technical/platform-support.html

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   8 <title>Platform Support Policy</title>
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 436 <body class="article">
 437 <div id="header">
 438 <h1>Platform Support Policy</h1>
 439 <div class="details">
 440 <span id="revdate">2024-08-23</span>
 441 </div>
 442 </div>
 443 <div id="content">
 444 <div id="preamble">
 445 <div class="sectionbody">
 446 <div class="paragraph">
 447 <p>Git has a history of providing broad "support" for exotic platforms and older
 448 platforms, without an explicit commitment. Stakeholders of these platforms may
 449 want a more predictable support commitment. This is only possible when platform
 450 stakeholders supply Git developers with adequate tooling, so we can test for
 451 compatibility or develop workarounds for platform-specific quirks on our own.
 452 Various levels of platform-specific tooling will allow us to make more solid
 453 commitments around Git&#8217;s compatibility with that platform.</p>
 454 </div>
 455 <div class="paragraph">
 456 <p>Note that this document is about maintaining existing support for a platform
 457 that has generally worked in the past; for adding support to a platform which
 458 doesn&#8217;t generally work with Git, the stakeholders for that platform are expected
 459 to do the bulk of that work themselves. We will consider such patches if they
 460 don&#8217;t make life harder for other supported platforms or for Git contributors.
 461 Some contributors may volunteer to help with the initial or continued support,
 462 but that&#8217;s not a given. Support work which is too intrusive or difficult for the
 463 project to maintain may still not be accepted.</p>
 464 </div>
 465 </div>
 466 </div>
 467 <div class="sect1">
 468 <h2 id="_minimum_requirements">Minimum Requirements</h2>
 469 <div class="sectionbody">
 470 <div class="paragraph">
 471 <p>The rest of this doc describes best practices for platforms to make themselves
 472 easy to support. However, before considering support at all, platforms need to
 473 meet the following minimum requirements:</p>
 474 </div>
 475 <div class="ulist">
 476 <ul>
 477 <li>
 478 <p>Has C99 or C11</p>
 479 </li>
 480 <li>
 481 <p>Uses versions of dependencies which are generally accepted as stable and
 482 supportable, e.g., in line with the version used by other long-term-support
 483 distributions</p>
 484 </li>
 485 <li>
 486 <p>Has active security support (taking security releases of dependencies, etc)</p>
 487 </li>
 488 </ul>
 489 </div>
 490 <div class="paragraph">
 491 <p>These requirements are a starting point, and not sufficient on their own for the
 492 Git community to be enthusiastic about supporting your platform. Maintainers of
 493 platforms which do meet these requirements can follow the steps below to make it
 494 more likely that Git updates will respect the platform&#8217;s needs.</p>
 495 </div>
 496 </div>
 497 </div>
 498 <div class="sect1">
 499 <h2 id="_compatible_by_next_release">Compatible by next release</h2>
 500 <div class="sectionbody">
 501 <div class="paragraph">
 502 <p>To increase probability that compatibility issues introduced in a release
 503 will be fixed in a later release:</p>
 504 </div>
 505 <div class="ulist">
 506 <ul>
 507 <li>
 508 <p>You should send a bug report as soon as you notice the breakage on your
 509 platform. The sooner you notice, the better; watching <code>seen</code> means you can
 510 notice problems before they are considered "done with review"; whereas
 511 watching <code>master</code> means the stable branch could break for your platform, but
 512 you have a decent chance of avoiding a tagged release breaking you. See "The
 513 Policy" in <a href="../howto/maintain-git.txt">"How to maintain Git"</a> for an
 514 overview of which branches are used in the Git project, and how.</p>
 515 </li>
 516 <li>
 517 <p>The bug report should include information about what platform you are using.</p>
 518 </li>
 519 <li>
 520 <p>You should also use <a href="../git-bisect.html">git-bisect(1)</a> and determine which commit
 521 introduced the breakage.</p>
 522 </li>
 523 <li>
 524 <p>Please include any information you have about the nature of the breakage: is
 525 it a memory alignment issue? Is an underlying library missing or broken for
 526 your platform? Is there some quirk about your platform which means typical
 527 practices (like malloc) behave strangely?</p>
 528 </li>
 529 <li>
 530 <p>If possible, build Git from the exact same source both for your platform and
 531 for a mainstream platform, to see if the problem you noticed appears only
 532 on your platform. If the problem appears in both, then it&#8217;s not a
 533 compatibility issue, but we of course appreciate hearing about it in a bug
 534 report anyway, to benefit users of every platform. If it appears only on your
