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Common Vagrant Helpers for User Config, OS Detection, Etc.

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vagrant-helper

Common Vagrant Helpers for User Config, OS Detection, Etc.

What is vagrant-helper?

At DDM, we're starting to use Vagrant a lot. Because it's just Ruby, we've found that we are adding a little bit of programming to our Vagrantfile to make things easier to share among our team. So we've made this repo intended to be a submodule in our vagrant projects.

Installation

Git

In your git project, add this as a submodule:

cd /path/to/vagrant/root/
git submodule add https://github.com/deseretdigital/vagrant-helper.git helper

Other

You can download the latest vagrant-helper, create a directory in your vagrant project called "helper" and then move the unziped files there.

Usage

Setup

At the top of your vagrantfile you can include the helper libraries like so:

require './helper/core'		# Required
require './helper/utils'		# If you want to use the Utils helpers
require './helper/config'	# If you want to use the Config helpers

User Configs

Sometimes it is helpful to allow some customization of a Vagrant project for things like the location of files you would like to mount. Many times a project will require several mounts, and these paths on the host machine can vary from developer to developer.

You can create in your project the config directory and add a prefs.yml file. It can then look something like this:

vm:
  provider: virtualbox
  box:
    name: precise
  network: 10.13.37.10
  forward:
    http: 8080
    ssh:  2222

Then in your Vagrantfile you can load the User Preferences. You can even check to make sure they were loaded.

require './helper/core'		# Required
require './helper/config'	# If you want to use the Config helpers

Vagrant.configure("2") do |config|
    # Load the user preferences in config/prefs.yml
    if (prefs = UserConfig.load(:prefs)).empty?
        abort("Error: no user preferences were loaded, make sure you have created 'config/prefs.yml'")
    end

  	# [ ... continue Vagrantfile settings ... ]

end

Finally, to use a config setting you can just do this:

config.vm.network :hostonly, ip: prefs['vm']['network']

Platform Detection

We have developers on Linux, Mac, and Windows (32 and 64 bit). Sometimes there are certain settings that are more performant than others for a given Provider and OS.

Our Utils helper allows you to detect certain platform settings so you can only apply certain settings to a particular environment.

64bit vs 32bit

You can't have a 64bit guest on a 32bit host, so you can decide which basebox to use like so:

arch = Vagrant::Util::Platform::bit64? ? 64 : 32
config.vm.box = "precise#{arch}"

Is Posix?

If you're on VirtualBox & a Posix based machine (i.e. Mac, Linux) with a large amount of files to share with the guest machine, you likely will run into performance problems. So its recommended to use NFS. However, other providers, or other OSes, do not have this problem so it would be nice not to require them to have NFS on. So here is a way to do it with the Platform utils:

Note, right now there I can't find a programatic way to detect which provider is being used, so it's best to have that in your config file. See above.

provider = prefs['vm']['provider'].to_sym

config.vm.synced_folder(
    '/path/to/host/www', 	# Host
    "/var/www",	 			# Guest

    # NFS on *nix-based platforms to resolve performance issues
    :nfs => (Vagrant::Util::Platform::posix? and provider == :virtualbox)
)

Other Detections

Vagrant::Util::Platform::mac?
Vagrant::Util::Platform::windows?

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