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CHEF SUGAR

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Chef Sugar? More like crème brûlée. Beautiful Ruby code and exceedingly useful! “

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WHY?

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COOK-494

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COOK-494 "Create a core cookbook with useful primitives for system wrangling"

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COOK-494

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COOK-494

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COOK-494

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COOK-494

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COOK-494

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COOK-494 ✓

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COOK-494 ✓

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COOK-494 ✓

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COOK-494 ✓ ✓

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I LIED

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WELL NOW THIS IS AWKWARD...

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BACK UP

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CHEF SUGAR

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SETH

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SETH VARGO

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SETH VARGO @SETHVARGO

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SETH VARGO FAUXHAI CHEFSPEC BERKSHELF STOVE TEST KITCHEN @SETHVARGO

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SETH VARGO FAUXHAI CHEFSPEC BERKSHELF STOVE TEST KITCHEN #LEARNCHEF @SETHVARGO

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SETH VARGO FAUXHAI CHEFSPEC BERKSHELF STOVE TEST KITCHEN #LEARNCHEF @SETHVARGO (STUFF) ...

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SETH VARGO FAUXHAI CHEFSPEC BERKSHELF STOVE TEST KITCHEN #LEARNCHEF @SETHVARGO RELEASE ENGINEER (STUFF) ...

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SETH VARGO FAUXHAI CHEFSPEC BERKSHELF STOVE TEST KITCHEN #LEARNCHEF @SETHVARGO RELEASE ENGINEER (STUFF) ...

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THIS FUCKING GUARD

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YOU HAVE ALL DONE IT

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execute 'something' do command './configure && make && make install' not_if 'test -x /usr/local/bin/something' end

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execute 'something' do command './configure && make && make install' not_if 'test -x /usr/local/bin/something' end VERSION?

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execute 'something' do command './configure && make && make install' not_if <<-EOH.gsub(/^ {4}/, '') test -x /usr/local/bin/something && /usr/local/bin/something --version | grep 1.0 EOH end VERSION!

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execute 'something' do command './configure && make && make install' not_if <<-EOH.gsub(/^ {4}/, '') test -x#{install_path} && #{install_path} --version | grep #{version} EOH end DYNAMIC

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execute 'something' do command './configure && make && make install' not_if <<-EOH.gsub(/^ {4}/, '') test -x#{node['app']['config']['install_path']} && #{node['app']['config']['install_path']} --version | .. EOH end DYNAMIC

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AND THIS KEPT HAPPENING OVER 'N OVER

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AND IT IS VERY INEFFICIENT TO SHELL OUT

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execute 'something' do command './configure && make && make install' not_if { installed_at_version?('something', '1.0') } end SPOILER

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execute 'something' do command './configure && make && make install' not_if { installed_at_version?('something', '1.0') } end NO VERSION?

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execute 'something' do command './configure && make && make install' not_if { installed?('something') } end NO PROBLEM!

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execute 'something' do command './configure && make && make install' not_if do current = version_for('something').to_f current < 5.0 && current != 4.1 end end COMPLICATED?

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YO DAWG,
 LOOK WHAT I MADE!

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I'M PRETTY SURE THERE'S AN OPEN COOK TICKET...

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I'M PRETTY SURE THERE'S AN OPEN COOK TICKET...

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I'M PRETTY SURE THERE'S AN OPEN COOK TICKET...

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COOK-494

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+

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+ =

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+ = CHEF SUGAR

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LÉ EXÄMPLES

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"CLOUD" templates '/tmp/config' do variables(use_vpc: cloud?) end

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DATA BAGS bag = Chef::EncryptedDataBagItem.load('accounts', 'hipchat') bag = encrypted_data_bag_item('accounts', 'hipchat')

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ATTRIBUTES default['apache2']['config']['root'] = '/var/www' namespace 'apache2' do namespace 'config' do root '/var/www' end end

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CONSTRAINTS Gem::Constraint.new('~> 11.0') .satisfied_by?(Gem::Version.new(Chef::VERSION)) chef_version.satisfies?('~> 11.0')

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GEMS require 'nokogiri' #=> LoadError, ugly stacktrace require_chef_gem 'nokogiri' #=> ! Chef could not load the gem `nokogiri'! You may need to install the gem manually with `gem install nokogiri', or include a recipe before you can use this resource. Please consult the documentation for this cookbook for proper usage.

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DEEP FETCH node['apache2']['config']['root'] #=> '/var/www' node.deep_fetch('apache2', 'config', 'root') #=> '/var/www'

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DEEP FETCH node['apache2']['bad_key']['root'] #=> Undefined method :[] for nil:NilClass node.deep_fetch('apache2', 'bad_key', 'root') #=> nil

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DEEP FETCH node['apache2']['bad_key']['root'] #=> Undefined method :[] for nil:NilClass node.deep_fetch!('apache2', 'bad_key', 'root') #=> No attribute node['apache2']['bad_key']['root'] exists on the current node. Please make sure you have spelled everything correctly.

