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Last active July 5, 2017 12:21
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opam 1.2.2 to 2.0.0 and back with brew on macOS
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opam-v2-testing.md

From opam 1.2.2 to 2.0.0 and back with homebrew on macOS

With these instructions you can try 2.0.0 for your day to day work but quickly and safely go back to 1.2.2 if you hit a wall. This maintains both setup entirely isolated.

Going to 2.0.0 for the first time:

> mv ~/.opam ~/.opam-v1 # Save your old setup, use cp -r if you want
                        # to upgrade your existing v1 install to v2
> brew unlink opam
> brew install opam@2
> opam init
> ...

Going back to 1.2.2:

> mv ~/.opam ~/.opam-v2
> mv ~/.opam-v1 ~/.opam
> brew unlink opam@2
> brew link opam

And... you get the idea, the reverse dance will bring you back to 2.0.0.

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