From 288ad97878af53c220e65c0a0434a35a7be7c6dc Mon Sep 17 00:00:00 2001
From: Atomei Alexandru Constantin <atomeialexandru03@gmail.com>
Date: Sun, 7 Jan 2024 23:39:33 +0200
Subject: [PATCH] Made cksum to return an error if the algorithm blake2b is
 used on a directory

---
 src/uu/cksum/src/cksum.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/uu/cksum/src/cksum.rs b/src/uu/cksum/src/cksum.rs
index e8d7da60e..77f274944 100644
--- a/src/uu/cksum/src/cksum.rs
+++ b/src/uu/cksum/src/cksum.rs
@@ -169,6 +169,13 @@ where
             (ALGORITHM_OPTIONS_CRC, true) => println!("{sum} {sz}"),
             (ALGORITHM_OPTIONS_CRC, false) => println!("{sum} {sz} {}", filename.display()),
             (ALGORITHM_OPTIONS_BLAKE2B, _) if !options.untagged => {
+                if filename.is_dir() {
+                    return Err(io::Error::new(
+                        io::ErrorKind::InvalidInput,
+                        format!("{}: Is a directory", filename.display()),
+                    )
+                    .into());
+                }
                 if let Some(length) = options.length {
                     // Multiply by 8 here, as we want to print the length in bits.
                     println!("BLAKE2b-{} ({}) = {sum}", length * 8, filename.display());