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systemctl: warn in intervals before going down when delayed shutdown is used

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This commit is contained in:
Lennart Poettering 2010-08-16 19:26:27 +02:00
parent 6b5ad000ab
commit 9be9828c00
4 changed files with 161 additions and 44 deletions
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1
Makefile.am
View File

@ -535,6 +535,7 @@ systemd_random_seed_LDADD = \
libsystemd-basic.la
systemd_shutdownd_SOURCES = \
src/utmp-wtmp.c \
src/sd-daemon.c \
src/shutdownd.c

170
src/shutdownd.c
View File

@ -34,6 +34,7 @@
#include "macro.h"
#include "util.h"
#include "sd-daemon.h"
#include "utmp-wtmp.h"
static int read_packet(int fd, struct shutdownd_command *_c) {
struct msghdr msghdr;
@ -92,24 +93,95 @@ static int read_packet(int fd, struct shutdownd_command *_c) {
return 0;
}
char_array_0(c.wall_message);
*_c = c;
return 1;
}
static void warn_wall(struct shutdownd_command *c) {
assert(c);
assert(c->warn_wall);
if (c->wall_message[0])
utmp_wall(c->wall_message);
else {
time_t s;
char buf[27];
const char* prefix;
char *l;
s = c->elapse / USEC_PER_SEC;
ctime_r(&s, buf);
if (c->mode == 'H')
prefix = "The system is going down for system halt at";
else if (c->mode == 'P')
prefix = "The system is going down for power-off at";
else if (c->mode == 'r')
prefix = "The system is going down for reboot at";
else
assert_not_reached("Unknown mode!");
if (asprintf(&l, "%s %s!", prefix, strstrip(buf)) < 0)
log_error("Failed to allocate wall message");
else {
utmp_wall(l);
free(l);
}
}
}
static usec_t when_wall(usec_t n, usec_t elapse) {
static const struct {
usec_t delay;
usec_t interval;
} table[] = {
{ 10 * USEC_PER_MINUTE, USEC_PER_MINUTE },
{ USEC_PER_HOUR, 15 * USEC_PER_MINUTE },
{ 3 * USEC_PER_HOUR, 30 * USEC_PER_MINUTE }
};
usec_t left, sub;
unsigned i;
/* If the time is already passed, then don't announce */
if (n >= elapse)
return 0;
left = elapse - n;
for (i = 0; i < ELEMENTSOF(table); i++)
if (n + table[i].delay >= elapse)
sub = ((left / table[i].interval) * table[i].interval);
if (i >= ELEMENTSOF(table))
sub = ((left / USEC_PER_HOUR) * USEC_PER_HOUR);
return elapse > sub ? elapse - sub : 1;
}
static usec_t when_nologin(usec_t elapse) {
return elapse > 5*USEC_PER_MINUTE ? elapse - 5*USEC_PER_MINUTE : 1;
}
int main(int argc, char *argv[]) {
enum {
FD_SOCKET,
FD_SHUTDOWN_TIMER,
FD_WALL_TIMER,
FD_NOLOGIN_TIMER,
FD_SHUTDOWN_TIMER,
_FD_MAX
};
int r = 4, n;
int r = 4, n_fds;
int one = 1;
unsigned n_fds = 1;
struct shutdownd_command c;
struct pollfd pollfd[_FD_MAX];
bool exec_shutdown = false, unlink_nologin = false;
bool exec_shutdown = false, unlink_nologin = false, failed = false;
unsigned i;
if (getppid() != 1) {
log_error("This program should be invoked by init only.");
@ -124,12 +196,12 @@ int main(int argc, char *argv[]) {
log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
log_parse_environment();
if ((n = sd_listen_fds(true)) < 0) {
if ((n_fds = sd_listen_fds(true)) < 0) {
log_error("Failed to read listening file descriptors from environment: %s", strerror(-r));
return 1;
}
if (n != 1) {
if (n_fds != 1) {
log_error("Need exactly one file descriptor.");
return 2;
}
@ -144,10 +216,22 @@ int main(int argc, char *argv[]) {
pollfd[FD_SOCKET].fd = SD_LISTEN_FDS_START;
pollfd[FD_SOCKET].events = POLLIN;
pollfd[FD_SHUTDOWN_TIMER].fd = -1;
pollfd[FD_SHUTDOWN_TIMER].events = POLLIN;
pollfd[FD_NOLOGIN_TIMER].fd = -1;
pollfd[FD_NOLOGIN_TIMER].events = POLLIN;
