Mercurio

Mercurio is a set of components designed to run commands in a host. Also known as the deployment machine. It is designed to be pluggable, so you can run arbitrary commands in the host.

The aim of Mercurio is to transmit a message to the host. The other component required to do this is the Mercurio box.

Mercurio Listener

Python listener on the serial port that translates the slugs passed into commands in the host machine.

Installation

The installation can be done with the source:

python setup.py install

Configuration

The most important value in the configuration is the port where the mercurio box is attached.

This can be determined by running, after the mercurio listener has been installed:

python -m serial.tools.list_ports

The box by default will only send four possible targets:

• Test - Used to run the tests of the application.
• Staging - Used to deploy to the staging environment.
• Production - Used to deploy to the producton environment.

These settings must be expressed in a mercurio.cfg file, located where the listener is run.

e.g.:

[general]
# Use python -m serial.tools.list_ports`` to determine it.
port: /dev/tty.usbserial-A900cfep
[targets]
# Command to be run when this destination is targeted.
test : ls
development: ls
staging: ls
production: fab production deploy

Please note that at the moment the functionality of the host scripts that it can run is limited, at the moment it only runs a single command.

Start the listener

The listener can be run with the following command:

$ mercurio-run.py

It will show some output once the instruction has been received and the command is being executed.

Behind the scenes

The listener expects the target to be passed in the following form:

target=production

After that it determines from the config file what command needs to be run according to the target passed