summaryrefslogtreecommitdiff
path: root/tests/syscalls.scm
blob: 1b31d87f230ac3696b725c6d70139055c141c05c (about) (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2015 David Thompson <davet@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 (test-syscalls)
  #:use-module (guix utils)
  #:use-module (guix build syscalls)
  #:use-module (gnu build linux-container)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-26)
  #:use-module (srfi srfi-64)
  #:use-module (ice-9 match))

;; Test the (guix build syscalls) module, although there's not much that can
;; actually be tested without being root.

(define temp-file
  (string-append "t-utils-" (number->string (getpid))))


(test-begin "syscalls")

(test-equal "mount, ENOENT"
  ENOENT
  (catch 'system-error
    (lambda ()
      (mount "/dev/null" "/does-not-exist" "ext2")
      #f)
    (compose system-error-errno list)))

(test-assert "umount, ENOENT/EPERM"
  (catch 'system-error
    (lambda ()
      (umount "/does-not-exist")
      #f)
    (lambda args
      ;; Both return values have been encountered in the wild.
      (memv (system-error-errno args) (list EPERM ENOENT)))))

(test-assert "mount-points"
  ;; Reportedly "/" is not always listed as a mount point, so check a few
  ;; others (see <http://bugs.gnu.org/20261>.)
  (any (cute member <> (mount-points))
       '("/" "/proc" "/sys" "/dev")))

(test-assert "swapon, ENOENT/EPERM"
  (catch 'system-error
    (lambda ()
      (swapon "/does-not-exist")
      #f)
    (lambda args
      (memv (system-error-errno args) (list EPERM ENOENT)))))

(test-assert "swapoff, ENOENT/EINVAL/EPERM"
  (catch 'system-error
    (lambda ()
      (swapoff "/does-not-exist")
      #f)
    (lambda args
      (memv (system-error-errno args) (list EPERM EINVAL ENOENT)))))

(test-assert "mkdtemp!"
  (let* ((tmp (or (getenv "TMPDIR") "/tmp"))
         (dir (mkdtemp! (string-append tmp "/guix-test-XXXXXX"))))
    (and (file-exists? dir)
         (begin
           (rmdir dir)
           #t))))

(test-equal "statfs, ENOENT"
  ENOENT
  (catch 'system-error
    (lambda ()
      (statfs "/does-not-exist"))
    (compose system-error-errno list)))

(test-assert "statfs"
  (let ((fs (statfs "/")))
    (and (file-system? fs)
         (> (file-system-block-size fs) 0)
         (>= (file-system-blocks-available fs) 0)
         (>= (file-system-blocks-free fs)
             (file-system-blocks-available fs)))))

(define (user-namespace pid)
  (string-append "/proc/" (number->string pid) "/ns/user"))

(define perform-container-tests?
  (and (user-namespace-supported?)
       (unprivileged-user-namespace-supported?)))

(unless perform-container-tests?
  (test-skip 1))
(test-assert "clone"
  (match (clone (logior CLONE_NEWUSER SIGCHLD))
    (0 (primitive-exit 42))
    (pid
     ;; Check if user namespaces are different.
     (and (not (equal? (readlink (user-namespace pid))
                       (readlink (user-namespace (getpid)))))
          (match (waitpid pid)
            ((_ . status)
             (= 42 (status:exit-val status))))))))

(unless perform-container-tests?
  (test-skip 1))
(test-assert "setns"
  (match (clone (logior CLONE_NEWUSER SIGCHLD))
    (0 (primitive-exit 0))
    (clone-pid
     (match (pipe)
       ((in . out)
        (match (primitive-fork)
          (0
           (close in)
           ;; Join the user namespace.
           (call-with-input-file (user-namespace clone-pid)
             (lambda (port)
               (setns (port->fdes port) 0)))
           (write 'done out)
           (close out)
           (primitive-exit 0))
          (fork-pid
           (close out)
           ;; Wait for the child process to join the namespace.
           (read in)
           (let ((result (and (equal? (readlink (user-namespace clone-pid))
                                      (readlink (user-namespace fork-pid))))))
             ;; Clean up.
             (waitpid clone-pid)
             (waitpid fork-pid)
             result))))))))

