X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fcore%2Fmachine-id-setup.c;h=1b55da7e56b8b6117b3418d6414444b3bad7c4f0;hb=3772995afa7df42c3a332fb085a27cb5d266b893;hp=fbba3aab78d0f0073a65b34d7374cb8a8c7f24c0;hpb=5c0d398dfc4d79df2209515d28cafd9dc129838e;p=elogind.git

diff --git a/src/core/machine-id-setup.c b/src/core/machine-id-setup.c
index fbba3aab7..1b55da7e5 100644
--- a/src/core/machine-id-setup.c
+++ b/src/core/machine-id-setup.c
@@ -72,16 +72,19 @@ static int generate(char id[34]) {
         /* First, try reading the D-Bus machine id, unless it is a symlink */
         fd = open("/var/lib/dbus/machine-id", O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
         if (fd >= 0) {
-
-                k = loop_read(fd, id, 32, false);
+                k = loop_read(fd, id, 33, false);
                 close_nointr_nofail(fd);
 
-                if (k >= 32) {
-                        id[32] = '\n';
-                        id[33] = 0;
+                if (k == 33 && id[32] == '\n') {
 
-                        log_info("Initializing machine ID from D-Bus machine ID.");
-                        return 0;
+                        id[32] = 0;
+                        if (id128_is_valid(id)) {
+                                id[32] = '\n';
+                                id[33] = 0;
+
+                                log_info("Initializing machine ID from D-Bus machine ID.");
+                                return 0;
+                        }
                 }
         }
 
@@ -113,7 +116,7 @@ static int generate(char id[34]) {
          * $container_uuid the way libvirt/LXC does it */
         r = detect_container(NULL);
         if (r > 0) {
-                char *e;
+                _cleanup_free_ char *e = NULL;
 
                 r = getenv_for_pid(1, "container_uuid", &e);
                 if (r > 0) {
@@ -121,12 +124,9 @@ static int generate(char id[34]) {
                                 r = shorten_uuid(id, e);
                                 if (r >= 0) {
                                         log_info("Initializing machine ID from container UUID.");
-                                        free(e);
                                         return 0;
                                 }
                         }
-
-                        free(e);
                 }
         }
 
@@ -151,8 +151,9 @@ static int generate(char id[34]) {
 }
 
 int machine_id_setup(void) {
-        int fd, r;
-        bool writable;
+        _cleanup_close_ int fd = -1;
+        int r;
+        bool writable = false;
         struct stat st;
         char id[34]; /* 32 + \n + \0 */
 
@@ -178,31 +179,29 @@ int machine_id_setup(void) {
 
         if (fstat(fd, &st) < 0) {
                 log_error("fstat() failed: %m");
-                r = -errno;
-                goto finish;
+                return -errno;
         }
 
-        if (S_ISREG(st.st_mode)) {
-                if (loop_read(fd, id, 32, false) >= 32) {
-                        r = 0;
-                        goto finish;
+        if (S_ISREG(st.st_mode))
+                if (loop_read(fd, id, 33, false) == 33 && id[32] == '\n') {
+                        id[32] = 0;
+
+                        if (id128_is_valid(id))
+                                return 0;
                 }
-        }
 
         /* Hmm, so, the id currently stored is not useful, then let's
          * generate one */
 
         r = generate(id);
         if (r < 0)
-                goto finish;
+                return r;
 
         if (S_ISREG(st.st_mode) && writable) {
                 lseek(fd, 0, SEEK_SET);
 
-                if (loop_write(fd, id, 33, false) == 33) {
-                        r = 0;
-                        goto finish;
-                }
+                if (loop_write(fd, id, 33, false) == 33)
+                        return 0;
         }
 
         close_nointr_nofail(fd);
@@ -216,29 +215,23 @@ int machine_id_setup(void) {
         }
         if (r < 0) {
                 log_error("Cannot write /run/machine-id: %s", strerror(-r));
-
                 unlink("/run/machine-id");
-                goto finish;
+                return r;
         }
 
         /* And now, let's mount it over */
-        r = mount("/run/machine-id", "/etc/machine-id", NULL, MS_BIND, NULL) < 0 ? -errno : 0;
+        r = mount("/run/machine-id", "/etc/machine-id", NULL, MS_BIND, NULL);
         if (r < 0) {
-                unlink("/run/machine-id");
-                log_error("Failed to mount /etc/machine-id: %s", strerror(-r));
-        } else {
-                log_info("Installed transient /etc/machine-id file.");
-
-                /* Mark the mount read-only */
-                if (mount(NULL, "/etc/machine-id", NULL,
-                          MS_BIND|MS_RDONLY|MS_REMOUNT, NULL) < 0)
-                        log_warning("Failed to make transient /etc/machine-id read-only");
+                log_error("Failed to mount /etc/machine-id: %m");
+                unlink_noerrno("/run/machine-id");
+                return -errno;
         }
 
-finish:
+        log_info("Installed transient /etc/machine-id file.");
 
-        if (fd >= 0)
-                close_nointr_nofail(fd);
+        /* Mark the mount read-only */
+        if (mount(NULL, "/etc/machine-id", NULL, MS_BIND|MS_RDONLY|MS_REMOUNT, NULL) < 0)
+                log_warning("Failed to make transient /etc/machine-id read-only: %m");
 
-        return r;
+        return 0;
 }