e748183538
* gnu/build/linux-container.scm (mount-file-systems): Add 'chmod' call.
* tests/containers.scm
("call-with-container, mnt namespace, root permissions"): New test.
309 lines
11 KiB
Scheme
309 lines
11 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2015 David Thompson <davet@gnu.org>
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;;; Copyright © 2016, 2017, 2019 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (test-containers)
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#:use-module (guix utils)
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#:use-module (guix build syscalls)
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#:use-module (gnu build linux-container)
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#:use-module ((gnu system linux-container)
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#:select (eval/container))
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#:use-module (gnu system file-systems)
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#:use-module (guix store)
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#:use-module (guix monads)
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#:use-module (guix gexp)
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#:use-module (guix derivations)
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#:use-module (guix tests)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-64)
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#:use-module (ice-9 match))
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(define (assert-exit x)
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(primitive-exit (if x 0 1)))
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(test-begin "containers")
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;; Skip these tests unless user namespaces are available and the setgroups
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;; file (introduced in Linux 3.19 to address a security issue) exists.
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(define (skip-if-unsupported)
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(unless (and (user-namespace-supported?)
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(unprivileged-user-namespace-supported?)
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(setgroups-supported?))
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(test-skip 1)))
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(skip-if-unsupported)
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(test-assert "call-with-container, exit with 0 when there is no error"
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(zero?
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(call-with-container '() (const #t) #:namespaces '(user))))
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(skip-if-unsupported)
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(test-assert "call-with-container, user namespace"
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(zero?
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(call-with-container '()
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(lambda ()
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;; The user is root within the new user namespace.
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(assert-exit (and (zero? (getuid)) (zero? (getgid)))))
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#:namespaces '(user))))
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(skip-if-unsupported)
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(test-assert "call-with-container, user namespace, guest UID/GID"
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(zero?
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(call-with-container '()
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(lambda ()
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(assert-exit (and (= 42 (getuid)) (= 77 (getgid)))))
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#:guest-uid 42
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#:guest-gid 77
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#:namespaces '(user))))
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(skip-if-unsupported)
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(test-assert "call-with-container, uts namespace"
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(zero?
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(call-with-container '()
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(lambda ()
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;; The user is root within the container and should be able to change
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;; the hostname of that container.
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(sethostname "test-container")
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(primitive-exit 0))
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#:namespaces '(user uts))))
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(skip-if-unsupported)
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(test-assert "call-with-container, pid namespace"
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(zero?
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(call-with-container '()
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(lambda ()
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(match (primitive-fork)
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(0
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;; The first forked process in the new pid namespace is pid 2.
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(assert-exit (= 2 (getpid))))
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(pid
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(primitive-exit
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(match (waitpid pid)
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((_ . status)
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(status:exit-val status)))))))
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#:namespaces '(user pid))))
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(skip-if-unsupported)
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(test-assert "call-with-container, mnt namespace"
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(zero?
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(call-with-container (list (file-system
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(device "none")
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(mount-point "/testing")
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(type "tmpfs")
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(check? #f)))
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(lambda ()
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(assert-exit (file-exists? "/testing")))
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#:namespaces '(user mnt))))
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(skip-if-unsupported)
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(test-equal "call-with-container, mnt namespace, wrong bind mount"
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`(system-error ,ENOENT)
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;; An exception should be raised; see <http://bugs.gnu.org/23306>.
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(catch 'system-error
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(lambda ()
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(call-with-container (list (file-system
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(device "/does-not-exist")
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(mount-point "/foo")
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(type "none")
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(flags '(bind-mount))
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(check? #f)))
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(const #t)
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#:namespaces '(user mnt)))
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(lambda args
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(list 'system-error (system-error-errno args)))))
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(skip-if-unsupported)
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(test-assert "call-with-container, all namespaces"
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(zero?
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(call-with-container '()
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(lambda ()
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(primitive-exit 0)))))
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(skip-if-unsupported)
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(test-assert "call-with-container, mnt namespace, root permissions"
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(zero?
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(call-with-container '()
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(lambda ()
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(assert-exit (= #o755 (stat:perms (lstat "/")))))
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#:namespaces '(user mnt))))
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(skip-if-unsupported)
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(test-assert "container-excursion"
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(call-with-temporary-directory
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(lambda (root)
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;; Two pipes: One for the container to signal that the test can begin,
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;; and one for the parent to signal to the container that the test is
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;; over.
