git.init() with gitdir set behaves differently to git init --separate-git-dir=foo

[AtkinsSJ]

I'm developing a browser-based git client using isomorphic-git, and noticed a couple of differences here against the official git client:

• With the official git CLI, git init --separate-git-dir=foo creates a .git text file containing gitdir: /repo/foo/. isomorphic-git does not do this.
• If this git init is run inside an existing repo directory, the git CLI moves the contents of the gitdir to the new location, whereas isomorphic-git does not do so.

For the second one, it's possible that isomorphic-git just doesn't handle git init in an existing repo at all, but I'm not far enough with my client to know if that's the case. 😅

Neither of these is a big issue (because who even uses a different git dir?) but I thought it was worth reporting anyway. 🙂

I'm using isomorphic-git in the browser, bundled using rollup.