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+;;; kaakaa --- Tiny, security-focused AI agent in Guile
+;;; Copyright © 2026 Arun Isaac <arunisaac@systemreboot.net>
+;;;
+;;; This file is part of kaakaa.
+;;;
+;;; kaakaa 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.
+;;;
+;;; kaakaa 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 kaakaa.  If not, see <https://www.gnu.org/licenses/>.
+
+(define-module (kaakaa container)
+  #:use-module (rnrs io ports)
+  #:use-module (ice-9 match)
+  #:use-module (gnu build linux-container)
+  #:use-module (guix utils)
+  #:use-module (kaakaa records)
+  #:export (call-with-container*))
+
+(define-public-record-type* (<container-result> container-result container-result?)
+  (fields (output container-result-output)
+          (exit-value container-result-exit-value)))
+
+(define (call-with-container* mounts namespaces thunk)
+  "Run @var{thunk} as a process in a container with @var{mounts} and
+@var{namespaces}, and return a @code{<container-result>} object."
+  (call-with-temporary-directory
+   (lambda (root)
+     (match (pipe)
+       ((in . out)
+        (match (waitpid (run-container root mounts namespaces 1
+                                       (lambda ()
+                                         (close-port in)
+                                         (with-output-to-port out
+                                           ;; TODO: Capture stderr too.
+                                           thunk)
+                                         (close-port out))))
+          ((_ . status)
+           (close-port out)
+           (let ((result (get-string-all in)))
+             (close-port in)
+             (container-result result
+                               (status:exit-val status))))))))))