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