X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fcore%2Fmachine-id-setup.c;h=fbba3aab78d0f0073a65b34d7374cb8a8c7f24c0;hb=ee531d949c2f62374fc109252f8cbe61c2b8ee39;hp=146c5653c96af4b91ac12ed5b268684429136c3a;hpb=10d18763ec6f31ded1535f810be765f7fab2d97d;p=elogind.git

diff --git a/src/core/machine-id-setup.c b/src/core/machine-id-setup.c
index 146c5653c..fbba3aab7 100644
--- a/src/core/machine-id-setup.c
+++ b/src/core/machine-id-setup.c
@@ -155,31 +155,27 @@ int machine_id_setup(void) {
         bool writable;
         struct stat st;
         char id[34]; /* 32 + \n + \0 */
-        mode_t m;
 
-        m = umask(0000);
-
-        /* We create this 0444, to indicate that this isn't really
-         * something you should ever modify. Of course, since the file
-         * will be owned by root it doesn't matter much, but maybe
-         * people look. */
+        RUN_WITH_UMASK(0000) {
+                /* We create this 0444, to indicate that this isn't really
+                 * something you should ever modify. Of course, since the file
+                 * will be owned by root it doesn't matter much, but maybe
+                 * people look. */
+
+                fd = open("/etc/machine-id", O_RDWR|O_CREAT|O_CLOEXEC|O_NOCTTY, 0444);
+                if (fd >= 0)
+                        writable = true;
+                else {
+                        fd = open("/etc/machine-id", O_RDONLY|O_CLOEXEC|O_NOCTTY);
+                        if (fd < 0) {
+                                log_error("Cannot open /etc/machine-id: %m");
+                                return -errno;
+                        }
 
-        fd = open("/etc/machine-id", O_RDWR|O_CREAT|O_CLOEXEC|O_NOCTTY, 0444);
-        if (fd >= 0)
-                writable = true;
-        else {
-                fd = open("/etc/machine-id", O_RDONLY|O_CLOEXEC|O_NOCTTY);
-                if (fd < 0) {
-                        umask(m);
-                        log_error("Cannot open /etc/machine-id: %m");
-                        return -errno;
+                        writable = false;
                 }
-
-                writable = false;
         }
 
-        umask(m);
-
         if (fstat(fd, &st) < 0) {
                 log_error("fstat() failed: %m");
                 r = -errno;
@@ -215,10 +211,9 @@ int machine_id_setup(void) {
         /* Hmm, we couldn't write it? So let's write it to
          * /run/machine-id as a replacement */
 
-        m = umask(0022);
-        r = write_one_line_file("/run/machine-id", id);
-        umask(m);
-
+        RUN_WITH_UMASK(0022) {
+                r = write_string_file("/run/machine-id", id);
+        }
         if (r < 0) {
                 log_error("Cannot write /run/machine-id: %s", strerror(-r));