can't access github via https after upgrade to Yosemite

Question

I can't access GitHub via https after upgrade my Mac to Yosemite.

fatal: unable to access 'https://github.com/caskroom/homebrew-cask/': SSL: can't load CA certificate file

Actually,it's brew update,most of brew operations are via https when requesting github repo.

Answer 1

Using git version 2.1.2 (on Yosemite) I'm able to download the repo just fine:

git clone https://github.com/mitsuhiko/flask.git/
Cloning into 'flask'...
remote: Counting objects: 10113, done.
remote: Compressing objects: 100% (15/15), done.
remote: Total 10113 (delta 2), reused 5 (delta 1)
Receiving objects: 100% (10113/10113), 4.66 MiB | 1.52 MiB/s, done.
Resolving deltas: 100% (6112/6112), done.
Checking connectivity... done.

Answer 2

You can try switching to ssh:

 git clone git@github.com:mitsuhiko/flask.git

With https, you need to have your CAs (Certificate Authorities) in order ( as in this question ).