X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fshutdownd.c;h=0ffa8b28815f4c1805b14e16c77cc7853609f272;hp=80ff2e9fba9b577842ae38ee51639d40dc93cb0f;hb=72b9ed828bd22f3ddd74b6853c183eebf006d6d8;hpb=2396fb04f78eaa9842c747e384218f0069446960

diff --git a/src/shutdownd.c b/src/shutdownd.c
index 80ff2e9fb..0ffa8b288 100644
--- a/src/shutdownd.c
+++ b/src/shutdownd.c
@@ -99,35 +99,32 @@ static int read_packet(int fd, struct shutdownd_command *_c) {
         return 1;
 }
 
-static void warn_wall(struct shutdownd_command *c) {
+static void warn_wall(usec_t n, struct shutdownd_command *c) {
+        char date[FORMAT_TIMESTAMP_MAX];
+        const char *prefix;
+        char *l = NULL;
 
         assert(c);
         assert(c->warn_wall);
 
-        if (c->wall_message[0])
-                utmp_wall(c->wall_message);
+        if (n >= c->elapse)
+                return;
+
+        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%s%s!", c->wall_message, c->wall_message[0] ? "\n" : "",
+                     prefix, format_timestamp(date, sizeof(date), c->elapse)) < 0)
+                log_error("Failed to allocate wall message");
         else {
-                char date[FORMAT_TIMESTAMP_MAX];
-                const char* prefix;
-                char *l;
-
-                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,
-                             format_timestamp(date, sizeof(date), c->elapse)) < 0)
-                        log_error("Failed to allocate wall message");
-                else {
-                        utmp_wall(l);
-                        free(l);
-                }
+                utmp_wall(l, NULL);
+                free(l);
         }
 }
 
@@ -151,8 +148,10 @@ static usec_t when_wall(usec_t n, usec_t elapse) {
 
         left = elapse - n;
         for (i = 0; i < ELEMENTSOF(table); i++)
-                if (n + table[i].delay >= elapse)
+                if (n + table[i].delay >= elapse) {
                         sub = ((left / table[i].interval) * table[i].interval);
+                        break;
+                }
 
         if (i >= ELEMENTSOF(table))
                 sub = ((left / USEC_PER_HOUR) * USEC_PER_HOUR);
@@ -173,7 +172,7 @@ int main(int argc, char *argv[]) {
                 _FD_MAX
         };
 
-        int r = 4, n_fds;
+        int r = EXIT_FAILURE, n_fds;
         int one = 1;
         struct shutdownd_command c;
         struct pollfd pollfd[_FD_MAX];
@@ -182,31 +181,33 @@ int main(int argc, char *argv[]) {
 
         if (getppid() != 1) {
                 log_error("This program should be invoked by init only.");
-                return 1;
+                return EXIT_FAILURE;
         }
 
         if (argc > 1) {
                 log_error("This program does not take arguments.");
-                return 1;
+                return EXIT_FAILURE;
         }
 
         log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
         log_parse_environment();
         log_open();
 
+        umask(0022);
+
         if ((n_fds = sd_listen_fds(true)) < 0) {
                 log_error("Failed to read listening file descriptors from environment: %s", strerror(-r));
-                return 1;
+                return EXIT_FAILURE;
         }
 
         if (n_fds != 1) {
                 log_error("Need exactly one file descriptor.");
-                return 2;
+                return EXIT_FAILURE;
         }
 
         if (setsockopt(SD_LISTEN_FDS_START, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) {
                 log_error("SO_PASSCRED failed: %m");
-                return 3;
+                return EXIT_FAILURE;
         }
 
         zero(c);
@@ -224,7 +225,7 @@ int main(int argc, char *argv[]) {
 
                 if ((pollfd[i].fd = timerfd_create(CLOCK_REALTIME, TFD_NONBLOCK|TFD_CLOEXEC)) < 0) {
                         log_error("timerfd_create(): %m");
-                        failed = false;
+                        failed = true;
                 }
         }
 
@@ -272,7 +273,7 @@ int main(int argc, char *argv[]) {
                                         /* Warn immediately if less than 15 minutes are left */
                                         if (n < c.elapse &&
                                             n + 15*USEC_PER_MINUTE >= c.elapse)
-                                                warn_wall(&c);
+                                                warn_wall(n, &c);
                                 }
 
                                 /* Disallow logins 5 minutes prior to shutdown */
@@ -300,7 +301,7 @@ int main(int argc, char *argv[]) {
                 if (pollfd[FD_WALL_TIMER].revents) {
                         struct itimerspec its;
 
-                        warn_wall(&c);
+                        warn_wall(n, &c);
                         flush_fd(pollfd[FD_WALL_TIMER].fd);
 
                         /* Restart timer */
@@ -315,8 +316,10 @@ int main(int argc, char *argv[]) {
                 if (pollfd[FD_NOLOGIN_TIMER].revents) {
                         int e;
 
-                        if ((e = touch("/etc/nologin")) < 0)
-                                log_error("Failed to create /etc/nologin: %s", strerror(-e));
+                        log_info("Creating /run/nologin, blocking further logins...");
+
+                        if ((e = write_one_line_file_atomic("/run/nologin", "System is going down.")) < 0)
+                                log_error("Failed to create /run/nologin: %s", strerror(-e));
                         else
                                 unlink_nologin = true;
 
@@ -330,7 +333,7 @@ int main(int argc, char *argv[]) {
 
         } while (c.elapse > 0);
 
-        r = 0;
+        r = EXIT_SUCCESS;
 
         log_debug("systemd-shutdownd stopped as pid %lu", (unsigned long) getpid());
 
@@ -340,20 +343,27 @@ finish:
                 if (pollfd[i].fd >= 0)
                         close_nointr_nofail(pollfd[i].fd);
 
-        if (exec_shutdown) {
+        if (unlink_nologin)
+                unlink("/run/nologin");
+
+        if (exec_shutdown && !c.dry_run) {
                 char sw[3];
 
                 sw[0] = '-';
                 sw[1] = c.mode;
                 sw[2] = 0;
 
-                execl(SYSTEMCTL_BINARY_PATH, "shutdown", sw, "now", NULL);
+                execl(SYSTEMCTL_BINARY_PATH,
+                      "shutdown",
+                      sw,
+                      "now",
+                      (c.warn_wall && c.wall_message[0]) ? c.wall_message :
+                      (c.warn_wall ? NULL : "--no-wall"),
+                      NULL);
+
                 log_error("Failed to execute /sbin/shutdown: %m");
         }
 
-        if (unlink_nologin)
-                unlink("/etc/nologin");
-
         sd_notify(false,
                   "STATUS=Exiting...");