Update PEP 512 (#107)
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pep-0512.txt
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pep-0512.txt
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@ -18,7 +18,8 @@ process from Mercurial [#hg]_ as hosted at
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hg.python.org [#h.p.o]_ to Git [#git]_ on GitHub [#GitHub]_. Meeting
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the minimum goals of this PEP should allow for the development
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process of Python to be as productive as it currently is, and meeting
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its extended goals should improve it.
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its extended goals should improve the development process from its
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status quo.
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Rationale
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@ -37,12 +38,14 @@ the basic steps were:
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Rietveld code review tool [#rietveld]_.
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6. Download the patch to make sure it still applies cleanly.
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7. Run the test suite manually.
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8. Commit the change manually.
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9. If the change was for a bugfix release, merge into the
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in-development branch.
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10. Run the test suite manually again.
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11. Commit the merge.
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12. Push the changes.
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8. Update the `NEWS`, `ACKS`, and "What's New" document as necessary
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9. Pull changes to avoid a merge race.
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10. Commit the change manually.
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11. If the change was for a bugfix release, merge into the
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in-development branch.
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12. Run the test suite manually again.
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13. Commit the merge.
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14. Push the changes.
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This is a very heavy, manual process for core developers. Even in the
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simple case, you could only possibly skip the code review step, as you
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@ -51,11 +54,11 @@ languishing on the issue tracker due to core developers not being
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able to work through the backlog fast enough to keep up with
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submissions. In turn, that led to a side-effect issue of discouraging
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outside contribution due to frustration from lack of attention, which
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is dangerous problem for an open source project as it runs counter to
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having a viable future for the project. Simply accepting patches
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uploaded to bugs.python.org [#b.p.o]_ is potentially simple for an
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external contributor, it is as slow and burdensome as it gets for
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a core developer to work with.
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is dangerous problem for an open source project with no corporate
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backing as it runs counter to having a viable future for the project.
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While allowing patches to be uploaded to bugs.python.org [#b.p.o]_ is
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potentially simple for an external contributor, it is as slow and
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burdensome as it gets for a core developer to work with.
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Hence the decision was made in late 2014 that a move to a new
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development process was needed. A request for PEPs
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@ -78,16 +81,16 @@ development process to GitHub. The key reasons for choosing GitHub
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were [#reasons]_:
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* Maintaining custom infrastructure has been a burden on volunteers
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(e.g., a custom fork of Rietveld [#rietveld]_
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that is not being maintained is currently being used).
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(e.g., an unmaintained, custom fork of Rietveld [#rietveld]_
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is currently being used).
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* The custom workflow is very time-consuming for core developers
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(not enough automated tooling built to help support it).
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* The custom workflow is a hindrance to external contributors
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(acts as a barrier of entry due to time required to ramp up on
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development process).
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development process unique to CPython itself).
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* There is no feature differentiating GitLab from GitHub beyond
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GitLab being open source.
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* Familiarity with GitHub is far higher amongst core developers and
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* Familiarity with GitHub is far higher among core developers and
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external contributors than with GitLab.
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* Our BDFL prefers GitHub (who would be the first person to tell
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you that his opinion shouldn't matter, but the person making the
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@ -95,36 +98,37 @@ were [#reasons]_:
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the workflow of his own programming language to encourage his
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continued participation).
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There's even already an unofficial image to use to represent the
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There's even already an unofficial logo to represent the
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migration to GitHub [#pythocat]_.
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The overarching goal of this migration is to improve the development
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process to the extent that a core developer can go from external
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contribution submission through all the steps leading to committing
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said contribution all from within a browser on a tablet with WiFi
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said contribution from within a browser on a tablet with WiFi
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using *some* development process (this does not inherently mean
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GitHub's default workflow). All of this will be done in such a way
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that if an external contributor chooses not to use GitHub then they
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will continue to have that option.
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GitHub's default workflow). The final solution will also allow
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an external contributor to contribute even if they chose not to use
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GitHub (although there is not guarantee in feature parity).
