journalctl: make --utc work everywhere

The --utc option was introduced by commit
9fd290443f5f99fca0dcd4216b1de70f7d3b8db1.
Howerver, the implementation was incomplete.

3 files changed, 18 insertions, 6 deletions

diff --git a/src/shared/logs-show.c b/src/shared/logs-show.c
index d5d9d090b5..e30e6865ac 100644
--- a/src/shared/logs-show.c
+++ b/src/shared/logs-show.c
@@ -447,7 +447,7 @@ static int output_verbose(
         }
 
         fprintf(f, "%s [%s]\n",
-                format_timestamp_us(ts, sizeof(ts), realtime),
+                format_timestamp_us(ts, sizeof(ts), realtime, flags & OUTPUT_UTC),
                 cursor);
 
         JOURNAL_FOREACH_DATA_RETVAL(j, data, length, r) {
diff --git a/src/shared/time-util.c b/src/shared/time-util.c
index 066ef973ac..09f4a21354 100644
--- a/src/shared/time-util.c
+++ b/src/shared/time-util.c
@@ -152,7 +152,7 @@ struct timeval *timeval_store(struct timeval *tv, usec_t u) {
         return tv;
 }
 
-char *format_timestamp(char *buf, size_t l, usec_t t) {
+char *format_timestamp_internal(char *buf, size_t l, usec_t t, bool utc) {
         struct tm tm;
         time_t sec;
 
@@ -164,13 +164,21 @@ char *format_timestamp(char *buf, size_t l, usec_t t) {
 
         sec = (time_t) (t / USEC_PER_SEC);
 
-        if (strftime(buf, l, "%a %Y-%m-%d %H:%M:%S %Z", localtime_r(&sec, &tm)) <= 0)
+        if (utc)
+                gmtime_r(&sec, &tm);
+        else
+                localtime_r(&sec, &tm);
+        if (strftime(buf, l, "%a %Y-%m-%d %H:%M:%S %Z", &tm) <= 0)
                 return NULL;
 
         return buf;
 }
 
-char *format_timestamp_us(char *buf, size_t l, usec_t t) {
+char *format_timestamp(char *buf, size_t l, usec_t t) {
+        return format_timestamp_internal(buf, l, t, false);
+}
+
+char *format_timestamp_us(char *buf, size_t l, usec_t t, bool utc) {
         struct tm tm;
         time_t sec;
 
@@ -181,7 +189,10 @@ char *format_timestamp_us(char *buf, size_t l, usec_t t) {
                 return NULL;
 
         sec = (time_t) (t / USEC_PER_SEC);
-        localtime_r(&sec, &tm);
+        if (utc)
+                gmtime_r(&sec, &tm);
+        else
+                localtime_r(&sec, &tm);
 
         if (strftime(buf, l, "%a %Y-%m-%d %H:%M:%S", &tm) <= 0)
                 return NULL;
diff --git a/src/shared/time-util.h b/src/shared/time-util.h
index 8ba1cfee8e..16cc593cf5 100644
--- a/src/shared/time-util.h
+++ b/src/shared/time-util.h
@@ -84,8 +84,9 @@ struct timespec *timespec_store(struct timespec *ts, usec_t u);
 usec_t timeval_load(const struct timeval *tv) _pure_;
 struct timeval *timeval_store(struct timeval *tv, usec_t u);
 
+char *format_timestamp_internal(char *buf, size_t l, usec_t t, bool utc);
 char *format_timestamp(char *buf, size_t l, usec_t t);
-char *format_timestamp_us(char *buf, size_t l, usec_t t);
+char *format_timestamp_us(char *buf, size_t l, usec_t t, bool utc);
 char *format_timestamp_relative(char *buf, size_t l, usec_t t);
 char *format_timespan(char *buf, size_t l, usec_t t, usec_t accuracy);