Megatest

	       (test-name (assoc/default 'test-name cmdinfo))
	       (runscript (assoc/default 'runscript cmdinfo))
	       (ezsteps   (assoc/default 'ezsteps   cmdinfo))
	       (db-host   (assoc/default 'db-host   cmdinfo))
	       (run-id    (assoc/default 'run-id    cmdinfo))
	       (itemdat   (assoc/default 'itemdat   cmdinfo))
	       (env-ovrd  (assoc/default 'env-ovrd  cmdinfo))
	       (set-vars  (assoc/default 'set-vars  cmdinfo)) ;; pre-overrides from -setvar
	       (runname   (assoc/default 'runname   cmdinfo))
	       (megatest  (assoc/default 'megatest  cmdinfo))
	       (mt-bindir-path (assoc/default 'mt-bindir-path cmdinfo))
	       (fullrunscript (if runscript (conc testpath "/" runscript) #f))
	       (db        #f))
	  (debug:print 2 "Exectuing " test-name " on " (get-host-name))
	  (change-directory testpath)
	  ;; apply pre-overrides before other variables. The pre-override vars must not
	  ;; clobbers things from the official sources such as megatest.config and runconfigs.config
	  (if (string? set-vars)
	      (let ((varpairs (string-split set-vars ",")))
		(debug:print 4 "varpairs: " varpairs)
		(map (lambda (varpair)
		       (let ((varval (string-split varpair "=")))
			 (if (eq? (length varval) 2)
			     (let ((var (car varval))
				   (val (cadr varval)))
			       (debug:print 1 "Adding pre-var/val " var " = " val " to the environment")
			       (setenv var val)))))
		     varpairs)))
	  (setenv "MT_TEST_RUN_DIR" work-area)
	  (setenv "MT_TEST_NAME" test-name)
	  (setenv "MT_ITEM_INFO" (conc itemdat))
	  (setenv "MT_RUNNAME"   runname)
	  (setenv "MT_MEGATEST"  megatest)
	  (if mt-bindir-path (setenv "PATH" (conc (getenv "PATH") ":" mt-bindir-path)))
	  

;; 1. look though disks list for disk with most space
;; 2. create run dir on disk, path name is meaningful
;; 3. create link from run dir to megatest runs area 
;; 4. remotely run the test on allocated host
;;    - could be ssh to host from hosts table (update regularly with load)
;;    - could be netbatch
;;      (launch-test db (cadr status) test-conf))
(define (launch-test db run-id runname test-conf keyvallst test-name test-path itemdat params)
  (change-directory *toppath*)
  (let ((useshell   (config-lookup *configdat* "jobtools"     "useshell"))
	(launcher   (config-lookup *configdat* "jobtools"     "launcher"))
	(runscript  (config-lookup test-conf   "setup"        "runscript"))
	(ezsteps    (> (length (hash-table-ref/default test-conf "ezsteps" '())) 0)) ;; don't send all the steps, could be big
	(diskspace  (config-lookup test-conf   "requirements" "diskspace"))
	(memory     (config-lookup test-conf   "requirements" "memory"))

    ;; set up the run work area for this test
    (set! diskpath (get-best-disk *configdat*))
    (if diskpath
	(let ((dat  (create-work-area db run-id test-path diskpath test-name itemdat)))
	  (set! work-area (car dat))
	  (set! toptest-work-area (cadr dat)))
	(begin
	  (set! work-area (conc test-path "/tmp_run"))
	  (create-directory work-area #t)
	  (debug:print 0 "WARNING: No disk work area specified - running in the test directory under tmp_run")))
    (set! cmdparms (base64:base64-encode (with-output-to-string
				    (lambda () ;; (list 'hosts     hosts)
				      (write (list (list 'testpath  test-path)
						   (list 'work-area work-area)
						   (list 'test-name test-name) 
						   (list 'runscript runscript) 
						   (list 'run-id    run-id   )
						   (list 'itemdat   itemdat  )
						   (list 'megatest  remote-megatest)
						   (list 'ezsteps   ezsteps) 
 						   (list 'env-ovrd  (hash-table-ref/default *configdat* "env-override" '())) 
						   (list 'set-vars  (if params (hash-table-ref/default params "-setvars" #f)))
						   (list 'runname   runname)
						   (list 'mt-bindir-path mt-bindir-path))))))) ;; (string-intersperse keyvallst " "))))
    ;; clean out step records from previous run if they exist
    (db:delete-test-step-records db run-id test-name itemdat)
    (change-directory work-area) ;; so that log files from the launch process don't clutter the test dir
    (cond
     ((and launcher hosts) ;; must be using ssh hostname