git/Documentation/howto/rebuild-from-update-hook.txt
Jeff King e52a53df38 doc: use https links to avoid http redirect
Many sites these days unconditionally redirect http requests
to their https equivalents. Let's make our links https in
the first place to save the client a redirect.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-04-20 22:05:37 -07:00

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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.