On Wed, 17 Sep 2014 05:52:29 -0700 (PDT)
Dmitry Moscow <koktebelnig...@gmail.com> wrote:
> I come from an SVN background, and I have a hard time grasping Git's
> philosophy. In particular, I'm confused by the following.
> Imagine I have made some changes in my working dir. If I switch to
> another branch, the changes*remain*, which is very unusual, from
> an SVN point of view. This means that uncommitted changes are*shared*
> between the branches. Moreover, the "stage property" of the files is
> also *shared* between the branches: if I call git add * in one
> branch, then all the files will be added to next commit in all the
> branches. Looks like my branches differ only by already *committed*
> So, if uncommitted data are *shared*, then, no matter which branch
> I am on now, I will commit *all the staged files*, even if they were
> added in different branches! As I come from an SVN background, this
> strikes me as very odd.
> Am I correct, or am I just confused? Why does Git work in this way?
> Sometimes, Git tells me something like this:
> Cannot switch to another branch because your changes will be
> erased. Commit them first.
> In SVN, that's not a problem: branches are *independent*. Why and
> when does this happen in Git?
With regard to the behaviour you describe Git is not different from
Subversion: changes made to the checkout (Git calls it "work tree",
Subversion calls it working directory, IIRC) do not belong to any tree
in both of these systems, instead, they are *based* on a specific state
of the project -- the one being checked out at the time the changes
If this will help you to build a correct mental model, `git branch foo`
behaves much like Subversion's `svn switch ^/branches/foo`.
Again, whatever uncommitted changes you have in your checkout are not
on any branch until they're actually committed.
If you want to persist them while switching branches in Git, there are
* The stash. This is a special area which might keep uncommitted
changes and apply them back.
Read up any book on Git to get more info.
* Make a temporary commit, then switch the branch.
No, really, this is not Subversion, so it's perfercly OK to create
an ugly, work-in-progress commit and then later either refine it
through `git commit --amend` or throw it away completely and replace
with another one or even a series of commits.
Again, any book on Git will get you up to speed with the `git reset`
command which does this (and other things).
* Use another work tree attached to the same repository.
This is sort of a hack (even though it's official) and works
only on POSIX systems (having true symlinks on their filesystems).
Can be done using the git-new-worktree  script.
> What's up with the way Git handles folders? If I create a new
> folder, it is not displayed in Git's status report. Does Git simply
> not care about folders?
Git does not explicitly track directories. A directory only become
tracked when you `git add` at least one file in it (as a byproduct of
tracking that file). This topic has been beaten to death already so
please search this group's acrhives (using Google's web front-end for
it, for instance) for git+tracks+content.
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