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Repositories to Migrate
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=======================
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While hg.python.org [#h.p.o]_ hosts many repositories, there are only
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five key repositories that should move:
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five key repositories that need to move:
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1. devinabox [#devinabox-repo]_ (done)
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2. benchmarks [#benchmarks-repo]_ (maybe)
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2. benchmarks [#benchmarks-repo]_ (skipped)
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3. peps [#peps-repo]_ (done)
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4. devguide [#devguide-repo]_
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4. devguide [#devguide-repo]_ (done)
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5. cpython [#cpython-repo]_
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The devinabox and benchmarks repositories are code-only.
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The devinabox repository is code-only.
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The peps and devguide repositories involve the generation of webpages.
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And the cpython repository has special requirements for integration
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with bugs.python.org [#b.p.o]_.
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Migration Plan
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==============
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@ -140,10 +144,7 @@ Requirements for Code-Only Repositories
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---------------------------------------
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Completion of the requirements in this section will allow the
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devinabox and benchmarks repositories to move to
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GitHub. While devinabox has a sufficiently descriptive name, the
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benchmarks repository does not; therefore, it will be named
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"python-benchmarks".
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devinabox repository to move to GitHub.
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Create a 'Python core' team
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@ -217,7 +218,7 @@ a negative label will be added to the pull request will be blocked
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using GitHub's status API (e.g., a red label stating, "CLA not signed").
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If a contributor lacks a bugs.python.org account, that will lead to
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the negative label being used as well. Using a label for both
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positive and negative cases provides a fallback notification if the
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positive and negative cases provides a fallback signal if the
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bot happens to fail, preventing potential false-positives or
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false-negatives. It also allows for an easy way to trigger the bot
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again by simply removing a CLA-related label (this is in contrast to
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@ -226,7 +227,7 @@ triggered on code changes).
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As no pre-existing bot exists to meet our needs, it will be hosted on
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Heroku [#heroku]_ and written to target Python 3.5 to act as a
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showcase for asynchronous programming. The code for the bot is hosted
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showcase for asynchronous programming. The code for the bot is hosted
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in the Knights Who Say Ni project [#ni]_.
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@ -249,11 +250,6 @@ devguide [#devguide-repo]_ and peps [#peps-repo]_ repositories need
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their respective processes updated to pull from their new Git
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repositories.
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The devguide repository might also need to be named
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``python-devguide`` to make sure the repository is not ambiguous
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when viewed in isolation from the
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python organization [#github-python-org]_.
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Requirements for the cpython Repository
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---------------------------------------
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@ -273,19 +269,8 @@ decided that a linear history is desired. People preferred having a
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single commit representing a single change instead of having a set of
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unrelated commits lead to a merge commit that represented a single
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change. This means that the convenient "Merge" button in GitHub pull
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requests is undesirable, as it creates a merge commit along with all
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of the contributor's individual commits (this does not affect the
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other repositories where the desire for a linear history doesn't
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exist).
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Luckily, Git [#git]_ does not require GitHub's workflow and so one can
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be chosen which gives us a linear history by using Git's CLI. The
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expectation is that all pull requests will be fast-forwarded and
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rebased before being pushed to the master repository. This should
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give proper attribution to the pull request author in the Git
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history. This does have the consequence of losing some GitHub
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features such as automatic closing of pull requests, link generation,
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etc.
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requests will be set to only do *squash* commits and not merge
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commits.
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A second set of recommended commands will also be written for
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committing a contribution from a patch file uploaded to
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@ -300,6 +285,7 @@ core developers is an open issue:
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Linking pull requests to issues
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'''''''''''''''''''''''''''''''
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Historically, external contributions were attached to an issue on
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bugs.python.org [#b.p.o]_ thanks to the fact that all external
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contributions were uploaded as a file. For changes committed by a
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@ -320,14 +306,12 @@ single fix solves multiple issues, but this is fairly rare and issues
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can be merged into one using the ``Superseder`` field on the issue
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tracker).
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Association between a pull request and an issue will be done based on
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detecting the regular expression``[Ii]ssue #(?P<bpo_id>\d+)``. If
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this is specified in either the title or in the body of a message on
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a pull request then connection will be made on
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bugs.python.org [#b.p.o]_. A label will also be added to the pull
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request to signify that the connection was made successfully. This
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could lead to incorrect associations if the wrong issue or
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referencing another issue was done, but these are rare occasions.
