Development with Python

Trying It Out

We can try this command out on our existing staging site—the script should work for

an existing site as well as for a new one. If you like words with Latin roots, you might

describe it as idempotent, which means it does nothing if run twice…

cd deploy_tools

fab deploy

:host=elspeth@superlists-staging.ottg.eu

[superlists-staging.ottg.eu] Executing task 'deploy'

[superlists-staging.ottg.eu] run: mkdir -p /home/elspeth/sites/superlists-stagin

[superlists-staging.ottg.eu] run: cd /home/elspeth/sites/superlists-staging.ottg

[localhost] local: git log -n 1 --format=%H

[superlists-staging.ottg.eu] run: cd /home/elspeth/sites/superlists-staging.ottg

[superlists-staging.ottg.eu] out: HEAD is now at 85a6c87 Add a fabfile for autom

[superlists-staging.ottg.eu] out:

[superlists-staging.ottg.eu] run: sed -i.bak -r -e 's/DEBUG = True/DEBUG = False

[superlists-staging.ottg.eu] run: echo 'ALLOWED_HOSTS = ["superlists-staging.ott

[superlists-staging.ottg.eu] run: echo 'SECRET_KEY = '\\''4p2u8fi6)bltep(6nd_3tt

[superlists-staging.ottg.eu] run: echo 'from .secret_key import SECRET_KEY' >> "

[superlists-staging.ottg.eu] run: /home/elspeth/sites/superlists-staging.ottg.eu

[superlists-staging.ottg.eu] out: Requirement already satisfied (use --upgrade t

[superlists-staging.ottg.eu] out: Cleaning up...

[superlists-staging.ottg.eu] out:

[superlists-staging.ottg.eu] run: cd /home/elspeth/sites/superlists-staging.ottg

[superlists-staging.ottg.eu] out:

[superlists-staging.ottg.eu] out: 0 static files copied, 11 unmodified.

[superlists-staging.ottg.eu] out:

[superlists-staging.ottg.eu] run: cd /home/elspeth/sites/superlists-staging.ottg

[superlists-staging.ottg.eu] out: Creating tables ...

[superlists-staging.ottg.eu] out: Installing custom SQL ...

[superlists-staging.ottg.eu] out: Installing indexes ...

[superlists-staging.ottg.eu] out: Installed 0 object(s) from 0 fixture(s)

[superlists-staging.ottg.eu] out:

Done.

Disconnecting from superlists-staging.ottg.eu... done.

Awesome. I love making computers spew out pages and pages of output like that (in

fact I find it hard to stop myself from making little ’70s computer

<brrp, brrrp, brrrp>

noises like Mother in

Alien

). If we look through it we can see it is doing our bidding:

the

mkdir -p

commands go through happily, even though the directories already exist.

git pull

pulls down the couple of commits we just made. The

sed

and

echo >>

162

Chapter 9: Automating Deployment with Fabric