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Do The Thing

Do The Thing is an easy-to-configure server for handling GitHub webhooks, written in Python using the Flask framework.

Install

Pre-requisites

I have tested it only on Ubuntu 14.04.1 LTS. These requirements refer to this guide. There are other ways to deploy dothething but this is how I do it.

  • Python 3+
  • nginx
  • A GitHub repository

Installation is a little long-winded, and I might come up with a quicker, easier way to install it with time. For now, follow these instructions please.

Step 1: Get the stuff

First, clone this repo:

git@github.com:basicallydan/dothething.git

cd into the directory it's been cloned into, and use virtualenv to create a new virtual environment for dothething. You may put it into this directory using env or venv if you like.

Step 2: Install the Python requirements

# Replace the path for python3 with whatever your python3 path is.
virtualenv --python=/usr/bin/python3

Get your shell into that environment using source venv/bin/activate.

Use pip to install requiremements the requirements:

pip3 install -r requirements.txt

Step 4: Configure your server

Use sample.config.ini to come up with a suitable config file. There are two parts to it:

DEFAULT is used for application settings:
  • WorkingDirectory is where to go to run all of your commands.
  • GlobalPath is the PATH environment variable to send to any commands that you run. Keep in mind to execute binaries or scripts outside of the working directory you still need to use absolute paths, but those binaries or scripts will have access to the PATH you specify in GlobalPath.
  • DeployKeyLocation is the location of an SSH key that you want to use to communicate with GitHub. I use this for a read-only key that can be configured in the "Deploy Keys" section of your repo's Settings.
Branch sections

Next you can create a different config section for each branch that you'd like to handle the webhook requests for. By that I mean, if a commit is pushed to a certain branch, you can have certain commands that will run only for pushes to that branch.

In each section you can specify an array of commands to execute after the latest commit has been checked out.

commands = [
  '/usr/bin/thingie',
  '/usr/bin/anotherthingie --output out.log'
  ]

The spaces before each line are important here so make sure you keep them in line with one another. Each array element is just a string with a command that you might write in bash.

uWSGI Section

The next section specifies options for loading the app into uWSGI.

Step 5: Hook up nginx

Create a new nginx site config file in conf.d or sites-enabled or wherever you put them, and fill it with something like this.

server {
    listen       hooks.yoursite.com:80;
    server_name  hooks.yoursite.com;
    client_max_body_size 10M;

    location / {
      include uwsgi_params;
      uwsgi_pass unix:/src/dothething/dothething.sock;
    }
}

Step 6: Create an upstart script for dothething

Now make a new upstart script in /etc/init called dothething.conf. The contents should be something like this, replacing directories to whatever you've been using thus far:

description "uWSGI server instance configured to serve dothething"

start on runlevel [2345]
stop on runlevel [!2345]

# Put your username here!
setuid dan
setgid www-data

env PATH=/src/dothething/venv/bin
chdir /src/dothething
exec uwsgi --ini config.ini

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