src/test/test-clock.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   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 "tmpfile-util.h"
  16
  17 static void test_clock_is_localtime(void) {
  18         _cleanup_(unlink_tempfilep) char adjtime[] = "/tmp/test-adjtime.XXXXXX";
  19         _cleanup_fclose_ FILE* f = NULL;
  20
  21         static const struct scenario {
  22                 const char* contents;
  23                 int expected_result;
  24         } scenarios[] = {
  25                 /* adjtime configures UTC */
  26                 {"0.0 0 0\n0\nUTC\n", 0},
  27                 /* adjtime configures local time */
  28                 {"0.0 0 0\n0\nLOCAL\n", 1},
  29                 /* no final EOL */
  30                 {"0.0 0 0\n0\nUTC", 0},
  31                 {"0.0 0 0\n0\nLOCAL", 1},
  32                 /* empty value -> defaults to UTC */
  33                 {"0.0 0 0\n0\n", 0},
  34                 /* unknown value -> defaults to UTC */
  35                 {"0.0 0 0\n0\nFOO\n", 0},
  36                 /* no third line */
  37                 {"0.0 0 0", 0},
  38                 {"0.0 0 0\n", 0},
  39                 {"0.0 0 0\n0", 0},
  40         };
  41
  42         /* without an adjtime file we default to UTC */
  43         assert_se(clock_is_localtime("/nonexisting/adjtime") == 0);
  44
  45         assert_se(fmkostemp_safe(adjtime, "w", &f) == 0);
  46         log_info("adjtime test file: %s", adjtime);
  47
  48         for (size_t i = 0; i < ELEMENTSOF(scenarios); ++i) {
  49                 log_info("scenario #%zu:, expected result %i", i, scenarios[i].expected_result);
  50                 log_info("%s", scenarios[i].contents);
  51                 rewind(f);
  52                 ftruncate(fileno(f), 0);
  53                 assert_se(write_string_stream(f, scenarios[i].contents, WRITE_STRING_FILE_AVOID_NEWLINE) == 0);
  54                 assert_se(clock_is_localtime(adjtime) == scenarios[i].expected_result);
  55         }
  56 }
  57
  58 /* Test with the real /etc/adjtime */
  59 static void test_clock_is_localtime_system(void) {
  60         int r;
  61         r = clock_is_localtime(NULL);
  62
  63         if (access("/etc/adjtime", R_OK) == 0) {
  64                 log_info("/etc/adjtime is readable, clock_is_localtime() == %i", r);
  65                 /* if /etc/adjtime exists we expect some answer, no error or
  66                  * crash */
  67                 assert_se(IN_SET(r, 0, 1));
  68         } else
  69                 /* default is UTC if there is no /etc/adjtime */
  70                 assert_se(r == 0 || ERRNO_IS_PRIVILEGE(r));
  71 }
  72
  73 int main(int argc, char *argv[]) {
  74         test_clock_is_localtime();
  75         test_clock_is_localtime_system();
  76
  77         return 0;
  78 }