Re: why tagging?

Hi Kychan,

kychan wrote:
> I'm just thinking "why tagging". I know a tag in svn is sort of a copy
> of a particular revision. But I don't want this happens, all I want is
> to "mark" a particular revision as "something" (e.g. release 1.1.2b),
> and the repo should be getting bigger in size which is unnecessary I
> think.
>
> So am I wrong? Any ideas?

Tagging is, as you say "just marking a particular revision as
something". Rather, it's marking part of the repository at a given
revision as something.

If you follow the reccommended filesystem layout for your repository,
you have
trunk/(files)
branches/(branch names)/(files)
tags/(tag names)/(files)

Creating a tag is simply doing an svn cp of the trunk or a branch to the
tags directory, taking a snapshot of that part of the repository at that
moment. The repository does get bigger, by the size of one directory
node. And this is the smallest possible increment you can have.

Say I have
branches/1.1/stuff

and I want to make release 1.1.3. I'd just go
svn cp file://repos/branches/1.1 file://repos/tags/1.1.3
now everything in tags/1.1.3 is the same as in 1.1 (only the directory
gets copied - this is called a shallow copy), and I can carry on
committing stuff to branches/1.1.

To make a directory a tag, you just have to not commit any changes into it.

Cheers,
Dave.

-- 
David Neary
Phenix Engineering
110 ave Jean Jaures, 69007 Lyon
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