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The association between a pull request and an issue will be done based
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on detecting an issue number. If the issue is specified in either the
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title or in the body of a message on a pull request then connection
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will be made on bugs.python.org [#b.p.o]_. Some visible notification
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-- e.g. label or message -- will be made to the pull request to
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notify that the association was successfully made.
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Notify the issue if a commit is made
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@ -338,8 +322,8 @@ reflect this fact. This should work regardless of whether the commit
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came from a pull request or a direct commit.
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Update linking service for mapping commit IDs to URLs
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'''''''''''''''''''''''''''''''''''''''''''''''''''''
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Update the linking service for mapping commit IDs to URLs
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'''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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Currently you can use https://hg.python.org/lookup/ with a revision
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ID from either the Subversion or Mercurial copies of the
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@ -377,8 +361,8 @@ Optional, Planned Features
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Once the cpython repository [#cpython-repo]_ is migrated, all
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repositories will have been moved to GitHub [#github]_ and the
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development process should be on equal footing as before. But a key
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reason for this migration is to improve the development process,
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development process should be on equal footing as before the move. But
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a key reason for this migration is to improve the development process,
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making it better than it has ever been. This section outlines some
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plans on how to improve things.
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@ -390,19 +374,54 @@ migration -- are tracked on their own wiki page [#tracker-plans]_.
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Handling Misc/NEWS
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''''''''''''''''''
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Traditionally the ``Misc/NEWS`` file [#news-file]_ has been problematic
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for changes which spanned Python releases. Oftentimes there will be
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merge conflicts when committing a change between e.g., 3.5 and 3.6
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only in the ``Misc/NEWS`` file. It's so common, in fact, that the
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example instructions in the devguide explicitly mention how to
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resolve conflicts in the ``Misc/NEWS`` file
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Traditionally the ``Misc/NEWS`` file [#news-file]_ has been
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problematic for changes which spanned Python releases. Oftentimes
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there will be merge conflicts when committing a change between e.g.,
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3.5 and 3.6 only in the ``Misc/NEWS`` file. It's so common, in fact,
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that the example instructions in the devguide explicitly mention how
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to resolve conflicts in the ``Misc/NEWS`` file
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[#devguide-merge-across-branches]_. As part of our tool
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modernization, working with the ``Misc/NEWS`` file will be
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simplified.
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There are currently two competing approaches to solving the
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``Misc/NEWS`` problem which are discussed in an open issue:
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`How to handle the Misc/NEWS file`_.
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The planned approach is to use an individual file per news entry,
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containing the text for the entry. In this scenario each feature
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release would have its own directory for news entries and a separate
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file would be created in that directory that was either named after
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the issue it closed or a timestamp value (which prevents collisions).
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Merges across branches would have no issue as the news entry file
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would still be uniquely named and in the directory of the latest
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version that contained the fix. A script would collect all news entry
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files no matter what directory they reside in and create an
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appropriate news file (the release directory can be ignored as the
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mere fact that the file exists is enough to represent that the entry
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belongs to the release). Classification can either be done by keyword
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in the new entry file itself or by using subdirectories representing
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each news entry classification in each release directory (or
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classification of news entries could be dropped since critical
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information is captured by the "What's New" documents which are
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organized). The benefit of this approach is that it keeps the changes
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with the code that was actually changed. It also ties the message to
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being part of the commit which introduced the change. For a commit
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made through the CLI, a script could be provided to help generate the
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file. In a bot-driven scenario, the merge bot could have a way to
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specify a specific news entry and create the file as part of its
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flattened commit (while most likely also supporting using the first
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line of the commit message if no specific news entry was specified).
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If a web-based workflow is used then a status check could be used to
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verify that a new entry file is in the pull request to act as a
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reminder that the file is missing. Code for this approach has been
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written previously for the Mercurial workflow at
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http://bugs.python.org/issue18967. There is also tools from the
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community like https://pypi.python.org/pypi/towncrier,
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https://github.com/twisted/newsbuilder, and
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http://docs.openstack.org/developer/reno/.
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Discussions at the Sep 2016 Python core-dev sprints led to this
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decision compared to the rejected approaches outlined in the
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`Rejected Ideas` section of this PEP. The separate files approach
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seems to have the right balance of flexibility and potential tooling
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out of the various options while solving the motivating problem.
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Handling Misc/ACKS
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@ -452,13 +471,6 @@ disappear overnight.
