I'm moving all my development environment to Boxen and it's been great, but I have to admit I've had some problems configuring some of my stuff 1.

Here is how I got my emacs config working (after fighting it for over 2 hours!).

Cloning my config

Cloning the repository was probably the easiest part, there are a lot of manifests showing how to do this so I got this working pretty quickly:

$emacs = "${home}/src/emacsdotd"

file { $emacs:
  ensure => directory

repository { $emacs:
  source  => 'nhocki/dotemacs',
  require => File[$emacs]

exec { "pull emacs config":
  command => 'git pull origin master',
  cwd => $emacs

This will create a directory at ~/src/emacsdotd and clone my repo there.

The require => File[$emacs] attribute will let Puppet know that this block can only be excecuted when the $emacs one has finished (makes sure the directory is created before cloning the repo).

Installing Cask

I use Cask to manage my emacs dependencies. The easiest way to install it is homebrew, so to install it within Boxen, I just needed to:

package { 'cask':
  ensure => present

With Cask installed, I needed to make it work with my configuration.

My init.el file looks for the cask.el file at ~/.cask/cask.el (the default location) but since I installed Cask and Homebrew with Boxen it gets was at /opt/boxen/homebrew/opt/cask/ which is kind of a weird place.

So I needed to create a symlink between that folder and ~/.cask. For this I added the following file block:

$homebrew = "${boxen::config::home}/homebrew/opt"

file { "${home}/.cask":
  ensure  => 'link',
  target  => "${homebrew}/cask",
  require => Package['cask']

Notice that I needed the require attribute to point to the package installation so this block will only be executed when the Cask installation is finished.

The ensure => 'link' makes this file block a symlink... Let's talk about this for a second.

Let's be clear, Puppet Symlinks are really fucked up.

If you're going to create a symbolic link between <source_file> and <target_file> 2, you would normally do ln -s <source_file> <target_file>, here's the usage message from ln:

$ ln
usage: ln [-Ffhinsv] source_file [target_file]
       ln [-Ffhinsv] source_file ... target_dir
       link source_file target_file

But for some reason in Puppet the target attribute is the source_file, which honestly WHAT THE FUCK!

We could use the long syntax (where the block's title is not the path) and it is still very confussing:

file { 'create symlink':
  path   => "target_file",
  target => "source_file",
  ensure => 'link'

I don't really know why they named the source_file target when target is the name for the symlink in the actual ln command. This is really confussing and I lost a lot of time on this!

Now that we know how to symlink stuff in Puppet, we can create the link for the emacs configuration:

file { 'create symlink':
  path   => "${home}/.emacs.d",
  target => $emacs,
  ensure => 'link'

This will create the ~/.emacs.d directory and point to the project (~/src/emacsdotd). Emacs will look for the ~/.emacs.d/init.el file by default.

Installing the dependencies

Now that we have a kind-of-working installation and everything is in the right place, we can install all the dependencies in the Cask file.

We need to make sure that the repo has been cloned, and for some reason this command (cask install) sometimes fails (can't find some file - happens randomly AFAIK), so we'll need to be prepared for that:

$emacsIns = "pull emacs config"

exec { 'install emacs dependencies with Cask':
  command => 'cask install',
  cwd => $emacs,
  require => Exec[$emacsIns],
  tries => 3,
  try_sleep => 1

This block will run cask install in our repo directory and try at most 3 times.

It will only run it once the pull action has happened in the repo directory. This is really important because if we run cask install without a Cask file, the command will fail.

It will also install or update automatically the dependencies if they ever change in the Emacs repository, which is awesome.

With all this I got my installation working and now I can run boxen and have everything configured.

Hope this helps

First of all, you can find the whole file here.

I wrote this because I spent over 2 hours trying to figure out how to make this works, hopefully you'll find this and don't go through the same pain I did, specially with the symlinks.

If for any reason you know why Puppet chose to name source as target I would really like to know, so please ping me on Twitter.

  1. Probably because I have no idea how to use Puppet well. 

  2. I did not came up with those names, those are the ones in the ln documentation!