hjhart

# app/models/user.rb
# username              :string, null: false
# email                 :string, null: false
# password              :string, null: false
# admin                 :boolean, null: false, default: false 

class User < ApplicationRecord
  # Fields
  validates :admin, inclusion: { in: [true, false] }
end

hjhart

update_homebrew_formula:
  description: Pulls in new homebrew formula and caches them
  steps:
    - run:
        name: Set up Cache Key
        command: date '+%Y %m %d' > ~/voom/dependency_checksum

    - restore_cache:
        keys:
          - v3-homebrew-{{ .Branch }}-{{ checksum "~/voom/dependency_checksum" }}

hjhart

precompile_assets:
  description: Precompile Rails Assets
  steps:
    - run:
        name: Set up Cache Key
        command: find ~/voom/app/javascript ~/voom/app/assets -type f -exec md5 -q {} \; > ~/voom/dependency_checksum

    - restore_cache:
        keys:
          - v3-assets-{{ arch }}-{{ .Branch }}-{{ checksum "~/voom/dependency_checksum" }}

hjhart

bundle_install:
  description: Bundle Install
  steps:
    - run:
        name: Expire cache key every month
        command: date '+%Y %m' > ~/voom/dependency_checksum

    - restore_cache:
        keys:
          - v1-bundle-{{ arch }}-{{ checksum "~/voom/dependency_checksum" }}-{{ checksum "~/voom/Gemfile.lock" }}

hjhart

bundle_install:
  description: Bundle Install
  steps:
    - restore_cache:
        keys:
          - bundle-{{ arch }}-{{ checksum "~/voom/Gemfile.lock" }}
          - bundle-{{ arch }}-

    - run:
        name: Install Bundler

hjhart

yarn_install:
  description: Yarn Install
  steps:
    - restore_cache:
        keys:
          - v1-yarn-{{ arch }}-{{ checksum "~/voom/yarn.lock" }}
          - v1-yarn-{{ arch }}-

    - run:
        name: "Yarn Install (Note: Bump cache prefix if this step takes over 30 seconds.)"

hjhart

Effective Caching for Yarn, Bundler, and Rails Asset Pipeline in CircleCI

Phil Karlton said: "There are two hard problems in computer science: cache invalidation, naming things, and off-by-1 errors."

Well, maybe he didn't say exact that, but it's a decent joke anyway.

In this article I'll talk about the first of those problems, caching. And in doing so effectively, how we reduced our CircleCI build times by 33%. For those of you raising your eyebrows and saying "33% off of what?!", I'll direct your eyeballs to the graph below for some absolute numbers.

[ TODO: Show a bar graph of each job going down by a percentage ]

hjhart

git config --global alias.ahead "log origin/master..HEAD --oneline"
for i in *; do echo $i && pushd $i && git ahead 2>/dev/null && popd; done

hjhart

# function happily borrowed from https://unix.stackexchange.com/a/259254
bytesToHuman() {
    b=${1:-0}; d=''; s=0; S=(Bytes {K,M,G,T,E,P,Y,Z}iB)
    while ((b > 1024)); do
        d="$(printf ".%02d" $((b % 1024 * 100 / 1024)))"
        b=$((b / 1024))
        let s++
    done
    echo "$b$d ${S[$s]}"
}

hjhart

failing_specs = new Set(); $('.test-file').each(function() { failing_specs.add(this.innerHTML) }); console.log(Array.from(failing_specs).join(" "))