for (i = 0; i < _FD_MAX; i++) {
if (i == FD_SOCKET)
continue;
pollfd[i].events = POLLIN;
if ((pollfd[i].fd = timerfd_create(CLOCK_REALTIME, TFD_NONBLOCK|TFD_CLOEXEC)) < 0) {
log_error("timerfd_create(): %m");
failed = false;
}
}
if (failed)
goto finish;
log_debug("systemd-shutdownd running as pid %lu", (unsigned long) getpid());
@ -157,8 +241,9 @@ int main(int argc, char *argv[]) {
do {
int k;
usec_t n;
if (poll(pollfd, n_fds, -1) < 0) {
if (poll(pollfd, _FD_MAX, -1) < 0) {
if (errno == EAGAIN || errno == EINTR)
continue;
@ -167,6 +252,8 @@ int main(int argc, char *argv[]) {
goto finish;
}
n = now(CLOCK_REALTIME);
if (pollfd[FD_SOCKET].revents) {
if ((k = read_packet(pollfd[FD_SOCKET].fd, &c)) < 0)
@ -175,21 +262,25 @@ int main(int argc, char *argv[]) {
struct itimerspec its;
char buf[27];
if (pollfd[FD_SHUTDOWN_TIMER].fd < 0)
if ((pollfd[FD_SHUTDOWN_TIMER].fd = timerfd_create(CLOCK_REALTIME, TFD_NONBLOCK|TFD_CLOEXEC)) < 0) {
log_error("timerfd_create(): %m");
if (c.warn_wall) {
/* Send wall messages every so often */
zero(its);
timespec_store(&its.it_value, when_wall(n, c.elapse));
if (timerfd_settime(pollfd[FD_WALL_TIMER].fd, TFD_TIMER_ABSTIME, &its, NULL) < 0) {
log_error("timerfd_settime(): %m");
goto finish;
}
if (pollfd[FD_NOLOGIN_TIMER].fd < 0)
if ((pollfd[FD_NOLOGIN_TIMER].fd = timerfd_create(CLOCK_REALTIME, TFD_NONBLOCK|TFD_CLOEXEC)) < 0) {
log_error("timerfd_create(): %m");
goto finish;
}
/* Warn immediately if less than 15 minutes are left */
if (n < c.elapse &&
n + 15*USEC_PER_MINUTE >= c.elapse)
warn_wall(&c);
}
/* Disallow logins 5 minutes prior to shutdown */
zero(its);
timespec_store(&its.it_value, c.elapse > 5*USEC_PER_MINUTE ? c.elapse - 5*USEC_PER_MINUTE : 0);
timespec_store(&its.it_value, when_nologin(c.elapse));
if (timerfd_settime(pollfd[FD_NOLOGIN_TIMER].fd, TFD_TIMER_ABSTIME, &its, NULL) < 0) {
log_error("timerfd_settime(): %m");
goto finish;
@ -203,8 +294,6 @@ int main(int argc, char *argv[]) {
goto finish;
}
n_fds = 3;
ctime_r(&its.it_value.tv_sec, buf);
sd_notifyf(false,
@ -213,8 +302,22 @@ int main(int argc, char *argv[]) {
}
}
if (pollfd[FD_NOLOGIN_TIMER].fd >= 0 &&
pollfd[FD_NOLOGIN_TIMER].revents) {
if (pollfd[FD_WALL_TIMER].revents) {
struct itimerspec its;
warn_wall(&c);
flush_fd(pollfd[FD_WALL_TIMER].fd);
/* Restart timer */
zero(its);
timespec_store(&its.it_value, when_wall(n, c.elapse));
if (timerfd_settime(pollfd[FD_WALL_TIMER].fd, TFD_TIMER_ABSTIME, &its, NULL) < 0) {
log_error("timerfd_settime(): %m");
goto finish;
}
}
if (pollfd[FD_NOLOGIN_TIMER].revents) {
int e;
if ((e = touch("/etc/nologin")) < 0)
@ -222,15 +325,10 @@ int main(int argc, char *argv[]) {
else
unlink_nologin = true;
/* Disarm nologin timer */
close_nointr_nofail(pollfd[FD_NOLOGIN_TIMER].fd);
pollfd[FD_NOLOGIN_TIMER].fd = -1;
n_fds = 2;
flush_fd(pollfd[FD_NOLOGIN_TIMER].fd);
}
if (pollfd[FD_SHUTDOWN_TIMER].fd >= 0 &&
pollfd[FD_SHUTDOWN_TIMER].revents) {
if (pollfd[FD_SHUTDOWN_TIMER].revents) {
exec_shutdown = true;
goto finish;
}
@ -242,14 +340,10 @@ int main(int argc, char *argv[]) {
log_debug("systemd-shutdownd stopped as pid %lu", (unsigned long) getpid());
finish:
if (pollfd[FD_SOCKET].fd >= 0)
close_nointr_nofail(pollfd[FD_SOCKET].fd);
if (pollfd[FD_SHUTDOWN_TIMER].fd >= 0)
close_nointr_nofail(pollfd[FD_SHUTDOWN_TIMER].fd);
if (pollfd[FD_NOLOGIN_TIMER].fd >= 0)
close_nointr_nofail(pollfd[FD_NOLOGIN_TIMER].fd);
for (i = 0; i < _FD_MAX; i++)
if (pollfd[i].fd >= 0)
close_nointr_nofail(pollfd[i].fd);
if (exec_shutdown) {
char sw[3];

