Contributing to Kallithea

Kallithea is developed and maintained by its users. Please join us and scratch your own itch.

Infrastructure

The main repository is hosted on Our Own Kallithea (aka OOK) at https://kallithea-scm.org/repos/kallithea/, our self-hosted instance of Kallithea.

For now, we use Bitbucket for pull requests and issue tracking. The issue tracker is for tracking bugs, not for support, discussion, or ideas – please use the mailing list or IRC to reach the community.

We use Weblate to translate the user interface messages into languages other than English. Join our project on Hosted Weblate to help us. To register, you can use your Bitbucket or GitHub account. See Translations for more details.

Getting started

To get started with Kallithea development:

hg clone https://kallithea-scm.org/repos/kallithea
cd kallithea
virtualenv ../kallithea-venv
source ../kallithea-venv/bin/activate
pip install --upgrade pip setuptools
pip install --upgrade -e .
pip install --upgrade -r dev_requirements.txt
kallithea-cli config-create my.ini
kallithea-cli db-create -c my.ini --user=user --email=user@example.com --password=password --repos=/tmp
kallithea-cli front-end-build
gearbox serve -c my.ini --reload &
firefox http://127.0.0.1:5000/

If you plan to use Bitbucket for sending contributions, you can also fork Kallithea on Bitbucket first (https://bitbucket.org/conservancy/kallithea) and then replace the clone step above by a clone of your fork. In this case, please see Contribution guidelines below for configuring your fork correctly.

Contribution flow

Starting from an existing Kallithea clone, make sure it is up to date with the latest upstream changes:

hg pull
hg update

Review the Contribution guidelines and Coding guidelines.

If you are new to Mercurial, refer to Mercurial Quick Start and Beginners Guide on the Mercurial wiki.

Now, make some changes and test them (see Running tests). Don’t forget to add new tests to cover new functionality or bug fixes.

For documentation changes, run make html from the docs directory to generate the HTML result, then review them in your browser.

Before submitting any changes, run the cleanup script:

./scripts/run-all-cleanup

When you are completely ready, you can send your changes to the community for review and inclusion. Most commonly used methods are sending patches to the mailing list (via hg email) or by creating a pull request on Bitbucket.

Running tests

After finishing your changes make sure all tests pass cleanly. Run the testsuite by invoking py.test from the project root:

py.test

Note that testing on Python 2.6 also requires unittest2.

Note that on unix systems, the temporary directory (/tmp or where $TMPDIR points) must allow executable files; Git hooks must be executable, and the test suite creates repositories in the temporary directory. Linux systems with /tmp mounted noexec will thus fail.

You can also use tox to run the tests with all supported Python versions (currently Python 2.6–2.7).

When running tests, Kallithea generates a test.ini based on template values in kallithea/tests/conftest.py and populates the SQLite database specified there.

It is possible to avoid recreating the full test database on each invocation of the tests, thus eliminating the initial delay. To achieve this, run the tests as:

gearbox serve -c /tmp/kallithea-test-XXX/test.ini --pid-file=test.pid --daemon
KALLITHEA_WHOOSH_TEST_DISABLE=1 KALLITHEA_NO_TMP_PATH=1 py.test
kill -9 $(cat test.pid)

In these commands, the following variables are used:

KALLITHEA_WHOOSH_TEST_DISABLE=1 - skip whoosh index building and tests
KALLITHEA_NO_TMP_PATH=1 - disable new temp path for tests, used mostly for testing_vcs_operations

You can run individual tests by specifying their path as argument to py.test. py.test also has many more options, see py.test -h. Some useful options are:

-k EXPRESSION         only run tests which match the given substring
                      expression. An expression is a python evaluable
                      expression where all names are substring-matched
                      against test names and their parent classes. Example:
-x, --exitfirst       exit instantly on first error or failed test.
--lf                  rerun only the tests that failed at the last run (or
                      all if none failed)
--ff                  run all tests but run the last failures first. This
                      may re-order tests and thus lead to repeated fixture
                      setup/teardown
--pdb                 start the interactive Python debugger on errors.
-s, --capture=no      don't capture stdout (any stdout output will be
                      printed immediately)

Performance tests

A number of performance tests are present in the test suite, but they are not run in a standard test run. These tests are useful to evaluate the impact of certain code changes with respect to performance.

To run these tests:

env TEST_PERFORMANCE=1 py.test kallithea/tests/performance

To analyze performance, you could install pytest-profiling, which enables the –profile and –profile-svg options to py.test.

Contribution guidelines

Kallithea is GPLv3 and we assume all contributions are made by the committer/contributor and under GPLv3 unless explicitly stated. We do care a lot about preservation of copyright and license information for existing code that is brought into the project.

