Allow customising the maximum number of processes

scripts/guix-data-service-process-jobs.in

@@ -30,8 +30,36 @@
 (setvbuf (current-output-port) 'line)
 (setvbuf (current-error-port) 'line)
 
-(with-postgresql-connection
- "process-jobs"
- (lambda (conn)
-   (simple-format #t "Ready to process jobs...\n")
-   (process-jobs conn)))
+(define %options
+  ;; Specifications of the command-line options
+  (list (option '("max-processes") #t #f
+                (lambda (opt name arg result)
+                  (alist-cons 'max-processes
+                              (string->number arg)
+                              result)))))
+
+(define %default-options
+  ;; Alist of default option values
+  `((max-processes ,default-max-processes)))
+
+(define (parse-options args)
+  (args-fold
+   args %options
+   (lambda (opt name arg result)
+     (error "unrecognized option" name))
+   (lambda (arg result)
+     (alist-cons
+      'revision-commits
+      (cons arg
+            (or (assoc-ref result 'revision-commits)
+                '()))
+      (alist-delete 'revision-commits result)))
+   %default-options))
+
+(let ((opts (parse-options (cdr (program-arguments)))))
+  (with-postgresql-connection
+   "process-jobs"
+   (lambda (conn)
+     (simple-format #t "Ready to process jobs...\n")
+     (process-jobs conn
+                   #:max-processes (assq-ref opts 'max-processes)))))