man pages: replace 'device-path' by 'devpath'

[elogind.git] / udev_node.c

diff --git a/udev_node.c b/udev_node.c
index 2a30fe32223351a76ef1f594de1e9d7f48dea608..ee59d4ae7c74b0642a37d391a97d58005f26b285 100644 (file)
--- a/udev_node.c
+++ b/udev_node.c
@@ -90,6 +90,36 @@ exit:
        return retval;
 }
 
+static int udev_node_symlink(struct udevice *udev, const char *linktarget, const char *filename)
+{
+       char target[PATH_SIZE];
+       int len;
+
+       /* look if symlink already exists */
+       len = readlink(filename, target, sizeof(target));
+       if (len > 0) {
+               target[len] = '\0';
+               if (strcmp(linktarget, target) == 0) {
+                       info("preserving symlink '%s' to '%s'", filename, linktarget);
+                       selinux_setfilecon(filename, NULL, S_IFLNK);
+                       goto exit;
+               } else {
+                       info("link '%s' points to different target '%s', delete it", filename, target);
+                       unlink(filename);
+               }
+       }
+
+       /* create link */
+       info("creating symlink '%s' to '%s'", filename, linktarget);
+       selinux_setfscreatecon(filename, NULL, S_IFLNK);
+       if (symlink(linktarget, filename) != 0)
+               err("symlink(%s, %s) failed: %s", linktarget, filename, strerror(errno));
+       selinux_resetfscreatecon();
+
+exit:
+       return 0;
+}
+
 int udev_node_add(struct udevice *udev, struct udevice *udev_old)
 {
        char filename[PATH_SIZE];
@@ -205,13 +235,8 @@ int udev_node_add(struct udevice *udev, struct udevice *udev_old)
                        strlcat(linktarget, &udev->name[tail], sizeof(linktarget));
 
                        info("creating symlink '%s' to '%s'", filename, linktarget);
-                       if (!udev->test_run) {
-                               unlink(filename);
-                               selinux_setfscreatecon(filename, NULL, S_IFLNK);
-                               if (symlink(linktarget, filename) != 0)
-                                       err("symlink(%s, %s) failed: %s", linktarget, filename, strerror(errno));
-                               selinux_resetfscreatecon();
-                       }
+                       if (!udev->test_run)
+                               udev_node_symlink(udev, linktarget, filename);
 
                        strlcat(symlinks, filename, sizeof(symlinks));
                        strlcat(symlinks, " ", sizeof(symlinks));