Using salt from code to extract grains on a minion

[Matt Black]

I want an application on my minion to load some local salt grains when it starts. In the example case I've been working on, this would enable an application to determine the AWS region the server is currently in.

On the minion's command line I can do:

> salt-call grains.item region

local:

    ap-southeast-1

And in code from the master, I can do:

> python                                                                       

>>> import salt

>>> client = salt.client.LocalClient()

>>> client.cmd('sg-app-preprod-01', 'grains.item', ['region'])

{'sg-app-preprod-01': 'ap-southeast-1'}

Any ideas?

[Thomas S Hatch]

import salt.loader

import salt.config

grains = salt.loader.grains(salt.config.minion_config('/etc/salt/minion'))

Basically, this loader function should load up the grains given valid configuration options.

I did not test this, but it should get you on your way, the loader module is where all of the module loader systems are managed, you can load all of the backend types from here, including the execution modules, and then call them directly.

Thomas S. Hatch  |  Founder, CTO

5272 South College Drive, Suite 301 | Murray, UT 84123

tha...@saltstack.com | www.saltstack.com

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[Matt Black]

Awesome, thank you Thomas.

I did look through the code, but I got somewhat lost and thought I'd throw the question out there! The quick reply is much appreciated :)

[Matt Black]

Hey list.

Given that custom grains now live in a separate file at /etc/salt/grains, I think the below is broken. What would be the correct way to load the grains via third-party code now?

Matt

[Matt Black]

It looks to me that the new /etc/salt/grains file is loaded at https://github.com/saltstack/salt/blob/develop/salt/loader.py#L857, and as such I shouldn't have seen any change in behaviour.

Turned out that I wasn't seeing the grains from that file due to file permissions - /etc/salt/minion is 644 and /etc/salt/grains was 600. I'll raise this over on salt-cloud (since that's where the files came from!)