MySQL not being started via SMF

Question

I compiled my own MySQL 5.0.41 and have it installed in /opt/mysql and everything works fine. I hunted around and found a manifest and startup script here http://www.sun.com/bigadmin/content/submitted/mysql_smf_tip.html and it never starts MySQL, it just stays in a persistent maintenance state.
This is a shiny new Solaris 10 installation, so there isn't much in the way of other software outside of the complete installation package (minus OEM). Looking at the error log I find this:
[ May 20 09:33:45 Executing start method ("/lib/svc/method/svc-mysql start") ]
svc.startd could not set context for method: chdir: No such file or directory
[ May 20 09:33:45 Method "start" exited with status 96 ]
If I run the svc-mysql from the above link myself MySQL starts as expected, so I suspect the problem lies in some of the dependencies, but I'm not terribly sure which one(s) I can axe.
Any ideas?

Answer 1

Now I'm confused. I have exactly the same problem - but with a binary installation of coolstack so its nothing to do with "compile your own"
I thought the purpose of <method_context> was to set up an environment from within which the methods can be called. In this case I was interpreting this as run "/lib/svc/method/svc-mysql start" as user "mysql" which is surely what we want to do.
Now I'm not clear. Does <method_credential> set up an environment for running the method or specify a set of constraints as to who can run the method.
Incidently I've trawled the man pages looking for a definition of <method_context> <method_credential ..... > NO Joy 8-{