Error when trying to brew update

Question

error: The last gc run reported the following. Please correct the root cause and remove .git/gc.log. Automatic cleanup will not be performed until the file is removed.

warning: There are too many unreachable loose objects; run 'git prune' to remove them.

brew works fine, he only show this error when i update him

Answer 1

You can fix this issue by running two commands:

cd "$(brew --repo)" # Navigate to Homebrew's git repository git prune && git gc # Remove loose objects 

To check :

cd - # Go back to the original location brew update 

Output:

Already up-to-date.

Error should be fixed and gone! :)

Answer 2

If you run %> locate gc.log you will likely see something along the lines of this in the output:

/usr/local/Library/Taps/caskroom/homebrew-versions/.git/gc.log 

In this case, to fix the problem, I went to /usr/local/Library/Taps/caskroom and ran

%> git prune

%> rm /usr/local/Library/Taps/caskroom/homebrew-versions/.git/gc.log

and the problem went away.