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440ef85dd0
I noticed this convention from the commit logs. It seems like it would be useful to document it, to encourage other committers to link back to code reviews in their commits. Differential Revision: http://llvm-reviews.chandlerc.com/D2678 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201160 91177308-0d34-0410-b5e6-96231b3b80d8
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=============================
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Code Reviews with Phabricator
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=============================
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.. contents::
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:local:
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If you prefer to use a web user interface for code reviews,
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you can now submit your patches for Clang and LLVM at
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`LLVM's Phabricator`_.
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Sign up
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-------
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There are two options to get an account on Phabricator. You can sign up
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immediately with one of the supported OAuth account types if you're comfortable
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with OAuth, but you can also email chandlerc@gmail.com to request an account to
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be created manually without using OAuth. We're working to get support in
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Phabricator to directly create new accounts, but currently this is a manual
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process.
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Note that if you use your Subversion user name as Phabricator user name,
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Phabricator will automatically connect your submits to your Phabricator user in
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the `Code Repository Browser`_.
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Requesting a review via the command line
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----------------------------------------
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Phabricator has a tool called *Arcanist* to upload patches from
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the command line. To get you set up, follow the
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`Arcanist Quick Start`_ instructions.
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You can learn more about how to use arc to interact with
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Phabricator in the `Arcanist User Guide`_.
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Requesting a review via the web interface
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-----------------------------------------
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The tool to create and review patches in Phabricator is called
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*Differential*.
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Note that you can upload patches created through various diff tools,
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including git and svn. To make reviews easier, please always include
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**as much context as possible** with your diff! Don't worry, Phabricator
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will automatically send a diff with a smaller context in the review
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email, but having the full file in the web interface will help the
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reviewer understand your code.
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To get a full diff, use one of the following commands (or just use Arcanist
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to upload your patch):
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* ``git diff -U999999 other-branch``
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* ``svn diff --diff-cmd=diff -x -U999999``
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To upload a new patch:
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* Click *Differential*.
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* Click *Create Diff*.
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* Paste the text diff or upload the patch file.
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Note that TODO
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* Leave the drop down on *Create a new Revision...* and click *Continue*.
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* Enter a descriptive title and summary; add reviewers and mailing
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lists that you want to be included in the review. If your patch is
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for LLVM, cc llvm-commits; if your patch is for Clang, cc cfe-commits.
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* Click *Save*.
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To submit an updated patch:
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* Click *Differential*.
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* Click *Create Diff*.
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* Paste the updated diff.
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* Select the review you want to from the *Attach To* dropdown and click
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*Continue*.
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* Click *Save*.
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Reviewing code with Phabricator
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-------------------------------
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Phabricator allows you to add inline comments as well as overall comments
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to a revision. To add an inline comment, select the lines of code you want
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to comment on by clicking and dragging the line numbers in the diff pane.
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You can add overall comments or submit your comments at the bottom of the page.
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Phabricator has many useful features, for example allowing you to select
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diffs between different versions of the patch as it was reviewed in the
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*Revision Update History*. Most features are self descriptive - explore, and
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if you have a question, drop by on #llvm in IRC to get help.
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Note that as e-mail is the system of reference for code reviews, and some
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people prefer it over a web interface, we do not generate automated mail
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when a review changes state, for example by clicking "Accept Revision" in
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the web interface. Thus, please type LGTM into the comment box to accept
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a change from Phabricator.
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Committing a change
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-------------------
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When committing an LLVM change that has been reviewed using
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Phabricator, the convention is for the commit message to end with the
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line:
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::
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Differential Revision: <URL>
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where ``<URL>`` is the URL for the code review, starting with
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``http://llvm-reviews.chandlerc.com/``.
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Note that Arcanist will add this automatically.
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This allows people reading the version history to see the review for
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context. This also allows Phabricator to detect the commit, close the
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review, and add a link from the review to the commit.
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Status
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------
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Currently, we're testing Phabricator for use with Clang/LLVM. Please let us
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know whether you like it and what could be improved!
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.. _LLVM's Phabricator: http://llvm-reviews.chandlerc.com
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.. _Code Repository Browser: http://llvm-reviews.chandlerc.com/diffusion/
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.. _Arcanist Quick Start: http://www.phabricator.com/docs/phabricator/article/Arcanist_Quick_Start.html
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.. _Arcanist User Guide: http://www.phabricator.com/docs/phabricator/article/Arcanist_User_Guide.html
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