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Bot to handle pull request merging
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''''''''''''''''''''''''''''''''''
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As stated in the section entitled
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"`Document steps to commit a pull request`_", the desire is to
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maintain a linear history for cpython. Unfortunately,
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Github's [#github]_ web-based workflow does not support a linear
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history. Because of this, a bot should be written to substitute for
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GitHub's in-browser commit abilities.
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To start, the bot should accept commands to commit a pull request
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against a list of branches. This allows for committing a pull request
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that fixes a bug in multiple versions of Python.
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@ -516,7 +528,10 @@ GitHub [#github]_ and yet still know when something occurs on GitHub
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in terms of review comments on relevant pull requests. Current
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thinking is to post a comment to bugs.python.org to the relevant
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issue when at least one review comment has been made over a certain
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period of time (e.g., 15 or 30 minutes). This keeps the email volume
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period of time (e.g., 15 or 30 minutes, although with GitHub now
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supporting
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`reviews <https://help.github.com/articles/reviewing-changes-in-pull-requests/>`_
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the time aspect may be unnecessary). This keeps the email volume
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down for those that receive both GitHub and bugs.python.org email
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notifications while still making sure that those only following
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bugs.python.org know when there might be a review comment to address.
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@ -541,6 +556,11 @@ such, it would be nice to set up appropriate webhooks to trigger
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rebuilding the appropriate web content when the files they are based
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on change instead of having to wait for, e.g., a cronjob to trigger.
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This can partially be solved if the documentation is a Sphinx project
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as then the site can have an unofficial mirror on
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`Read the Docs <https://readthedocs.org/>`_, e.g.
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http://cpython-devguide.readthedocs.io/.
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Link web content back to files that it is generated from
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''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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@ -608,8 +628,8 @@ filled in properly.
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Status
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======
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Requirements for migrating the devinabox [#devinabox-repo]_ and
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benchmarks [#benchmarks-repo]_ repositories:
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Requirements for migrating the devinabox [#devinabox-repo]_
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repository:
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* Completed
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@ -637,6 +657,7 @@ Repositories whose build steps need updating:
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- peps [#peps-repo]_
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- devguide [#devguide-repo]_
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cpython repo [#cpython-repo]_
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-----------------------------
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@ -647,12 +668,12 @@ Required:
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- `Update the devguide`_ to
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`Document steps to commit a pull request`_
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(https://github.com/python/devguide/milestone/1)
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- `Update linking service for mapping commit IDs to URLs`_
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- `Deprecate sys._mercurial`_
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(http://bugs.python.org/issue27593)
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- `Update the linking service for mapping commit IDs to URLs`_
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- `Update PEP 101`_
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- Email python-checkins for each commit (PR or direct)
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(https://help.github.com/articles/managing-notifications-for-pushes-to-a-repository/)
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- Message #python-dev for each commit (PR or direct)
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(https://github.com/python/cpython/settings/hooks/new?service=irc)
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* In progress
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@ -660,11 +681,14 @@ Required:
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(http://psf.upfronthosting.co.za/roundup/meta/issue589)
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- `Notify the issue if a commit is made`_
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(http://psf.upfronthosting.co.za/roundup/meta/issue590)
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- `Deprecate sys._mercurial`_
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(http://bugs.python.org/issue27593)
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* Completed
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- None
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Optional features:
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* Not started
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@ -736,72 +760,6 @@ history will be kept implicitly, but it will need to make sure to
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keep/add attribution.
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How to handle the Misc/NEWS file
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--------------------------------
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There are three competing approaches to handling files like
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``Misc/NEWS`` [#news-file]_. One is to add a news entry for issues on
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bugs.python.org [#b.p.o]_. This would mean an issue that is marked
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as "resolved" could not be closed until a news entry is added in the
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"news" field in the issue tracker. The benefit of tying the news
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entry to the issue is it makes sure that all changes worthy of a news
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entry have an accompanying issue. It also makes classifying a news
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entry automatic thanks to the Component field of the issue. The
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Versions field of the issue also ties the news entry to which Python
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releases were affected. A script would be written to query
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bugs.python.org for relevant new entries for a release and to produce
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the output needed to be checked into the code repository. This
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approach is agnostic to whether a commit was done by CLI or bot. A
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drawback is that there's a disconnect between the actual commit that
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made the change and the news entry by having them live in separate
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places (in this case, GitHub and bugs.python.org). This would mean
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making a commit would then require remembering to go back to
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bugs.python.org to add the news entry.
