How can I activate truncate-lines in magit only

Question

I want to long commit messages to be truncated rather than wrapped around in magit buffers only because I can simply open a commit to see the full message.

I tried

(add-hook 'magit-mode-hook (lambda () (setq truncate-lines t)))

but that didn't have any effect; truncate-lines is still nil when I eval it in a magit buffer.

I'm using Spacemacs if that makes a difference.

Answer 1

truncate-lines is enabled by default in magit-mode buffers, so your hook function isn't actually changing anything.

You need to find what else it is that you'd previously done in your config to prevent that setting from remaining in effect.