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(match (list (pipe) (pipe))
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(((start-in . start-out) (end-in . end-out))
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(define (container)
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(close end-out)
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(close start-in)
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;; Signal for the test to start.
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(write 'ready start-out)
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(close start-out)
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;; Wait for test completion.
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(read end-in)
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(close end-in))
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(define (namespaces pid)
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(let ((pid (number->string pid)))
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(map (lambda (ns)
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(readlink (string-append "/proc/" pid "/ns/" ns)))
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'("user" "ipc" "uts" "net" "pid" "mnt"))))
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(let* ((pid (run-container root '() %namespaces 1 container))
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(container-namespaces (namespaces pid))
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(result
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(begin
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(close start-out)
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;; Wait for container to be ready.
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(read start-in)
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(close start-in)
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(container-excursion pid
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(lambda ()
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;; Fork again so that the pid is within the context of
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;; the joined pid namespace instead of the original pid
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;; namespace.
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(match (primitive-fork)
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(0
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;; Check that all of the namespace identifiers are
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;; the same as the container process.
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(assert-exit
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(equal? container-namespaces
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(namespaces (getpid)))))
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(fork-pid
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(match (waitpid fork-pid)
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((_ . status)
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(primitive-exit
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(status:exit-val status)))))))))))
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(close end-in)
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;; Stop the container.
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(write 'done end-out)
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(close end-out)
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(waitpid pid)
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(zero? result)))))))
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(skip-if-unsupported)
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(test-equal "container-excursion, same namespaces"
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42
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;; The parent and child are in the same namespaces. 'container-excursion'
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;; should notice that and avoid calling 'setns' since that would fail.
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(container-excursion (getpid)
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(lambda ()
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(primitive-exit 42))))
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(skip-if-unsupported)
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(test-assert "container-excursion*"
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(call-with-temporary-directory
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(lambda (root)
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(define (namespaces pid)
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(let ((pid (number->string pid)))
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(map (lambda (ns)
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(readlink (string-append "/proc/" pid "/ns/" ns)))
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'("user" "ipc" "uts" "net" "pid" "mnt"))))
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(let* ((pid (run-container root '()
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%namespaces 1
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(lambda ()
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(sleep 100))))
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(expected (namespaces pid))
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(result (container-excursion* pid
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(lambda ()
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(namespaces 1)))))
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(kill pid SIGKILL)
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(equal? result expected)))))
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(skip-if-unsupported)
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(test-equal "container-excursion*, same namespaces"
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42
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(container-excursion* (getpid)
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(lambda ()
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(* 6 7))))
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(skip-if-unsupported)
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(test-equal "eval/container, exit status"
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42
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(let* ((store (open-connection-for-tests))
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(status (run-with-store store
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(eval/container #~(exit 42)))))
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(close-connection store)
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(status:exit-val status)))
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(skip-if-unsupported)
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(test-assert "eval/container, writable user mapping"
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(call-with-temporary-directory
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(lambda (directory)
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(define store
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(open-connection-for-tests))
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(define result
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(string-append directory "/r"))
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(define requisites*
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(store-lift requisites))
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(call-with-output-file result (const #t))
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(run-with-store store
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(mlet %store-monad ((status (eval/container
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#~(begin
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(use-modules (ice-9 ftw))
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(call-with-output-file "/result"
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(lambda (port)
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(write (scandir #$(%store-prefix))
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port))))
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#:mappings
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(list (file-system-mapping
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(source result)
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(target "/result")
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(writable? #t)))))
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(reqs (requisites*
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(list (derivation->output-path
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(%guile-for-build))))))
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(close-connection store)
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(return (and (zero? (pk 'status status))
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(lset= string=? (cons* "." ".." (map basename reqs))
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(pk (call-with-input-file result read))))))))))
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(skip-if-unsupported)
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(test-assert "eval/container, non-empty load path"
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(call-with-temporary-directory
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(lambda (directory)
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(define store
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(open-connection-for-tests))
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(define result
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(string-append directory "/r"))
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(define requisites*
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(store-lift requisites))
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(mkdir result)
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(run-with-store store
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(mlet %store-monad ((status (eval/container
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(with-imported-modules '((guix build utils))
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#~(begin
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(use-modules (guix build utils))
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(mkdir-p "/result/a/b/c")))
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#:mappings
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(list (file-system-mapping
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(source result)
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(target "/result")
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(writable? #t))))))
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(close-connection store)
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(return (and (zero? status)
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(file-is-directory?
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(string-append result "/a/b/c")))))))))
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(test-end)
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