;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2016, 2017, 2020, 2021 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2016 John Darrington <jmd@gnu.org>
;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
;;; Copyright © 2017 Tobias Geerinckx-Rice <me@tobias.gr>
;;; Copyright © 2018 Clément Lassieur <clement@lassieur.org>
;;; Copyright © 2019, 2020 Ricardo Wurmus <rekado@elephly.net>
;;;
;;; 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 nfs)
  #:use-module (gnu tests)
  #:use-module (gnu bootloader)
  #:use-module (gnu bootloader grub)
  #:use-module (gnu system)
  #:use-module (gnu system file-systems)
  #:use-module (gnu system shadow)
  #:use-module (gnu system vm)
  #:use-module (gnu services)
  #:use-module (gnu services base)
  #:use-module (gnu services nfs)
  #:use-module (gnu services networking)
  #:use-module (gnu packages admin)
  #:use-module (gnu packages onc-rpc)
  #:use-module (gnu packages nfs)
  #:use-module (guix gexp)
  #:use-module (guix store)
  #:use-module (guix monads)
  #:export (%test-nfs
            %test-nfs-server
            %test-nfs-full))

(define %base-os
  (operating-system
    (host-name "olitupmok")
    (timezone "Europe/Berlin")
    (locale "en_US.UTF-8")

    (bootloader (bootloader-configuration
                 (bootloader grub-bootloader)
                 (targets '("/dev/sdX"))))
    (file-systems %base-file-systems)
    (users %base-user-accounts)
    (packages (cons*
               rpcbind
               %base-packages))
    (services (cons*
               (service rpcbind-service-type)
               (service dhcp-client-service-type)
               %base-services))))

(define (run-nfs-test name socket)
  "Run a test of an OS running RPC-SERVICE, which should create SOCKET."
  (define os
    (marionette-operating-system
     %base-os
     #:imported-modules '((gnu services herd)
                          (guix combinators))))

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

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

          (define (wait-for-socket file)
            ;; Wait until SOCKET  exists in the guest
            (marionette-eval
             `(let loop ((i 10))
                (cond ((and (file-exists? ,file)
                            (eq? 'socket (stat:type (stat ,file))))
                       #t)
                      ((> i 0)
                       (sleep 1)
                       (loop (- i 1)))
                      (else
                       (error "Socket didn't show up: " ,file))))
             marionette))

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

          ;; Wait for the rpcbind daemon to be up and running.
          (test-assert "RPC service running"
            (marionette-eval
             '(begin
                (use-modules (gnu services herd))

                ;; Ensure 'rpcinfo' can be found below.
                (setenv "PATH" "/run/current-system/profile/bin")

                (start-service 'rpcbind-daemon))
             marionette))

          ;; Check the socket file and that the service is still running.
          (test-assert "RPC socket exists"
            (and
             (wait-for-socket #$socket)
             (marionette-eval
              '(begin
                 (use-modules (gnu services herd)
                              (srfi srfi-1))

                 (live-service-running
                  (find (lambda (live)
                          (memq 'rpcbind-daemon
                                (live-service-provision live)))
                        (current-services))))
              marionette)))

          (test-assert "Probe RPC daemon"
            (marionette-eval
             '(zero? (system* "rpcinfo" "-p"))
             marionette))

          (test-end))))

  (gexp->derivation name test))

(define %test-nfs
  (system-test
   (name "nfs")
   (description "Test some things related to NFS.")
   (value (run-nfs-test name "/var/run/rpcbind.sock"))))


(define %nfs-os
  (let ((os (simple-operating-system
             (simple-service 'create-target-directory activation-service-type
                             #~(begin
                                 (mkdir "/remote")
                                 (chmod "/remote" #o777)
                                 #t))
             (service dhcp-client-service-type)
             (service nfs-service-type
                      (nfs-configuration
                       (debug '(nfs nfsd mountd))
                       (exports '(("/export"
                                   ;; crossmnt = This is the pseudo root.
                                   ;; fsid=0 = root file system of the export
                                   "*(ro,insecure,no_subtree_check,crossmnt,fsid=0)"))))))))
    (operating-system
      (inherit os)
      (host-name "nfs-server")
      ;; We need to use a tmpfs here, because the test system's root file
      ;; system cannot be re-exported via NFS.
      (file-systems (cons
                     (file-system
                       (device "none")
                       (mount-point "/export")
                       (type "tmpfs")
                       (create-mount-point? #t))
                     %base-file-systems))
      (services
       ;; Enable debugging output.
       (modify-services (operating-system-user-services os)
         (syslog-service-type config
                              =>
                              (syslog-configuration
                               (inherit config)
                               (config-file
                                (plain-file
                                 "syslog.conf"
                                 "*.* /dev/console\n")))))))))

(define (run-nfs-server-test)
  "Run a test of an OS running a service of NFS-SERVICE-TYPE."
  (define os
    (marionette-operating-system
     %nfs-os
     #:requirements '(nscd)
     #:imported-modules '((gnu services herd)
                          (guix combinators))))
  (define test
    (with-imported-modules '((gnu build marionette))
      #~(begin
          (use-modules (gnu build marionette)
                       (srfi srfi-64))

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

          (test-runner-current (system-test-runner #$output))
          (test-begin "nfs-daemon")
          (marionette-eval
           '(begin
              (current-output-port
               (open-file "/dev/console" "w0"))
              (chmod "/export" #o777)
              (with-output-to-file "/export/hello"
                (lambda () (display "hello world")))
              (chmod "/export/hello" #o777))
           marionette)

          (test-assert "nscd PID file is created"
            (marionette-eval
             '(begin
                (use-modules (gnu services herd))
                (start-service 'nscd))
             marionette))

