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os-util: return earlier when extension release file is found
No functional change, just refactoring.
This commit is contained in:
parent
a84677e0f4
commit
7213c75045
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@ -162,82 +162,83 @@ int open_extension_release(
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return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "The extension name %s is invalid.", extension);
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extension_full_path = strjoina(image_class_release_info[image_class].release_file_path_prefix, extension);
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r = chase(extension_full_path, root, CHASE_PREFIX_ROOT, ret_path ? &q : NULL, ret_fd ? &fd : NULL);
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r = chase(extension_full_path, root, CHASE_PREFIX_ROOT, ret_path, ret_fd);
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log_full_errno_zerook(LOG_DEBUG, MIN(r, 0), "Checking for %s: %m", extension_full_path);
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if (r != -ENOENT)
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return r;
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/* Cannot find the expected extension-release file? The image filename might have been mangled on
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* deployment, so fallback to checking for any file in the extension-release.d directory, and return
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* the first one with a user.extension-release xattr instead. The user.extension-release.strict
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* xattr is checked to ensure the author of the image considers it OK if names do not match. */
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if (r == -ENOENT) {
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_cleanup_free_ char *extension_release_dir_path = NULL;
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_cleanup_closedir_ DIR *extension_release_dir = NULL;
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r = chase_and_opendir(image_class_release_info[image_class].release_file_directory, root, CHASE_PREFIX_ROOT,
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&extension_release_dir_path, &extension_release_dir);
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if (r < 0)
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return log_debug_errno(r, "Cannot open %s%s, ignoring: %m", root, image_class_release_info[image_class].release_file_directory);
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_cleanup_free_ char *extension_release_dir_path = NULL;
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_cleanup_closedir_ DIR *extension_release_dir = NULL;
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r = -ENOENT;
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FOREACH_DIRENT(de, extension_release_dir, return -errno) {
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int k;
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r = chase_and_opendir(image_class_release_info[image_class].release_file_directory, root, CHASE_PREFIX_ROOT,
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&extension_release_dir_path, &extension_release_dir);
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if (r < 0)
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return log_debug_errno(r, "Cannot open %s%s, ignoring: %m", root, image_class_release_info[image_class].release_file_directory);
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if (!IN_SET(de->d_type, DT_REG, DT_UNKNOWN))
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r = -ENOENT;
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FOREACH_DIRENT(de, extension_release_dir, return -errno) {
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int k;
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if (!IN_SET(de->d_type, DT_REG, DT_UNKNOWN))
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continue;
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const char *image_name = startswith(de->d_name, "extension-release.");
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if (!image_name)
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continue;
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if (!image_name_is_valid(image_name)) {
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log_debug("%s/%s is not a valid release file name, ignoring.",
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extension_release_dir_path, de->d_name);
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continue;
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}
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/* We already chased the directory, and checked that this is a real file, so we shouldn't
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* fail to open it. */
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_cleanup_close_ int extension_release_fd = openat(dirfd(extension_release_dir),
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de->d_name,
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O_PATH|O_CLOEXEC|O_NOFOLLOW);
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if (extension_release_fd < 0)
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return log_debug_errno(errno,
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"Failed to open release file %s/%s: %m",
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extension_release_dir_path,
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de->d_name);
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/* Really ensure it is a regular file after we open it. */
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if (fd_verify_regular(extension_release_fd) < 0) {
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log_debug("%s/%s is not a regular file, ignoring.", extension_release_dir_path, de->d_name);
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continue;
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}
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if (!relax_extension_release_check) {
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k = extension_release_strict_xattr_value(extension_release_fd,
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extension_release_dir_path,
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de->d_name);
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if (k != 0)
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continue;
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}
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const char *image_name = startswith(de->d_name, "extension-release.");
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if (!image_name)
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continue;
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/* We already found what we were looking for, but there's another candidate? We treat this as
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* an error, as we want to enforce that there are no ambiguities in case we are in the
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* fallback path. */
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if (r == 0) {
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r = -ENOTUNIQ;
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break;
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}
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if (!image_name_is_valid(image_name)) {
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log_debug("%s/%s is not a valid release file name, ignoring.",
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extension_release_dir_path, de->d_name);
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continue;
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}
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r = 0; /* Found it! */
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/* We already chased the directory, and checked that
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* this is a real file, so we shouldn't fail to open it. */
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_cleanup_close_ int extension_release_fd = openat(dirfd(extension_release_dir),
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de->d_name,
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O_PATH|O_CLOEXEC|O_NOFOLLOW);
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if (extension_release_fd < 0)
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return log_debug_errno(errno,
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"Failed to open release file %s/%s: %m",
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extension_release_dir_path,
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de->d_name);
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if (ret_fd)
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fd = TAKE_FD(extension_release_fd);
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/* Really ensure it is a regular file after we open it. */
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if (fd_verify_regular(extension_release_fd) < 0) {
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log_debug("%s/%s is not a regular file, ignoring.", extension_release_dir_path, de->d_name);
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continue;
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}
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if (!relax_extension_release_check) {
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k = extension_release_strict_xattr_value(extension_release_fd,
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extension_release_dir_path,
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de->d_name);
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if (k != 0)
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continue;
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}
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/* We already found what we were looking for, but there's another candidate?
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* We treat this as an error, as we want to enforce that there are no ambiguities
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* in case we are in the fallback path. */
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if (r == 0) {
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r = -ENOTUNIQ;
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break;
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}
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r = 0; /* Found it! */
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if (ret_fd)
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fd = TAKE_FD(extension_release_fd);
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if (ret_path) {
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q = path_join(extension_release_dir_path, de->d_name);
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if (!q)
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return -ENOMEM;
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}
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if (ret_path) {
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q = path_join(extension_release_dir_path, de->d_name);
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if (!q)
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return -ENOMEM;
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}
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}
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if (r < 0)
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