Megatest

	     (target   (common:args-get-target))
	     (linktree (common:get-linktree))
	     (sections (if target (list "default" target) #f)) ;; for runconfigs
	     (mtconfig (or (args:get-arg "-config") "megatest.config")) ;; allow overriding megatest.config 
	     (rundir   (if (and runname target linktree)(conc linktree "/" target "/" runname) #f))
	     (mtcachef (and rundir (conc rundir "/" ".megatest.cfg-"  megatest-version "-" megatest-fossil-hash)))
	     (rccachef (and rundir (conc rundir "/" ".runconfigs.cfg-"  megatest-version "-" megatest-fossil-hash)))
	     (cancreate (and rundir (common:file-exists? rundir)(file-write-access? rundir)))
	     (cxt       (hash-table-ref/default *contexts* toppath #f)))

	;; create our cxt for this area if it doesn't already exist
	(if (not cxt)(hash-table-set! *contexts* toppath (make-cxt)))

	;; (print "runname: " runname " target: " target " mtcachef: " mtcachef " rccachef: " rccachef)
	(set! *toppath* toppath) ;; This is needed when we are running as a test using CMDINFO as a datasource