diff --git a/.gitignore b/.gitignore
index eab660e..56a60ba 100644
--- a/.gitignore
+++ b/.gitignore
@@ -158,6 +158,7 @@
/test-cgroup
/test-cgroup-mask
/test-cgroup-util
+/test-clock
/test-compress
/test-compress-benchmark
/test-condition
diff --git a/Makefile.am b/Makefile.am
index 7bd98dd..4f9072c 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1448,6 +1448,7 @@ tests += \
test-prioq \
test-fileio \
test-time \
+ test-clock \
test-hashmap \
test-set \
test-bitmap \
@@ -1961,6 +1962,12 @@ test_time_SOURCES = \
test_time_LDADD = \
libshared.la
+test_clock_SOURCES = \
+ src/test/test-clock.c
+
+test_clock_LDADD = \
+ libshared.la
+
test_architecture_SOURCES = \
src/test/test-architecture.c
diff --git a/src/basic/clock-util.c b/src/basic/clock-util.c
index 507e757..7fe8d35 100644
--- a/src/basic/clock-util.c
+++ b/src/basic/clock-util.c
@@ -69,9 +69,12 @@ int clock_set_hwclock(const struct tm *tm) {
return 0;
}
-int clock_is_localtime(void) {
+int clock_is_localtime(const char* adjtime_path) {
_cleanup_fclose_ FILE *f;
+ if (adjtime_path == NULL)
+ adjtime_path = "/etc/adjtime";
+
/*
* The third line of adjtime is "UTC" or "LOCAL" or nothing.
* # /etc/adjtime
@@ -79,7 +82,7 @@ int clock_is_localtime(void) {
* 0
* UTC
*/
- f = fopen("/etc/adjtime", "re");
+ f = fopen(adjtime_path, "re");
if (f) {
char line[LINE_MAX];
bool b;
@@ -88,7 +91,8 @@ int clock_is_localtime(void) {
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");
@@ -96,6 +100,7 @@ int clock_is_localtime(void) {
} else if (errno != ENOENT)
return -errno;
+ /* adjtime not present -> default to UTC */
return 0;
}
diff --git a/src/basic/clock-util.h b/src/basic/clock-util.h
index f471f2a..8830cd2 100644
--- a/src/basic/clock-util.h
+++ b/src/basic/clock-util.h
@@ -21,7 +21,7 @@
#include <time.h>
-int clock_is_localtime(void);
+int clock_is_localtime(const char* adjtime_path);
int clock_set_timezone(int *min);
int clock_reset_timewarp(void);
int clock_get_hwclock(struct tm *tm);
diff --git a/src/core/dbus-manager.c b/src/core/dbus-manager.c
index f939196..00372b9 100644
--- a/src/core/dbus-manager.c
+++ b/src/core/dbus-manager.c
@@ -139,7 +139,7 @@ static int property_get_tainted(
if (access("/proc/cgroups", F_OK) < 0)
e = stpcpy(e, "cgroups-missing:");
- if (clock_is_localtime() > 0)
+ if (clock_is_localtime(NULL) > 0)
e = stpcpy(e, "local-hwclock:");
/* remove the last ':' */
diff --git a/src/core/main.c b/src/core/main.c
index b4e96fd..2c31593 100644
--- a/src/core/main.c
+++ b/src/core/main.c
@@ -1375,7 +1375,7 @@ int main(int argc, char *argv[]) {
}
if (!skip_setup) {
- if (clock_is_localtime() > 0) {
+ if (clock_is_localtime(NULL) > 0) {
int min;
/*
diff --git a/src/test/test-clock.c b/src/test/test-clock.c
new file mode 100644
index 0000000..92c4f79
--- /dev/null
+++ b/src/test/test-clock.c
@@ -0,0 +1,95 @@
+/***
+ This file is part of systemd.
+
+ Copyright (C) 2016 Canonical Ltd.
