(GH-2291) Enable bootsnap loadpath caching

!feature

* **Enable bootsnap loadpath caching** ([#2291](#2291))

   Enable bootsnap loadpath caching

bolt.gemspec

@@ -44,6 +44,7 @@ Gem::Specification.new do |spec|
 
   spec.add_dependency "addressable", '~> 2.5'
   spec.add_dependency "aws-sdk-ec2", '~> 1'
+  spec.add_dependency "bootsnap", "~> 1.5"
   spec.add_dependency "CFPropertyList", "~> 2.2"
   spec.add_dependency "concurrent-ruby", "~> 1.0"
   spec.add_dependency "ffi", "< 1.14.0"

documentation/experimental_features.md

@@ -471,3 +471,17 @@ To encrypt SSH connections using the unsupported algorithm
 > option to shell out to SSH. See [the net-ssh
 > README](https://github.com/net-ssh/net-ssh/#supported-algorithms) for a list of supported
 > algorithms.
+
+## Experimental Windows Performance Improvements
+
+We are working to make executing Bolt on Windows much faster using several approaches. One of the ways is to use the `bootsnap` gem to cache the load paths to the gems Bolt uses.
+
+To enable this performance improvement set the BOLT_BOOTSNAP environment variable to true before executing any commands.
+
+```
+PS C:\Users\Administrator> $env:BOLT_BOOTSNAP = 'true'
+PS C:\Users\Administrator> bolt command run 'echo hello' -t localhost
+```
+This can be added to your PowerShell profile while evaluating until this experimental feature is folded into the product.
+
+> Note that the first run of Bolt after enabling caching will take much longer than a normal run. All subsequent runs after will perform faster.

exe/bolt

@@ -1,6 +1,21 @@
 #!/usr/bin/env ruby
 # frozen_string_literal: true
 
+bootsnap_enabled = ENV['BOLT_BOOTSNAP'] || false
+if bootsnap_enabled
+  require 'bootsnap'
+  cache = File.join(ENV['USERPROFILE'], '.puppetlabs', 'etc', 'bolt')
+  Bootsnap.setup(
+    cache_dir:            cache, # Path to your cache
+    development_mode:     false, # Current working environment, e.g. RACK_ENV, RAILS_ENV, etc
+    load_path_cache:      true,  # Optimize the LOAD_PATH with a cache
+    autoload_paths_cache: false, # Optimize ActiveSupport autoloads with cache
+    disable_trace:        false, # Set `RubyVM::InstructionSequence.compile_option = { trace_instruction: false }`
+    compile_cache_iseq:   true,  # Compile Ruby code into ISeq cache, breaks coverage reporting.
+    compile_cache_yaml:   true   # Compile YAML into a cache
+  )
+end
+
 require 'bolt'
 require 'bolt/cli'