How to change the SHA-1 of a specific commit in place with git?

Question

The target commit may have parents and descendants.

it needs to replace the old commit in place,

so it\'s not as simple as cherry c

Answer 1

No, you can't do that.

The point of SHA-1 is to prevent changes like these. The whole git architecture depends on the assumption that SHA-1 uniquely identify the object in all git repository. No way to workaround this (not without redesigning everything, that is).

The details are explained in the Git Magic book.