Asset packaging in Rails integrated with deliver

deliver.rails.build.sh

#!/usr/bin/env bash

set -e

production_tag="production"
current_build="$production_tag"
compiled_assets_commit_message="Compiled assets"

############################################################################## EXEC #

setup_dependencies() {
  [[ $(hostname) =~ "local" ]] || bundle --local
}

get_previous_build() {
  if [[ -z $previous_build ]]
  then
    previous_build="$(git rev-list $production_tag 2> /dev/null | head -1)"

    if [[ -z $previous_build ]]
    then
      force_assets_compilation=true
    fi
  fi
}

run_tests() {
  bundle exec rake
}

all_jenkins_tags() {
  echo $(git tag -l 'jenkins*' | sort -k3 -t- -g -r)
}

tag_for_deploy() {
  get_previous_build && git tag -f "$current_build"
}

force_assets_compilation() {
  force_assets=true
}

if_assets_changed() {
  local _assets_regex='\.(js|css|scss|less|png|jpg)$'
  [[ $(git diff $previous_build..$current_build --name-only | grep -v "public/assets" | grep -cE $_assets_regex) != 0 ]]
}

use_compiled_assets() {
  ( [[ -n $force_assets_compilation ]] || if_assets_changed && compile_assets ) || most_recent_compiled_assets
  tag_for_deploy
}

compile_assets() {
  echo "Assets need compiling..."
  bundle exec rake assets:precompile RAILS_GROUPS=development LOAD_RAILS=1
  git add public/assets
  git commit -m "$compiled_assets_commit_message"
}

most_recent_compiled_assets() {
  echo "Use the most recent compiled assets"
  local _compiled_assets_commit="$(git reflog | grep "$compiled_assets_commit_message" | head -1 | cut -d' ' -f 1)"
  git cherry-pick "$_compiled_assets_commit"
}

_deliver() {
  REFSPEC=$current_build deliver --plain --verbose
}


########################################################################## MANIFEST #

setup_dependencies
run_tests
tag_for_deploy
use_compiled_assets
_deliver