事情的起因是升级了macOS，然后homebrew就各种报错。
Error: Can't create update lock in /usr/local/var/homebrew/locks!
Fix permissions by running:
sudo chown -R $(whoami) /usr/local/var/homebrew
Traceback (most recent call last):
11: from /usr/local/Homebrew/Library/Homebrew/brew.rb:31:in `<main>'
10: from /usr/local/Homebrew/Library/Homebrew/brew.rb:31:in `require_relative'
9: from /usr/local/Homebrew/Library/Homebrew/global.rb:80:in `<top (required)>'
8: from /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.6.3_2/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
7: from /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.6.3_2/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
6: from /usr/local/Homebrew/Library/Homebrew/os.rb:7:in `<top (required)>'
5: from /usr/local/Homebrew/Library/Homebrew/os.rb:43:in `<module:OS>'
4: from /usr/local/Homebrew/Library/Homebrew/os/mac.rb:60:in `prerelease?'
3: from /usr/local/Homebrew/Library/Homebrew/os/mac.rb:28:in `version'
2: from /usr/local/Homebrew/Library/Homebrew/os/mac/version.rb:33:in `from_symbol'
1: from /usr/local/Homebrew/Library/Homebrew/os/mac/version.rb:33:in `fetch'
/usr/local/Homebrew/Library/Homebrew/os/mac/version.rb:33:in `block in from_symbol': unknown or unsupported macOS version: :dunno (MacOSVersionError)
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