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+;;; ravanan --- High-reproducibility CWL runner powered by Guix
+;;; Copyright © 2025 Arun Isaac <arunisaac@systemreboot.net>
+;;;
+;;; This file is part of ravanan.
+;;;
+;;; ravanan is free software: you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation, either version 3 of the License, or
+;;; (at your option) any later version.
+;;;
+;;; ravanan is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;;; General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with ravanan.  If not, see <https://www.gnu.org/licenses/>.
+
+(define-module (ravanan single-machine)
+  #:use-module (srfi srfi-26)
+  #:use-module (ice-9 match)
+  #:export (submit-job))
+
+(define (submit-job environment stdout-file stderr-file script)
+  "Submit job running @var{script} to the single machine batch system.
+@var{environment} is an association list of environment variables to set in the
+job. @var{stdout-file} and @var{stderr-file} are files in which to write the
+stdout and stderr of the job respectively. Return @code{#t} if job succeeded,
+else @code{#f}."
+  (for-each (match-lambda
+              ((name . value)
+               (setenv name value)))
+            environment)
+  (format (current-error-port)
+          "Running ~a~%"
+          script)
+  (zero? (with-output-to-file stdout-file
+           (lambda ()
+             (with-error-to-file stderr-file
+               (cut system* script))))))