[p4] Re: Labels or branches?

[Simon Morton]

This is certainly a bit confusing until you realize what is going on.
I was using a change daemon which was polling `p4 counter change` to 
figure out when something had changed.  It took me a while to realize
that the change counter didn't always change when a change list was
submitted.  For example:

Action                                  `p4 counter change`
user 1 submits change 50                        50
user 2 creates pending change list 51           51
user 3 creates pending change list 52           52
user 2 submits change list 51                   52  
user 3 submits change list 52                   52

If you are polling on `p4 counter change` to detect when a change list
is submitted, you will miss both 51 and 52.

You need to use `p4 changes -s submitted -m 1` and parse out the change 
number to find the last change list submitted.

Simon

> -----Original Message-----
> From: Tadd Ottman [mailto:tadd at docent.com]
> Sent: Thursday, June 07, 2001 8:35 PM
> To: Gordon Broom; perforce-user at perforce.com
> Subject: RE: [p4] Re: Labels or branches?
> 
> 
> 
> Gordon,
> 
> Your reply and others have forced me to rethink my experience, for I
> was burned by such a discrepancy recently when reconstructing an old
> build.   Now I have concluded that the old build was identified by
> a 'p4 counter change' value rather than the latest submitted 
> changelist
> value.  In this situation, the value might have been associated with
> a pending changelist that was submitted without a need for 
> renumbering.
> It is comforting to me to learn about the renumbering practice, but
> the case reinforces the importance of using the latest *submitted*
> changelist value to identify a build rather than using the current
> value of the change counter.
> 
> Tadd
> 
> > -----Original Message-----
> > From: Gordon Broom [mailto:Gordon_Broom at pml.com]
> > Sent: Thursday, June 07, 2001 5:05 PM
> > To: 'Tadd Ottman'; perforce-user at perforce.com
> > Subject: RE: [p4] Re: Labels or branches?
> > 
> > 
> > Thus spake Tadd Ottman:
> > 
> > >To clarify, this is *not* a problem with pending <default> 
> changelists,
> > >since they are assigned new changelist numbers greater 
> than that which
> > >identifies your build.  The problem is submittals of 
> changelists created
> > >with "p4 change" or the <Update> button in P4Win before 
> your build and
> > >submitted after your build.  When reconstructing your build in the
> > >future, your "p4 sync" will incorporate such changes even 
> though your
> > >original build did not.
> > 
> > Changelists created with 'p4 change' get renumbered when 
> submitted, if
> > another change has occurred in the meantime.  P4 will inform 
> > you when this
> > occurs.
> > 
> > Gord Broom
> > Configuration Management Engineer
> > Power Measurement Ltd.
> > http://www.pml.com/
> > +1 250 652 7100 x7608
> > 
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