Hi Doug,
               So if I remember correctly p4 supports this, when you "p4 edit" a file it will tell you if anyone else has already done "p4 edit" on the file.

cheers
Mark

On Fri, Jun 10, 2016 at 8:15 PM, Doug Robinson <doug.robinson@wandisco.com> wrote:
The dichotomy is due to the expression of "knowing who is actually working on a file".

I agree that if locking is used then (assuming nobody breaks the lock) you know who will checkin next.  And, yes, agreed, when they check in is a social issue.

However, you really don't know who is working on the file.  This may all seem meta-physical but I've seen requirements for SCM systems where it really was necessary to know exactly who was actually working on the file in their sandbox.  None of the discussed SCMs here support those semantics.

On Mon, Jun 6, 2016 at 12:17 PM, Andreas Stieger <Andreas.Stieger@gmx.de> wrote:
Doug,
 
Doug Robinson wrote:
> To be more precise, you can know who, in the past, has made changes to files and
> checked those change into the repository.  You cannot know who has made changes
> in their working copy and has not yet checked them back into the repository (they
> may never do so). 

I am not sure why you would introduce this dichotomy here, it is irrelevant. OP asked for locking support. Subversion supports locking, lock hinting (svn:needs-lock), lock communication/discovery (display of who, when and why). In the cli, hooks and GUI clients. Whether or not actual changes were done in any working copy is irrelevant, and a delay in submission a mere social/project problem.

> To know who is actually working on a file requires a level of integration that is not
> found in SVN, Git or CVS.  I have a vague recollection of an SCM that did enable
> such information but I'm not remembering which one it is at the moment.

Rather, if the project policy is such that locking is required, it should be implemented accordingly. lock-modify-unlock for the whole project is a supported option, albeit not a commonly used one.

Andreas



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DOUGLAS B. ROBINSON SENIOR PRODUCT MANAGER




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