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Re: [PATCH] Hackathon project: Dumping viewspec

From: Johan Corveleyn <jcorvel_at_gmail.com>
Date: Mon, 27 Nov 2017 10:19:48 +0100

On Sun, Nov 26, 2017 at 11:50 PM, Stefan <luke1410_at_posteo.de> wrote:
> On 25/11/2017 16:12, Stefan Sperling wrote:
>> On Fri, Nov 24, 2017 at 02:42:05PM +0100, Bert Huijben wrote:
>>> Hi,
>>>
>>> At the Aachen hackathon I promised to write some code to spit out the sparse
>>> definition of a working copy, or in other words some initial dumb viewspec
>>> output.
>>>
>>> Testing this on a test working copy with
>>> [[
>>> $ svn switch --list \SharpSvn\trunk
>> Has a new 'svn viewspec' been subcommand considered?
>> 'switch --list' reminds me of our 'switch --relocate' mistake
>> from the past ;)
>
> Indeed it was. FWIW I agree there are good arguments for a new viewspec
> subcommand.
>
> The alternative would be to use "svn list --generate-viewspec" and "svn
> switch/checkout --use-viewspec < viewspecfile" or something like this.
> The obvious downside would be that one subcommand would be used to
> generate the viewspec while another one would be used to apply it. I
> think Bert brought up other arguments against adding it to "svn list".

I prefer adding the "export the viewspec info from this WC" to "svn
info", because that's what we already use to obtain info from a
working copy (including depth and working revision). Perhaps "svn info
-R --viewspec". Let's say this would generate some structured
information in a well defined syntax.

The exported info can then be used as optional input for several commands:

    svn checkout $URL --apply-viewspec vspecfile.txt
    svn update . --apply-viewspec vspecfile.txt
    svn switch . --apply-viewspec vspecfile.txt (perhaps the
viewspec contains switched subtrees, which necessitates the 'switch'
command to execute)

Maybe the viewspec could also be read from standard input (by using '-'):

    svn info -R --viewspec WC1 | svn update WC2 --viewspec -

?

A separate 'viewspec' subcommand might also be interesting, but I'm
not sure what we'll be using it for exactly (only for exporting
viewspecs from WCs?).
I think we need to think about two different things:

(1) Export / describe the viewspec of a specific working copy.
(2) Apply a viewspec to a working copy (or when creating a working copy)

IMHO, the "applying" needs to be part of several commands that create
/ modify working copies (checkout, update, switch, perhaps export).

-- 
Johan
Received on 2017-11-27 10:20:22 CET

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