更新碼雲博客后，想在本地測試一下。上次更新倉庫是2年前了，這次爆出一堆問題，參考網上一篇文章解決了。
報錯
% jekyll serve
zsh: /usr/local/bin/jekyll: bad interpreter: /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/bin/ruby: no such file or directory
查看ruby版本
% ruby --version
ruby 2.6.3p62 (2019-04-16 revision 67580) [universal.x86_64-darwin19]
一、更新jekyll
sudo gem install bundler jekyll
又裝了一大堆東西。
新的報錯
% jekyll serve
Traceback (most recent call last):
12: from /usr/local/bin/jekyll:23:in `<main>'
11: from /usr/local/bin/jekyll:23:in `load'
10: from /Library/Ruby/Gems/2.6.0/gems/jekyll-4.0.0/exe/jekyll:11:in `<top (required)>'
9: from /Library/Ruby/Gems/2.6.0/gems/jekyll-4.0.0/lib/jekyll/plugin_manager.rb:52:in `require_from_bundler'
8: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/bundler.rb:107:in `setup'
7: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/bundler/runtime.rb:20:in `setup'
6: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/bundler/runtime.rb:108:in `block in definition_method'
5: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/bundler/definition.rb:226:in `requested_specs'
4: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/bundler/definition.rb:237:in `specs_for'
3: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/bundler/definition.rb:170:in `specs'
2: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/bundler/spec_set.rb:85:in `materialize'
1: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/bundler/spec_set.rb:85:in `map!'
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/bundler/spec_set.rb:91:in `block in materialize': Could not find public_suffix-3.0.2 in any of the sources (Bundler::GemNotFound)
更新bundle。很慢，還以為卡死了。中間要輸密碼。
太慢了，因為Gemfile.lock寫死了gem的源：
GEM
remote: https://rubygems.org/
改鏡像
$ bundle config mirror.https://rubygems.org https://gems.ruby-china.com
改完鏡像，瞬間升級完成
% bundle update
還是報錯
% jekyll serve
Traceback (most recent call last):
10: from /usr/local/bin/jekyll:23:in `<main>'
9: from /usr/local/bin/jekyll:23:in `load'
8: from /Library/Ruby/Gems/2.6.0/gems/jekyll-4.0.0/exe/jekyll:11:in `<top (required)>'
7: from /Library/Ruby/Gems/2.6.0/gems/jekyll-4.0.0/lib/jekyll/plugin_manager.rb:52:in `require_from_bundler'
6: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/bundler.rb:107:in `setup'
5: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/bundler/runtime.rb:26:in `setup'
4: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/bundler/runtime.rb:26:in `map'
3: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/forwardable.rb:230:in `each'
2: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/forwardable.rb:230:in `each'
1: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/bundler/runtime.rb:31:in `block in setup'
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/bundler/runtime.rb:319:in `check_for_activated_spec!': You have already activated i18n 1.8.2, but your Gemfile requires i18n 0.9.5. Prepending `bundle exec` to your command may solve this. (Gem::LoadError)
解：
加上bundle exec，運行成功
% bundle exec jekyll serve
Configuration file: /Users/luojinrong/code/GitHub/obarong.github.io/_config.yml
Source: /Users/luojinrong/code/GitHub/obarong.github.io
Destination: /Users/luojinrong/code/GitHub/obarong.github.io/_site
Incremental build: disabled. Enable with --incremental
Generating...
Jekyll Feed: Generating feed for posts
done in 0.708 seconds.
Auto-regeneration: enabled for '/Users/luojinrong/code/GitHub/obarong.github.io'
Server address: http://127.0.0.1:4000/
Server running... press ctrl-c to stop.
二、升級本地倉庫用的Jekyll版本（這節可以跳過）
在倉庫目錄查看Jekyll版本會出現之前那個報錯，要去沒有Gemfile的目錄。
% jekyll -v
jekyll 4.0.0
在倉庫目錄實際用的是3.8.6
% bundle exec jekyll -v
jekyll 3.8.6
修改Gemfile
gem "jekyll", "~> 4.0.0"
更新
% bundle install
The dependency tzinfo-data (>= 0) will be unused by any of the platforms Bundler is installing for. Bundler is installing for ruby but the dependency is only for x86-mingw32, x86-mswin32, x64-mingw32, java. To add those platforms to the bundle, run `bundle lock --add-platform x86-mingw32 x86-mswin32 x64-mingw32 java`.
Fetching gem metadata from https://rubygems.org/............
Fetching gem metadata from https://rubygems.org/..
You have requested:
jekyll ~> 4.0.0
The bundle currently has jekyll locked at 3.8.6.
Try running `bundle update jekyll`
If you are updating multiple gems in your Gemfile at once,
try passing them all to `bundle update`
% bundle update jekyll
成功升級倉庫的Jekyll。這下可以直接執行jekyll serve了。
三、本地改用GitHub pages主題
為什么GitHub pages的顯示效果比我本地的好？
修改Gemfile
#gem "jekyll", "~> 4.0.0"
……
gem "github-pages", group: :jekyll_plugins
報錯
% bundle update github-pages
Could not find gem 'github-pages'.
解：
% sudo gem install github-pages
install和update走起
% bundle update
這下本地瀏覽效果跟GitHub一模一樣，但是要加bundle exec啟動。
參考
解決因macOS High Sierra更新Ruby到2.3造成的Jekyll不能啟動的問題 | 大專欄
https://www.dazhuanlan.com/2019/08/21/5d5c525c9e454/
bundle install 無響應問題 | 大專欄
https://www.dazhuanlan.com/2020/01/07/5e142e02df589/
個人博客搭建之一步步使用Github Page創建博客主頁（2） | 大專欄
https://www.dazhuanlan.com/2020/02/02/5e366f389c663/