Re: Update to revision

On 30.03.2012 15:01, Simon Large wrote:
> On 30 March 2012 13:55, Jean-Marc van Leerdam<j.m.van.leerdam_at_gmail.com> wrote:
>> Hi,
>>
>> On 30 March 2012 13:59, Stefan Küng<tortoisesvn_at_gmail.com> wrote:
>>>
>>> On 30.03.2012 13:56, Tobias Richter wrote:
>>>> Hi *,
>>>>
>>>> if I use the "Update to revision" my local working copy is updated to
>>>> revision x but all the externals are still coming from the head
>>>> revision or the explicit revision which was set through the properties.
>>>>
>>>> My suggestion: an option that I also get the externals from the revision
>>>> x ...
>>>
>>> So you mean if I want to update my TSVN working copy to e.g. revision
>>> 22700 then all the externals (subversion, apr, neon, ...) it uses should
>>> also update to that revision?
>>>
>>
>> I think the OP means that the externals are to be updated to a revision that
>> was appropriate at the time rev. 22700 was created; he did not mean to reuse
>> the 22700 as a rev no for the externals.
>>
>> Now, that info is probably not available for externals that were not linked
>> to an explicit revision at that time, but for fixed externals it could be
>> possible. The question remains if this is a feasible option to provide and
>> if it requires additional SVN support to implement this.
>>
>> IIRC, there is an option when tagging/branching to freeze externals pointing
>> to HEAD to a fixed revision? Maybe the OP can use that to achieve his goal?
>
> That is exactly what you have to do when branching/tagging, and when
> using an external repository. And that is what our docs recommend.
> However there is another use case where you are using externals as a
> convenience to reference some other part of your own repository, for
> example a common library. In that case for trunk development you would
> normally be working with the HEAD revision for both project and
> externals. If you then want to go back in time perhaps to track down
> when a bug was introduced, you would want both project and externals
> to go back to the same earlier revision.

And that's maybe convenient, but dangerous and should be avoided.
Because if the external is changed (e.g. a bug fix) it is possible that
this change breaks the build for that project. Or introduces some other
problems. If you link always to head of such a "moving target" then you
can easily break something.

> So maybe what the OP wants is an option to update any externals which
> are in the same repository to be at the specified revision.

While I understand the reasons for this, there are several reasons I
won't do anything here:

* first of all, updating is done in the svn library. Which means this
must be done in the svn library and can not be done in TSVN.
* second: as I already said this situation is bad by design.
Implementing something like this would just encourage this bad design
further.

Stefan

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