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1. Download and install pycrypto from the previous URL.
2. pip install Fabric.
Another amazing source of precompiled Python packages for Windows is maintained
by
Christoph Gohlke .The usual setup is to have a file called
fabfile.py
, whichwill contain one ormore functions
that can later be invoked from a command-line tool called
fab
, like this:
fab function_name,host=SERVER_ADDRESS
That will invoke the function called
function_name
, passing in a connection to the
server at
SERVER_ADDRESS
. There are many other options for specifying usernames and
passwords, which you can find out about using
fab --help
.
Breakdown of a Fabric Script for Our Deployment
The best way to see how it works is with an example.
Here’s one I made earlier ,auto‐
mating all the deployment steps we’ve been going through. The main function is called
deploy
; that’s the one we’ll invoke from the command line. It uses several helper func‐
tions.
env.host
will contain the server address that we’ve passed in:
deploy_tools/fabfile.py.
from
fabric.contrib.files
import
append
,
exists
,
sed
from
fabric.api
import
env
,
local
,
run
import
random
REPO_URL
=
'https://github.com/hjwp/book-example.git'
#
def
deploy
():
site_folder
=
'/home/
%s
/sites/
%s
'
%
(
env
.
user
,
env
.
host
)
#
source_folder
=
site_folder
+
'/source'
_create_directory_structure_if_necessary
(
site_folder
)
_get_latest_source
(
source_folder
)
_update_settings
(
source_folder
,
env
.
host
)
_update_virtualenv
(
source_folder
)
_update_static_files
(
source_folder
)
_update_database
(
source_folder
)
You’ll want to update the
REPO_URL
variable with the URL of your own Git repo
on its code sharing site.
env.host
will contain the address of the server we’ve specified at the command
line, eg,
superlists.ottg.eu
.
env.user
will contain the username you’re using to log in to the server.
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Chapter 9: Automating Deployment with Fabric