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timedatectl: explain everything nobody wants to know about DST

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This commit is contained in:
Kay Sievers 2012-11-02 03:45:07 +01:00
parent b7f1542c8b
commit f18ca9dcde
1 changed files with 55 additions and 9 deletions
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64
src/timedate/timedatectl.c
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@ -33,6 +33,7 @@
#include "hwclock.h"
#include "strv.h"
#include "pager.h"
#include "time-dst.h"
static bool arg_adjust_system_clock = false;
static bool arg_no_pager = false;
@ -83,9 +84,13 @@ static bool ntp_synced(void) {
static void print_status_info(StatusInfo *i) {
usec_t n;
char a[FORMAT_TIMESTAMP_MAX];
char b[FORMAT_TIMESTAMP_MAX];
struct tm tm;
time_t sec;
char *zc, *zn;
time_t t, tc, tn;
bool is_dstc, is_dstn;
int r;
assert(i);
@ -94,14 +99,14 @@ static void print_status_info(StatusInfo *i) {
sec = (time_t) (n / USEC_PER_SEC);
zero(tm);
assert_se(strftime(b, sizeof(b), "%a, %Y-%m-%d %H:%M:%S %Z", localtime_r(&sec, &tm)) > 0);
char_array_0(b);
printf(" Local time: %s\n", b);
assert_se(strftime(a, sizeof(a), "%a, %Y-%m-%d %H:%M:%S %Z", localtime_r(&sec, &tm)) > 0);
char_array_0(a);
printf(" Local time: %s\n", a);
zero(tm);
assert_se(strftime(b, sizeof(b), "%a, %Y-%m-%d %H:%M:%S UTC", gmtime_r(&sec, &tm)) > 0);
char_array_0(b);
printf(" Universal time: %s\n", b);
assert_se(strftime(a, sizeof(a), "%a, %Y-%m-%d %H:%M:%S UTC", gmtime_r(&sec, &tm)) > 0);
char_array_0(a);
printf(" Universal time: %s\n", a);
zero(tm);
r = hwclock_get_time(&tm);
@ -109,20 +114,61 @@ static void print_status_info(StatusInfo *i) {
/* Calculcate the week-day */
mktime(&tm);
assert_se(strftime(b, sizeof(b), "%a, %Y-%m-%d %H:%M:%S", &tm) > 0);
char_array_0(b);
printf(" RTC time: %s\n", b);
assert_se(strftime(a, sizeof(a), "%a, %Y-%m-%d %H:%M:%S", &tm) > 0);
char_array_0(a);
printf(" RTC time: %s\n", a);
}
zero(tm);
assert_se(strftime(a, sizeof(a), "%z", localtime_r(&sec, &tm)) > 0);
char_array_0(a);
printf(" Timezone: %s\n"
" UTC offset: %s\n"
" NTP enabled: %s\n"
"NTP synchronized: %s\n"
" RTC in local TZ: %s\n",
strna(i->timezone),
a,
yes_no(i->ntp),
yes_no(ntp_synced()),
yes_no(i->local_rtc));
r = time_get_dst(sec, "/etc/localtime",
&tc, &zc, &is_dstc,
&tn, &zn, &is_dstn);
if (r >= 0) {
printf(" DST active: %s\n", yes_no(is_dstc));
t = tc - 1;
zero(tm);
assert_se(strftime(a, sizeof(a), "%a, %Y-%m-%d %H:%M:%S %Z", localtime_r(&t, &tm)) > 0);
char_array_0(a);
zero(tm);
assert_se(strftime(b, sizeof(b), "%a, %Y-%m-%d %H:%M:%S %Z", localtime_r(&tc, &tm)) > 0);
char_array_0(b);
printf(" Last DST change: %s → %s, one hour %s\n"
" %s\n"
" %s\n",
strna(zn), strna(zc), is_dstc ? "forward" : "backwards", a, b);
t = tn - 1;
zero(tm);
assert_se(strftime(a, sizeof(a), "%a, %Y-%m-%d %H:%M:%S %Z", localtime_r(&t, &tm)) > 0);
char_array_0(a);
zero(tm);
assert_se(strftime(b, sizeof(b), "%a, %Y-%m-%d %H:%M:%S %Z", localtime_r(&tn, &tm)) > 0);
char_array_0(b);
printf(" Next DST change: %s → %s, one hour %s\n"
" %s\n"
" %s\n",
strna(zc), strna(zn), is_dstn ? "forward" : "backwards", a, b);
free(zc);
free(zn);
}
if (i->local_rtc)
fputs("\n" ANSI_HIGHLIGHT_ON
"Warning: The RTC is configured to maintain time in the local time zone. This\n"