Environment aware configuration and tools for Fabric.
pip install hemp
What is Hemp
Hemp is wrapper around Fabric
that gives Fabric some environmental awareness and allows for use of configuration
files to set common or per-environment variables to be used in Fabric scripts.
Hemp is considered stable and production ready.
used to perform thousands of production deployments and uncountable amount of automation
tasks across multitude of platforms without any issues so far.
Hemp executable wraps Fabric and performs some subtle alterations to
how Fabric is loaded and executed, namely,
loading default tasks and configuration files before Fabric execution.
The command line interface is not any different than Fabric itself,
so, running your tasks
as usual and replacing fab with hemp should work out of the
Differences from Fabric
By default, Fabric will load fabfile.py from current working
directory or any of the parent directories.
Hemp extends this functionality to include fabfile.py located in
$HOME of the current user.
This allows you to define your custom, shared utilties and tasks in
one file, and use them without specifying the file
location explicitly when using Hemp.
Hemp loads configuration from Hemp configuration files called
hemp.yml. They are loaded, by default, from $HOME
of the current user and current working directory.
If hemp.yml if found both at home directory of the user and
current working directory, both files are loaded and
their contents merged recursively with contents of the hemp.yml
located in current working directory taking precedence.
By default, specifying a stage requires stage config to be loaded
before any other tasks are executed. It can be done
by invoking hemp with one of the predefined stage tasks or a custom
one, passing the name as an argument to on task.
Consider these samples:
hemp development [task]
hemp on:development [task]
will ultimately result in development stage to be used.
Sample environment configuration
web: ['web1.host.com', 'web2.host.com', 'web3.host.com', 'web4.host.com']
Loading the hosts and roledefs
When invoked with one of the stage tasks or on task, Hemp will
load appropriate configs to Fabric’s env dictionary.
For example, loading staging stage will populate env with
env.hosts = ['web0.host.com']
env.roledefs['web'] = ['web0.host.com']
env.roledefs['db'] = ['web0.host.com']
Host and role definition merging
Instead of overwriting, Hemp will merge whatever values there are
already located in env dictionary, both for hosts
and role definitions.
Additional env settings
All root keys of the hemp.yml file will be loaded into Fabric’s
env dictionary. For example, having configuration like
hosts: ['a.com', 'b.com']
will result in env.hosts to be populated with a.com and
Licensed under terms and conditions of Apache 2.0 license.
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Files for Hemp, version 0.1.9