Jekyll serve fails on Ruby 3.0 (webrick missing) #752
Description
This issue affects
- The site generated by GitHub Pages
- Building sites locally
What did you do (e.g., steps to reproduce)
bundle exec jekyll serve
On macOS 10.15 with Ruby 3.0.0 from Homebrew, using the latest github-pages in a Gemfile.
# Gemfile
gem "github-pages"
# Gemfile.lock:
github-pages (209)
jekyll (= 3.9.0)
…
What happened instead?
bundler: failed to load command: jekyll (/usr/local/lib/ruby/gems/3.0.0/bin/jekyll)
/usr/local/lib/ruby/gems/3.0.0/gems/jekyll-3.9.0/lib/jekyll/commands/serve/servlet.rb:3:in `require': cannot load such file -- webrick (LoadError)
from /usr/local/lib/ruby/gems/3.0.0/gems/jekyll-3.9.0/lib/jekyll/commands/serve/servlet.rb:3:in `<top (required)>'
from /usr/local/lib/ruby/gems/3.0.0/gems/jekyll-3.9.0/lib/jekyll/commands/serve.rb:184:in `require_relative'
from /usr/local/lib/ruby/gems/3.0.0/gems/jekyll-3.9.0/lib/jekyll/commands/serve.rb:184:in `setup'
from /usr/local/lib/ruby/gems/3.0.0/gems/jekyll-3.9.0/lib/jekyll/commands/serve.rb:102:in `process'
from /usr/local/lib/ruby/gems/3.0.0/gems/jekyll-3.9.0/lib/jekyll/commands/serve.rb:93:in `block in start'
from /usr/local/lib/ruby/gems/3.0.0/gems/jekyll-3.9.0/lib/jekyll/commands/serve.rb:93:in `each'
from /usr/local/lib/ruby/gems/3.0.0/gems/jekyll-3.9.0/lib/jekyll/commands/serve.rb:93:in `start'
from /usr/local/lib/ruby/gems/3.0.0/gems/jekyll-3.9.0/lib/jekyll/commands/serve.rb:75:in `block (2 levels) in init_with_program'
from /usr/local/lib/ruby/gems/3.0.0/gems/mercenary-0.3.6/lib/mercenary/command.rb:220:in `block in execute'
from /usr/local/lib/ruby/gems/3.0.0/gems/mercenary-0.3.6/lib/mercenary/command.rb:220:in `each'
from /usr/local/lib/ruby/gems/3.0.0/gems/mercenary-0.3.6/lib/mercenary/command.rb:220:in `execute'
from /usr/local/lib/ruby/gems/3.0.0/gems/mercenary-0.3.6/lib/mercenary/program.rb:42:in `go'
from /usr/local/lib/ruby/gems/3.0.0/gems/mercenary-0.3.6/lib/mercenary.rb:19:in `program'
from /usr/local/lib/ruby/gems/3.0.0/gems/jekyll-3.9.0/exe/jekyll:15:in `<top (required)>'
from /usr/local/lib/ruby/gems/3.0.0/bin/jekyll:23:in `load'
from /usr/local/lib/ruby/gems/3.0.0/bin/jekyll:23:in `<top (required)>'
from /usr/local/Cellar/ruby/3.0.0_1/lib/ruby/3.0.0/bundler/cli/exec.rb:63:in `load'
from /usr/local/Cellar/ruby/3.0.0_1/lib/ruby/3.0.0/bundler/cli/exec.rb:63:in `kernel_load'
from /usr/local/Cellar/ruby/3.0.0_1/lib/ruby/3.0.0/bundler/cli/exec.rb:28:in `run'
from /usr/local/Cellar/ruby/3.0.0_1/lib/ruby/3.0.0/bundler/cli.rb:497:in `exec'
from /usr/local/Cellar/ruby/3.0.0_1/lib/ruby/3.0.0/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
from /usr/local/Cellar/ruby/3.0.0_1/lib/ruby/3.0.0/bundler/vendor/thor/lib/thor/invocation.rb:127:in `invoke_command'
from /usr/local/Cellar/ruby/3.0.0_1/lib/ruby/3.0.0/bundler/vendor/thor/lib/thor.rb:392:in `dispatch'
from /usr/local/Cellar/ruby/3.0.0_1/lib/ruby/3.0.0/bundler/cli.rb:30:in `dispatch'
from /usr/local/Cellar/ruby/3.0.0_1/lib/ruby/3.0.0/bundler/vendor/thor/lib/thor/base.rb:485:in `start'
from /usr/local/Cellar/ruby/3.0.0_1/lib/ruby/3.0.0/bundler/cli.rb:24:in `start'
from /usr/local/Cellar/ruby/3.0.0_1/lib/ruby/gems/3.0.0/gems/bundler-2.2.3/exe/bundle:49:in `block in <top (required)>'
from /usr/local/Cellar/ruby/3.0.0_1/lib/ruby/3.0.0/bundler/friendly_errors.rb:130:in `with_friendly_errors'
from /usr/local/Cellar/ruby/3.0.0_1/lib/ruby/gems/3.0.0/gems/bundler-2.2.3/exe/bundle:37:in `<top (required)>'
from /usr/local/lib/ruby/gems/3.0.0/bin/bundle:23:in `load'
from /usr/local/lib/ruby/gems/3.0.0/bin/bundle:23:in `<main>'
Additional information
Reported upstream at jekyll/jekyll#8523. Upstream has fixed this in the main branch for the next Jekyll 4 release, however this is unlikely to benefit GitHub Pages anytime soon, so it might be good to add this here for the time being.