machine-id: only look into KVM uuid when we are not running in a

[elogind.git] / src / core / machine-id-setup.c

diff --git a/src/core/machine-id-setup.c b/src/core/machine-id-setup.c
index f3b1b318e1bad88825253293ceee81912091a028..2a58e48d6f191d9ff42a5903bc0984be4c6c12c1 100644 (file)
--- a/src/core/machine-id-setup.c
+++ b/src/core/machine-id-setup.c
@@ -36,6 +36,7 @@
 #include "log.h"
 #include "virt.h"
 #include "fileio.h"
+#include "path-util.h"
 
 static int shorten_uuid(char destination[36], const char *source) {
         unsigned i, j;
@@ -77,7 +78,7 @@ static int generate(char id[34], const char *root) {
         fd = open(dbus_machine_id, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
         if (fd >= 0) {
                 k = loop_read(fd, id, 33, false);
-                close_nointr_nofail(fd);
+                safe_close(fd);
 
                 if (k == 33 && id[32] == '\n') {
 
@@ -92,32 +93,9 @@ static int generate(char id[34], const char *root) {
                 }
         }
 
-        /* If that didn't work, see if we are running in qemu/kvm and a
-         * machine ID was passed in via -uuid on the qemu/kvm command
-         * line */
-
-        r = detect_vm(&vm_id);
-        if (r > 0 && streq(vm_id, "kvm")) {
-                char uuid[37];
-
-                fd = open("/sys/class/dmi/id/product_uuid", O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
-                if (fd >= 0) {
-                        k = loop_read(fd, uuid, 36, false);
-                        close_nointr_nofail(fd);
-
-                        if (k >= 36) {
-                                r = shorten_uuid(id, uuid);
-                                if (r >= 0) {
-                                        log_info("Initializing machine ID from KVM UUID.");
-                                        return 0;
-                                }
-                        }
-                }
-        }
-
-        /* If that didn't work either, see if we are running in a
-         * container, and a machine ID was passed in via
-         * $container_uuid the way libvirt/LXC does it */
+        /* If that didn't work, see if we are running in a container,
+         * and a machine ID was passed in via $container_uuid the way
+         * libvirt/LXC does it */
         r = detect_container(NULL);
         if (r > 0) {
                 _cleanup_free_ char *e = NULL;
@@ -132,6 +110,30 @@ static int generate(char id[34], const char *root) {
                                 }
                         }
                 }
+
+        } else {
+                /* If we are not running in a container, see if we are
+                 * running in qemu/kvm and a machine ID was passed in
+                 * via -uuid on the qemu/kvm command line */
+
+                r = detect_vm(&vm_id);
+                if (r > 0 && streq(vm_id, "kvm")) {
+                        char uuid[37];
+
+                        fd = open("/sys/class/dmi/id/product_uuid", O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
+                        if (fd >= 0) {
+                                k = loop_read(fd, uuid, 36, false);
+                                safe_close(fd);
+
+                                if (k >= 36) {
+                                        r = shorten_uuid(id, uuid);
+                                        if (r >= 0) {
+                                                log_info("Initializing machine ID from KVM UUID.");
+                                                return 0;
+                                        }
+                                }
+                        }
+                }
         }
 
         /* If that didn't work, generate a random machine id */
@@ -160,14 +162,13 @@ int machine_id_setup(const char *root) {
         bool writable = false;
         struct stat st;
         char id[34]; /* 32 + \n + \0 */
-        _cleanup_free_ char *etc_machine_id = NULL;
-        _cleanup_free_ char *run_machine_id = NULL;
+        char *etc_machine_id, *run_machine_id;
 
-        if (asprintf(&etc_machine_id, "%s/etc/machine-id", root) < 0)
-                return log_oom();
+        etc_machine_id = strappenda(root, "/etc/machine-id");
+        path_kill_slashes(etc_machine_id);
 
-        if (asprintf(&run_machine_id, "%s/run/machine-id", root) < 0)
-                return log_oom();
+        run_machine_id = strappenda(root, "/run/machine-id");
+        path_kill_slashes(run_machine_id);
 
         RUN_WITH_UMASK(0000) {
                 /* We create this 0444, to indicate that this isn't really
@@ -216,8 +217,7 @@ int machine_id_setup(const char *root) {
                         return 0;
         }
 
-        close_nointr_nofail(fd);
-        fd = -1;
+        fd = safe_close(fd);
 
         /* Hmm, we couldn't write it? So let's write it to
          * /run/machine-id as a replacement */