10
src/shutdownd.h
View File

@ -25,11 +25,21 @@
#include "util.h"
#include "macro.h"
/* This is a private message, we don't care much about ABI
* stability. */
_packed_ struct shutdownd_command {
usec_t elapse;
char mode; /* H, P, r, i.e. the switches usually passed to
* shutdown to select whether to halt, power-off or
* reboot the machine */
bool warn_wall;
/* Yepp, sometimes we are lazy and use fixed-size strings like
* this one. Shame on us. But then again, we'd have to
* pre-allocate the receive buffer anyway, so there's nothing
* too bad here. */
char wall_message[4096];
};
#endif

24
src/systemctl.c
View File

@ -4696,7 +4696,7 @@ static int systemctl_main(DBusConnection *bus, int argc, char *argv[], DBusError
return verbs[i].dispatch(bus, argv + optind, left);
}
static int send_shutdownd(usec_t t, char mode) {
static int send_shutdownd(usec_t t, char mode, bool warn, const char *message) {
int fd = -1;
struct msghdr msghdr;
struct iovec iovec;
@ -4711,6 +4711,10 @@ static int send_shutdownd(usec_t t, char mode) {
zero(c);
c.elapse = t;
c.mode = mode;
c.warn_wall = warn;
if (message)
strncpy(c.wall_message, message, sizeof(c.wall_message));
if ((fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0)
return -errno;
@ -4814,10 +4818,18 @@ static int halt_main(DBusConnection *bus) {
}
if (arg_when > 0) {
if ((r = send_shutdownd(arg_when,
arg_action == ACTION_HALT ? 'H' :
arg_action == ACTION_POWEROFF ? 'P' :
'r')) < 0)
char *m;
m = strv_join(arg_wall, " ");
r = send_shutdownd(arg_when,
arg_action == ACTION_HALT ? 'H' :
arg_action == ACTION_POWEROFF ? 'P' :
'r',
!arg_no_wall,
m);
free(m);
if (r < 0)
log_warning("Failed to talk to shutdownd, proceeding with immediate shutdown: %s", strerror(-r));
else
return 0;
@ -4937,7 +4949,7 @@ int main(int argc, char*argv[]) {
break;
case ACTION_CANCEL_SHUTDOWN:
retval = send_shutdownd(0, 0) < 0;
retval = send_shutdownd(0, 0, false, NULL) < 0;
break;
case ACTION_INVALID: