packages/scheduled_test
-
-Pub tests come in two basic forms. The first, which is usually used to unit test
-classes and libraries internal to pub, has many tests in a single file. This is
-used when each test will take a short time to run. For example,
-`test/version_test.dart` contains unit tests for pub's Version class.
-
-The other form, used by most pub tests, is usually used for integration tests of
-user-visible pub commands. Each test has a file to itself, which is named after
-the test description. This is used when tests can take a long time to run to
-avoid having the tests time out when running on the build bots. For example,
-`tests/get/hosted/get_transitive_test.dart` tests the resolution of transitive
-hosted dependencies when using `pub get`.
-
-When testing new functionality, it's often useful to run a single test rather
-than the entire test suite. You can do this by appending the path to the test
-file to the test command. For example, to run `get/relative_symlink_test.dart`:
-
-    ./tools/test.py -m release pub/get/relative_symlink_test
-
-## Landing your patch
-
-All patches to the Dart repo, including to pub, need to undergo code review
-before they're submitted. The full process for putting up your patch for review
-is [documented elsewhere][contributing].
-
-[contributing]: https://code.google.com/p/dart/wiki/Contributing