 535 platform, mention clearly that it is a compatibility issue in your report.</p>
 536 </li>
 537 <li>
 538 <p>Once we begin to fix the issue, please work closely with the contributor
 539 working on it to test the proposed fix against your platform.</p>
 540 </li>
 541 </ul>
 542 </div>
 543 <div class="paragraph">
 544 <p>Example: NonStop
 545 <a href="https://lore.kernel.org/git/01bd01da681a$b8d70a70$2a851f50$@nexbridge.com/">reports
 546 problems</a> when they&#8217;re noticed.</p>
 547 </div>
 548 </div>
 549 </div>
 550 <div class="sect1">
 551 <h2 id="_compatible_on_master_and_releases">Compatible on <code>master</code> and releases</h2>
 552 <div class="sectionbody">
 553 <div class="paragraph">
 554 <p>To make sure all stable builds and regular releases work for your platform the
 555 first time, help us avoid breaking <code>master</code> for your platform:</p>
 556 </div>
 557 <div class="ulist">
 558 <ul>
 559 <li>
 560 <p>You should run regular tests against the <code>next</code> branch and
 561 publish breakage reports to the mailing list immediately when they happen.</p>
 562 <div class="ulist">
 563 <ul>
 564 <li>
 565 <p>Ideally, these tests should run daily. They must run more often than
 566 weekly, as topics generally spend at least 7 days in <code>next</code> before graduating
 567 to <code>master</code>, and it takes time to put the brakes on a patch once it lands in
 568 <code>next</code>.</p>
 569 </li>
 570 <li>
 571 <p>You may want to ask to join the <a href="mailto:git-security@googlegroups.com">security
 572 mailing list</a> in order to run tests against the fixes proposed there, too.</p>
 573 </li>
 574 </ul>
 575 </div>
 576 </li>
 577 <li>
 578 <p>It may make sense to automate these; if you do, make sure they are not noisy
 579 (you don&#8217;t need to send a report when everything works, only when something
 580 breaks; you don&#8217;t need to send repeated reports for the same breakage night
 581 after night).</p>
 582 </li>
 583 <li>
 584 <p>Breakage reports should be actionable - include clear error messages that can
 585 help developers who may not have access to test directly on your platform.</p>
 586 </li>
 587 <li>
 588 <p>You should use git-bisect and determine which commit introduced the breakage;
 589 if you can&#8217;t do this with automation, you should do this yourself manually as
 590 soon as you notice a breakage report was sent.</p>
 591 </li>
 592 <li>
 593 <p>You should either:</p>
 594 <div class="ulist">
 595 <ul>
 596 <li>
 597 <p>Provide on-demand access to your platform to a trusted developer working to
 598 fix the issue, so they can test their fix, OR</p>
 599 </li>
 600 <li>
 601 <p>Work closely with the developer fixing the issue; the turnaround to check
 602 that their proposed fix works for your platform should be fast enough that it
 603 doesn&#8217;t hinder the developer working on that fix. Slow testing turnarounds
 604 may cause the fix to miss the next release, or the developer may lose
 605 interest in working on the fix at all.</p>
 606 </li>
 607 </ul>
 608 </div>
 609 </li>
 610 </ul>
 611 </div>
 612 <div class="paragraph">
 613 <p>Example:
 614 <a href="https://lore.kernel.org/git/CAHd-oW6X4cwD_yLNFONPnXXUAFPxgDoccv2SOdpeLrqmHCJB4Q@mail.gmail.com/">AIX</a>
 615 provides a build farm and runs tests against release candidates.</p>
 616 </div>
 617 </div>
 618 </div>
 619 <div class="sect1">
 620 <h2 id="_compatible_on_next">Compatible on <code>next</code></h2>
 621 <div class="sectionbody">
 622 <div class="paragraph">
 623 <p>To avoid reactive debugging and fixing when changes hit a release or stable, you
 624 can aim to ensure <code>next</code> always works for your platform. (See "The Policy" in
 625 <a href="../howto/maintain-git.txt">"How to maintain Git"</a> for an overview of how
 626 <code>next</code> is used in the Git project.) To do that:</p>
 627 </div>
 628 <div class="ulist">
 629 <ul>
 630 <li>
 631 <p>You should add a runner for your platform to the GitHub Actions or GitLab CI
 632 suite.  This suite is run when any Git developer proposes a new patch, and
 633 having a runner for your platform/configuration means every developer will
 634 know if they break you, immediately.</p>
 635 <div class="ulist">
 636 <ul>
 637 <li>
 638 <p>If adding it to an existing CI suite is infeasible (due to architecture
 639 constraints or for performance reasons), any other method which runs as
 640 automatically and quickly as possible works, too. For example, a service
 641 which snoops on the mailing list and automatically runs tests on new [PATCH]
 642 emails, replying to the author with the results, would also be within the
 643 spirit of this requirement.</p>
 644 </li>
 645 </ul>
 646 </div>
 647 </li>
 648 <li>
 649 <p>If you rely on Git avoiding a specific pattern that doesn&#8217;t work well with
 650 your platform (like a certain malloc pattern), raise it on the mailing list.
 651 We&#8217;ll work case-by-case to look for a solution that doesn&#8217;t unnecessarily
 652 constrain other platforms to keep compatibility with yours.</p>
 653 </li>
 654 <li>
 655 <p>If you rely on some configuration or behavior, add a test for it. Untested
 656 behavior is subject to breakage at any time.</p>
 657 <div class="ulist">
 658 <ul>
 659 <li>
 660 <p>Clearly label these tests as necessary for platform compatibility. Add them
 661 to an isolated compatibility-related test suite, like a new t* file or unit
 662 test suite, so that they&#8217;re easy to remove when compatibility is no longer
 663 required.  If the specific compatibility need is gated behind an issue with
 664 another project, link to documentation of that issue (like a bug or email
 665 thread) to make it easier to tell when that compatibility need goes away.</p>
 666 </li>
 667 <li>
 668 <p>Include a comment with an expiration date for these tests no more than 1 year
 669 from now. You can update the expiration date if your platform still needs
 670 that assurance down the road, but we need to know you still care about that
 671 compatibility case and are working to make it unnecessary.</p>
 672 </li>
 673 </ul>
 674 </div>
 675 </li>
 676 </ul>
 677 </div>
 678 <div class="paragraph">
 679 <p>Example: We run our
 680 <a href="https://git.kernel.org/pub/scm/git/git.git/tree/.github/workflows/main.yml">CI
 681 suite</a> on Windows, Ubuntu, Mac, and others.</p>
 682 </div>
 683 </div>
 684 </div>
 685 <div class="sect1">
 686 <h2 id="_getting_help_writing_platform_support_patches">Getting help writing platform support patches</h2>
 687 <div class="sectionbody">
 688 <div class="paragraph">
 689 <p>In general, when sending patches to fix platform support problems, follow
 690 these guidelines to make sure the patch is reviewed with the appropriate level
 691 of urgency:</p>
 692 </div>
 693 <div class="ulist">
 694 <ul>
 695 <li>
 696 <p>Clearly state in the commit message that you are fixing a platform breakage,
 697 and for which platform.</p>
 698 </li>
 699 <li>
 700 <p>Use the CI and test suite to ensure that the fix for your platform doesn&#8217;t
 701 break other platforms.</p>
 702 </li>
 703 <li>
 704 <p>If possible, add a test ensuring this regression doesn&#8217;t happen again. If
 705 it&#8217;s not possible to add a test, explain why in the commit message.</p>
 706 </li>
 707 </ul>
 708 </div>
 709 </div>
 710 </div>
 711 <div class="sect1">
 712 <h2 id="_platform_maintainers">Platform Maintainers</h2>
 713 <div class="sectionbody">
 714 <div class="paragraph">
 715 <p>If you maintain a platform, or Git for that platform, and intend to work with
 716 the Git project to ensure compatibility, please send a patch to add yourself to
 717 this list.</p>
 718 </div>
 719 <div class="paragraph">
 720 <p>NonStop: Randall S. Becker &lt;<a href="mailto:rsbecker@nexbridge.com">rsbecker@nexbridge.com</a>&gt;</p>
 721 </div>
 722 </div>
 723 </div>
 724 </div>
 725 <div id="footer">
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