howto/rebuild-from-update-hook.html

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 735 <body class="article">
 736 <div id="header">
 737 <h1>How to rebuild from update hook</h1>
 738 <span id="revdate">2024-03-11</span>
 739 </div>
 740 <div id="content">
 741 <div id="preamble">
 742 <div class="sectionbody">
 743 <div class="paragraph"><p>The pages under <a href="https://www.kernel.org/pub/software/scm/git/docs/">https://www.kernel.org/pub/software/scm/git/docs/</a>
 744 are built from Documentation/ directory of the git.git project
 745 and needed to be kept up-to-date.  The www.kernel.org/ servers
 746 are mirrored and I was told that the origin of the mirror is on
 747 the machine $some.kernel.org, on which I was given an account
 748 when I took over Git maintainership from Linus.</p></div>
 749 <div class="paragraph"><p>The directories relevant to this how-to are these two:</p></div>
 750 <div class="literalblock">
 751 <div class="content">
 752 <pre><code>/pub/scm/git/git.git/       The public Git repository.
 753 /pub/software/scm/git/docs/ The HTML documentation page.</code></pre>
 754 </div></div>
 755 <div class="paragraph"><p>So I made a repository to generate the documentation under my
 756 home directory over there.</p></div>
 757 <div class="literalblock">
 758 <div class="content">
 759 <pre><code>$ cd
 760 $ mkdir doc-git &amp;&amp; cd doc-git
 761 $ git clone /pub/scm/git/git.git/ docgen</code></pre>
 762 </div></div>
 763 <div class="paragraph"><p>What needs to happen is to update the $HOME/doc-git/docgen/
 764 working tree, build HTML docs there and install the result in
 765 /pub/software/scm/git/docs/ directory.  So I wrote a little
 766 script:</p></div>
 767 <div class="literalblock">
 768 <div class="content">
 769 <pre><code>$ cat &gt;dododoc.sh &lt;&lt;\EOF
 770 #!/bin/sh
 771 cd $HOME/doc-git/docgen || exit</code></pre>
 772 </div></div>
 773 <div class="literalblock">
 774 <div class="content">
 775 <pre><code>unset GIT_DIR</code></pre>
 776 </div></div>
 777 <div class="literalblock">
 778 <div class="content">
 779 <pre><code>git pull /pub/scm/git/git.git/ master &amp;&amp;
 780 cd Documentation &amp;&amp;
 781 make install-webdoc
 782 EOF</code></pre>
 783 </div></div>
 784 <div class="paragraph"><p>Initially I used to run this by hand whenever I push into the
 785 public Git repository.  Then I did a cron job that ran twice a
 786 day.  The current round uses the post-update hook mechanism,
 787 like this:</p></div>
 788 <div class="literalblock">
 789 <div class="content">
 790 <pre><code>$ cat &gt;/pub/scm/git/git.git/hooks/post-update &lt;&lt;\EOF
 791 #!/bin/sh
 792 #
 793 # An example hook script to prepare a packed repository for use over
 794 # dumb transports.
 795 #
 796 # To enable this hook, make this file executable by "chmod +x post-update".</code></pre>
 797 </div></div>
 798 <div class="literalblock">
 799 <div class="content">
 800 <pre><code>case " $* " in
 801 *' refs/heads/master '*)
 802         echo $HOME/doc-git/dododoc.sh | at now
 803         ;;
 804 esac
 805 exec git-update-server-info
 806 EOF
 807 $ chmod +x /pub/scm/git/git.git/hooks/post-update</code></pre>
 808 </div></div>
 809 <div class="paragraph"><p>There are four things worth mentioning:</p></div>
 810 <div class="ulist"><ul>
 811 <li>
 812 <p>
 813 The update-hook is run after the repository accepts a "git
 814    push", under my user privilege.  It is given the full names
 815    of refs that have been updated as arguments.  My post-update
 816    runs the dododoc.sh script only when the master head is
 817    updated.
 818 </p>
 819 </li>
 820 <li>
 821 <p>
 822 When update-hook is run, GIT_DIR is set to <em>.</em> by the calling
 823    receive-pack.  This is inherited by the dododoc.sh run via
 824    the "at" command, and needs to be unset; otherwise, "git
 825    pull" it does into $HOME/doc-git/docgen/ repository would not
 826    work correctly.
 827 </p>
 828 </li>
 829 <li>
 830 <p>
 831 The stdout of update hook script is not connected to git
 832    push; I run the heavy part of the command inside "at", to
 833    receive the execution report via e-mail.
 834 </p>
 835 </li>
 836 <li>
 837 <p>
 838 This is still crude and does not protect against simultaneous
 839    make invocations stomping on each other.  I would need to add
 840    some locking mechanism for this.
 841 </p>
 842 </li>
 843 </ul></div>
 844 </div>
 845 </div>
 846 </div>
 847 <div id="footnotes"><hr /></div>
 848 <div id="footer">
 849 <div id="footer-text">
 850 Last updated
 851  2024-03-11 15:40:12 PDT
 852 </div>
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