Megatest

		  (debug:print 0 "INFO: Not starting job yet - directory " top-path " not found")
		  (thread-sleep! 10)
		  (loop (+ count 1)))))

	  (let ((sighand (lambda (signum)
			   ;; (signal-mask! signum) ;; to mask or not? seems to cause issues in exiting
			   (if (eq? signum signal/stop)
			 (debug:print 0 "ERROR: attempt to STOP process. Exiting."))
			       (debug:print 0 "ERROR: attempt to STOP process. Exiting."))
			   (set! *time-to-exit* #t)
			   (print "Received signal " signum ", cleaning up before exit. Please wait...")
			   (let ((th1 (make-thread (lambda ()
						     (tests:test-force-state-status! run-id test-id "INCOMPLETE" "KILLED")
						     (print "Killed by signal " signum ". Exiting")
						     (thread-sleep! 1)
						     (exit 1))))

	      (debug:print 0 "ERROR: test state is " (db:test-get-state test-info) ", cannot proceed")
	      (exit))))
	  
	  (debug:print 2 "Exectuing " test-name " (id: " test-id ") on " (get-host-name))
	  (set! keys       (rmt:get-keys))
	  ;; (runs:set-megatest-env-vars run-id inkeys: keys inkeyvals: keyvals) ;; these may be needed by the launching process
	  ;; one of these is defunct/redundant ...
	  (if (not (launch:setup-for-run force: #t))
	  (if (not (launch:setup force: #t))
	      (begin
		(debug:print 0 "Failed to setup, exiting") 
		;; (sqlite3:finalize! db)
		;; (sqlite3:finalize! tdb)
		(exit 1)))
	  (change-directory *toppath*) 

	  ;; NOTE: Current order is to process runconfigs *before* setting the MT_ vars. This 
	  ;;       seems non-ideal but could well break stuff
	  ;;    BUG? BUG? BUG?

	  
	  (let ((rconfig (full-runconfigs-read))) ;; (read-config (conc  *toppath* "/runconfigs.config") #f #t sections: (list "default" target))))
	    ;; (setup-env-defaults (conc *toppath* "/runconfigs.config") run-id (make-hash-table) keyvals target)
	    ;; (set-run-config-vars run-id keyvals target) ;; (db:get-target db run-id))
	    ;; Now have runconfigs data loaded, set environment vars
	    (for-each (lambda (section)
			(for-each (lambda (varval)
				    (let ((var (car varval))

				 ;; then, if runscript ran ok (or did not get called)
				 ;; do all the ezsteps (if any)
				 (if ezsteps
				     (let* ((testconfig ;; (read-config (conc work-area "/testconfig") #f #t environ-patt: "pre-launch-env-vars")) ;; FIXME??? is allow-system ok here?
					     ;; NOTE: it is tempting to turn off force-create of testconfig but dynamic
					     ;;       ezstep names need a full re-eval here.
					     (tests:get-testconfig test-name tconfigreg #t force-create: #t)) ;; 'return-procs)))
					    (ezstepslst (if (hash-table? testconfig)
					    (ezstepslst (hash-table-ref/default testconfig "ezsteps" '())))
				       (hash-table-set! *testconfigs* test-name testconfig) ;; cached for lazy reads later ...
							    (hash-table-ref/default testconfig "ezsteps" '())
							    #f)))
				       (if testconfig
					   (hash-table-set! *testconfigs* test-name testconfig) ;; cached for lazy reads later ...
					   (begin
					     ;; got here but there are race condiitions - re-do all setup and try one more time
					     (if (launch:setup)
						 (begin
						   (launch:cache-config)
						   (set! testconfig (full-runconfigs-read))) ;; redunantly redundant, but does it resolve the race?
					     (debug:print 0 "WARNING: no testconfig found for " test-name " in search path:\n  "
							  (string-intersperse (tests:get-tests-search-path *configdat*) "\n  ")))))
				       ;; after all that, still no testconfig? Time to abort
				       (if (not testconfig)
					   (begin
					     (debug:print 0 "ERROR: Failed to resolve megatest.config, runconfigs.config and testconfig issues. Giving up now")
					     (exit 1)))
				       (if (not (file-exists? ".ezsteps"))(create-directory ".ezsteps"))
				       ;; if ezsteps was defined then we are sure to have at least one step but check anyway
				       (if (not (> (length ezstepslst) 0))
					   (debug:print 0 "ERROR: ezsteps defined but ezstepslst is zero length")
					   (let loop ((ezstep (car ezstepslst))
						      (tal    (cdr ezstepslst))
						      (prevstep #f))

	      (rmt:update-run-stats run-id (rmt:get-raw-run-stats run-id)))
	    (mutex-unlock! m)
	    (debug:print 2 "Output from running " fullrunscript ", pid " (launch:einf-pid exit-info) " in work area " 
			 work-area ":\n====\n exit code " (launch:einf-exit-code exit-info) "\n" "====\n")
	    (if (not (launch:einf-exit-status exit-info))
		(exit 4)))))))

