So you want to hack on Bitmask? Thanks, and welcome!

This document assumes a Linux environment.

There are also ongoing documents with notes for setting up an osx and a windows working environments too, contribution is very much welcome on those docs!

Running tests

Tox is all you need:


Test when changes are made to common/soledad

If you are developing against a non-published branch of leap.common or leap.soledad, run instead:

tox -e py27-dev

This expects leap_common and soledad repos to be checked out in the parent folder.

Setting up the development environment

Install the system-wide dependencies. For debian-based systems:

sudo apt install build-essential python-dev python-virtualenv \
libsqlcipher-dev libssl-dev libffi-dev \
python-pyqt5 python-pyqt5.qtwebkit

If you are going to be running tests that involve creating a lot of OpenPGP keys, and specially in vms, the following is also recommended to speed up things:

sudo apt install haveged

Clone the repo. The master branch has the latest code:

git clone https://0xacab.org/leap/bitmask-dev
cd bitmask-dev

Create a virtualenv and activate it:

virtualenv venv
source venv/bin/activate

By the way, if you plan to get into heavy development, you might want to consider using something like pew, instead of the plain virtualenv.

Now you should be able to install all the bitmask dependencies:

make dev-latest-all

You can also install some dependencies that are going to be useful during development:

pip install -r pkg/requirements-dev.pip

Main Bitmask Components

The Core

The main bitmask-dev repo orchestrates the launching if the bitmaskd daemon. This is a collection of services that launches the vpn and mail services. bitmask vpn, mail and keymanager are the main modules, and soledad is one of the main dependencies for the mail service.

The Qt gui

The Qt gui is a minimalistic wrapper that uses PyQt5 to launch the core and display a qt-webkit browser rendering the resources served by the core. Its main entrypoint is in gui/app.py.

The Javascript UI

A modern javascript app is the main Bitmask Frontend. For instructions on how to develop with the js ui, refer to ui/README.md.

The Thunderbird Extension

The development for the Thunderbird Extension happens on this repo. This extension gets published to the mozilla addons page.

Debugging Bitmask

A must-read for debugging the Bitmask Core daemon is the manhole HowTo.

Bitmask privileged runner

For launching VPN and the firewall, Bitmask needs to run with administrative privileges. In linux, bitmask_root is the component that runs with root privileges. We currently depend on pkexec and polkit to execute it as root. In order to do that, Bitmask needs to put some policykit helper files in a place that is root-writeable.

If you have installed Bitmask from some distro package, these folders should be already in place. If you’re running the Bitmask bundles, the first time you will be prompted to authenticate to allow these helpers to be copied over (or any time that these helpers change).

However, if you’re running bitmask in a headless environment, you will want to copy the helpers manually, without involving pkexec. To do that, use:

sudo `which bitmask_helpers` install

You can also uninstall them:

sudo `which bitmask_helpers` uninstall

How to contribute code

  • Send your merge requests to https://0xacab/leap/bitmask-dev, it will be subject to code-review.
  • Please base your branch for master, and keep it rebased when you push.
  • After review, please squash your commits.

Coding conventions

  • Follow pep8 for all the python code.
  • Git messages should be informative.
  • There is a pre-commit hook ready to be used in the docs/hooks folder, alongside some other hooks to do autopep8 on each commit.

Run `git config commit.template docs/hooks/leap-commit-template` or
edit the .git/config for this project and add
`template = docs/hooks/leap-commit-template` under the [commit] block


[type] <subject>


Type should be one of the following:
- bug (bug fix)
- feat (new feature)
- docs (changes to documentation)
- style (formatting, pep8 violations, etc; no code change)
- refactor (refactoring production code)
- test (adding missing tests, refactoring tests; no production code change)
- pkg (packaging related changes; no production code change)
- i18n translation related changes

Subject should use imperative tone and say what you did.
For example, use 'change', NOT 'changed' or 'changes'.

The body should go into detail about changes made.

The footer should contain any issue references or actions.
You can use one or several of the following:

- Resolves: #XYZ
- Related: #XYZ
- Documentation: #XYZ
- Releases: XYZ

The Documentation field should be included in every new feature commit, and it
should link to an issue in the bug tracker where the new feature is analyzed
and documented.

For a full example of how to write a good commit message, check out


We try hard not to introduce any new dependencies at this moment. If you really have to, the packages bitmask depends on have to be specified both in the setup.py and the pip requirements file.

Don’t introduce any pinning in the setup.py file, they should go in the requirements files (mainly pkg/requirements.pip).

Signing your commits

For contributors with commit access, you should sign all your commits. If you are merging some code from external contributors, you should sign their commits.

For handy alias for sign and signoff commits from external contributors add to your gitconfig:

# Usage: git signoff-rebase [base-commit]
signoff-rebase = "!GIT_SEQUENCE_EDITOR='sed -i -re s/^pick/e/' sh -c 'git rebase -i $1 && while test -f .git/rebase-merge/interactive; do git commit --amend --signoff --no-edit && git rebase --continue; done' -"

Merging code

We avoid merge commits into master, they make a very messy history. Put this in your gitconfig to only allow the merges that can be resolved as a fast-forward:

ff = only

Making a new release

A checklist for the release process can be found here

As part of the release we also tag upload snapshots of the leap.bitmask_js package, in order to allow installation of the javascript application without needing to compile the javascript and html assets. This is done with:

cd ui
make dist-build

and then you can upload it to pypi:

make dist-upload

Contribution ideas

Want to help? Come talk to us on irc or the mailing list!

Some areas in which we always need contribution are:

  • Localization of the client (talk to elijah).
  • Multiplatform gitlab runners
  • Windows and OSX packaging (talk to kali)
  • Windows Firewall integration for VPN
  • Migrating components to py3 (look for vshyba or kali).
  • Minimal C++ Qt client (see kali’s bitmaskqt5 repo)