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90 lines
3.1 KiB
Text
90 lines
3.1 KiB
Text
Subject: [HOWTO] Using post-update hook
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Message-ID: <7vy86o6usx.fsf@assigned-by-dhcp.cox.net>
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From: Junio C Hamano <gitster@pobox.com>
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Date: Fri, 26 Aug 2005 18:19:10 -0700
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Abstract: In this how-to article, JC talks about how he
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uses the post-update hook to automate Git documentation page
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shown at https://www.kernel.org/pub/software/scm/git/docs/.
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Content-type: text/asciidoc
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How to rebuild from update hook
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===============================
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The pages under https://www.kernel.org/pub/software/scm/git/docs/
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are built from Documentation/ directory of the git.git project
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and needed to be kept up-to-date. The www.kernel.org/ servers
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are mirrored and I was told that the origin of the mirror is on
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the machine $some.kernel.org, on which I was given an account
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when I took over Git maintainership from Linus.
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The directories relevant to this how-to are these two:
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/pub/scm/git/git.git/ The public Git repository.
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/pub/software/scm/git/docs/ The HTML documentation page.
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So I made a repository to generate the documentation under my
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home directory over there.
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$ cd
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$ mkdir doc-git && cd doc-git
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$ git clone /pub/scm/git/git.git/ docgen
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What needs to happen is to update the $HOME/doc-git/docgen/
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working tree, build HTML docs there and install the result in
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/pub/software/scm/git/docs/ directory. So I wrote a little
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script:
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$ cat >dododoc.sh <<\EOF
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#!/bin/sh
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cd $HOME/doc-git/docgen || exit
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unset GIT_DIR
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git pull /pub/scm/git/git.git/ master &&
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cd Documentation &&
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make install-webdoc
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EOF
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Initially I used to run this by hand whenever I push into the
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public Git repository. Then I did a cron job that ran twice a
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day. The current round uses the post-update hook mechanism,
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like this:
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$ cat >/pub/scm/git/git.git/hooks/post-update <<\EOF
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#!/bin/sh
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#
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# An example hook script to prepare a packed repository for use over
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# dumb transports.
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#
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# To enable this hook, make this file executable by "chmod +x post-update".
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case " $* " in
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*' refs/heads/master '*)
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echo $HOME/doc-git/dododoc.sh | at now
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;;
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esac
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exec git-update-server-info
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EOF
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$ chmod +x /pub/scm/git/git.git/hooks/post-update
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There are four things worth mentioning:
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- The update-hook is run after the repository accepts a "git
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push", under my user privilege. It is given the full names
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of refs that have been updated as arguments. My post-update
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runs the dododoc.sh script only when the master head is
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updated.
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- When update-hook is run, GIT_DIR is set to '.' by the calling
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receive-pack. This is inherited by the dododoc.sh run via
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the "at" command, and needs to be unset; otherwise, "git
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pull" it does into $HOME/doc-git/docgen/ repository would not
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work correctly.
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- The stdout of update hook script is not connected to git
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push; I run the heavy part of the command inside "at", to
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receive the execution report via e-mail.
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- This is still crude and does not protect against simultaneous
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make invocations stomping on each other. I would need to add
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some locking mechanism for this.
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