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <unistd.h>
+#include <fcntl.h>
+
+#include "macro.h"
+#include "fileio.h"
+#include "log.h"
+#include "clock-util.h"
+
+static void test_clock_is_localtime(void) {
+ char adjtime[] = "/tmp/test-adjtime.XXXXXX";
+ int fd;
+ FILE* f;
+
+ const struct scenario {
+ const char* contents;
+ int expected_result;
+ } scenarios[] = {
+ /* adjtime configures UTC */
+ {"0.0 0 0\n0\nUTC\n", 0},
+ /* adjtime configures local time */
+ {"0.0 0 0\n0\nLOCAL\n", 1},
+ /* 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},
+ /* 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 */
+ assert_se(clock_is_localtime("/nonexisting/adjtime") == 0);
+
+ fd = mkostemp_safe(adjtime, O_WRONLY|O_CLOEXEC);
+ assert(fd > 0);
+ log_info("adjtime test file: %s", adjtime);
+ f = fdopen(fd, "w");
+ assert(f);
+
+ for (size_t i = 0; i < ELEMENTSOF(scenarios); ++i) {
+ log_info("scenario #%zu:, expected result %i", i, scenarios[i].expected_result);
+ log_info("%s", scenarios[i].contents);
+ rewind(f);
+ ftruncate(fd, 0);
+ assert_se(write_string_stream(f, scenarios[i].contents, false) == 0);
+ assert_se(clock_is_localtime(adjtime) == scenarios[i].expected_result);
+ }
+
+ unlink(adjtime);
+}
+
+/* Test with the real /etc/adjtime */
+static void test_clock_is_localtime_system(void) {
+ int r;
+ r = clock_is_localtime(NULL);
+
+ if (access("/etc/adjtime", F_OK) == 0) {
+ log_info("/etc/adjtime exists, clock_is_localtime() == %i", r);
+ /* 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);
+}
+
+int main(int argc, char *argv[]) {
+ test_clock_is_localtime();
+ test_clock_is_localtime_system();
+
+ return 0;
+}
diff --git a/src/timedate/timedated.c b/src/timedate/timedated.c
index 2a10135..4e12056 100644
--- a/src/timedate/timedated.c
+++ b/src/timedate/timedated.c
@@ -78,7 +78,7 @@ static int context_read_data(Context *c) {
c->zone = t;
t = NULL;
- c->local_rtc = clock_is_localtime() > 0;
+ c->local_rtc = clock_is_localtime(NULL) > 0;
return 0;
}
@@ -125,30 +125,44 @@ static int context_write_data_local_rtc(Context *c) {
if (!w)
return -ENOMEM;
} else {
- char *p, *e;
+ char *p;
+ char *e = (char*) "\n"; /* default if there are not 3 lines with \n terminator */
+ const char *prepend = "";
size_t a, b;
- p = strchr(s, '\n');
- if (!p)
- return -EIO;
-
- p = strchr(p+1, '\n');
- if (!p)
- return -EIO;
-
- p++;
- e = strchr(p, '\n');
- if (!e)
- return -EIO;
+ p = strchrnul(s, '\n');
+ if (*p == '\0') {
+ /* only one line, no \n terminator */
+ prepend = "\n0\n";
+ } else if (p[1] == '\0') {
+ /* only one line, with \n terminator */
+ ++p;
+ prepend = "0\n";
+ } else {
+ p = strchr(p+1, '\n');
+ if (!p) {
+ /* only two lines, no \n terminator */
+ prepend = "\n";
+ p = s + strlen(s);
+ } else {
+ char *end;
+ /* third line might have a \n terminator or not */
+ p++;
+ end = strchr(p, '\n');
+ /* if we actually have a fourth line, use that as suffix "e", otherwise the default \n */
+ if (end)
+ e = end;
+ }
+ }
a = p - s;
b = strlen(e);
- w = new(char, a + (c->local_rtc ? 5 : 3) + b + 1);
+ w = new(char, a + (c->local_rtc ? 5 : 3) + strlen(prepend) + b + 1);
if (!w)
return -ENOMEM;
- *(char*) mempcpy(stpcpy(mempcpy(w, s, a), c->local_rtc ? "LOCAL" : "UTC"), e, b) = 0;
+ *(char*) mempcpy(stpcpy(stpcpy(mempcpy(w, s, a), prepend), c->local_rtc ? "LOCAL" : "UTC"), e, b) = 0;
if (streq(w, NULL_ADJTIME_UTC)) {
if (unlink("/etc/adjtime") < 0)
diff --git a/src/timesync/timesyncd.c b/src/timesync/timesyncd.c
index 23e1915..b67d672 100644
--- a/src/timesync/timesyncd.c
+++ b/src/timesync/timesyncd.c
@@ -122,7 +122,7 @@ int main(int argc, char *argv[]) {
goto finish;
}
- if (clock_is_localtime() > 0) {
+ if (clock_is_localtime(NULL) > 0) {
log_info("The system is configured to read the RTC time in the local time zone. "
"This mode can not be fully supported. All system time to RTC updates are disabled.");
m->rtc_local_time = true;