From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Tue, 11 Nov 2025 18:35:45 +0000 (+0900)
Subject: musl: time-util: introduce get_tzname() helper function
X-Git-Tag: v259-rc1~81^2~2
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=6431f2e072eef1c706b716d3a902fefcb1e63c40;p=thirdparty%2Fsystemd.git

musl: time-util: introduce get_tzname() helper function

musl leaves the DST timezone name unset if there is no DST.
The helper function maps that back to no DST.
---

diff --git a/src/basic/time-util.c b/src/basic/time-util.c
index c09c9fd6d02..8e0d4cc0304 100644
--- a/src/basic/time-util.c
+++ b/src/basic/time-util.c
@@ -625,6 +625,14 @@ char* format_timespan(char *buf, size_t l, usec_t t, usec_t accuracy) {
         return buf;
 }
 
+const char* get_tzname(bool dst) {
+        /* musl leaves the DST timezone name unset if there is no DST, map this back to no DST */
+        if (dst && isempty(tzname[1]))
+                dst = false;
+
+        return empty_to_null(tzname[dst]);
+}
+
 int parse_gmtoff(const char *t, long *ret) {
         int r;
 
@@ -1078,10 +1086,7 @@ int parse_timestamp(const char *t, usec_t *ret) {
          * not follow the timezone change in the current area. */
         tzset();
         for (int j = 0; j <= 1; j++) {
-                if (isempty(tzname[j]))
-                        continue;
-
-                if (!streq(tz, tzname[j]))
+                if (!streq_ptr(tz, get_tzname(j)))
                         continue;
 
                 /* The specified timezone matches tzname[] of the local timezone. */
diff --git a/src/basic/time-util.h b/src/basic/time-util.h
index 322a2ece6b2..b5530e3e921 100644
--- a/src/basic/time-util.h
+++ b/src/basic/time-util.h
@@ -149,6 +149,7 @@ static inline char* format_timestamp(char *buf, size_t l, usec_t t) {
 #define FORMAT_TIMESTAMP_STYLE(t, style) \
         format_timestamp_style((char[FORMAT_TIMESTAMP_MAX]){}, FORMAT_TIMESTAMP_MAX, t, style)
 
+const char* get_tzname(bool dst);
 int parse_gmtoff(const char *t, long *ret);
 int parse_timestamp(const char *t, usec_t *ret);
 
diff --git a/src/core/manager.c b/src/core/manager.c
index 90a3f25aebd..b501d3f1c5b 100644
--- a/src/core/manager.c
+++ b/src/core/manager.c
@@ -3208,7 +3208,7 @@ static int manager_dispatch_timezone_change(
         /* Read the new timezone */
         tzset();
 
-        log_debug("Timezone has been changed (now: %s).", tzname[daylight]);
+        log_debug("Timezone has been changed (now: %s).", get_tzname(daylight));
 
         HASHMAP_FOREACH(u, m->units)
                 if (UNIT_VTABLE(u)->timezone_change)
diff --git a/src/shared/calendarspec.c b/src/shared/calendarspec.c
index 0e12e55a977..ed8e202a2ee 100644
--- a/src/shared/calendarspec.c
+++ b/src/shared/calendarspec.c
@@ -370,9 +370,10 @@ int calendar_spec_to_string(const CalendarSpec *c, char **ret) {
 
                 tzset();
 
-                if (!isempty(tzname[c->dst])) {
+                const char *z = get_tzname(c->dst);
+                if (z) {
                         fputc(' ', f);
-                        fputs(tzname[c->dst], f);
+                        fputs(z, f);
                 }
         }
 
@@ -897,10 +898,11 @@ int calendar_spec_from_string(const char *p, CalendarSpec **ret) {
 
                 /* Check if the local timezone was specified? */
                 for (j = 0; j <= 1; j++) {
-                        if (isempty(tzname[j]))
+                        const char *z = get_tzname(j);
+                        if (!z)
                                 continue;
 
-                        e = endswith_no_case(p, tzname[j]);
+                        e = endswith_no_case(p, z);
                         if (!e)
                                 continue;
                         if (e == p)
diff --git a/src/test/test-time-util.c b/src/test/test-time-util.c
index 7bcf0ae7ee3..8f5d8bd5a8d 100644
--- a/src/test/test-time-util.c
+++ b/src/test/test-time-util.c
@@ -15,7 +15,7 @@
 static void set_timezone(const char *tz) {
         ASSERT_OK(set_unset_env("TZ", tz, /* overwrite = */ true));
         tzset();
-        log_info("TZ=%s, tzname[0]=%s, tzname[1]=%s", strna(getenv("TZ")), strempty(tzname[0]), strempty(tzname[1]));
+        log_info("TZ=%s, tzname[0]=%s, tzname[1]=%s", strna(getenv("TZ")), strempty(get_tzname(/* dst= */ false)), strempty(get_tzname(/* dst= */ true)));
 }
 
 TEST(parse_sec) {
@@ -1109,15 +1109,15 @@ TEST(in_utc_timezone) {
 
         assert_se(setenv("TZ", "UTC", 1) >= 0);
         assert_se(in_utc_timezone());
-        ASSERT_STREQ(tzname[0], "UTC");
-        ASSERT_STREQ(tzname[1], "UTC");
+        ASSERT_STREQ(get_tzname(/* dst= */ false), "UTC");
+        ASSERT_STREQ(get_tzname(/* dst= */ true), "UTC");
         assert_se(timezone == 0);
         assert_se(daylight == 0);
 
         assert_se(setenv("TZ", "Europe/Berlin", 1) >= 0);
         assert_se(!in_utc_timezone());
-        ASSERT_STREQ(tzname[0], "CET");
-        ASSERT_STREQ(tzname[1], "CEST");
+        ASSERT_STREQ(get_tzname(/* dst= */ false), "CET");
+        ASSERT_STREQ(get_tzname(/* dst= */ true), "CEST");
 }
 
 TEST(map_clock_usec) {
diff --git a/src/timedate/timedated.c b/src/timedate/timedated.c
index 6e21d1a73ab..9016f6c4a6d 100644
--- a/src/timedate/timedated.c
+++ b/src/timedate/timedated.c
@@ -733,9 +733,9 @@ static int method_set_timezone(sd_bus_message *m, void *userdata, sd_bus_error *
         log_struct(LOG_INFO,
                    LOG_MESSAGE_ID(SD_MESSAGE_TIMEZONE_CHANGE_STR),
                    LOG_ITEM("TIMEZONE=%s", c->zone),
-                   LOG_ITEM("TIMEZONE_SHORTNAME=%s", tzname[daylight]),
+                   LOG_ITEM("TIMEZONE_SHORTNAME=%s", get_tzname(daylight)),
                    LOG_ITEM("DAYLIGHT=%i", daylight),
-                   LOG_MESSAGE("Changed time zone to '%s' (%s).", c->zone, tzname[daylight]));
+                   LOG_MESSAGE("Changed time zone to '%s' (%s).", c->zone, get_tzname(daylight)));
 
         (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m),
                                               "/org/freedesktop/timedate1", "org.freedesktop.timedate1", "Timezone",