howto/rebuild-from-update-hook.html

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 440 </head>
 441 <body class="article">
 442 <div id="header">
 443 <h1>How to rebuild from update hook</h1>
 444 <div class="details">
 445 <span id="revdate">2024-09-10</span>
 446 </div>
 447 </div>
 448 <div id="content">
 449 <div class="paragraph">
 450 <p>The pages under <a href="https://www.kernel.org/pub/software/scm/git/docs/" class="bare">https://www.kernel.org/pub/software/scm/git/docs/</a>
 451 are built from Documentation/ directory of the git.git project
 452 and needed to be kept up-to-date.  The www.kernel.org/ servers
 453 are mirrored and I was told that the origin of the mirror is on
 454 the machine $some.kernel.org, on which I was given an account
 455 when I took over Git maintainership from Linus.</p>
 456 </div>
 457 <div class="paragraph">
 458 <p>The directories relevant to this how-to are these two:</p>
 459 </div>
 460 <div class="literalblock">
 461 <div class="content">
 462 <pre>/pub/scm/git/git.git/      The public Git repository.
 463 /pub/software/scm/git/docs/     The HTML documentation page.</pre>
 464 </div>
 465 </div>
 466 <div class="paragraph">
 467 <p>So I made a repository to generate the documentation under my
 468 home directory over there.</p>
 469 </div>
 470 <div class="literalblock">
 471 <div class="content">
 472 <pre>$ cd
 473 $ mkdir doc-git &amp;&amp; cd doc-git
 474 $ git clone /pub/scm/git/git.git/ docgen</pre>
 475 </div>
 476 </div>
 477 <div class="paragraph">
 478 <p>What needs to happen is to update the $HOME/doc-git/docgen/
 479 working tree, build HTML docs there and install the result in
 480 /pub/software/scm/git/docs/ directory.  So I wrote a little
 481 script:</p>
 482 </div>
 483 <div class="literalblock">
 484 <div class="content">
 485 <pre>$ cat &gt;dododoc.sh &lt;&lt;\EOF
 486 #!/bin/sh
 487 cd $HOME/doc-git/docgen || exit</pre>
 488 </div>
 489 </div>
 490 <div class="literalblock">
 491 <div class="content">
 492 <pre>unset GIT_DIR</pre>
 493 </div>
 494 </div>
 495 <div class="literalblock">
 496 <div class="content">
 497 <pre>git pull /pub/scm/git/git.git/ master &amp;&amp;
 498 cd Documentation &amp;&amp;
 499 make install-webdoc
 500 EOF</pre>
 501 </div>
 502 </div>
 503 <div class="paragraph">
 504 <p>Initially I used to run this by hand whenever I push into the
 505 public Git repository.  Then I did a cron job that ran twice a
 506 day.  The current round uses the post-update hook mechanism,
 507 like this:</p>
 508 </div>
 509 <div class="literalblock">
 510 <div class="content">
 511 <pre>$ cat &gt;/pub/scm/git/git.git/hooks/post-update &lt;&lt;\EOF
 512 #!/bin/sh
 513 #
 514 # An example hook script to prepare a packed repository for use over
 515 # dumb transports.
 516 #
 517 # To enable this hook, make this file executable by "chmod +x post-update".</pre>
 518 </div>
 519 </div>
 520 <div class="literalblock">
 521 <div class="content">
 522 <pre>case " $* " in
 523 *' refs/heads/master '*)
 524         echo $HOME/doc-git/dododoc.sh | at now
 525         ;;
 526 esac
 527 exec git-update-server-info
 528 EOF
 529 $ chmod +x /pub/scm/git/git.git/hooks/post-update</pre>
 530 </div>
 531 </div>
 532 <div class="paragraph">
 533 <p>There are four things worth mentioning:</p>
 534 </div>
 535 <div class="ulist">
 536 <ul>
 537 <li>
 538 <p>The update-hook is run after the repository accepts a "git
 539 push", under my user privilege.  It is given the full names
 540 of refs that have been updated as arguments.  My post-update
 541 runs the dododoc.sh script only when the master head is
 542 updated.</p>
 543 </li>
 544 <li>
 545 <p>When update-hook is run, GIT_DIR is set to <em>.</em> by the calling
 546 receive-pack.  This is inherited by the dododoc.sh run via
 547 the "at" command, and needs to be unset; otherwise, "git
 548 pull" it does into $HOME/doc-git/docgen/ repository would not
 549 work correctly.</p>
 550 </li>
 551 <li>
 552 <p>The stdout of update hook script is not connected to git
 553 push; I run the heavy part of the command inside "at", to
 554 receive the execution report via e-mail.</p>
 555 </li>
 556 <li>
 557 <p>This is still crude and does not protect against simultaneous
 558 make invocations stomping on each other.  I would need to add
 559 some locking mechanism for this.</p>
 560 </li>
 561 </ul>
 562 </div>
 563 </div>
 564 <div id="footer">
 565 <div id="footer-text">
 566 Last updated 2024-09-10 13:23:33 -0700
 567 </div>
 568 </div>
 569 </body>
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