This procedure should work on Windows, Mac, OpenSolaris, and too many flavors of Linux and of BSD to list.
First: In Case Of Trouble¶
In some cases these instructions may fail due to peculiarities of your platform.
If the following instructions don’t Just Work without any further effort on your part, then please write to the tahoe-dev mailing list where friendly hackers will help you out.
You may not need to build Tahoe at all.
If you are on Windows, please see Building Tahoe-LAFS on Windows for platform-specific instructions.
If you are on a Mac, you can either follow these instructions, or use the
pre-packaged bundle described in OS-X Packaging. The Tahoe project hosts
pre-compiled “wheels” for all dependencies, so use the
option described below to avoid needing a compiler.
Many Linux distributions include Tahoe-LAFS packages. Debian and Ubuntu users
apt-get install tahoe-lafs. See OSPackages for other
If you don’t use a pre-packaged copy of Tahoe, you can build it yourself. You’ll need Python2.7, pip, and virtualenv. On unix-like platforms, you will need a C compiler, the Python development headers, and some libraries (libffi-dev and libssl-dev).
On a modern Debian/Ubuntu-derived distribution, this command will get you everything you need:
apt-get install build-essential python-dev libffi-dev libssl-dev python-virtualenv
On OS-X, install pip and virtualenv as described below. If you want to
compile the dependencies yourself (instead of using
--find-links to take
advantage of the pre-compiled ones we host), you’ll also need to install
Xcode and its command-line tools.
Check if you already have an adequate version of Python installed by running
python -V. The latest version of Python v2.7 is recommended, which is
2.7.11 as of this writing. Python v2.6.x and v3 do not work. On Windows, we
recommend the use of native Python v2.7, not Cygwin Python. If you don’t have
one of these versions of Python installed, download and install the latest
version of Python v2.7. Make sure that the path to the installation directory
has no spaces in it (e.g. on Windows, do not install Python in the “Program
% python --version Python 2.7.11
Many Python installations already include
pip, but in case yours does
not, get it with the pip install instructions:
% pip --version pip 8.1.1 from ... (python 2.7)
If you do not have an OS-provided copy of
virtualenv, install it with the
instructions from the virtualenv documentation:
% virtualenv --version 15.0.1
C compiler and libraries¶
Except on OS-X, where the Tahoe project hosts pre-compiled wheels for all dependencies, you will need several C libraries installed before you can build. You will also need the Python development headers, and a C compiler (your python installation should know how to find these).
On Debian/Ubuntu-derived systems, the necessary packages are
libssl-dev, and can be installed with
RPM-based system (like Fedora) these may be named
instead, and cam be installed with
Install the Latest Tahoe-LAFS Release¶
We recommend creating a fresh virtualenv for your Tahoe-LAFS install, to isolate it from any python packages that are already installed (and to isolate the rest of your system from Tahoe’s dependencies).
This example uses a virtualenv named
venv, but you can call it anything
you like. Many people prefer to keep all their virtualenvs in one place, like
It’s usually a good idea to upgrade the virtualenv’s
setuptools to their latest versions, with
venv/bin/pip install -U pip
setuptools. Many operating systems have an older version of
which then includes older versions of pip and setuptools. Upgrading is easy,
and only affects the virtualenv: not the rest of your computer.
Then use the virtualenv’s
pip to install the latest Tahoe-LAFS release
from PyPI with
venv/bin/pip install tahoe-lafs. After installation, run
venv/bin/tahoe --version to confirm the install was successful:
% virtualenv venv New python executable in ~/venv/bin/python2.7 Installing setuptools, pip, wheel...done. % venv/bin/pip install -U pip setuptools Downloading/unpacking pip from https://pypi.python.org/... ... Successfully installed pip setuptools % venv/bin/pip install tahoe-lafs Collecting tahoe-lafs ... Installing collected packages: ... Successfully installed ... % venv/bin/tahoe --version tahoe-lafs: 1.12.1 foolscap: ... %
On OS-X, instead of
pip install tahoe-lafs, use this command to take
advantage of the hosted pre-compiled wheels:
venv/bin/pip install --find-links=https://tahoe-lafs.org/deps tahoe-lafs
Install From a Source Tarball¶
You can also install directly from the source tarball URL:
% virtualenv venv New python executable in ~/venv/bin/python2.7 Installing setuptools, pip, wheel...done. % venv/bin/pip install https://tahoe-lafs.org/downloads/tahoe-lafs-1.12.1.tar.bz2 Collecting https://tahoe-lafs.org/downloads/tahoe-lafs-1.12.1.tar.bz2 ... Installing collected packages: ... Successfully installed ... % venv/bin/tahoe --version tahoe-lafs: 1.12.1 ...
Hacking On Tahoe-LAFS¶
To modify the Tahoe source code, you should get a git checkout, and install
--editable flag. You should also use the
[test] extra to get
the additional libraries needed to run the unit tests:
% git clone https://github.com/tahoe-lafs/tahoe-lafs.git % cd tahoe-lafs % virtualenv venv % venv/bin/pip install --editable .[test] Obtaining file::~/tahoe-lafs ... Successfully installed ... % venv/bin/tahoe --version tahoe-lafs: 1.12.1.post34.dev0 ...
This way, you won’t have to re-run the
pip install step each time you
modify the source code.
The rest of the Tahoe-LAFS documentation assumes that you can run the
tahoe executable that you just created. You have four basic options:
- Use the full path each time (e.g.
- “Activate” the virtualenv with
. venv/bin/activate, to get a subshell with a
$PATHthat includes the
venv/bin/directory, then you can just run
- Change your
$PATHto include the
venv/bin/directory, so you can just run
- Symlink from
~/binis typically in your
$PATH(at least if it exists when you log in), this will let you just run
You might also find the pipsi tool convenient:
tahoe-lafs will create a new virtualenv, install tahoe into it, then
symlink just the executable (into
~/.local/bin/tahoe). Then either add
~/.local/bin/ to your
$PATH, or make one last symlink into
Running the Self-Tests¶
To run the self-tests from a source tree, you’ll need
tox installed. On a
Debian/Ubuntu system, use
apt-get install tox. You can also install it
into your tahoe-specific virtualenv with
pip install tox.
Then just run
tox. This will create a new fresh virtualenv, install Tahoe
(from the source tree, including any changes you have made) and all its
dependencies (including testing-only dependencies) into the virtualenv, then
run the unit tests. This ensures that the tests are repeatable and match the
results of other users, unaffected by any other Python packages installed on
your machine. On a modern computer this will take 5-10 minutes, and should
result in a “all tests passed” mesage:
% tox GLOB sdist-make: ~/tahoe-lafs/setup.py py27 recreate: ~/tahoe-lafs/.tox/py27 py27 inst: ~/tahoe-lafs/.tox/dist/tahoe-lafs-1.12.1.post8.dev0.zip py27 runtests: commands | tahoe --version py27 runtests: commands | trial --rterrors allmydata allmydata.test.test_auth AccountFileCheckerKeyTests test_authenticated ... [OK] test_missing_signature ... [OK] ... Ran 1186 tests in 423.179s PASSED (skips=7, expectedFailures=3, successes=1176) __________________________ summary ___________________________________ py27: commands succeeded congratulations :)
If you see an error like
fatal error: Python.h: No such file or directory
while compiling the dependencies, you need the Python development headers. If
you are on a Debian or Ubuntu system, you can install them with
apt-get install python-dev. On RedHat/Fedora, install
Similar errors about
openssl/crypto.h indicate that you are missing the
OpenSSL development headers (
ffi.h means you