tests/containers.scm

   1 ;;; GNU Guix --- Functional package management for GNU
   2 ;;; Copyright © 2015 David Thompson <davet@gnu.org>
   3 ;;;
   4 ;;; This file is part of GNU Guix.
   5 ;;;
   6 ;;; GNU Guix is free software; you can redistribute it and/or modify it
   7 ;;; under the terms of the GNU General Public License as published by
   8 ;;; the Free Software Foundation; either version 3 of the License, or (at
   9 ;;; your option) any later version.
  10 ;;;
  11 ;;; GNU Guix is distributed in the hope that it will be useful, but
  12 ;;; WITHOUT ANY WARRANTY; without even the implied warranty of
  13 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 ;;; GNU General Public License for more details.
  15 ;;;
  16 ;;; You should have received a copy of the GNU General Public License
  17 ;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 (define-module (test-containers)
  20   #:use-module (guix utils)
  21   #:use-module (guix build syscalls)
  22   #:use-module (gnu build linux-container)
  23   #:use-module (srfi srfi-64)
  24   #:use-module (ice-9 match))
  25
  26 (define (assert-exit x)
  27   (primitive-exit (if x 0 1)))
  28
  29 ;; Skip these tests unless user namespaces are available and the setgroups
  30 ;; file (introduced in Linux 3.19 to address a security issue) exists.
  31 (unless (and (file-exists? "/proc/self/ns/user")
  32              (file-exists? "/proc/self/setgroups"))
  33   (exit 77))
  34
  35 (test-begin "containers")
  36
  37 (test-assert "call-with-container, exit with 0 when there is no error"
  38   (zero?
  39    (call-with-container '() (const #t) #:namespaces '(user))))
  40
  41 (test-assert "call-with-container, user namespace"
  42   (zero?
  43    (call-with-container '()
  44      (lambda ()
  45        ;; The user is root within the new user namespace.
  46        (assert-exit (and (zero? (getuid)) (zero? (getgid)))))
  47      #:namespaces '(user))))
  48
  49 (test-assert "call-with-container, uts namespace"
  50   (zero?
  51    (call-with-container '()
  52      (lambda ()
  53        ;; The user is root within the container and should be able to change
  54        ;; the hostname of that container.
  55        (sethostname "test-container")
  56        (primitive-exit 0))
  57      #:namespaces '(user uts))))
  58
  59 (test-assert "call-with-container, pid namespace"
  60   (zero?
  61    (call-with-container '()
  62      (lambda ()
  63        (match (primitive-fork)
  64          (0
  65           ;; The first forked process in the new pid namespace is pid 2.
  66           (assert-exit (= 2 (getpid))))
  67          (pid
  68           (primitive-exit
  69            (match (waitpid pid)
  70              ((_ . status)
  71               (status:exit-val status)))))))
  72      #:namespaces '(user pid))))
  73
  74 (test-assert "call-with-container, mnt namespace"
  75   (zero?
  76    (call-with-container '(("none" device "/testing" "tmpfs" () #f #f))
  77      (lambda ()
  78        (assert-exit (file-exists? "/testing")))
  79      #:namespaces '(user mnt))))
  80
  81 (test-assert "call-with-container, all namespaces"
  82   (zero?
  83    (call-with-container '()
  84      (lambda ()
  85        (primitive-exit 0)))))
  86
  87 (test-assert "container-excursion"
  88   (call-with-temporary-directory
  89    (lambda (root)
  90      ;; Two pipes: One for the container to signal that the test can begin,
  91      ;; and one for the parent to signal to the container that the test is
  92      ;; over.
  93      (match (list (pipe) (pipe))
  94        (((start-in . start-out) (end-in . end-out))
  95         (define (container)
  96           (close end-out)
  97           (close start-in)
  98           ;; Signal for the test to start.
  99           (write 'ready start-out)
 100           (close start-out)
 101           ;; Wait for test completion.
 102           (read end-in)
 103           (close end-in))
 104
 105         (define (namespaces pid)
 106           (let ((pid (number->string pid)))
 107             (map (lambda (ns)
 108                    (readlink (string-append "/proc/" pid "/ns/" ns)))
 109                  '("user" "ipc" "uts" "net" "pid" "mnt"))))
 110
 111         (let* ((pid (run-container root '() %namespaces 1 container))
 112                (container-namespaces (namespaces pid))
 113                (result
 114                 (begin
 115                   (close start-out)
 116                   ;; Wait for container to be ready.
 117                   (read start-in)
 118                   (close start-in)
 119                   (container-excursion pid
 120                     (lambda ()
 121                       ;; Fork again so that the pid is within the context of
 122                       ;; the joined pid namespace instead of the original pid
 123                       ;; namespace.
 124                       (match (primitive-fork)
 125                         (0
 126                          ;; Check that all of the namespace identifiers are
 127                          ;; the same as the container process.
 128                          (assert-exit
 129                           (equal? container-namespaces
 130                                   (namespaces (getpid)))))
 131                         (fork-pid
 132                          (match (waitpid fork-pid)
 133                            ((_ . status)
 134                             (primitive-exit
 135                              (status:exit-val status)))))))))))
 136           (close end-in)
 137           ;; Stop the container.
 138           (write 'done end-out)
 139           (close end-out)
 140           (waitpid pid)
 141           (zero? result)))))))
 142
 143 (test-end)
 144
 145 \f
 146 (exit (= (test-runner-fail-count (test-runner-current)) 0))