chiark / gitweb /
fsckd: rework plymouth connection management
[elogind.git] / src / fsckd / fsckd.c
index d4e9896e91cbc1bb1bf7fde7d9ffca4248ccf1a1..757b9f1143234d187309564662ce54574cf401ce 100644 (file)
 #include <sys/un.h>
 #include <unistd.h>
 
+#include "sd-daemon.h"
 #include "build.h"
 #include "def.h"
 #include "event-util.h"
-#include "fsckd.h"
 #include "log.h"
 #include "list.h"
 #include "macro.h"
-#include "sd-daemon.h"
 #include "socket-util.h"
 #include "util.h"
+#include "fsckd.h"
 
 #define IDLE_TIME_SECONDS 30
 #define PLYMOUTH_REQUEST_KEY "K\2\2\3"
@@ -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;
@@ -102,16 +105,21 @@ static double compute_percent(int pass, size_t cur, size_t max) {
 }
 
 static int request_cancel_client(Client *current) {
-        FsckdMessage cancel_msg;
+        FsckdMessage cancel_msg = {
+                .cancel = 1,
+        };
+
         ssize_t n;
-        cancel_msg.cancel = 1;
 
         n = send(current->fd, &cancel_msg, sizeof(FsckdMessage), 0);
-        if (n < 0 || (size_t) n < sizeof(FsckdMessage))
-                return log_warning_errno(n, "Cannot send cancel to fsck on (%u, %u): %m",
-                                         major(current->devnum), minor(current->devnum));
-        else
-                current->cancelled = true;
+        if (n < 0)
+                return log_warning_errno(errno, "Cannot send cancel to fsck on (%u:%u): %m", major(current->devnum), minor(current->devnum));
+        if ((size_t) n < sizeof(FsckdMessage)) {
+                log_warning("Short send when sending cancel to fsck on (%u:%u).", major(current->devnum), minor(current->devnum));
+                return -EIO;
+        }
+
+        current->cancelled = true;
         return 0;
 }
 
@@ -121,7 +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;
 }
@@ -130,24 +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;
@@ -155,7 +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)
@@ -163,31 +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");
@@ -195,7 +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;
 }
@@ -227,6 +251,7 @@ static int update_global_progress(Manager *m) {
                                       "Checking in progress on %d disks (%3.1f%% complete)", m->numdevices),
                                       m->numdevices, m->percent) < 0)
                         return -ENOMEM;
+
                 if (asprintf(&fsck_message, "fsckd:%d:%3.1f:%s", m->numdevices, m->percent, console_message) < 0)
                         return -ENOMEM;
 
@@ -252,23 +277,29 @@ static int connect_plymouth(Manager *m) {
         int r;
 
         /* try to connect or reconnect if sending a message */
-        if (m->plymouth_fd <= 0) {
-                m->plymouth_fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0);
-                if (m->plymouth_fd < 0) {
-                        return log_warning_errno(errno, "Connection to plymouth socket failed: %m");
-                }
-                if (connect(m->plymouth_fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
-                        on_plymouth_disconnect(m);
-                        return log_warning_errno(errno, "Couldn't connect to plymouth: %m");
-                }
-                r = sd_event_add_io(m->event, NULL, m->plymouth_fd, EPOLLIN, plymouth_feedback_handler, m);
-                if (r < 0) {
-                        on_plymouth_disconnect(m);
-                        return log_warning_errno(r, "Can't listen to plymouth socket: %m");
-                }
+        if (m->plymouth_fd >= 0)
+                return 0;
+
+        m->plymouth_fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0);
+        if (m->plymouth_fd < 0)
+                return log_warning_errno(errno, "Connection to plymouth socket failed: %m");
+
+        if (connect(m->plymouth_fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
+                r = log_warning_errno(errno, "Couldn't connect to plymouth: %m");
+                goto fail;
+        }
+
+        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;
         }
 
         return 0;
+
+fail:
+        plymouth_disconnect(m);
+        return r;
 }
 
 static int progress_handler(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
@@ -377,8 +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);
 
@@ -514,41 +547,43 @@ int main(int argc, char *argv[]) {
 
         r = parse_argv(argc, argv);
         if (r <= 0)
-                return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+                goto finish;
 
         n = sd_listen_fds(0);
         if (n > 1) {
                 log_error("Too many file descriptors received.");
-                return EXIT_FAILURE;
+                r = -EINVAL;
+                goto finish;
         } else if (n == 1)
                 fd = SD_LISTEN_FDS_START + 0;
         else {
                 fd = make_socket_fd(LOG_DEBUG, FSCKD_SOCKET_PATH, SOCK_STREAM | SOCK_CLOEXEC);
                 if (fd < 0) {
-                        log_error_errno(fd, "Couldn't create listening socket fd on %s: %m", FSCKD_SOCKET_PATH);
-                        return EXIT_FAILURE;
+                        r = log_error_errno(fd, "Couldn't create listening socket fd on %s: %m", FSCKD_SOCKET_PATH);
+                        goto finish;
                 }
         }
 
         r = manager_new(&m, fd);
         if (r < 0) {
                 log_error_errno(r, "Failed to allocate manager: %m");
-                return EXIT_FAILURE;
+                goto finish;
         }
 
         r = sd_event_add_io(m->event, NULL, fd, EPOLLIN, new_connection_handler, m);
         if (r < 0) {
                 log_error_errno(r, "Can't listen to connection socket: %m");
-                return EXIT_FAILURE;
+                goto finish;
         }
 
         r = run_event_loop_with_timeout(m->event, IDLE_TIME_SECONDS * USEC_PER_SEC);
         if (r < 0) {
                 log_error_errno(r, "Failed to run event loop: %m");
-                return EXIT_FAILURE;
+                goto finish;
         }
 
         sd_event_get_exit_code(m->event, &r);
 
+finish:
         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 }