git-replace - Create, list, delete refs to replace objects
Adds a replace reference in .git/refs/replace/
The name of the replace reference is the SHA1 of the object that is replaced. The content of the replace reference is the SHA1 of the replacement object.
Unless -f is given, the replace reference must not yet exist in .git/refs/replace/ directory.
If an existing replace ref for the same object exists, it will be overwritten (instead of failing).
Delete existing replace refs for the given objects.
List replace refs for objects that match the given pattern (or all if no pattern is given). Typing "git replace" without arguments, also lists all replace refs.
Comparing blobs or trees that have been replaced with those that replace them will not work properly. And using git reset --hard to go back to a replaced commit will move the branch to the replacement commit instead of the replaced commit.
There may be other problems when using git rev-list related to pending objects. And of course things may break if an object of one type is replaced by an object of another type (for example a blob replaced by a commit).
Part of the git(1) suite