Megatest

                          (ok-flag
                           (let ((res (system cmd)))
                             (cond
                              ((eq? 0 res)
                               #t)
                              (else
                               (set! ok-flag #f)
                               (debug:print 0 *default-log-port* "ERROR: ["(common:human-time)"] Command failed with exit code "
                                            (if (< res 0)
                                                res
                                                (/ res 8)) " ["cmd"]" )
                               #f))))
                          (else
                           (debug:print 0 *default-log-port* "ERROR: ["(common:human-time)"] Not runnining command due to prior error. ["cmd"]")
                           #f))))
             (copy     (lambda (src dest) (docmd (conc "/bin/cp '"src"' '"dest"'"))))
             (copy+zip (lambda (src dest) (docmd (conc "gzip -c - < '"src"' > '"dest"'"))))
             (fullpath (realpath filepath))
             (basedir  (pathname-directory fullpath))
             (basefile (pathname-strip-directory fullpath))
             ;;(prevfile (conc filepath ".prev.gz"))

;;     (and ohh srv)))
    ;; (debug:print-info 0 *default-log-port* "common:run-sync? ohh=" ohh ", srv=" srv)



(define *wdnum* 0)
(define *wdnum*mutex (make-mutex))


(define (common:human-time)
  (time->string (seconds->local-time (current-seconds)) "%Y-%m-%d %H:%M:%S"))


;; currently the primary job of the watchdog is to run the sync back to megatest.db from the db in /tmp
;; if we are on the homehost and we are a server (by definition we are on the homehost if we are a server)
;;


(define (common:readonly-watchdog dbstruct)
  (thread-sleep! 0.05) ;; delay for startup
  (debug:print-info 13 *default-log-port* "common:readonly-watchdog entered.")
  ;; sync megatest.db to /tmp/.../megatst.db
  (let* ((sync-cool-off-duration   3)
        (golden-mtdb     (dbr:dbstruct-mtdb dbstruct))
        (golden-mtpath   (db:dbdat-get-path golden-mtdb))

	   ;; first look in config, then look in file .homehost, create it if not found
	   (homehost (or (configf:lookup *configdat* "server" "homehost" )
			 (handle-exceptions
			     exn
			     (if (> trynum 0)
				 (let ((delay-time (* (- 5 trynum) 5)))
				   (mutex-unlock! *homehost-mutex*)
				   (debug:print 0 *default-log-port* "ERROR: ["(common:human-time)"] Failed to read .homehost file, delaying " delay-time " seconds and trying again, message: "  ((condition-property-accessor 'exn 'message) exn))
				   (thread-sleep! delay-time)
				   (common:get-homehost trynum: (- trynum 1)))
				 (begin
				   (mutex-unlock! *homehost-mutex*)
				   (debug:print 0 *default-log-port* "ERROR: ["(common:human-time)"] Failed to read .homehost file after trying five times. Giving up and exiting, message: "  ((condition-property-accessor 'exn 'message) exn))
				   (exit 1)))
			   (let ((hhf (conc *toppath* "/.homehost")))
			     (if (common:file-exists? hhf)
				 (with-input-from-file hhf read-line)
				 (if (file-write-access? *toppath*)
				     (begin
				       (with-output-to-file hhf

	    (if all-good
		(let ((cmddat (make-qitem
			       command:   command
			       host-port: host-port
			       params:    params)))
		  (queue-push cmddat) 		;; put request into the queue
		  (nn-send soc "queued"))         ;; reply with "queued"
		(print "ERROR: ["(common:human-time)"] BAD request " dat))
	    (loop (nn-recv soc)))))
    (nn-close soc)))
  


;;======================================================================
;; D A S H B O A R D   U S E R   V I E W S

	 (lockfile     (conc tmp-db ".lock"))
         (sync-cmd     (conc sqlite-exe" " tmp-db " .dump | "sqlite-exe" " staging-file "&>"sync-log))
	 (min-intersync-delay (configf:lookup-number *configdat* "server" "minimum-intersync-delay" default: 30)))
    (if (and (not (args:get-arg "-sync-to-megatest.db")) ;; conditions under which we do not run the sync
	     (args:get-arg "-server"))
	(let loop ()
	  (thread-sleep! min-intersync-delay)
	  (if (common:simple-file-lock lockfile)
	      (begin
                
                (if (not (configf:lookup *configdat* "server" "disable-db-snapshot"))
                    (common:snapshot-file mtdbfile subdir: ".db-snapshot"))
		(delete-file* staging-file)
		(let ((start-time (current-milliseconds))
                      (res (system sync-cmd)))
                  (cond
                   ((eq? 0 res)
		    (delete-file* (conc mtdbfile ".backup"))
		    (system (conc "/bin/mv " staging-file " " mtdbfile))
                    (debug:print 1 *default-log-port* "INFO: ["(common:human-time)"] SYNC took "(/ (- (current-milliseconds) start-time))" sec")
                    #t)
                   (else
                    (system (conc "/bin/cp "sync-log" "sync-log".fail"))
                    (debug:print 0 *default-log-port* "ERROR: ["(common:human-time)"] Sync failed. See log at "sync-log".fail")
                    (if (file-exists? (conc mtdbfile ".backup"))
                        (system (conc "/bin/cp "mtdbfile ".backup " mtdbfile)))))
                  (common:simple-file-release-lock lockfile)))
              ;; else
              (debug:print 1 *default-log-port* "INFO: ["(common:human-time)"] other sync in progres; not syncing.")
              ) ;; end if got lockfile
	  
	  ;; keep going unless time to exit
	  ;;
	  (if (not *time-to-exit*)
	      (let delay-loop ((count 0))
		;;(debug:print-info 13 *default-log-port* "delay-loop top; count="count" pid="(current-process-id)" this-wd-num="this-wd-num" *time-to-exit*="*time-to-exit*)