File _service:tar_scm:backport-dns-domain-re-introdu... of Package systemd

File _service:tar_scm:backport-dns-domain-re-introduce-dns_name_is_empty.patch of Package systemd

From 435a9af906c02d8024811311b012c9d7a2400009 Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Mon, 24 Jan 2022 06:06:55 +0900
Subject: [PATCH] dns-domain: re-introduce dns_name_is_empty()

(cherry picked from commit 7bdf41983044268b4bc2f9d34462db7f89ba284a)
(cherry picked from commit df08c12062dfd9903edec371598412a47a3055e0)

Conflict:NA
Reference:https://github.com/systemd/systemd/commit/435a9af906c02d8024811311b012c9d7a2400009
---
 src/shared/dns-domain.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/shared/dns-domain.h b/src/shared/dns-domain.h
index c25fcaacc2..24bf00bd58 100644
--- a/src/shared/dns-domain.h
+++ b/src/shared/dns-domain.h
@@ -60,6 +60,10 @@ static inline int dns_name_is_valid_ldh(const char *s) {
         return 1;
 }
 
+static inline bool dns_name_is_empty(const char *s) {
+        return isempty(s) || streq(s, ".");
+}
+
 void dns_name_hash_func(const char *s, struct siphash *state);
 int dns_name_compare_func(const char *a, const char *b);
 extern const struct hash_ops dns_name_hash_ops;
-- 
2.33.0