src/test/test-clock.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2 /***
   3   Copyright © 2016 Canonical Ltd.
   4 ***/
   5
   6 #include <unistd.h>
   7 #include <fcntl.h>
   8
   9 #include "clock-util.h"
  10 #include "fd-util.h"
  11 #include "fileio.h"
  12 #include "fs-util.h"
  13 #include "log.h"
  14 #include "macro.h"
  15 #include "tests.h"
  16 #include "tmpfile-util.h"
  17
  18 TEST(clock_is_localtime) {
  19         _cleanup_(unlink_tempfilep) char adjtime[] = "/tmp/test-adjtime.XXXXXX";
  20         _cleanup_fclose_ FILE* f = NULL;
  21
  22         static const struct scenario {
  23                 const char* contents;
  24                 int expected_result;
  25         } scenarios[] = {
  26                 /* adjtime configures UTC */
  27                 {"0.0 0 0\n0\nUTC\n", 0},
  28                 /* adjtime configures local time */
  29                 {"0.0 0 0\n0\nLOCAL\n", 1},
  30                 /* no final EOL */
  31                 {"0.0 0 0\n0\nUTC", 0},
  32                 {"0.0 0 0\n0\nLOCAL", 1},
  33                 /* empty value -> defaults to UTC */
  34                 {"0.0 0 0\n0\n", 0},
  35                 /* unknown value -> defaults to UTC */
  36                 {"0.0 0 0\n0\nFOO\n", 0},
  37                 /* no third line */
  38                 {"0.0 0 0", 0},
  39                 {"0.0 0 0\n", 0},
  40                 {"0.0 0 0\n0", 0},
  41         };
  42
  43         /* without an adjtime file we default to UTC */
  44         assert_se(clock_is_localtime("/nonexisting/adjtime") == 0);
  45
  46         assert_se(fmkostemp_safe(adjtime, "w", &f) == 0);
  47         log_info("adjtime test file: %s", adjtime);
  48
  49         for (size_t i = 0; i < ELEMENTSOF(scenarios); ++i) {
  50                 log_info("scenario #%zu:, expected result %i", i, scenarios[i].expected_result);
  51                 log_info("%s", scenarios[i].contents);
  52                 rewind(f);
  53                 assert_se(ftruncate(fileno(f), 0) == 0);
  54                 assert_se(write_string_stream(f, scenarios[i].contents, WRITE_STRING_FILE_AVOID_NEWLINE) == 0);
  55                 assert_se(clock_is_localtime(adjtime) == scenarios[i].expected_result);
  56         }
  57 }
  58
  59 /* Test with the real /etc/adjtime */
  60 TEST(clock_is_localtime_system) {
  61         int r;
  62         r = clock_is_localtime(NULL);
  63
  64         if (access("/etc/adjtime", R_OK) == 0) {
  65                 log_info("/etc/adjtime is readable, clock_is_localtime() == %i", r);
  66                 /* if /etc/adjtime exists we expect some answer, no error or
  67                  * crash */
  68                 assert_se(IN_SET(r, 0, 1));
  69         } else
  70                 /* default is UTC if there is no /etc/adjtime */
  71                 assert_se(r == 0 || ERRNO_IS_PRIVILEGE(r));
  72 }
  73
  74 DEFINE_TEST_MAIN(LOG_INFO);