whylom

Here are some quick notes on installing Graphite on a Vagrant virtual machine using Chef recipes from GitHub. This more or less assumes you know what you're doing with Vagrant and Chef.

Notes

• I used the "lucid32" Ubuntu base box you see in most Vagrant examples (http://files.vagrantup.com/lucid32.box)
• Where possible, I used the cookbooks from Opscode. I was forced to use alternatives for Python (did not work for me) and for Graphite (no Opscode cookbook as of now).
• The Graphite recipe depends on the Python, Apache2, and runit recipes.
• I'm running the apt recipe first to update the Ubuntu package manager. The out-of-date manager that ships with the lucid32 box errored out for me when running the Python recipe.

Cookbooks Used

whylom

When using Git, I find myself doing a lot of what I call "exploratory merging" into a throwaway local branch. This is to preview what a scary merge might look like master, or to isolate a bug in a staging environment by selectively merging in certain of the branches that have been deployed.

The names of my throwaway branches always start with an underscore, so I can easily see them when I git branch. Below is a Bash one-liner (aliased as git purge) that deletes unmerged branches whose names start with "_".

[alias]
  purge   = !git branch --no-merged | tr -d "* " | grep ^_ | xargs git branch -D

whylom

Get the first commit of 2012

$ git log --pretty=format:'%H' --after="2011-12-31" | tail -1
d41d8cd98f00b204e9800998ecf8427e

Count the number of commits since then (inclusive)

$ git rev-list d41d8cd98f00b204e9800998ecf8427e^..HEAD | wc -l 
44555

whylom

set(:probability) { |value| condition { rand <= value } }

get '/win_a_car', :probability => 0.1 do
  "You won!"
end

get '/win_a_car' do
  "Sorry, you lost."
end

whylom

This is a Ruby script that enhances the standard git branch listing by organizing and color coding remotes (origin, root, etc).

• Branches whose remote is origin (the default) are listed at the top.
• Branches whose remote is not origin are listed next, with the remote displayed in magenta. This makes it easier to see branches that are shared with other developers.
• A hardcoded list of staging branches are displayed at the bottom in gold.

whylom

if [ -f "$rvm_path/scripts/rvm" ]; then
  source "$rvm_path/scripts/rvm"
  rvm use $(cat .ruby-version)@$(cat .ruby-gemset)
fi

whylom

# add a new "put_copy" method to the Amazon client's S3Object class
# to enable copying an object from 1 bucket to another
# http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectCOPY.html
class AWS::S3::S3Object
  def self.put_copy(source_key, target_key, source_bucket, target_bucket, options = {})
    original = open(url_for(source_key, source_bucket))
    default_options = { :content_type => original.content_type }
    store(target_key, original, target_bucket, default_options.merge(options))
    acl(target_key, target_bucket, acl(source_key, source_bucket))
  end

whylom

# example class
class State < Struct.new(:name, :code)
  def self.all
    [
      State.new('Alabama', 'AL'),
      State.new('Alaska',  'AK'),
      State.new('Arizona', 'AZ')
    ]
  end
end

whylom

Superhash!

A wrapper for Hash that lets you access keys via dynamic methods (like Ruby's OpenStruct) but also:

• works recursively
• also lets you use Hash methods like [] and keys

Example

whylom

### Keybase proof

I hereby claim:

  * I am whylom on github.
  * I am whylom (https://keybase.io/whylom) on keybase.
  * I have a public key whose fingerprint is B2D6 34F6 025A 0830 0169  3C32 80F6 B36C A0C7 7A66

To claim this, I am signing this object: