How to migrate from other managers while keeping git history?

[jdevera]

I want to move to chezmoi from my custom script, but from what I see in the docs this goes through creating a new repo. But I want to keep my history of changes to my dot files. Has anybody done this? and how?

Just to clarify, I'd like the .bashrc that I add to chezmoi to appear as the continuation in history of the bashrc that my repo already knows about.

[jdevera]

Duplicate of #2330, which of course I only found AFTER posting this.