;; set up the very basics needed for doing anything here.
;; gather available information, if legit read configs in this order:
(define (launch:setup-for-run #!key (force #f))
  ;; would set values for KEYS in the environment here for better support of env-override but 
  ;; have chicken/egg scenario. need to read megatest.config then read it again. Going to 
  ;; pass on that idea for now
  ;; special case
  (if (or force (not (hash-table? *configdat*)))  ;; no need to re-open on every call
;;
;;   if have cache;
;;      read it a return it
;;   else
;;     megatest.config     (do not cache)
;;     runconfigs.config   (cache if all vars avail)
;;     megatest.config     (cache if all vars avail)
;;   returns:
;;     *toppath*
;;   side effects:
;;     sets; *configdat*    (megatest.config info)
      (begin
	(set! *configinfo* (or (if (get-environment-variable "MT_CMDINFO") ;; we are inside a test - do not reprocess configs
				   (let ((alistconfig (conc (get-environment-variable "MT_LINKTREE") "/"
							    (get-environment-variable "MT_TARGET")   "/"
;;           *runconfigdat* (runconfigs.config info)
;;           *configstatus* (status of the read data)
;;
(define (launch:setup #!key (force #f))
  (let* ((runname  (common:args-get-runname))
	 (target   (common:args-get-target))
	 (linktree (common:get-linktree))
							    (get-environment-variable "MT_RUNNAME")  "/"
							    ".megatest.cfg-"  megatest-version "-" megatest-fossil-hash)))
				     (if (file-exists? alistconfig)
					 (list (configf:read-alist alistconfig)
					       (get-environment-variable "MT_RUN_AREA_HOME"))
					 #f))
				   #f) ;; no config cached - give up
			       (let ((runname (or (args:get-arg "-runname")(args:get-arg ":runname"))))
				 (if runname (setenv "MT_RUNNAME" runname))
				 (find-and-read-config 
				  (if (args:get-arg "-config")(args:get-arg "-config") "megatest.config")
				  environ-patt: "env-override"
				  given-toppath: (get-environment-variable "MT_RUN_AREA_HOME")
				  pathenvvar: "MT_RUN_AREA_HOME"))))
	(set! *configdat*  (if (car *configinfo*)(car *configinfo*) #f))
	(set! *toppath*    (if (car *configinfo*)(cadr *configinfo*) #f))
	 (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)
    (cond
     ;; data was read and cached and available in *configstatus*
     ((eq? *configstatus* 'fulldata)
      *toppath*)
     ;; if mtcachef exists just read it
     ((and mtcachef (file-exists? mtcachef))
      (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)
      *toppath*)
     ;; we have all the info needed to fully process runconfigs and megatest.config
     (mtcachef              
      (let ((first-pass (find-and-read-config 
				  (or (args:get-arg "-config") "megatest.config")
				  environ-patt: "env-override"
				  given-toppath: (get-environment-variable "MT_RUN_AREA_HOME")
				  pathenvvar: "MT_RUN_AREA_HOME")))
	(if first-pass
	    (begin
	      (set! *configdat*  (car first-pass))
	      (set! *configinfo* first-pass)
	      (set! *toppath*    (cadr first-pass))
	      ;; the seed read is done, now read runconfigs, cache it then read megatest.config one more time and cache it
	      (let* ((keys     (rmt:get-keys))
		     (key-vals (if target (keys:target->keyval keys target) #f))
		     (sections (if target (list "default" target) #f)) ;; for runconfigs
		     (linktree (or (getenv "MT_LINKTREE")
				   (if *configdat* (configf:lookup *configdat* "setup" "linktree") #f)))
		     (runconfigdat (begin
				     (setenv "MT_RUN_AREA_HOME" *toppath*)
				     (if key-vals
					 (for-each (lambda (kt)
						     (setenv (car kt) (cadr kt)))
						   key-vals))
				     (read-config (conc *toppath* "/runconfigs.config") #f #t sections: sections))))
		(if cancreate (configf:write-alist runconfigdat rccachef))
		(set! *runconfigdat* runconfigdat)
		(let ((second-pass (find-and-read-config 
				    (or (args:get-arg "-config") "megatest.config")
				    environ-patt: "env-override"
				    given-toppath: (get-environment-variable "MT_RUN_AREA_HOME")
				    pathenvvar: "MT_RUN_AREA_HOME")))
		  (if cancreate (configf:write-alist (car second-pass) mtcachef))
		  (set! *configdat* (car second-pass))
		  (set! *toppath*   (cadr second-pass))
		  (if cancreate (set! *configstatus* 'fulldata)))))
	    ;; no configs found? should not happen but let's try to recover gracefully, return an empty hash-table
	    (set! *configdat* (make-hash-table))
