trac-github 1.2

Features

This Trac plugin performs two functions:

• update the local git mirror used by Trac after each push to GitHub, and notify the new changesets to Trac;

• replace Trac’s built-in browser by GitHub’s (optional).

The notification of new changesets is strictly equivalent to the command described in Trac’s setup guide:

trac-admin TRAC_ENV changeset added …

This feature set is comparable to https://github.com/davglass/github-trac.

However trac-github has the following advantages:

• it can watch only selected branches in each repository;

• it supports multiple repositories;

• it uses GitHub’s generic WebHook URLs;

• it has no external dependencies;

• it is well documented — more docs than code;

• it has an extensive test suite — twice more tests than code;

• it has a much smaller codebase;

• it has better logging;

• it makes better use of Trac’s APIs.

Requirements

trac-github requires Trac >= 0.12 and the git plugin.

This plugin [is included](http://trac.edgewall.org/wiki/TracGit) in Trac >= 1.0 — you only have to enable it in trac.ini. For Trac 0.12 you have to [install it](http://trac-hacks.org/wiki/GitPlugin):

pip install -e git://github.com/hvr/trac-git-plugin.git#egg=TracGit-dev

Then install trac-github itself:

pip install -e git://github.com/aaugustin/trac-github.git#egg=TracGitHub-dev

Setup

_Warning: the commands below are provided for illustrative purposes. You’ll have to adapt them to your setup._

First, you need a mirror of your GitHub repository, writable by the webserver, for Trac’s use:

cd /home/trac git clone –mirror git://github.com/<user>/<project>.git chown -R www-data:www-data <project>.git

Ensure that the user under which your web server runs can update the mirror:

su www-data git –git-dir=/home/trac/<project>.git remote update –prune

Now edit your trac.ini as follows to configure both the git and the trac-github plugins:

[components] trac.versioncontrol.web_ui.browser.BrowserModule = disabled trac.versioncontrol.web_ui.changeset.ChangesetModule = disabled trac.versioncontrol.web_ui.log.LogModule = disabled tracext.github.* = enabled tracopt.versioncontrol.git.* = enabled

[github] repository = <user>/<project>

[trac] repository_dir = /home/trac/<project>.git repository_type = git

In Trac 0.12, use tracext.git.* = enabled instead of tracopt.versioncontrol.git.* = enabled.

Reload the web server and your project should appear in Trac.

Now go to your project’s administration page on GitHub. In the service hooks tab, select WebHook URLs. Enter the URL of your Trac installation followed by github, like this:

http://<trac.example.com>/github

You might want to restrict access to this URL to GitHub’s IPs. They’re listed just under the WebHook URLs setup form. If you do so, be aware that the plugin will appear to fail randomly when GitHub adds a new IP to the list.

Branches

By default, trac-github notifies all the commits to Trac. But you may not wish to trigger notifications for commits on experimental branches until they’re merged, for example.

You can configure trac-github to only notify commits on some branches:

[github] branches = master

You can provide more than one branch name, and you can use [shell-style wildcards](http://docs.python.org/library/fnmatch):

[github] branches = master stable/*

This option also restricts which branches are shown in the timeline.

Besides, trac-github uses an undocumented feature of GitHub’s WebHook to prevent duplicate notifications when you merge branches.

Multiple repositories

If you have multiple repositories, you must tell Trac how they’re called on GitHub:

[github] repository = <user>/<project> # default repository <reponame>.repository = <user>/<project> # for each extra repository <reponame>.branches = <branches> # optional

When you configure the WebHook URLs, append the name used by Trac to identify the repository:

http://<trac.example.com>/github/<reponame>

Advanced use

trac-github provides two components that you can enable separately.

• `tracext.github.GitHubPostCommitHook` is the post-commit hook called by GitHub.

  It updates the git mirror used by Trac, triggers a cache update and notifies components of the new changesets. Notifications are used by Trac’s [commit ticket updater](http://trac.edgewall.org/wiki/CommitTicketUpdater) and [notifications](http://trac.edgewall.org/wiki/TracNotification).

• `tracext.github.GitHubBrowser` replaces Trac’s built-in browser by redirects to the corresponding pages on Github.

  Since it replaces standard URLs of Trac, if you enable this pluign, you must disable three components in trac.versioncontrol.web_ui, as shown in the configuration file above.

Development

In a [virtualenv](http://www.virtualenv.org/), install the requirements:

pip install trac pip install coverage # if you want to run the tests under coverage pip install -e .

or:

pip install trac==0.12.4 pip install -e git://github.com/hvr/trac-git-plugin.git#egg=TracGit-dev

The version of PyGIT bundled with `trac-git-plugin` doesn’t work with the `git` binary shipped with OS X. To fix it, in the virtualenv, edit `src/tracgit/tracext/git/PyGIT.py` and replace `_, _, version = v.strip().split()` with `version = v.strip().split()[2]`.

Run the tests with:

./runtests.py

Display Trac’s log during the tests with:

./runtests.py –with-trac-log

Run the tests under coverage with:

coverage erase ./runtests.py –with-coverage coverage html

If you put a breakpoint in the test suite, you can interact with Trac’s web interface at [http://localhost:8765/](http://localhost:8765/) and with the git repositories through the command line.

Changelog

### 1.2

• Add support for cached repositories.

### 1.1

• Add support for multiple repositories.

• Add an option to restrict notifications to some branches.

• Try to avoid duplicate notifications (GitHub doesn’t document the payload).

• Use GitHub’s generic WebHook URLs.

• Use a git mirror instead of a bare clone.

### 1.0

• Public release.

License

This plugin is released under the BSD license.

It was initially written for [Django’s Trac](https://code.djangoproject.com/).