Perforce and `p4 diff2' against the origin

Mike Meyer mwm at
Mon Apr 7 16:43:03 UTC 2008

On Mon, 7 Apr 2008 10:39:07 -0400 John Baldwin <jhb at> wrote:

> On Saturday 05 April 2008 10:50:38 am Ed Schouten wrote:
> > Hello everyone,
> >
> > Because my mpsafetty project in Perforce is going quite well, I'm
> > considering running some kind of cron job to generate nightly diffs, so
> > other people (interested friends, colleagues and others) to test my
> > work.
> >
> > I've read `p4 help diff2' and it seems you can run the following
> > command:
> >
> > 	p4 diff2 -b mpsafetty
> >
> > Unfortunately this command just does a braindead diff against the latest
> > FreeBSD vendor source, which is not useful in my case. I just want it to
> > generate a diff against the version I integrated.
> >
> > Is it possible to do this with Perforce?
> Then you can use p4 changes on your branch and find the last IFC and use that 
> diff like so:
> p4 diff2 -u -b mybranch @12345 #head
> I have a script to look in p4 changes of the branch to find the last IFC 
> commit and figure out the '12345' part automatically like so:

Perforce has facilities designed specifically to support this kind of
thing - counters and the "review" command. You can find a brief
description plus a link to the perforce-standard review daemon here:

It's designed to send email to perforce user.

Actually, something similar ought to be running on the repository
already. If so, and you're not using it, you can 'cheat' by setting up
the mail list you want and pointing your p4 user Email field at that,
along with the appropriate Reviews setting for yourself.


Mike Meyer <mwm at>
Independent Network/Unix/Perforce consultant, email for more information.

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