Sharan Basappa <sharan.basa...@gmail.com> writes:
> I am pretty much new to Git though I am using it for a couple of projects
> (without much understanding as such).
> In Git documents, it is mentioned that Git stores data as a stream of
> snapshots. Compared to other VCS tools, the only difference I am able
> to tell is that Git stores the entire file for each versions while
> other VCS tools might store only differences.
> Can someone help me understand this?
Actually, you don't *need* to understand how it's done. You do need to
understand that Git commands are organized around the idea that commits
are a total copy of your project.
OTOH, you need to be careful. Some commands, particularly ones
involving merging and "rebase" actually *do* think of commits not as
snapshots but as the difference between the commit and its parent. That
is how you can "reorder" two commits -- changing the commit order from A
- B - C is actually constructing new commits D and E so that in the new
commit order A - D - E, the difference between A and D is the same as
the difference between B and C, and the difference between D and E is
the difference between A and B.
But even in this situation, what is *stored* is a sequence of commits
(done with sophisticated compression) -- the merge or rebase command
calcuates the differences based on the contents of the old commits, and
then constructs a new set of commits that have the proper differences
between them, and then stores the new commits.
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