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RE: Re: Cleaning the repository...

From: Sébastien Filion <sfilion_at_finrad.com>
Date: 2007-01-17 16:32:09 CET

Hi,

Actually, I have a project that when finishing compiling, it deletes and re-creates a new branch in which we push the new dlls.

But the problem is that the delete operation on the REPO didn't erase the history in the repository for that deleted branch.

Maybe that this kind of files (dlls) is expensive for the Source Control??

Anyway, if there is no best solution than the pattern DUMP\FILTER\RELOAD to clean the repository, I'll use a filesystem for that part of my project.

What did you think about that?

Thanks,
Sebas

-----Original Message-----
From: B. Smith-Mannschott [mailto:benpsm@gmail.com]
Sent: Tuesday, January 16, 2007 5:32 PM
To: hedley.finger@myob.com
Cc: Subversion Users
Subject: Re: Cleaning the repository...

On Jan 16, 2007, at 23:12, hedley.finger@myob.com wrote:

> Andy, Sebastian:
>
>> cheap copies
>
> For the unwashed, unwary, and unclued, what is a "cheap copy"?

With great wisdom, "Version Control with Subversion" speaks so:

# Cheap Copies
#
# Subversion's repository has a special design. When you copy a
# directory, you don't need to worry about the repository growing
# huge-Subversion doesn't actually duplicate any data. Instead, it
# creates a new directory entry that points to an existing tree.
# If you're a Unix user, this is the same concept as a hard-link.
# From there, the copy is said to be "lazy". That is, if you
# commit a change to one file within the copied directory, then
# only that file changes-the rest of the files continue to exist
# as links to the original files in the original directory.
#
# This is why you'll often hear Subversion users talk about "cheap
# copies". It doesn't matter how large the directory is-it takes a
# very tiny, constant amount of time to make a copy of it. In
# fact, this feature is the basis of how commits work in
# Subversion: each revision is a "cheap copy" of the previous
# revision, with a few items lazily changed within. (To read more
# about this, visit Subversion's website and read about the
# "bubble up" method in Subversion's design documents.)
#
# Of course, these internal mechanics of copying and sharing data
# are hidden from the user, who simply sees copies of trees. The
# main point here is that copies are cheap, both in time and
# space. Make branches as often as you want.

<http://svnbook.red-bean.com/nightly/en/svn.branchmerge.using.html>

> If Subversion uses copies, won't a project consisting of thousands of
> files rapidly eat up your disk quota.

Nope. The copies are cheap. Really cheap. And compressed too.

> No doubt this information is in The
> Book

Indeed.

> but I couldn't find it.

// Ben

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Received on Wed Jan 17 16:34:12 2007

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