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by gwerbin 84 days ago
Git leaks a lot of implementation details into its UX. Rebasing is meant to be equivalent to checking out the "base" branch and cherry picking commits onto it. Therefore "ours" during a rebase is the base branch.

The meaning of "ours" and "theirs" is always the same, but the "base" of the operation is reversed compared to what you might be used to during merge.

Rebasing can be confusing and hard and messy, but once I learned that rule and took the time to internalize it, I at least never got confused on this particular detail again.

> fake history

That's the thing, it's not actually fake history. Git really is doing the things it looks like it's doing during a rebase. That's why you can do all kinds of weird tricks like stopping in the middle to reset back a commit in order to make a new intervening commit. The reason you can abort at any time with (almost) no risk is because the old history is still hanging around in the database and won't be removed until GC runs, usually long after the rebase is settled.

3 comments

Learning git properly is pretty much "read Git book at least 3 times".

All of it makes sense and is decently intuitive once you know how internals work.

People keep imagining git as a series of diffs while in reality it's series of the filesystem tree snapshots + a bunch of tools to manage that and reconcile changes in face of merge. And most of that can be replaced if the builtins are not up to task. And the experience is getting slowly better but it's balance between power users and newbies, and also trying to not break stuff when going forward.

Now of course that sucks if programming is not someone's day job but there is plenty of tools that present simpler workflows built on top of that.

Also git store (almost?) all its operations in the reflog. They have identifier like commits so you can reset to them and restore the original state of the working directory (mostly after an automatic rebase gone wrong).
That's the thing, they're not "like commits", they are the actual original commits. It's a history of where the HEAD ref used to be. Eventually those commits will be pruned out of the tree if/when the reflog expires because there is nothing left pointing to them. But otherwise they are normal commits.
I think what the grandfather comment meant is 'like' in the sense of 'this is an example'. Not 'like' in the sense of 'sorta / approximately'.
Yes, Git is like a Copy-on-Write filesystem.

It's interesting that once even C programmers, like Linus, become really experienced, they embrace the wisdom that functional programmers are forced to swallow anyway.