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One thing I've desperately wanted from git worktrees is to use reflinking in some way to lower the cost of copies.

I just found https://github.com/josharian/git-cow-worktree that doesn't inspire confidence.

You could try proposing a worktree copy command on the mailing list. Worktrees are currently independent and work off of repositories which may have no existing worktree / working copy at all, let alone one it makes sense to start from, so there is bothing to copy but for dodgy heuristics.

I recently open sourced the worktree wrapper we use at my workplace, which uses reflinking in this way.

https://github.com/Applied-Intuition-Open-Source/stol

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