          (test-assert "nscd is listening on its socket"
            (wait-for-unix-socket "/var/run/nscd/socket"
                                  marionette))

          (test-assert "network is up"
            (marionette-eval
             '(begin
                (use-modules (gnu services herd))
                (start-service 'networking))
             marionette))

          ;; Wait for the NFS services to be up and running.
          (test-assert "nfs services are running"
            (and (marionette-eval
                  '(begin
                     (use-modules (gnu services herd))
                     (start-service 'nfs))
                  marionette)
                 (wait-for-file "/var/run/rpc.statd.pid" marionette)))

          (test-assert "nfs share is advertised"
            (marionette-eval
             '(zero? (system* (string-append #$nfs-utils "/sbin/showmount")
                              "-e" "nfs-server"))
             marionette))

          (test-assert "nfs share mounted"
            (marionette-eval
             '(begin
                (and (zero? (system* (string-append #$nfs-utils "/sbin/mount.nfs4")
                                     "nfs-server:/" "/remote" "-v"))
                     (file-exists? "/remote/hello")))
             marionette))
          (test-end))))

  (gexp->derivation "nfs-server-test" test))

(define %test-nfs-server
  (system-test
   (name "nfs-server")
   (description "Test that an NFS server can be started and exported
directories can be mounted.")
   (value (run-nfs-server-test))))


(define (run-nfs-full-test)
  "Run a test of an OS mounting its root file system via NFS."
  (define nfs-root-server-os
    (let ((os (simple-operating-system)))
      (marionette-operating-system
       (operating-system
         (inherit os)
         (services
          (cons*
           (service static-networking-service-type
                    (list
                     (static-networking
                      (addresses (list (network-address
                                        (device "ens5")
                                        (value "10.0.2.15/24")))))))
           (simple-service 'export activation-service-type
                           #~(begin
                               (mkdir-p "/export")
                               (chmod "/export" #o777)))
           (service nfs-service-type
                    (nfs-configuration
                     (nfsd-port 2049)
                     (nfs-versions '("4.2"))
                     (exports '(("/export"
                                 "*(rw,insecure,no_subtree_check,\
crossmnt,fsid=root,no_root_squash,insecure,async)")))))
           (modify-services (operating-system-user-services os)
             (syslog-service-type config
                                  =>
                                  (syslog-configuration
                                   (inherit config)
                                   (config-file
                                    (plain-file
                                     "syslog.conf"
                                     "*.* /dev/console\n"))))))))
       #:requirements '(nscd)
       #:imported-modules '((gnu services herd)
                            (guix combinators)))))

  (define nfs-root-client-os
    (marionette-operating-system
     (simple-operating-system
      (service static-networking-service-type
               (list
                (static-networking
                 (addresses
                  (list (network-address
                         (device "ens5")
                         (value "10.0.2.16/24")))))))
      (service nfs-service-type
               (nfs-configuration
                (nfsd-port 2049)
                (nfs-versions '("4.2"))))
      (simple-service 'export activation-service-type
                      #~(begin
                          (mkdir-p "/export")
                          (chmod "/export" #o777))))
     #:requirements '(nscd)
     #:imported-modules '((gnu services herd)
                          (guix combinators))))

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

          (test-runner-current (system-test-runner #$output))
          (test-begin "start-nfs-boot-test")

          ;;; Start up NFS server host.
          (mkdir "/tmp/server")
          (define server-marionette
            (make-marionette
             (cons* #$(virtual-machine
                       (operating-system nfs-root-server-os)
                       (volatile? #f))
                    '("-device" "e1000,netdev=n1,mac=52:54:00:12:34:56"
                      "-netdev" "socket,id=n1,listen=:1234"))
             #:socket-directory "/tmp/server"))

          ;;; Wait for the NFS services to be up and running.
          (test-assert "nfs services are running"
            (wait-for-file "/var/run/rpc.statd.pid" server-marionette))

          (test-assert "NFS port is ready"
            (wait-for-tcp-port 2049 server-marionette))

          ;;; Start up NFS client host.
          (mkdir "/tmp/client")
          (define client-marionette
            (make-marionette
             (cons* #$(virtual-machine
                       (operating-system nfs-root-client-os)
                       (volatile? #f))
                    '("-device" "e1000,netdev=n2,mac=52:54:00:12:34:57"
                      "-netdev" "socket,id=n2,connect=127.0.0.1:1234"))
             #:socket-directory "/tmp/client"))

          (test-assert "NFS port is ready"
            (wait-for-tcp-port 2049 client-marionette))

          (marionette-eval
           '(begin
              (use-modules (rnrs io ports))
              (current-output-port
               (open-file "/dev/console" "w0"))
              (and
               (system* (string-append #$nfs-utils "/sbin/mount.nfs")
                        "10.0.2.15:/export" "/export" "-v")
               (let ((content (call-with-input-file "/proc/mounts"
                                get-string-all)))
                 (call-with-output-file "/export/mounts"
                   (lambda (port)
                     (display content port))))))
           client-marionette)

          ;;; Check whether NFS client host communicated with NFS server host.
          (test-assert "nfs client deposited file"
            (wait-for-file "/export/mounts" server-marionette))

          (marionette-eval
           '(begin
              (current-output-port
               (open-file "/dev/console" "w0"))
              (call-with-input-file "/export/mounts" display))
           server-marionette)

          (test-end))))

  (gexp->derivation "nfs-full-test" test))

(define %test-nfs-full
  (system-test
   (name "nfs-full")
   (description "Test that an NFS server can be started and the exported
directory can be used by another machine.")
   (value (run-nfs-full-test))))