Jimmy Mitchener wrote on Wed, May 30, 2007 at 09:51:02AM -0800:

quoted text
> Is there a reason snapshots do not currently come with a
> src/sys.tar.gz as releases do? I would think this to be quite useful
> for people wishing/requiring building their own kernels, and using
> snapshots, as it would help to minimize damage from kernel/userland
> (and packages) coming out of sync.
> 
> I'm sure there's a good reason for them not being included, but I'm
> just curious as to what it is, I was unable to find anything in the
> archives.

http://www.openbsd.org/faq/faq5.html#Flavors

:: It is sometimes asked if there is any way to get a copy of exactly
:: the code used to build a snapshot.  The answer is no.  First, there
:: is no significant benefit to this.  Second, the snapshots are built
:: as desired, as time permits, and as resources become available.
:: On fast platforms, several snapshots may be released in one day.
:: On slower platforms, it may take a week or more to build a snapshot.
:: Providing tags or markers in the source tree for each snapshot would
:: be quite impractical.

Besides, snapshots often contain uncommitted tweaks, so a cvs tag
would not even do the job for you.