journalctl: make --utc work everywhere

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

4 files changed, 25 insertions, 13 deletions

diff --git a/src/journal/journalctl.c b/src/journal/journalctl.c
index 395f85c9ae..816934ee6b 100644
--- a/src/journal/journalctl.c
+++ b/src/journal/journalctl.c
@@ -890,8 +890,8 @@ static int list_boots(sd_journal *j) {
                 printf("% *i " SD_ID128_FORMAT_STR " %s—%s\n",
                        w, i - count + 1,
                        SD_ID128_FORMAT_VAL(id->id),
-                       format_timestamp(a, sizeof(a), id->first),
-                       format_timestamp(b, sizeof(b), id->last));
+                       format_timestamp_internal(a, sizeof(a), id->first, arg_utc),
+                       format_timestamp_internal(b, sizeof(b), id->last, arg_utc));
         }
 
         return 0;
@@ -1502,8 +1502,8 @@ static int verify(sd_journal *j) {
                         if (arg_verify_key && JOURNAL_HEADER_SEALED(f->header)) {
                                 if (validated > 0) {
                                         log_info("=> Validated from %s to %s, final %s entries not sealed.",
-                                                 format_timestamp(a, sizeof(a), first),
-                                                 format_timestamp(b, sizeof(b), validated),
+                                                 format_timestamp_internal(a, sizeof(a), first, arg_utc),
+                                                 format_timestamp_internal(b, sizeof(b), validated, arg_utc),
                                                  format_timespan(c, sizeof(c), last > validated ? last - validated : 0, 0));
                                 } else if (last > 0)
                                         log_info("=> No sealing yet, %s of entries not sealed.",
@@ -1898,11 +1898,11 @@ int main(int argc, char *argv[]) {
                 if (r > 0) {
                         if (arg_follow)
                                 printf("-- Logs begin at %s. --\n",
-                                       format_timestamp(start_buf, sizeof(start_buf), start));
+                                       format_timestamp_internal(start_buf, sizeof(start_buf), start, arg_utc));
                         else
                                 printf("-- Logs begin at %s, end at %s. --\n",
-                                       format_timestamp(start_buf, sizeof(start_buf), start),
-                                       format_timestamp(end_buf, sizeof(end_buf), end));
+                                       format_timestamp_internal(start_buf, sizeof(start_buf), start, arg_utc),
+                                       format_timestamp_internal(end_buf, sizeof(end_buf), end, arg_utc));
                 }
         }
 
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);