;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2019, 2021 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix 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.
;;;
;;; GNU Guix 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 GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (gnu tests singularity)
  #:use-module (gnu tests)
  #:use-module (gnu system)
  #:use-module (gnu system vm)
  #:use-module (gnu system shadow)
  #:use-module (gnu services)
  #:use-module (gnu services docker)
  #:use-module (gnu packages bash)
  #:use-module (gnu packages guile)
  #:use-module (gnu packages linux)               ;singularity
  #:use-module (guix gexp)
  #:use-module (guix store)
  #:use-module (guix grafts)
  #:use-module (guix monads)
  #:use-module (guix packages)
  #:use-module (guix profiles)
  #:use-module (guix scripts pack)
  #:export (%test-singularity))

(define %singularity-os
  (simple-operating-system
   (service singularity-service-type)
   (simple-service 'guest-account
                   account-service-type
                   (list (user-account (name "guest") (uid 1000) (group "guest"))
                         (user-group (name "guest") (id 1000))))))

(define (run-singularity-test image)
  "Load IMAGE, a Squashfs image, as a Singularity image and run it inside
%SINGULARITY-OS."
  (define os
    (marionette-operating-system %singularity-os))

  (define singularity-exec
    #~(begin
        (use-modules (ice-9 popen) (rnrs io ports))

        (let* ((pipe (open-pipe* OPEN_READ
                                 #$(file-append singularity
                                                "/bin/singularity")
                                 "exec" #$image "/bin/guile"
                                 "-c" "(display \"hello, world\")"))
               (str  (get-string-all pipe))
               (status (close-pipe pipe)))
          (and (zero? status)
               (string=? str "hello, world")))))

  (define test
    (with-imported-modules '((gnu build marionette))
      #~(begin
          (use-modules (srfi srfi-11) (srfi srfi-64)
                       (gnu build marionette))

          (define marionette
            (make-marionette (list #$(virtual-machine os))))

          (test-runner-current (system-test-runner #$output))
          (test-begin "singularity")

          (test-assert "singularity exec /bin/guile (as root)"
            (marionette-eval '#$singularity-exec
                             marionette))

          (test-equal "singularity exec /bin/guile (unprivileged)"
            0
            (marionette-eval
             `(begin
                (use-modules (ice-9 match))

                (match (primitive-fork)
                  (0
                   (dynamic-wind
                     (const #f)
                     (lambda ()
                       (setgid 1000)
                       (setuid 1000)
                       (execl #$(program-file "singularity-exec-test"
                                              #~(exit #$singularity-exec))