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