	    )))
     ;; else read what you can and set the flag accordingly
     (else
      (let* ((cfgdat   (find-and-read-config 
			(or (args:get-arg "-config") "megatest.config")
			environ-patt: "env-override"
			given-toppath: (get-environment-variable "MT_RUN_AREA_HOME")
			pathenvvar: "MT_RUN_AREA_HOME"))
	     (sections (if target (list "default" target) #f))
	     (rdat     (read-config (conc (or *toppath* (get-environment-variable "MT_RUN_AREA_HOME")(cadr cfgdat))
					  "/runconfigs.config") #f #t sections: sections)))
	(set! *configinfo*   cfgdat)
	(set! *configdat*    (car cfgdat))
	(set! *runconfigdat* rdat)
	(set! *toppath*      (cadr cfgdat))
	(let* ((tmptransport (configf:lookup *configdat* "server" "transport"))
	       (transport    (if tmptransport (string->symbol tmptransport) 'http)))
	  (if (member transport '(http rpc nmsg))
	      (set! *transport-type* transport)
	      (begin
	(set! *configstatus* 'partial))))
    ;; final house keeping
		(debug:print 0 "ERROR: Unrecognised transport " transport)
		(exit))))
	(let ((linktree (configf:lookup *configdat* "setup" "linktree"))) ;; link tree is critical
	  (if linktree
	      (if (not (file-exists? linktree))
		  (begin
		    (handle-exceptions
		     exn
		     (begin
		       (debug:print 0 "ERROR: Something went wrong when trying to create linktree dir at " linktree)
		       (debug:print 0 " message: " ((condition-property-accessor 'exn 'message) exn))
		       (exit 1))
		     (create-directory linktree #t))))
	      (begin
		(debug:print 0 "ERROR: linktree not defined in [setup] section of megatest.config")
		(exit 1)))
    (let* ((keys     (rmt:get-keys))
	   (key-vals (if target (keys:target->keyval keys target) #f))
	   (sections (if target (list "default" target) #f)) ;; for runconfigs
	   (linktree (or (getenv "MT_LINKTREE")
			 (if *configdat* (configf:lookup *configdat* "setup" "linktree") #f))))
      (if linktree
	  (if (not (file-exists? linktree))
	      (begin
		(handle-exceptions
		 exn
		 (begin
		   (debug:print 0 "ERROR: Something went wrong when trying to create linktree dir at " linktree)
		   (debug:print 0 " message: " ((condition-property-accessor 'exn 'message) exn))
		   (exit 1))
		 (create-directory linktree #t))))
	  (begin
	    (debug:print 0 "ERROR: linktree not defined in [setup] section of megatest.config")
	    ;; (exit 1)
	  (if linktree
	      (let ((dbdir (conc linktree "/.db")))
		(handle-exceptions
		 exn
		 (begin
		   (debug:print 0 "ERROR: failed to create the " dbdir " area for your database files")
		   (debug:print 0 " message: " ((condition-property-accessor 'exn 'message) exn)))
		 (if (not (directory-exists? dbdir))(create-directory dbdir)))
		(setenv "MT_LINKTREE" linktree))
	      (begin
		(debug:print 0 "ERROR: linktree is required in your megatest.config [setup] section")
		(exit 1)))
	  (if (and *toppath*
		   (directory-exists? *toppath*))
	      (setenv "MT_RUN_AREA_HOME" *toppath*)
	      (begin
		(debug:print 0 "ERROR: failed to find the top path to your Megatest area.")
	    )))
    (if (and *toppath*
	     (directory-exists? *toppath*))
	(setenv "MT_RUN_AREA_HOME" *toppath*)
	(begin
	  (debug:print 0 "ERROR: failed to find the top path to your Megatest area.")))
		(exit 1)))
	  )))
  *toppath*)
    *toppath*))

(define (launch:cache-config)
  ;; if we have a linktree and -runtests and -target and the directory exists dump the config
  ;; to megatest-(current-seconds).cfg and symlink it to megatest.cfg
  (if (and *configdat* 
	   (or (args:get-arg "-run")
	       (args:get-arg "-runtests")))
      (let* ((linktree (get-environment-variable "MT_LINKTREE"))
	     (target   (common:args-get-target))
	     (runname  (or (args:get-arg "-runname")
			   (args:get-arg ":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)))
			(targfile (conc fulldir "/.megatest.cfg-"  megatest-version "-" megatest-fossil-hash)))
		    (debug:print-info 0 "Caching megatest.config in " fulldir "/.megatest.cfg")
		    (configf:write-alist *configdat* tmpfile)
		    (system (conc "ln -sf " tmpfile " " targfile))
		    )))))))

(define (get-best-disk confdat testconfig)
  (let* ((disks   (or (and testconfig (hash-table-ref/default testconfig "disks" #f))
		      (hash-table-ref/default confdat "disks" #f)))
	 (minspace (let ((m (configf:lookup confdat "setup" "minspace")))
		     (string->number (or m "10000")))))
    (if disks