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RE: Help explain peg revisions

From: Gale, David <David.Gale_at_Hypertherm.com>
Date: 2006-03-16 18:36:31 CET

Scott Palmer wrote:
> On 16-Mar-06, at 10:05 AM, David Heppenstall wrote:
>
> Do you want to checkout the 5th revision? If so:
>
> svn checkout <URL>@5 ... [PATH]
>
>
>
> This has come up before and I keep seeing posts that seem to
> contradict each other.
>
> Shouldn't that be:
>
> svn checkout -r5 <url>
>
>
> I thought peg revisions were for finding a path that might have a
> different name in HEAD, not to specifiy which revision to actually
> get. In other words, if I want to check out the HEAD revision of
> something that had the name "foo" in rev 5 but was later renamed (to
> some name that I don't know, otherwise I would use it) would I not
> do:
>
> svn checkout url-to-foo@5
>
> ?
>
> Yet in some posts, such as the one quoted above it seems to imply
> that the peg revision will be used as if it was also passed with "-r"
>
> Do I have to be explicit about specifying the HEAD revision like:
>
> svn checkout -rHEAD url-to-foo@5
>
> .. if so then I missed the part in the docs that mentions this
> exception to the rule checking out a url defaults to HEAD.
>
> Scott

In the situation given (file modified between revisions 5 and 10, and we
want to get what it was in revision 5), you only need "svn co -r5
url-to-foo", which is equivalent to "svn co -r5 url-to-foo@HEAD", and
which means "checkout the file currently named foo that existed in
revision 5". The syntax given by Mr. Heppenstall (svn checkout
<URL>@5..." is wrong; it's full equivalent is "svn co -rHEAD <URL>@5",
which means "checkout the current revision of the file that was at this
URL at revision 5".

The only time you really need to specify both a -r argument and a peg
revision is when a file has been (potentially) deleted or moved, and you
know what its name was at some point in the past. Your original
understanding was correct.

-David

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Received on Thu Mar 16 18:37:41 2006

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