fix broken symlink resolving

diff --git a/udev/udev_sysfs.c b/udev/udev_sysfs.c
index 97dcd03..3e395a2 100644 (file)
--- a/udev/udev_sysfs.c
+++ b/udev/udev_sysfs.c
@@ -40,6 +40,39 @@ struct sysfs_attr {
        char value_local[UTIL_NAME_SIZE];
 };
 
+static int resolve_sys_link(struct udev *udev, char *path, size_t size)
+{
+       char link_path[UTIL_PATH_SIZE];
+       char link_target[UTIL_PATH_SIZE];
+
+       int len;
+       int i;
+       int back;
+
+       util_strlcpy(link_path, udev_get_sys_path(udev), sizeof(link_path));
+       util_strlcat(link_path, path, sizeof(link_path));
+       len = readlink(link_path, link_target, sizeof(link_target));
+       if (len <= 0)
+               return -1;
+       link_target[len] = '\0';
+       dbg(udev, "path link '%s' points to '%s'\n", path, link_target);
+
+       for (back = 0; strncmp(&link_target[back * 3], "../", 3) == 0; back++)
+               ;
+       dbg(udev, "base '%s', tail '%s', back %i\n", path, &link_target[back * 3], back);
+       for (i = 0; i <= back; i++) {
+               char *pos = strrchr(path, '/');
+
+               if (pos == NULL)
+                       return -1;
+               pos[0] = '\0';
+       }
+       dbg(udev, "after moving back '%s'\n", path);
+       util_strlcat(path, "/", size);
+       util_strlcat(path, &link_target[back * 3], size);
+       return 0;
+}
+
 int sysfs_init(void)
 {
        INIT_LIST_HEAD(&dev_list);
@@ -144,7 +177,7 @@ struct sysfs_device *sysfs_device_get(struct udev *udev, const char *devpath)
                return NULL;
        }
        if (S_ISLNK(statbuf.st_mode)) {
-               if (util_resolve_sys_link(udev, devpath_real, sizeof(devpath_real)) != 0)
+               if (resolve_sys_link(udev, devpath_real, sizeof(devpath_real)) != 0)
                        return NULL;
 
                /* now look for device in cache after path translation */
@@ -258,7 +291,7 @@ struct sysfs_device *sysfs_device_get_parent(struct udev *udev, struct sysfs_dev
 device_link:
        util_strlcpy(parent_devpath, dev->devpath, sizeof(parent_devpath));
        util_strlcat(parent_devpath, "/device", sizeof(parent_devpath));
-       if (util_resolve_sys_link(udev, parent_devpath, sizeof(parent_devpath)) != 0)
+       if (resolve_sys_link(udev, parent_devpath, sizeof(parent_devpath)) != 0)
                return NULL;
 
        /* get parent and remember it */
@@ -460,7 +493,7 @@ out:
        return 0;
 found:
        if (S_ISLNK(statbuf.st_mode))
-               util_resolve_sys_link(udev, path, sizeof(path_full) - sysfs_len);
+               resolve_sys_link(udev, path, sizeof(path_full) - sysfs_len);
        util_strlcpy(devpath_full, path, len);
        return 1;
 }

diff --git a/udev/udevadm-trigger.c b/udev/udevadm-trigger.c
index f0535f5..8a2c125 100644 (file)
--- a/udev/udevadm-trigger.c
+++ b/udev/udevadm-trigger.c
@@ -65,7 +65,6 @@ static int delay_device(const char *devpath)
 static int device_list_insert(struct udev *udev, const char *path)
 {
        char filename[UTIL_PATH_SIZE];
-       char devpath[UTIL_PATH_SIZE];
        struct stat statbuf;
 
        dbg(udev, "add '%s'\n" , path);
@@ -78,16 +77,15 @@ static int device_list_insert(struct udev *udev, const char *path)
        if (!(statbuf.st_mode & S_IWUSR))
                return -1;
 
-       util_strlcpy(devpath, &path[strlen(udev_get_sys_path(udev))], sizeof(devpath));
-
        /* resolve possible link to real target */
-       if (lstat(path, &statbuf) < 0)
+       util_strlcpy(filename, path, sizeof(filename));
+       if (lstat(filename, &statbuf) < 0)
                return -1;
        if (S_ISLNK(statbuf.st_mode))
-               if (util_resolve_sys_link(udev, devpath, sizeof(devpath)) != 0)
+               if (util_resolve_sys_link(udev, filename, sizeof(filename)) != 0)
                        return -1;
 
-       name_list_add(udev, &device_list, devpath, 1);
+       name_list_add(udev, &device_list, filename, 1);
        return 0;
 }