Megatest

	    (set-signal-handler! signal/stop sighand))
	  
	  ;; (set-signal-handler! signal/int (lambda ()
					    
	  ;; Do not run the test if it is REMOVING, RUNNING, KILLREQ or REMOTEHOSTSTART,
	  ;; Mark the test as REMOTEHOSTSTART *IMMEDIATELY*
	  ;;
	  (let* ((test-info (rmt:get-testinfo-state-status run-id test-id))
		 (test-host (db:test-get-host       test-info))
		 (test-pid  (db:test-get-process_id test-info)))
	    (cond
	     ((member (db:test-get-state test-info) '("INCOMPLETE" "KILLED" "UNKNOWN" "KILLREQ" "STUCK")) ;; prior run of this test didn't complete, go ahead and try to rerun
	      (debug:print 0 "INFO: test is INCOMPLETE or KILLED, treat this execute call as a rerun request")
	      (tests:test-force-state-status! run-id test-id "REMOTEHOSTSTART" "n/a")) ;; prime it for running
	     ((member (db:test-get-state test-info) '("RUNNING" "REMOTEHOSTSTART"))
	      (if (process-alive-on-host? test-host test-pid)
		  (debug:print 0 "ERROR: test state is "  (db:test-get-state test-info) " and process " test-pid " is still running on host " test-host ", cannot proceed")
		  (tests:test-force-state-status! run-id test-id "REMOTEHOSTSTART" "n/a")))
	     ((not (member (db:test-get-state test-info) '("REMOVING" "REMOTEHOSTSTART" "RUNNING" "KILLREQ")))
	      (tests:test-force-state-status! run-id test-id "REMOTEHOSTSTART" "n/a"))
	     (else ;; (member (db:test-get-state test-info) '("REMOVING" "REMOTEHOSTSTART" "RUNNING" "KILLREQ"))
	      (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 force: #t))
	      (begin
		(debug:print 0 "Failed to setup, exiting") 
		;; (sqlite3:finalize! db)
		;; (sqlite3:finalize! tdb)
		(exit 1)))
	  (change-directory *toppath*) 

					     (tests:get-testconfig test-name tconfigreg #t force-create: #t)) ;; 'return-procs)))
					    (ezstepslst (if (hash-table? testconfig)
							    (hash-table-ref/default testconfig "ezsteps" '())
							    #f)))
				       (if testconfig
					   (hash-table-set! *testconfigs* test-name testconfig) ;; cached for lazy reads later ...
					   (begin



					     (launch:setup)

					     (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))

	      (tests:summarize-test run-id test-id)  ;; don't force - just update if no
	      (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)))))))

(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")
	       (args:get-arg "-execute")))
      (let* ((linktree (get-environment-variable "MT_LINKTREE"))
	     (target   (common:args-get-target))
	     (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 (and linktree (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))
			(rconfig  (conc fulldir "/.runconfig." megatest-version "-" megatest-fossil-hash)))
		    (if (file-exists? rconfig) ;; only cache megatest.config AFTER runconfigs has been cached
			(begin
			  (debug:print-info 0 "Caching megatest.config in " fulldir "/.megatest.cfg")
			  (configf:write-alist *configdat* tmpfile)
			  (system (conc "ln -sf " tmpfile " " targfile))))
		    )))))))

;; set up the very basics needed for doing anything here.
;;
(define (launch:setup-old #!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
      (begin
	(set! *configinfo* (or (if (get-environment-variable "MT_CMDINFO") ;; we are inside a test - do not reprocess configs

	      (setenv "MT_RUN_AREA_HOME" *toppath*)
	      (begin
		(debug:print 0 "ERROR: failed to find the top path to your Megatest area.")
		(exit 1)))
	  )))
  *toppath*)


































;; gather available information, if legit read configs in this order:
;;
;;   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)
;;           *runconfigdat* (runconfigs.config info)
;;           *configstatus* (status of the read data)
;;
(define (launch:setup-new #!key (force #f))
  (let* ((toppath  (or *toppath* (getenv "MT_RUN_AREA_HOME"))) ;; preserve toppath
	 (runname  (common:args-get-runname))
	 (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 (file-exists? rundir)(file-write-access? rundir))))
    ;; (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
    (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* ((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)))
	(set! *runconfigdat* first-rundat)
	(if first-pass  ;; 
	    (begin
	      (set! *configdat*  (car first-pass))
	      (set! *configinfo* first-pass)
	      (set! *toppath*    (or toppath (cadr first-pass))) ;; use the gathered data unless already have it
	      (set! toppath      *toppath*)
	      (setenv "MT_RUN_AREA_HOME" *toppath*)
	      ;; 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     (keys:target->keyval keys target))
		     (linktree     (or (getenv "MT_LINKTREE")
				       (if *configdat* (configf:lookup *configdat* "setup" "linktree") #f)))
		     (second-pass  (find-and-read-config
				    mtconfig
				    environ-patt: "env-override"
				    given-toppath: toppath
				    pathenvvar: "MT_RUN_AREA_HOME"))
		     (runconfigdat (begin     ;; this read of the runconfigs will see any adjustments made by re-reading megatest.config
				     (for-each (lambda (kt)
						 (setenv (car kt) (cadr kt)))
					       key-vals)
				     (read-config (conc toppath "/runconfigs.config") *runconfigdat* #t 
						  sections: sections))))
		(if cancreate (configf:write-alist runconfigdat rccachef))
		(set! *runconfigdat* runconfigdat)
		(if cancreate (configf:write-alist *configdat* mtcachef))
		(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")))
	(if cfgdat
	    (let* ((toppath  (or (get-environment-variable "MT_RUN_AREA_HOME")(cadr cfgdat)))
		   (rdat     (read-config (conc toppath
						"/runconfigs.config") *runconfigdat* #t sections: sections)))
	      (set! *configinfo*   cfgdat)
	      (set! *configdat*    (car cfgdat))
	      (set! *runconfigdat* rdat)
	      (set! *toppath*      toppath)
	      (set! *configstatus* 'partial))
	    (begin
	      (debug:print 0 "ERROR: No " mtconfig " file found. Giving up.")
	      (exit 2))))))
    ;; additional house keeping
    (let* ((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 (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.")))
    *toppath*))

(define launch:setup launch:setup-new)

(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