$ brew cask update
==> error: The following untracked working tree files would be overwritten by merge:
==> Library/Formula/cake.rb
==> Please move or remove them before you can merge.
==> Aborting
==> Error: Failure while executing: git pull -q origin refs/heads/master:refs/remotes/origin/master
error: The following untracked working tree files would be overwritten by merge:
Library/Formula/cake.rb
Please move or remove them before you can merge.
Aborting
Error: Failure while executing: git pull -q origin refs/heads/master:refs/remotes/origin/masterどうもgitで管理していないformulaがあってmergeできないみたい。リポジトリからfetchしてきてその状態にresetしてあげれば良いらしい。
$ cd /usr/local $ git fetch $ git reset --hard origin/master
$ brew cask update # うまくいく
参考
