On Thu, Feb 12, 2009 at 6:26 PM, kiddailey <[email protected]> wrote:
> Are you sure, Ray? When I option+drag to copy in the working copy I
> get an ADD entry in the transcript and I have to perform a commit, so
> it's definitely doesn't look like a cheap copy to me.
>
>From the svn book, it looks like the only difference between branching on
the WC and branching on the repository is the speed of the actual operation:
While it's also possible to create a branch by using svn copy to duplicate a
> directory within the working copy, this technique isn't recommended. It can
> be quite slow, in fact! Copying a directory on the client side is a
> linear-time operation, in that it actually has to duplicate every file and
> subdirectory on the local disk. Copying a directory on the server, however,
> is a constant-time operation, and it's the way most people create branches.
and from svn ? copy:
SRC and DST can each be either a working copy (WC) path or URL:
>
WC -> WC: copy and schedule for addition (with history)
>
WC -> URL: immediately commit a copy of WC to URL
>
URL -> WC: check out URL into WC, schedule for addition
>
URL -> URL: complete server-side copy; used to branch and tag
>
All the SRCs must be of the same type.
>
> WARNING: For compatibility with previous versions of Subversion,
>
copies performed using two working copy paths (WC -> WC) will not
>
contact the repository. As such, they may not, by default, be able
>
to propagate merge tracking information from the source of the copy
to the destination.
>
Versions doesn't show you, but when you copy, the copied file carries a
history property with it, which tells the server where to make the cheap
copy in the repository. There's no such thing as a cheap copy in the
working copy since it's a real file system, but svn makes efforts to
optimize everything when it comes into the repository.
What would be a not cheap copy is if you just copied files through your
Finder or with the regular cp command without svn knowing about it, so it
couldn't track where the file came from and make the cheap copy server-side.
At least, this is how I always thought it worked based on what I've read.
Please correct me.
-Ray
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