MacOS: brew upgrade: Error: cannot load such file -- reline

[tradespite]

Since 09.12.2020 my brew upgrade isn't working anymore:

> brew upgrade                                                                                                                                        
Error: cannot load such file -- reline
/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.6.3_2/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:130:in `require'
/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.6.3_2/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:130:in `rescue in require'
/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.6.3_2/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:34:in `require'
/Users/lukas.heilmann/.gem/ruby/2.6.0/gems/irb-1.2.7/lib/irb.rb:13:in `<top (required)>'
/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.6.3_2/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:65:in `require'
/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.6.3_2/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:65:in `require'
/usr/local/Homebrew/Library/Homebrew/debrew/irb.rb:4:in `<top (required)>'
/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'
/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'
/usr/local/Homebrew/Library/Homebrew/debrew.rb:5:in `<top (required)>'
/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'
/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'
/usr/local/Homebrew/Library/Homebrew/formula_installer.rb:13:in `<top (required)>'
/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'
/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'
/usr/local/Homebrew/Library/Homebrew/cmd/upgrade.rb:5:in `<top (required)>'
/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'
/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'
/usr/local/Homebrew/Library/Homebrew/utils.rb:91:in `require?'
/usr/local/Homebrew/Library/Homebrew/commands.rb:35:in `valid_internal_cmd?'
/usr/local/Homebrew/Library/Homebrew/brew.rb:85:in `<main>'

Other brew commands are working like update, config, doctor

config:

> brew config                                                                                                                                       
HOMEBREW_VERSION: 2.6.1
ORIGIN: https://github.com/Homebrew/brew
HEAD: 2c77a540b522c2eee74af0745851167412adb83b
Last commit: 2 days ago
Core tap ORIGIN: https://github.com/Homebrew/homebrew-core
Core tap HEAD: 2b03686b37aacc420d11e9126dfd96f97fc0ab18
Core tap last commit: 31 minutes ago
Core tap branch: master
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CASK_OPTS: []
HOMEBREW_MAKE_JOBS: 12
Homebrew Ruby: 2.6.3 => /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.6.3_2/bin/ruby
CPU: dodeca-core 64-bit kabylake
Clang: 12.0 build 1200
Git: 2.29.2 => /usr/local/bin/git
Curl: 7.64.1 => /usr/bin/curl
Java: 11.0.9, 1.8.0_271, 1.7.0_80
macOS: 10.15.7-x86_64
CLT: 12.2.0.0.1.1604628099
Xcode: 12.2

doctor:

>brew doctor                                                                                                                                         
Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry or file an issue; just ignore this. Thanks!

Warning: You have unlinked kegs in your Cellar.
Leaving kegs unlinked can lead to build-trouble and cause brews that depend on
those kegs to fail to run properly once built. Run `brew link` on these:
  kubernetes-cli

I tried some things to fix it, but it didn't helped.
I have no idea anymore, maybe someone of you?

[hyuraku]

Could you try gem install reline ?

[tradespite]

Sadly still same error:

> gem install reline                                                                                    
Successfully installed reline-0.1.9
Parsing documentation for reline-0.1.9
Done installing documentation for reline after 0 seconds
1 gem installed
> brew upgrade                                                                                          
Error: cannot load such file -- reline
...

[carlocab]

How about

/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.6.3_2/bin/gem install reline

?

[tradespite]

How about

/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.6.3_2/bin/gem install reline

?

Nice, that fixed my problem!

[equal-l2]

Maybe you want to try brew update-reset.
This restores Homebrew and taps to their original state (i.e. discard all local changes).

[tradespite]

Already tried it, it didn't helped.

[gromgit]

What does git -C $(brew --repo) status output?

[tradespite]

> git -C $(brew --repo) status                                                                                                                 
On branch master
Your branch is up to date with 'origin/master'.

nothing to commit, working tree clean

[gromgit]

OK, the Homebrew repo itself is clean, now to find that reline:

grep -Fwr reline $(brew --repo)

[tradespite]

No match:

> grep -Fwr reline $(brew --repo)                                                                                                                     
>