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PLATFORMS if node['platform'] == 'ubuntu' if ubuntu?

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NAME PLATFORMS if node['platform'] == 'ubuntu' && node['platform_version'].to_f < 12.04 if ubuntu_before_precise?

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NAME PLATFORMS debian_after_squeeze? debian_after_or_at_squeeze? debian_squeeze? debian_before_squeeze? debian_before_or_at_squeeze? debian_after_wheezy? debian_after_or_at_wheezy? debian_wheezy? debian_before_wheezy? debian_before_or_at_wheezy? debian_after_jessie? debian_after_or_at_jessie? debian_jessie? debian_before_jessie? debian_before_or_at_jessie? linuxmint_after_olivia? linuxmint_after_or_at_olivia? linuxmint_olivia? linuxmint_before_olivia? linuxmint_before_or_at_olivia? linuxmint_after_nadia? linuxmint_after_or_at_nadia? linuxmint_nadia? linuxmint_before_nadia? linuxmint_before_or_at_nadia? linuxmint_after_maya? linuxmint_after_or_at_maya? linuxmint_maya? linuxmint_before_maya? linuxmint_before_or_at_maya? linuxmint_after_lisa? linuxmint_after_or_at_lisa? linuxmint_lisa? linuxmint_before_lisa? linuxmint_before_or_at_lisa? mac_os_x_after_lion? mac_os_x_after_or_at_lion? mac_os_x_lion? mac_os_x_before_lion? mac_os_x_before_or_at_lion? mac_os_x_after_mountain_lion? mac_os_x_after_or_at_mountain_lion? mac_os_x_mountain_lion? mac_os_x_before_mountain_lion? mac_os_x_before_or_at_mountain_lion? mac_os_x_after_mavericks? mac_os_x_after_or_at_mavericks? mac_os_x_mavericks? mac_os_x_before_mavericks? mac_os_x_before_or_at_mavericks? ubuntu_after_lucid? ubuntu_after_or_at_lucid? ubuntu_lucid? ubuntu_before_lucid? ubuntu_before_or_at_lucid? ubuntu_after_maverick? ubuntu_after_or_at_maverick? ubuntu_maverick? ubuntu_before_maverick? ubuntu_before_or_at_maverick? ubuntu_after_natty? ubuntu_after_or_at_natty? ubuntu_natty? ubuntu_before_natty? ubuntu_before_or_at_natty? ubuntu_after_oneiric? ubuntu_after_or_at_oneiric? ubuntu_oneiric? ubuntu_before_oneiric? ubuntu_before_or_at_oneiric? ubuntu_after_precise? ubuntu_after_or_at_precise? ubuntu_precise? ubuntu_before_precise? ubuntu_before_or_at_precise? ubuntu_after_quantal? ubuntu_after_or_at_quantal? ubuntu_quantal? ubuntu_before_quantal? ubuntu_before_or_at_quantal? ubuntu_after_raring? ubuntu_after_or_at_raring? ubuntu_raring? ubuntu_before_raring? ubuntu_before_or_at_raring? ubuntu_after_saucy? ubuntu_after_or_at_saucy? ubuntu_saucy? ubuntu_before_saucy? ubuntu_before_or_at_saucy? linux_mint? mint? ubuntu? amazon_linux? amazon? centos? oracle_linux? oracle? scientific_linux? scientific? redhat_enterprise_linux? redhat_enterprise?

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FAMILIES if node['platform_family'] == 'debian' if debian?

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FILTERS package 'apache2' do action :nothing end.run_action(:install) compile_time do package 'apache2' end

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THAT'S BASICALLY ALL OF CHEF SUGAR

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STOP

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STRUCTURE !"" Gemfile !"" Rakefile !"" chef-sugar.gemspec !"" lib # $"" chef # !"" sugar # # !"" ... # $"" sugar.rb !"" metadata.rb !"" recipes # $"" default.rb

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STRUCTURE !"" Gemfile !"" Rakefile !"" chef-sugar.gemspec !"" lib # $"" chef # !"" sugar # # !"" ... # $"" sugar.rb !"" metadata.rb !"" recipes # $"" default.rb

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STRUCTURE !"" Gemfile !"" Rakefile !"" chef-sugar.gemspec !"" lib # $"" chef # !"" sugar # # !"" ... # $"" sugar.rb !"" metadata.rb !"" recipes # $"" default.rb

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STRUCTURE !"" Gemfile !"" Rakefile !"" chef-sugar.gemspec !"" lib # $"" chef # !"" sugar # # !"" ... # $"" sugar.rb !"" metadata.rb !"" recipes # $"" default.rb YES!

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STRUCTURE !"" Gemfile !"" Rakefile !"" chef-sugar.gemspec !"" lib # $"" chef # !"" sugar # # !"" ... # $"" sugar.rb !"" metadata.rb !"" recipes # $"" default.rb YES! ENHANCE!

