sysinstall: new component

src/basic/time-util.c

@@ -1697,6 +1697,16 @@ int get_timezone(char **ret) {
         return strdup_to(ret, e);
 }
 
+int get_timezone_prefer_env(char **ret) {
+        assert(ret);
+
+        const char *e = getenv("TZ");
+        if (e && e[0] == ':' && timezone_is_valid(e + 1, LOG_DEBUG))
+                return strdup_to(ret, e + 1);
+
+        return get_timezone(ret);
+}
+
 const char* etc_localtime(void) {
         static const char *cached = NULL;
 

src/basic/time-util.h

@@ -178,6 +178,7 @@ bool clock_supported(clockid_t clock);
 usec_t usec_shift_clock(usec_t x, clockid_t from, clockid_t to);
 
 int get_timezone(char **ret);
+int get_timezone_prefer_env(char **ret);
 const char* etc_localtime(void);
 
 int mktime_or_timegm_usec(struct tm *tm, bool utc, usec_t *ret);