"brew update" fails with: fatal: git-write-tree: error building trees

Post date: Jan 18, 2016 8:28:08 PM

I ran "brew update" and received the error message "fails with: fatal: git-write-tree: error building trees ..." The issue is resolved by the following steps:

Go to /usr/local and run

Now you can run brew command
1. > brew update
2. > brew upgrade
3. > brew install your_package

Here is what I tried on my terminal

> git reset --hard origin/master; git checkout --force master

> cd /usr/local/

> git status

On branch master

Unmerged paths:

  (use "git reset HEAD <file>..." to unstage)

  (use "git add <file>..." to mark resolution)

both modified: Library/Formula/python.rb

no changes added to commit (use "git add" and/or "git commit -a")

> git reset --hard origin/master; git checkout --force master

HEAD is now at ef28579 ipfs: update 0.3.10 bottle.

Already on 'master'

> git status

On branch master

nothing to commit, working directory clean

> brew update

> brew upgrade

> brew install <whatever_package>

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