(unless perform-container-tests?
  (test-skip 1))
(test-equal "pivot-root"
  #t
  (match (pipe)
    ((in . out)
     (match (clone (logior CLONE_NEWUSER CLONE_NEWNS SIGCHLD))
       (0
        (dynamic-wind
          (const #t)
          (lambda ()
            (close in)
            (call-with-temporary-directory
             (lambda (root)
               (let ((put-old (string-append root "/real-root")))
                 (mount "none" root "tmpfs")
                 (mkdir put-old)
                 (call-with-output-file (string-append root "/test")
                   (lambda (port)
                     (display "testing\n" port)))
                 (pivot-root root put-old)
                 ;; The test file should now be located inside the root directory.
                 (write (file-exists? "/test") out)
                 (close out)))))
          (lambda ()
            (primitive-exit 0))))
       (pid
        (close out)
        (let ((result (read in)))
          (close in)
          (and (zero? (match (waitpid pid)
                        ((_ . status)
                         (status:exit-val status))))
               (eq? #t result))))))))

(false-if-exception (delete-file temp-file))
(test-equal "fcntl-flock wait"
  42                                              ; the child's exit status
  (let ((file (open-file temp-file "w0b")))
    ;; Acquire an exclusive lock.
    (fcntl-flock file 'write-lock)
    (match (primitive-fork)
      (0
       (dynamic-wind
         (const #t)
         (lambda ()
           ;; Reopen FILE read-only so we can have a read lock.
           (let ((file (open-file temp-file "r0b")))
             ;; Wait until we can acquire the lock.
             (fcntl-flock file 'read-lock)
             (primitive-exit (read file)))
           (primitive-exit 1))
         (lambda ()
           (primitive-exit 2))))
      (pid
       ;; Write garbage and wait.
       (display "hello, world!"  file)
       (force-output file)
       (sleep 1)

       ;; Write the real answer.
       (seek file 0 SEEK_SET)
       (truncate-file file 0)
       (write 42 file)
       (force-output file)

       ;; Unlock, which should let the child continue.
       (fcntl-flock file 'unlock)

       (match (waitpid pid)
         ((_  . status)
          (let ((result (status:exit-val status)))
            (close-port file)
            result)))))))

(test-equal "fcntl-flock non-blocking"
  EAGAIN                                          ; the child's exit status
  (match (pipe)
    ((input . output)
     (match (primitive-fork)
       (0
        (dynamic-wind
          (const #t)
          (lambda ()
            (close-port output)

            ;; Wait for the green light.
            (read-char input)

            ;; Open FILE read-only so we can have a read lock.
            (let ((file (open-file temp-file "w0")))
              (catch 'flock-error
                (lambda ()
                  ;; This attempt should throw EAGAIN.
                  (fcntl-flock file 'write-lock #:wait? #f))
                (lambda (key errno)
                  (primitive-exit (pk 'errno errno)))))
            (primitive-exit -1))
          (lambda ()
            (primitive-exit -2))))
       (pid
        (close-port input)
        (let ((file (open-file temp-file "w0")))
          ;; Acquire an exclusive lock.
          (fcntl-flock file 'write-lock)

          ;; Tell the child to continue.
          (write 'green-light output)
          (force-output output)

          (match (waitpid pid)
            ((_  . status)
             (let ((result (status:exit-val status)))
               (fcntl-flock file 'unlock)
               (close-port file)
               result)))))))))

(test-assert "all-network-interface-names"
  (match (all-network-interface-names)
    (((? string? names) ..1)
     (member "lo" names))))

(test-assert "network-interface-names"
  (match (network-interface-names)
    (((? string? names) ..1)
     (lset<= string=? names (all-network-interface-names)))))

(test-assert "network-interface-flags"
  (let* ((sock  (socket AF_INET SOCK_STREAM 0))
         (flags (network-interface-flags sock "lo")))
    (close-port sock)
    (and (not (zero? (logand flags IFF_LOOPBACK)))
         (not (zero? (logand flags IFF_UP))))))

