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clock-util: be more tolerant in parsing /etc/adjtime

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As we default to "hardware clock is in UTC" if /etc/adjtime is not present, it
also makes sense to have that default if /etc/adjtime contains only one or two
lines.

Drop the "gibberish" test case, as this was just EIO because of not containing
three lines, which is already contained in other tests. clock_is_localtime()
never actually validated the format of the first two lines, and there is little
point in doing that.

This addresses the reading half of issue #2638.
This commit is contained in:
Martin Pitt 2016-02-26 12:33:41 +01:00
parent 6369641d6f
commit 35f7216f96
2 changed files with 12 additions and 8 deletions
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4
src/basic/clock-util.c
View file

@ -91,7 +91,8 @@ int clock_is_localtime(const char* adjtime_path) {
fgets(line, sizeof(line), f) &&
fgets(line, sizeof(line), f);
if (!b)
return -EIO;
/* less than three lines -> default to UTC */
return 0;
truncate_nl(line);
return streq(line, "LOCAL");
@ -99,6 +100,7 @@ int clock_is_localtime(const char* adjtime_path) {
} else if (errno != ENOENT)
return -errno;
/* adjtime not present -> default to UTC */
return 0;
}

16
src/test/test-clock.c
View file

@ -41,10 +41,14 @@ static void test_clock_is_localtime(void) {
/* no final EOL */
{"0.0 0 0\n0\nUTC", 0},
{"0.0 0 0\n0\nLOCAL", 1},
/* empty value -> defaults to UTC */
{"0.0 0 0\n0\n", 0},
/* unknown value -> defaults to UTC */
{"0.0 0 0\n0\nFOO\n", 0},
/* gibberish */
{"br0ken", -EIO},
/* no third line */
{"0.0 0 0", 0},
{"0.0 0 0\n", 0},
{"0.0 0 0\n0", 0},
};
/* without an adjtime file we default to UTC */
@ -75,11 +79,9 @@ static void test_clock_is_localtime_system(void) {
if (access("/etc/adjtime", F_OK) == 0) {
log_info("/etc/adjtime exists, clock_is_localtime() == %i", r);
/* we cannot assert much if /etc/adjtime exists, just that we
* expect either an answer, or an EIO if the local file really
* is badly malformed. I. e. we don't expect any other error
* code or crash. */
assert(r == 0 || r == 1 || r == -EIO);
/* if /etc/adjtime exists we expect some answer, no error or
* crash */
assert(r == 0 || r == 1);
} else
/* default is UTC if there is no /etc/adjtime */
assert(r == 0);