Brew: homebrew totally broken on macOS Sierra 10.12.4

[CaptainFatty]

Hello,

Whatever I do (install, uninstall, doctor, update) I get this error:

Sirenia:$ brew update
/Library/Ruby/Site/2.0.0/rubygems/core_ext/kernel_require.rb:54:in require': cannot load such file -- mach (LoadError) from /Library/Ruby/Site/2.0.0/rubygems/core_ext/kernel_require.rb:54:inrequire'
from /usr/local/Library/Homebrew/extend/pathname.rb:2:in <top (required)>' from /Library/Ruby/Site/2.0.0/rubygems/core_ext/kernel_require.rb:54:inrequire'
from /Library/Ruby/Site/2.0.0/rubygems/core_ext/kernel_require.rb:54:in require' from /usr/local/Library/Homebrew/global.rb:3:in from /Library/Ruby/Site/2.0.0/rubygems/core_ext/kernel_require.rb:54:in require' from /Library/Ruby/Site/2.0.0/rubygems/core_ext/kernel_require.rb:54:inrequire'
from /usr/local/Library/brew.rb:15:in `

'

Oh dear. It's never done that before... Does anyone know what's happened and how to get me brewing again?

Thanks.

Cheers,
Matt

[MikeMcQuaid]

Please always fill in the issue template as requested.

Does anyone know what's happened

No idea, sorry.

how to get me brewing again?

Try to run brew update-reset and then brew update again.

[CaptainFatty]

Ah, ok, sorry.
Same old error - I'll re-install Sierra I think.

Cheers,
Matt

[vitorgalvao]

@CaptainFatty You should also put your code in issues in fenced code blocks.

I'll re-install Sierra I think.

Closing, then.

[jwmapana]

I'm having this problem after upgrading to High Sierra. No command works at all.

/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in require': cannot load such file -- mach (LoadError) from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:inrequire'
from /usr/local/Library/Homebrew/extend/pathname.rb:2:in <top (required)>' from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:inrequire'
from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in require' from /usr/local/Library/Homebrew/global.rb:3:in from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in require' from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:inrequire'

from /usr/local/Library/brew.rb:15:in `<main>'

[MikeMcQuaid]

@jwmapana Run brew update-reset if that works or otherwise uninstall and install Homebrew again.

[ilovezfs]

It is also worth trying

sudo chown -R $(whoami) /usr/local/*

if brew update-reset doesn't do the trick.

[LingyanYin]

I have the similar issue! brew anything won't work, just give me the error:
/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- mach (LoadError)

[MikeMcQuaid]

@LingyanYin What does brew update-reset output?

[LingyanYin]

@MikeMcQuaid Thanks for reaching out. It gave me the same output.

brew update-reset
/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in require': cannot load such file -- mach (LoadError) from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:inrequire'
from /usr/local/Library/Homebrew/extend/pathname.rb:2:in <top (required)>' from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:inrequire'
from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in require' from /usr/local/Library/Homebrew/global.rb:3:in from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in require' from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:inrequire'
from /usr/local/Library/brew.rb:15:in `

'

[MikeMcQuaid]

@LingyanYin Try cd "$(brew --repo)"; git fetch; git reset --hard origin/master

[LingyanYin]

@MikeMcQuaid Still the same error. I also tried to re-start my macbook and same error still occurred. I just upgrade my IOS to high seirra yesterday... Today when I tried to use homebrew, then it failed totally...

cd "$(brew --repo)"

/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in require': cannot load such file -- mach (LoadError) from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:inrequire'
from /usr/local/Library/Homebrew/extend/pathname.rb:2:in <top (required)>' from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:inrequire'
from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in require' from /usr/local/Library/Homebrew/global.rb:3:in from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in require' from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:inrequire'
from /usr/local/Library/brew.rb:15:in `

'

[MikeMcQuaid]

@LingyanYin Uninstall and reinstall Homebrew through https://github.com/homebrew/install.

[LingyanYin]

Thanks. This is my last resort which everything installed through homebrew will be also re-installed, too.

[MikeMcQuaid]

@LingyanYin Ok, last thing to try: cd /usr/local; git fetch; git reset --hard origin/master

[LingyanYin]

Thanks! I have fixed it! :) 👍

[Gr3g0]

I'm having the exact same issue LingyanYin - do you recall what steps you took to fix it? Thanks!

[LingyanYin]

Hi, there is no walk-around way to solve this. You have to remove and reinstall the homebrew totally (following the instructions through https://github.com/homebrew/install)... and all the stuff you installed through homebrew previously needs reinstalled, too... Hope it helps :)

[Gr3g0]

Yes, that is what I wound up doing myself. Then, I just found this which may be the better way to go on High Sierra for other users:
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

[eugeniaharris]

The ruby trick fixed it for me in High Sierra 10.13.3, thank you Gr3g0!