(test-equal "loopback-network-interface?"
  ENODEV
  (and (loopback-network-interface? "lo")
       (catch 'system-error
         (lambda ()
           (loopback-network-interface? "nonexistent")
           #f)
         (lambda args
           (system-error-errno args)))))

(test-skip (if (zero? (getuid)) 1 0))
(test-assert "set-network-interface-flags"
  (let ((sock (socket AF_INET SOCK_STREAM 0)))
    (catch 'system-error
      (lambda ()
        (set-network-interface-flags sock "lo" IFF_UP))
      (lambda args
        (close-port sock)
        ;; We get EPERM with Linux 3.18ish and EACCES with 2.6.32.
        (memv (system-error-errno args) (list EPERM EACCES))))))

(test-equal "network-interface-address lo"
  (make-socket-address AF_INET (inet-pton AF_INET "127.0.0.1") 0)
  (let* ((sock (socket AF_INET SOCK_STREAM 0))
         (addr (network-interface-address sock "lo")))
    (close-port sock)
    addr))

(test-skip (if (zero? (getuid)) 1 0))
(test-assert "set-network-interface-address"
  (let ((sock (socket AF_INET SOCK_STREAM 0)))
    (catch 'system-error
      (lambda ()
        (set-network-interface-address sock "nonexistent"
                                       (make-socket-address
                                        AF_INET
                                        (inet-pton AF_INET "127.12.14.15")
                                        0)))
      (lambda args
        (close-port sock)
        ;; We get EPERM with Linux 3.18ish and EACCES with 2.6.32.
        (memv (system-error-errno args) (list EPERM EACCES))))))

(test-equal "network-interfaces returns one or more interfaces"
  '(#t #t #t)
  (match (network-interfaces)
    ((interfaces ..1)
     (list (every interface? interfaces)
           (every string? (map interface-name interfaces))
           (every (lambda (sockaddr)
                    ;; Sometimes interfaces have no associated address.
                    (or (vector? sockaddr)
                        (not sockaddr)))
                  (map interface-address interfaces))))))

(test-equal "network-interfaces returns \"lo\""
  (list #t (make-socket-address AF_INET (inet-pton AF_INET "127.0.0.1") 0))
  (match (filter (lambda (interface)
                   (string=? "lo" (interface-name interface)))
                 (network-interfaces))
    ((loopbacks ..1)
     (list (every (lambda (lo)
                    (not (zero? (logand IFF_LOOPBACK (interface-flags lo)))))
                  loopbacks)
           (match (find (lambda (lo)
                          (= AF_INET (sockaddr:fam (interface-address lo))))
                        loopbacks)
             (#f #f)
             (lo (interface-address lo)))))))

(test-equal "tcgetattr ENOTTY"
  ENOTTY
  (catch 'system-error
    (lambda ()
      (call-with-input-file "/dev/null"
        (lambda (port)
          (tcgetattr (fileno port)))))
    (compose system-error-errno list)))

(test-skip (if (and (file-exists? "/proc/self/fd/0")
                    (string-prefix? "/dev/pts/" (readlink "/proc/self/fd/0")))
               0
               2))

(test-assert "tcgetattr"
  (let ((termios (tcgetattr 0)))
    (and (termios? termios)
         (> (termios-input-speed termios) 0)
         (> (termios-output-speed termios) 0))))

(test-assert "tcsetattr"
  (let ((first (tcgetattr 0)))
    (tcsetattr 0 (tcsetattr-action TCSANOW) first)
    (equal? first (tcgetattr 0))))

(test-assert "terminal-window-size ENOTTY"
  (call-with-input-file "/dev/null"
    (lambda (port)
      (catch 'system-error
        (lambda ()
          (terminal-window-size port))
        (lambda args
          ;; Accept EINVAL, which some old Linux versions might return.
          (memv (system-error-errno args)
                (list ENOTTY EINVAL)))))))

(test-assert "terminal-columns"
  (> (terminal-columns) 0))

(test-assert "terminal-columns non-file port"
  (> (terminal-columns (open-input-string "Join us now, share the software!"))
     0))

(test-end)

(false-if-exception (delete-file temp-file))