systemctl: when called as shutdown, properly handle user specified wall message

[elogind.git] / src / systemctl.c

diff --git a/src/systemctl.c b/src/systemctl.c
index ec92504f42f20dad2d83e4e3da3c77c1c5fb6b14..68e4a909eb6e4b8cc586ba6661ca30277f68af0e 100644 (file)
--- a/src/systemctl.c
+++ b/src/systemctl.c
@@ -39,6 +39,7 @@
 #include "utmp-wtmp.h"
 #include "special.h"
 #include "initreq.h"
+#include "strv.h"
 
 static const char *arg_type = NULL;
 static bool arg_all = false;
@@ -139,6 +140,23 @@ static void warn_wall(enum action action) {
         if (arg_no_wall)
                 return;
 
+        if (arg_wall) {
+                char *p;
+
+                if (!(p = strv_join(arg_wall, " "))) {
+                        log_error("Failed to join strings.");
+                        return;
+                }
+
+                if (*p) {
+                        utmp_wall(p);
+                        free(p);
+                        return;
+                }
+
+                free(p);
+        }
+
         if (!table[action])
                 return;
 
@@ -1893,12 +1911,7 @@ static int parse_argv(int argc, char *argv[]) {
         return systemctl_parse_argv(argc, argv);
 }
 
-static int talk_upstart(DBusConnection *bus) {
-        log_error("Talking upstart");
-        return 0;
-}
-
-static int talk_initctl(void) {
+static int action_to_runlevel(void) {
 
         static const char table[_ACTION_MAX] = {
                 [ACTION_HALT] =      '0',
@@ -1911,26 +1924,114 @@ static int talk_initctl(void) {
                 [ACTION_RESCUE] =    '1'
         };
 
+        assert(arg_action < _ACTION_MAX);
+
+        return table[arg_action];
+}
+
+static int talk_upstart(DBusConnection *bus) {
+        DBusMessage *m = NULL, *reply = NULL;
+        DBusError error;
+        int previous, rl, r;
+        char
+                env1_buf[] = "RUNLEVEL=X",
+                env2_buf[] = "PREVLEVEL=X";
+        char *env1 = env1_buf, *env2 = env2_buf;
+        const char *emit = "runlevel";
+        dbus_bool_t b_false = FALSE;
+        DBusMessageIter iter, sub;
+
+        dbus_error_init(&error);
+
+        if (!(rl = action_to_runlevel()))
+                return 0;
+
+        if (utmp_get_runlevel(&previous, NULL) < 0)
+                previous = 'N';
+
+        if (!(m = dbus_message_new_method_call(
+                              "com.ubuntu.Upstart",
+                              "/com/ubuntu/Upstart",
+                              "com.ubuntu.Upstart0_6",
+                              "EmitEvent"))) {
+
+                log_error("Could not allocate message.");
+                return -ENOMEM;
+        }
+
+        dbus_message_iter_init_append(m, &iter);
+
+        env1_buf[sizeof(env1_buf)-2] = rl;
+        env2_buf[sizeof(env2_buf)-2] = previous;
+
+        if (!dbus_message_iter_append_basic(&iter, DBUS_TYPE_STRING, &emit) ||
+            !dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "s", &sub) ||
+            !dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &env1) ||
+            !dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &env2) ||
+            !dbus_message_iter_close_container(&iter, &sub) ||
+            !dbus_message_iter_append_basic(&iter, DBUS_TYPE_BOOLEAN, &b_false)) {
+                log_error("Could not append arguments to message.");
+                r = -ENOMEM;
+                goto finish;
+        }
+
+        if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
+
+                if (error_is_no_service(&error)) {
+                        r = 0;
+                        goto finish;
+                }
+
+                log_error("Failed to issue method call: %s", error.message);
+                r = -EIO;
+                goto finish;
+        }
+
+        r = 1;
+
+finish:
+        if (m)
+                dbus_message_unref(m);
+
+        if (reply)
+                dbus_message_unref(reply);
+
+        dbus_error_free(&error);
+
+        return r;
+}
+
+static int talk_initctl(void) {
         struct init_request request;
         int r, fd;
+        char rl;
 
-        if (!table[arg_action])
+        if (!(rl = action_to_runlevel()))
                 return 0;
 
         zero(request);
         request.magic = INIT_MAGIC;
         request.sleeptime = 0;
         request.cmd = INIT_CMD_RUNLVL;
-        request.runlevel = table[arg_action];
+        request.runlevel = rl;
+
+        if ((fd = open(INIT_FIFO, O_WRONLY|O_NDELAY|O_CLOEXEC|O_NOCTTY)) < 0) {
+
+                if (errno == ENOENT)
+                        return 0;
 
-        if ((fd = open(INIT_FIFO, O_WRONLY|O_NDELAY|O_CLOEXEC|O_NOCTTY)) < 0)
+                log_error("Failed to open "INIT_FIFO": %m");
                 return -errno;
+        }
 
+        errno = 0;
         r = loop_write(fd, &request, sizeof(request), false) != sizeof(request);
         close_nointr_nofail(fd);
 
-        if (r < 0)
+        if (r < 0) {
+                log_error("Failed to write to "INIT_FIFO": %m");
                 return errno ? -errno : -EIO;
+        }
 
         return 1;
 }
@@ -2068,7 +2169,11 @@ static int start_with_fallback(DBusConnection *bus) {
 
         /* Nothing else worked, so let's try
          * /dev/initctl */
-        return talk_initctl();
+        if ((r = talk_initctl()) != 0)
+                return 0;
+
+        log_error("Failed to talk to init daemon.");
+        return -EIO;
 }
 
 static int halt_main(DBusConnection *bus) {