From 9c52ca8d55deacb07d4922664aa104283a4ba8dc Mon Sep 17 00:00:00 2001
From: Sylvestre Ledru <sylvestre@debian.org>
Date: Wed, 15 May 2024 11:46:58 +0200
Subject: [PATCH] cksum: also handle the case when the line start with ' \'

---
 src/uu/cksum/src/cksum.rs   |  2 +-
 tests/by-util/test_cksum.rs | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/src/uu/cksum/src/cksum.rs b/src/uu/cksum/src/cksum.rs
index 8645f2d4e..6e244d375 100644
--- a/src/uu/cksum/src/cksum.rs
+++ b/src/uu/cksum/src/cksum.rs
@@ -422,7 +422,7 @@ where
     // 1. <algo>[-<bits>] (<filename>) = <checksum>
     //    algo must be uppercase or b (for blake2b)
     // 2. <checksum> [* ]<filename>
-    let regex_pattern = r"^(?P<algo>[A-Z0-9b]+)(-(?P<bits>\d+))?\s?\((?P<filename1>.*)\) = (?P<checksum1>[a-fA-F0-9]+)$|^(?P<checksum2>[a-fA-F0-9]+)\s[* ](?P<filename2>.*)";
+    let regex_pattern = r"^\s*\\?(?P<algo>[A-Z0-9b]+)(-(?P<bits>\d+))?\s?\((?P<filename1>.*)\) = (?P<checksum1>[a-fA-F0-9]+)$|^(?P<checksum2>[a-fA-F0-9]+)\s[* ](?P<filename2>.*)";
     let re = Regex::new(regex_pattern).unwrap();
 
     // if cksum has several input files, it will print the result for each file
diff --git a/tests/by-util/test_cksum.rs b/tests/by-util/test_cksum.rs
index bdb044899..9072aff86 100644
--- a/tests/by-util/test_cksum.rs
+++ b/tests/by-util/test_cksum.rs
@@ -809,6 +809,25 @@ fn test_cksum_check_space() {
         .stderr_contains("line is improperly formatted");
 }
 
+#[test]
+fn test_cksum_check_leading_info() {
+    let scene = TestScenario::new(util_name!());
+    let at = &scene.fixtures;
+
+    at.touch("f");
+    at.write("CHECKSUM", "\
+     \\SHA384 (f) = 38b060a751ac96384cd9327eb1b1e36a21fdb71114be07434c0cc7bf63f6e1da274edebfe76f65fbd51ad2f14898b95b\n\
+     \\BLAKE2b (f) = 786a02f742015903c6c6fd852552d272912f4740e15847618a86e217f71f5419d25e1031afee585313896444934eb04b903a685b1448b755d56f701afe9be2ce\n\
+     \\BLAKE2b-384 (f) = b32811423377f52d7862286ee1a72ee540524380fda1724a6f25d7978c6fd3244a6caf0498812673c5e05ef583825100\n\
+     \\SM3 (f) = 1ab21d8355cfa17f8e61194831e81a8f22bec8c728fefb747ed035eb5082aa2b\n");
+    scene
+        .ucmd()
+        .arg("--check")
+        .arg("CHECKSUM")
+        .succeeds()
+        .stdout_contains("f: OK\nf: OK\nf: OK\nf: OK\n");
+}
+
 #[test]
 fn test_cksum_check() {
     let scene = TestScenario::new(util_name!());