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Nice.

For years I've been using [direnv](https://direnv.net/) for this, setting environment variables which git picks up. This looks like a more feature complete equivalent, although to be honest I only really need switching of committer email and the SSH key used.

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For the SSH part you can use ~/.ssh/config and it also has conditional stanzas like "Host foo.com" or "Host *.foo.com". Can set username, SSH Key, SSH Agent Socket (I use multiple SSH agents), etc.

meh.

it's much easier to have a conditional git config in ~/.gitconfig that modifies the git ssh command to explicitly use a different ssh key.

You don’t need for config for the SSH piece as it defers to SSH’s own config for it.

If you’re using SSH for commit signing, you do need that in your git configuration.

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