Megatest

	     (runname  (or (args:get-arg "-runname")
			   (args:get-arg ":runname")
			   (getenv "MT_RUNNAME")))
	     (fulldir  (conc linktree "/"
			     target "/"
			     runname)))
	(debug:print-info 0 "Have -runtests with target=" target ", runname=" runname ", fulldir=" fulldir ", testpatt=" (or (args:get-arg "-testpatt") "%"))
	(if (file-exists? linktree) ;; can't proceed without linktree
	    (begin
	      (if (not (file-exists? fulldir))
		  (create-directory fulldir #t)) ;; need to protect with exception handler 
	      (if (and target
		       runname
		       (file-exists? fulldir))
		  (let ((tmpfile  (conc fulldir "/.megatest.cfg." (current-seconds)))

	 (linktree (common:get-linktree))
	 (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 (file-exists? rundir)(file-write-access? rundir))))
    ;; (print "runname: " runname " target: " target " mtcachef: " mtcachef " rccachef: " rccachef)
    ;; (if (not *toppath*)(set! *toppath* toppath)) ;; this probably is not needed?
    (cond
     ;; data was read and cached and available in *configstatus*, toppath has already been set
     ((eq? *configstatus* 'fulldata)
      *toppath*)
     ;; if mtcachef exists just read it, however we need to assume toppath is available in $MT_RUN_AREA_HOME
     ((and mtcachef (file-exists? mtcachef) (get-environment-variable "MT_RUN_AREA_HOME"))
      (set! *configdat*    (configf:read-alist mtcachef))
      (set! *runconfigdat* (configf:read-alist rccachef))
      (set! *configinfo*   (list *configdat*  (get-environment-variable "MT_RUN_AREA_HOME")))
      (set! *configstatus* 'fulldata)
      (set! *toppath*      (get-environment-variable "MT_RUN_AREA_HOME"))
      *toppath*)
     ;; we have all the info needed to fully process runconfigs and megatest.config
     (mtcachef              
      (let* ((toppath    (get-environment-variable "MT_RUN_AREA_HOME")) ;; rely on MT_RUN_AREA_HOME if we are in a test environment
	     (sections   (list "default" target)) ;; for runconfigs
	     (first-pass (find-and-read-config        ;; NB// sets MT_RUN_AREA_HOME as side effect
				  mtconfig
				  environ-patt: "env-override"
				  given-toppath: toppath
				  pathenvvar: "MT_RUN_AREA_HOME"))
	     (first-rundat  (read-config (conc toppath "/runconfigs.config") *runconfigdat* #t 
					 sections: sections)))