mirror of
https://github.com/RPCS3/llvm-mirror.git
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986805054f
'git push' command, without any other arguments, can do different things depending on the local configuration of Git. This patch updates the 'git push' command with extra arguments to be more resilient to any local configuration. Reviewed By: mehdi_amini Differential Revision: https://reviews.llvm.org/D79964
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.. _phabricator-reviews:
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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, you can now submit
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your patches for Clang and LLVM at `LLVM's Phabricator`_ instance.
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While Phabricator is a useful tool for some, the relevant -commits mailing list
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is the system of record for all LLVM code review. The mailing list should be
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added as a subscriber on all reviews, and Phabricator users should be prepared
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to respond to free-form comments in mail sent to the commits list.
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Sign up
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-------
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To get started with Phabricator, navigate to `https://reviews.llvm.org`_ and
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click the power icon in the top right. You can register with a GitHub account,
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a Google account, or you can create your own profile.
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Make *sure* that the email address registered with Phabricator is subscribed
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to the relevant -commits mailing list. If you are not subscribed to the commit
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list, all mail sent by Phabricator on your behalf will be held for moderation.
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Note that if you use your git 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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.. _phabricator-request-review-web:
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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 git, but using `arc` on the
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command line (see previous section) is prefered: it adds more metadata to
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Phabricator which are useful for the pre-merge testing system and for
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propagating attribution on commits when someone else has to push it for you.
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To make reviews easier, please always include **as much context as
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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 show HEAD -U999999 > mypatch.patch``
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* ``git diff -U999999 @{u} > mypatch.patch``
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* ``git diff HEAD~1 -U999999 > mypatch.patch``
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Before uploading your patch, please make sure it is formatted properly, as
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described in :ref:`How to Submit a Patch <format patches>`.
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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 browse to the patch file. Click *Create Diff*.
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* Leave this first Repository field blank. (We'll fill in the Repository
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later, when sending the review.)
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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. The title and summary are usually
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in the form of a :ref:`commit message <commit messages>`.
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* Add reviewers (see below for advice). (If you set the Repository field
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correctly, llvm-commits or cfe-commits will be subscribed automatically;
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otherwise, you will have to manually subscribe them.)
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* In the Repository field, enter the name of the project (LLVM, Clang,
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etc.) to which the review should be sent.
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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 or browse to the updated patch file. Click *Create 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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* Leave the Repository field blank. (We previously filled out the Repository
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for the review request.)
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* Add comments about the changes in the new diff. Click *Save*.
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Choosing reviewers: You typically pick one or two people as initial reviewers.
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This choice is not crucial, because you are merely suggesting and not requiring
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them to participate. Many people will see the email notification on cfe-commits
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or llvm-commits, and if the subject line suggests the patch is something they
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should look at, they will.
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.. _finding-potential-reviewers:
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Finding potential reviewers
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---------------------------
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Here are a couple of ways to pick the initial reviewer(s):
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* Use ``git blame`` and the commit log to find names of people who have
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recently modified the same area of code that you are modifying.
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* Look in CODE_OWNERS.TXT to see who might be responsible for that area.
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* If you've discussed the change on a dev list, the people who participated
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might be appropriate reviewers.
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Even if you think the code owner is the busiest person in the world, it's still
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okay to put them as a reviewer. Being the code owner means they have accepted
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responsibility for making sure the review happens.
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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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When you have added all your comments, scroll to the bottom of the page and
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click the Submit button.
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You can add overall comments in the text box at the bottom of the page.
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When you're done, click the Submit button.
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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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Once a patch has been reviewed and approved on Phabricator it can then be
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committed to trunk. If you do not have commit access, someone has to
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commit the change for you (with attribution). It is sufficient to add
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a comment to the approved review indicating you cannot commit the patch
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yourself. If you have commit access, there are multiple workflows to commit the
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change. Whichever method you follow it is recommended that your commit message
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ends with the 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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``https://reviews.llvm.org/``.
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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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Note that if you use the Arcanist tool the ``Differential Revision`` line will
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be added automatically. If you don't want to use Arcanist, you can add the
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``Differential Revision`` line (as the last line) to the commit message
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yourself.
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Using the Arcanist tool can simplify the process of committing reviewed code as
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it will retrieve reviewers, the ``Differential Revision``, etc from the review
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and place it in the commit message. You may also commit an accepted change
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directly using ``git push``, per the section in the :ref:`getting started
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guide <commit_from_git>`.
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Note that if you commit the change without using Arcanist and forget to add the
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``Differential Revision`` line to your commit message then it is recommended
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that you close the review manually. In the web UI, under "Leap Into Action" put
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the git revision number in the Comment, set the Action to "Close Revision" and
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click Submit. Note the review must have been Accepted first.
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Committing someone's change from Phabricator
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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On a clean Git repository on an up to date ``master`` branch run the
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following (where ``<Revision>`` is the Phabricator review number):
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::
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arc patch D<Revision>
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This will create a new branch called ``arcpatch-D<Revision>`` based on the
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current ``master`` and will create a commit corresponding to ``D<Revision>`` with a
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commit message derived from information in the Phabricator review.
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Check you are happy with the commit message and amend it if necessary.
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For example, ensure the 'Author' property of the commit is set to the original author.
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You can use a command to correct the author property if it is incorrect:
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::
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git commit --amend --author="John Doe <jdoe@llvm.org>"
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Then, make sure the commit is up-to-date, and commit it. This can be done by running
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the following:
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::
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git pull --rebase https://github.com/llvm/llvm-project.git master
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git show # Ensure the patch looks correct.
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ninja check-$whatever # Rerun the appropriate tests if needed.
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git push https://github.com/llvm/llvm-project.git HEAD:master
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Or
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::
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arc land D<Revision>
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Abandoning a change
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-------------------
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If you decide you should not commit the patch, you should explicitly abandon
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the review so that reviewers don't think it is still open. In the web UI,
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scroll to the bottom of the page where normally you would enter an overall
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comment. In the drop-down Action list, which defaults to "Comment," you should
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select "Abandon Revision" and then enter a comment explaining why. Click the
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Submit button to finish closing the review.
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Status
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------
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Please let us know whether you like it and what could be improved! We're still
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working on setting up a bug tracker, but you can email klimek-at-google-dot-com
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and chandlerc-at-gmail-dot-com and CC the llvm-dev mailing list with questions
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until then. We also could use help implementing improvements. This sadly is
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really painful and hard because the Phabricator codebase is in PHP and not as
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testable as you might like. However, we've put exactly what we're deploying up
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on an `llvm-reviews GitHub project`_ where folks can hack on it and post pull
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requests. We're looking into what the right long-term hosting for this is, but
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note that it is a derivative of an existing open source project, and so not
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trivially a good fit for an official LLVM project.
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.. _LLVM's Phabricator: https://reviews.llvm.org
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.. _`https://reviews.llvm.org`: https://reviews.llvm.org
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.. _Code Repository Browser: https://reviews.llvm.org/diffusion/
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.. _Arcanist Quick Start: https://secure.phabricator.com/book/phabricator/article/arcanist_quick_start/
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.. _Arcanist User Guide: https://secure.phabricator.com/book/phabricator/article/arcanist/
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.. _llvm-reviews GitHub project: https://github.com/r4nt/llvm-reviews/
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