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fix broken symlink resolving
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parent
c68a293678
commit
44589a0c73
@ -40,6 +40,39 @@ struct sysfs_attr {
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char value_local[UTIL_NAME_SIZE];
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};
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static int resolve_sys_link(struct udev *udev, char *path, size_t size)
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{
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char link_path[UTIL_PATH_SIZE];
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char link_target[UTIL_PATH_SIZE];
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int len;
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int i;
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int back;
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util_strlcpy(link_path, udev_get_sys_path(udev), sizeof(link_path));
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util_strlcat(link_path, path, sizeof(link_path));
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len = readlink(link_path, link_target, sizeof(link_target));
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if (len <= 0)
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return -1;
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link_target[len] = '\0';
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dbg(udev, "path link '%s' points to '%s'\n", path, link_target);
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for (back = 0; strncmp(&link_target[back * 3], "../", 3) == 0; back++)
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;
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dbg(udev, "base '%s', tail '%s', back %i\n", path, &link_target[back * 3], back);
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for (i = 0; i <= back; i++) {
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char *pos = strrchr(path, '/');
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if (pos == NULL)
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return -1;
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pos[0] = '\0';
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}
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dbg(udev, "after moving back '%s'\n", path);
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util_strlcat(path, "/", size);
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util_strlcat(path, &link_target[back * 3], size);
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return 0;
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}
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int sysfs_init(void)
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{
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INIT_LIST_HEAD(&dev_list);
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@ -144,7 +177,7 @@ struct sysfs_device *sysfs_device_get(struct udev *udev, const char *devpath)
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return NULL;
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}
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if (S_ISLNK(statbuf.st_mode)) {
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if (util_resolve_sys_link(udev, devpath_real, sizeof(devpath_real)) != 0)
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if (resolve_sys_link(udev, devpath_real, sizeof(devpath_real)) != 0)
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return NULL;
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/* now look for device in cache after path translation */
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@ -258,7 +291,7 @@ struct sysfs_device *sysfs_device_get_parent(struct udev *udev, struct sysfs_dev
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device_link:
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util_strlcpy(parent_devpath, dev->devpath, sizeof(parent_devpath));
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util_strlcat(parent_devpath, "/device", sizeof(parent_devpath));
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if (util_resolve_sys_link(udev, parent_devpath, sizeof(parent_devpath)) != 0)
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if (resolve_sys_link(udev, parent_devpath, sizeof(parent_devpath)) != 0)
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return NULL;
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/* get parent and remember it */
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@ -460,7 +493,7 @@ out:
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return 0;
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found:
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if (S_ISLNK(statbuf.st_mode))
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util_resolve_sys_link(udev, path, sizeof(path_full) - sysfs_len);
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resolve_sys_link(udev, path, sizeof(path_full) - sysfs_len);
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util_strlcpy(devpath_full, path, len);
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return 1;
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}
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@ -65,7 +65,6 @@ static int delay_device(const char *devpath)
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static int device_list_insert(struct udev *udev, const char *path)
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{
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char filename[UTIL_PATH_SIZE];
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char devpath[UTIL_PATH_SIZE];
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struct stat statbuf;
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dbg(udev, "add '%s'\n" , path);
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@ -78,16 +77,15 @@ static int device_list_insert(struct udev *udev, const char *path)
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if (!(statbuf.st_mode & S_IWUSR))
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return -1;
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util_strlcpy(devpath, &path[strlen(udev_get_sys_path(udev))], sizeof(devpath));
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/* resolve possible link to real target */
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if (lstat(path, &statbuf) < 0)
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util_strlcpy(filename, path, sizeof(filename));
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if (lstat(filename, &statbuf) < 0)
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return -1;
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if (S_ISLNK(statbuf.st_mode))
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if (util_resolve_sys_link(udev, devpath, sizeof(devpath)) != 0)
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if (util_resolve_sys_link(udev, filename, sizeof(filename)) != 0)
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return -1;
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name_list_add(udev, &device_list, devpath, 1);
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name_list_add(udev, &device_list, filename, 1);
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return 0;
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}
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