fsckd: rework plymouth connection management

[elogind.git] / src / fsckd / fsckd.c

diff --git a/src/fsckd/fsckd.c b/src/fsckd/fsckd.c
index 4a61d80a18e3980d41ce30c8bb058e5d615fc41e..757b9f1143234d187309564662ce54574cf401ce 100644 (file)
--- a/src/fsckd/fsckd.c
+++ b/src/fsckd/fsckd.c
@@ -72,7 +72,10 @@ typedef struct Manager {
         FILE *console;
         double percent;
         int numdevices;
+
         int plymouth_fd;
+        sd_event_source *plymouth_event_source;
+
         bool plymouth_cancel_sent;
         bool cancel_requested;
 } Manager;
@@ -126,7 +129,10 @@ static void remove_client(Client **first, Client *item) {
         free(item);
 }
 
-static void on_plymouth_disconnect(Manager *m) {
+static void plymouth_disconnect(Manager *m) {
+        assert(m);
+
+        m->plymouth_event_source = sd_event_source_unref(m->plymouth_event_source);
         m->plymouth_fd = safe_close(m->plymouth_fd);
         m->plymouth_cancel_sent = false;
 }
@@ -135,24 +141,31 @@ static int plymouth_feedback_handler(sd_event_source *s, int fd, uint32_t revent
         Manager *m = userdata;
         Client *current;
         char buffer[6];
-        int r;
+        ssize_t l;
 
         assert(m);
 
-        r = read(m->plymouth_fd, buffer, sizeof(buffer));
-        if (r <= 0)
-                on_plymouth_disconnect(m);
-        else {
-               if (buffer[0] == '\15')
-                       log_error("Message update to plymouth wasn't delivered successfully");
-
-               /* the only answer support type we requested is a key interruption */
-               if (buffer[0] == '\2' && buffer[5] == '\3') {
-                       m->cancel_requested = true;
-                       /* cancel all connected clients */
-                       LIST_FOREACH(clients, current, m->clients)
-                               request_cancel_client(current);
-               }
+        l = read(m->plymouth_fd, buffer, sizeof(buffer));
+        if (l < 0) {
+                log_warning_errno(errno, "Got error while reading from plymouth: %m");
+                plymouth_disconnect(m);
+                return -errno;
+        }
+        if (l == 0) {
+                plymouth_disconnect(m);
+                return 0;
+        }
+
+        if (buffer[0] == '\15')
+                log_error("Message update to plymouth wasn't delivered successfully");
+
+        /* the only answer support type we requested is a key interruption */
+        if (buffer[0] == '\2' && buffer[5] == '\3') {
+                m->cancel_requested = true;
+
+                /* cancel all connected clients */
+                LIST_FOREACH(clients, current, m->clients)
+                        request_cancel_client(current);
         }
 
         return 0;
@@ -160,7 +173,7 @@ static int plymouth_feedback_handler(sd_event_source *s, int fd, uint32_t revent
 
 static int send_message_plymouth_socket(int plymouth_fd, const char *message, bool update) {
         _cleanup_free_ char *packet = NULL;
-        int r, n;
+        int n;
         char mode = 'M';
 
         if (update)
@@ -168,31 +181,37 @@ static int send_message_plymouth_socket(int plymouth_fd, const char *message, bo
 
         if (asprintf(&packet, "%c\002%c%s%n", mode, (int) (strlen(message) + 1), message, &n) < 0)
                 return log_oom();
-        r = loop_write(plymouth_fd, packet, n + 1, true);
-        return r;
-}
 
+        return loop_write(plymouth_fd, packet, n + 1, true);
+}
 
 static int send_message_plymouth(Manager *m, const char *message) {
-        int r;
         const char *plymouth_cancel_message = NULL;
+        int r;
 
         r = connect_plymouth(m);
         if (r < 0)
                 return r;
 
         if (!m->plymouth_cancel_sent) {
-                /* indicate to plymouth that we listen to Ctrl+C */
+
+                /* Indicate to plymouth that we listen to Ctrl+C */
                 r = loop_write(m->plymouth_fd, PLYMOUTH_REQUEST_KEY, sizeof(PLYMOUTH_REQUEST_KEY), true);
                 if (r < 0)
-                        return log_warning_errno(errno, "Can't send to plymouth cancel key: %m");
+                        return log_warning_errno(r, "Can't send to plymouth cancel key: %m");
+
                 m->plymouth_cancel_sent = true;
+
                 plymouth_cancel_message = strjoina("fsckd-cancel-msg:", _("Press Ctrl+C to cancel all filesystem checks in progress"));
+
                 r = send_message_plymouth_socket(m->plymouth_fd, plymouth_cancel_message, false);
                 if (r < 0)
                         log_warning_errno(r, "Can't send filesystem cancel message to plymouth: %m");
+
         } else if (m->numdevices == 0) {
+
                 m->plymouth_cancel_sent = false;
+
                 r = send_message_plymouth_socket(m->plymouth_fd, "", false);
                 if (r < 0)
                         log_warning_errno(r, "Can't clear plymouth filesystem cancel message: %m");
@@ -200,7 +219,7 @@ static int send_message_plymouth(Manager *m, const char *message) {
 
         r = send_message_plymouth_socket(m->plymouth_fd,  message, true);
         if (r < 0)
-                return log_warning_errno(errno, "Couldn't send \"%s\" to plymouth: %m", message);
+                return log_warning_errno(r, "Couldn't send \"%s\" to plymouth: %m", message);
 
         return 0;
 }
@@ -270,7 +289,7 @@ static int connect_plymouth(Manager *m) {
                 goto fail;
         }
 
-        r = sd_event_add_io(m->event, NULL, m->plymouth_fd, EPOLLIN, plymouth_feedback_handler, m);
+        r = sd_event_add_io(m->event, &m->plymouth_event_source, m->plymouth_fd, EPOLLIN, plymouth_feedback_handler, m);
         if (r < 0) {
                 log_warning_errno(r, "Can't listen to plymouth socket: %m");
                 goto fail;
@@ -279,7 +298,7 @@ static int connect_plymouth(Manager *m) {
         return 0;
 
 fail:
-        on_plymouth_disconnect(m);
+        plymouth_disconnect(m);
         return r;
 }
 
@@ -389,8 +408,10 @@ static void manager_free(Manager *m) {
                 fflush(m->console);
         }
 
+        plymouth_disconnect(m);
+
         safe_close(m->connection_fd);
-        safe_close(m->plymouth_fd);
+
         if (m->console)
                 fclose(m->console);