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STRUCTURE !"" lib # $"" chef # !"" sugar # # !"" architecture.rb # # !"" cloud.rb # # !"" constraints.rb # # !"" core_extensions # # # !"" array.rb # # # $"" string.rb # # !"" core_extensions.rb # # !"" data_bag.rb # # !"" filters.rb # # !"" ip.rb # # !"" kernel.rb

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SUGAR.RB class Chef module Sugar require_relative 'sugar/architecture' # ... end end ! Chef::Recipe.send(:include, Chef::Sugar::DSL) Chef::Resource.send(:include, Chef::Sugar::DSL) Chef::Provider.send(:include, Chef::Sugar::DSL) ! Object.send(:include, Chef::Sugar::Kernel)

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SUGAR.RB class Chef module Sugar require_relative 'sugar/architecture' # ... end end ! Chef::Recipe.send(:include, Chef::Sugar::DSL) Chef::Resource.send(:include, Chef::Sugar::DSL) Chef::Provider.send(:include, Chef::Sugar::DSL) ! Object.send(:include, Chef::Sugar::Kernel)

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SUGAR.RB class Chef module Sugar require_relative 'sugar/architecture' # ... end end ! Chef::Recipe.send(:include, Chef::Sugar::DSL) Chef::Resource.send(:include, Chef::Sugar::DSL) Chef::Provider.send(:include, Chef::Sugar::DSL) ! Object.send(:include, Chef::Sugar::Kernel)

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SUGAR.RB class Chef module Sugar require_relative 'sugar/architecture' # ... end end ! Chef::Recipe.send(:include, Chef::Sugar::DSL) Chef::Resource.send(:include, Chef::Sugar::DSL) Chef::Provider.send(:include, Chef::Sugar::DSL) ! Object.send(:include, Chef::Sugar::Kernel)

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SHELL.RB class Chef module Sugar::Shell extend self ! def which(cmd) # ... magic codez end end ! module DSL def which(cmd); Chef::Sugar::Shell.which(cmd); end end end

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SHELL.RB class Chef module Sugar::Shell extend self ! def which(cmd) # ... magic codez end end ! module DSL def which(cmd); Chef::Sugar::Shell.which(cmd); end end end

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SHELL.RB class Chef module Sugar::Shell extend self ! def which(cmd) # ... magic codez end end ! module DSL def which(cmd); Chef::Sugar::Shell.which(cmd); end end end

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SHELL.RB class Chef module Sugar::Shell extend self ! def which(cmd) # ... magic codez end end ! module DSL def which(cmd); Chef::Sugar::Shell.which(cmd); end end end

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SHELL.RB class Chef module Sugar::Shell extend self ! def which(cmd) # ... magic codez end end ! module DSL def which(cmd); Chef::Sugar::Shell.which(cmd); end end end

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SHELL.RB class Chef module Sugar::Shell extend self ! def which(cmd) # ... magic codez end end ! module DSL def which(cmd); Chef::Sugar::Shell.which(cmd); end end end

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SUGAR.RB class # ... end ! Chef::Recipe.send( Chef::Resource.send( Chef::Provider.send( ! Object.send( ! ! ! ! ! ! ! ! Chef::Resource.send(:include, Chef::Sugar::DSL)

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CORE EXTENSIONS ARE EVIL

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SO I ADDED SOME INSIDE CHEF SUGAR

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BUT THEY ARE NOT REQUIRED

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REQUIRING BY DEFAULT IS AN ANTI-PATTERN

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RECIPE.RB include_recipe 'chef_sugar::default' require 'chef/sugar/core_extensions'

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RECIPE.RB include_recipe 'chef_sugar::default' require 'chef/sugar/core_extensions'

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RECIPE.RB include_recipe 'chef_sugar::default' require 'chef/sugar/core_extensions'

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RECIPE.RB include_recipe 'chef_sugar::default' require 'chef/sugar/core_extensions' ! version('1.2.3').satisfies?('~> 1.2.0')

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RECIPE.RB include_recipe 'chef_sugar::default' require 'chef/sugar/core_extensions' ! version('1.2.3').satisfies?('~> 1.2.0') ! ! ! '1.2.3'.satisfies?('~> 1.2.0')

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THAT'S ALL FOLKS

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SETH VARGO EXTRA RESOURCES @SETHVARGO Info Q: http://www.infoq.com/news/2014/01/chef-sugar Code: https://github.com/sethvargo/chef-sugar Blog: https://sethvargo.com/spice-up-your-recipes-with-chef-sugar/

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SETH VARGO QUESTIONS? @SETHVARGO Info Q: http://www.infoq.com/news/2014/01/chef-sugar Code: https://github.com/sethvargo/chef-sugar Blog: https://sethvargo.com/spice-up-your-recipes-with-chef-sugar/