|
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|
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A competing approach is to use an individual file per news entry,
|
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containing the text for the entry. In this scenario each feature
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release would have its own directory for news entries and a separate
|
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file would be created in that directory that was either named after
|
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the issue it closed or a timestamp value (which prevents collisions).
|
||||
Merges across branches would have no issue as the news entry file
|
||||
would still be uniquely named and in the directory of the latest
|
||||
version that contained the fix. A script would collect all news entry
|
||||
files no matter what directory they reside in and create an
|
||||
appropriate news file (the release directory can be ignored as the
|
||||
mere fact that the file exists is enough to represent that the entry
|
||||
belongs to the release). Classification can either be done by keyword
|
||||
in the new entry file itself or by using subdirectories representing
|
||||
each news entry classification in each release directory (or
|
||||
classification of news entries could be dropped since critical
|
||||
information is captured by the "What's New" documents which are
|
||||
organized). The benefit of this approach is that it keeps the changes
|
||||
with the code that was actually changed. It also ties the message to
|
||||
being part of the commit which introduced the change. For a commit
|
||||
made through the CLI, a script could be provided to help generate the
|
||||
file. In a bot-driven scenario, the merge bot could have a way to
|
||||
specify a specific news entry and create the file as part of its
|
||||
flattened commit (while most likely also supporting using the first
|
||||
line of the commit message if no specific news entry was specified).
|
||||
If a web-based workflow is used then a status check could be used to
|
||||
verify that a new entry file is in the pull request to act as a
|
||||
reminder that the file is missing. Code for this approach has been
|
||||
written previously for the Mercurial workflow at
|
||||
http://bugs.python.org/issue18967. There is also tools from the
|
||||
community like https://pypi.python.org/pypi/towncrier,
|
||||
https://github.com/twisted/newsbuilder, and
|
||||
http://docs.openstack.org/developer/reno/.
|
||||
|
||||
A yet third option is a merge script to handle the conflicts. This
|
||||
approach allows for keeping the NEWS file as a single file. It does
|
||||
run the risk, though, of failure and thus blocking a commit until it
|
||||
can be manually resolved.
|
||||
|
||||
Discussions at the Sep 2016 Python core-dev sprints has led to the
|
||||
decision that the separate files approach will be used. It seems to
|
||||
have the right balance of flexibility and potential tooling out of the
|
||||
three options while solving the motivating problem.
|
||||
|
||||
|
||||
Naming the bots
|
||||
---------------
|
||||
|
||||
|
@ -903,6 +861,29 @@ the first line of a commit message compared to that of a news entry
|
|||
have different requirements in terms of brevity, what should be said,
|
||||
etc.
|
||||
|
||||
|
||||
Deriving ``Misc/NEWS`` from bugs.python.org
|
||||
-------------------------------------------
|
||||
|
||||
A rejected solution to the ``NEWS`` file problem was to specify the
|
||||
entry on bugs.python.org [#b.p.o]_. This would mean an issue that is
|
||||
marked as "resolved" could not be closed until a news entry is added
|
||||
in the "news" field in the issue tracker. The benefit of tying the
|
||||
news entry to the issue is it makes sure that all changes worthy of a
|
||||
news entry have an accompanying issue. It also makes classifying a
|
||||
news entry automatic thanks to the Component field of the issue. The
|
||||
Versions field of the issue also ties the news entry to which Python
|
||||
releases were affected. A script would be written to query
|
||||
bugs.python.org for relevant new entries for a release and to produce
|
||||
the output needed to be checked into the code repository. This
|
||||
approach is agnostic to whether a commit was done by CLI or bot. A
|
||||
drawback is that there's a disconnect between the actual commit that
|
||||
made the change and the news entry by having them live in separate
|
||||
places (in this case, GitHub and bugs.python.org). This would mean
|
||||
making a commit would then require remembering to go back to
|
||||
bugs.python.org to add the news entry.
|
||||
|
||||
|
||||
References
|
||||
==========
|
||||
|
||||
|
|
Loading…
Reference in New Issue