Contributions will be accepted in most formats – such as pull requests on Bitbucket, something hosted on your own Kallithea instance, or patches sent by email to the kallithea-general mailing list.

When contributing via Bitbucket, please make your fork of https://bitbucket.org/conservancy/kallithea/ non-publishing – it is one of the settings on “Repository details” page. This ensures your commits are in “draft” phase and makes it easier for you to address feedback and for project maintainers to integrate your changes.

Make sure to test your changes both manually and with the automatic tests before posting.

We care about quality and review and keeping a clean repository history. We might give feedback that requests polishing contributions until they are “perfect”. We might also rebase and collapse and make minor adjustments to your changes when we apply them.

We try to make sure we have consensus on the direction the project is taking. Everything non-sensitive should be discussed in public – preferably on the mailing list. We aim at having all non-trivial changes reviewed by at least one other core developer before pushing. Obvious non-controversial changes will be handled more casually.

There is a main development branch (“default”) which is generally stable so that it can be (and is) used in production. There is also a “stable” branch that is almost exclusively reserved for bug fixes or trivial changes. Experimental changes should live elsewhere (for example in a pull request) until they are ready.

Coding guidelines

We don’t have a formal coding/formatting standard. We are currently using a mix of Mercurial’s (https://www.mercurial-scm.org/wiki/CodingStyle), pep8, and consistency with existing code. Run scripts/run-all-cleanup before committing to ensure some basic code formatting consistency.

We support both Python 2.6.x and 2.7.x and nothing else. For now we don’t care about Python 3 compatibility.

We try to support the most common modern web browsers. IE9 is still supported to the extent it is feasible, IE8 is not.

We primarily support Linux and OS X on the server side but Windows should also work.

HTML templates should use 2 spaces for indentation … but be pragmatic. We should use templates cleverly and avoid duplication. We should use reasonable semantic markup with element classes and IDs that can be used for styling and testing. We should only use inline styles in places where it really is semantic (such as display: none).

JavaScript must use ; between/after statements. Indentation 4 spaces. Inline multiline functions should be indented two levels – one for the () and one for {}. Variables holding jQuery objects should be named with a leading $.

Commit messages should have a leading short line summarizing the changes. For bug fixes, put (Issue #123) at the end of this line.

Use American English grammar and spelling overall. Use English title case for page titles, button labels, headers, and ‘labels’ for fields in forms.

Template helpers (that is, everything in kallithea.lib.helpers) should only be referenced from templates. If you need to call a helper from the Python code, consider moving the function somewhere else (e.g. to the model).

Notes on the SQLAlchemy session

Each HTTP request runs inside an independent SQLAlchemy session (as well as in an independent database transaction). Session is the session manager and factory. Session() will create a new session on-demand or return the current session for the active thread. Many database operations are methods on such session instances - only Session.remove() should be called directly on the manager.

Database model objects (almost) always belong to a particular SQLAlchemy session, which means that SQLAlchemy will ensure that they’re kept in sync with the database (but also means that they cannot be shared across requests).

Objects can be added to the session using Session().add, but this is rarely needed:

  • When creating a database object by calling the constructor directly, it must explicitly be added to the session.
  • When creating an object using a factory function (like create_repo), the returned object has already (by convention) been added to the session, and should not be added again.
  • When getting an object from the session (via Session().query or any of the utility functions that look up objects in the database), it’s already part of the session, and should not be added again. SQLAlchemy monitors attribute modifications automatically for all objects it knows about and syncs them to the database.

SQLAlchemy also flushes changes to the database automatically; manually calling Session().flush is usually only necessary when the Python code needs the database to assign an “auto-increment” primary key ID to a freshly created model object (before flushing, the ID attribute will be None).

TurboGears2 DebugBar

It is possible to enable the TurboGears2-provided DebugBar, a toolbar overlayed over the Kallithea web interface, allowing you to see:

  • timing information of the current request, including profiling information
  • request data, including GET data, POST data, cookies, headers and environment variables
  • a list of executed database queries, including timing and result values

DebugBar is only activated when debug = true is set in the configuration file. This is important, because the DebugBar toolbar will be visible for all users, and allow them to see information they should not be allowed to see. Like is anyway the case for debug = true, do not use this in production!

To enable DebugBar, install tgext.debugbar and kajiki (typically via pip) and restart Kallithea (in debug mode).

“Roadmap”

We do not have a road map but are waiting for your contributions. Refer to the wiki for some ideas of places we might want to go – contributions in these areas are very welcome.

Thank you for your contribution!