From cdf959d2a882282dd27dd53075e7c47ff704569b Mon Sep 17 00:00:00 2001
From: Sylvestre Ledru <sylvestre@debian.org>
Date: Mon, 15 Apr 2024 17:52:06 +0200
Subject: [PATCH] cksum: --tag & --untagged - the order of usage matters.
 manage it

---
 src/uu/cksum/src/cksum.rs   | 18 ++++++++++++------
 tests/by-util/test_cksum.rs | 31 +++++++++++++++++++++++++++++--
 2 files changed, 41 insertions(+), 8 deletions(-)

diff --git a/src/uu/cksum/src/cksum.rs b/src/uu/cksum/src/cksum.rs
index 4339ff33cc7..9801c3fd5e6 100644
--- a/src/uu/cksum/src/cksum.rs
+++ b/src/uu/cksum/src/cksum.rs
@@ -369,7 +369,7 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
         None
     };
 
-    if algo_name == "bsd" && check {
+    if ["bsd", "crc", "sysv"].contains(&algo_name) && check {
         return Err(io::Error::new(
             io::ErrorKind::InvalidInput,
             "--check is not supported with --algorithm={bsd,sysv,crc}",
@@ -378,9 +378,12 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
     }
 
     let untagged: bool = matches.get_flag(options::UNTAGGED);
-    let tag: bool = matches.get_flag(options::TAG);
 
-    let binary = if untagged && tag {
+    let args: Vec<String> = std::env::args().collect();
+    let binary = if args.contains(&"--tag".to_string()) && args.contains(&"--untagged".to_string())
+    {
+        // ugly workaround to detect if the two arguments have been passed at the same time
+        // clap with overrides_with
         false
     } else {
         matches.get_flag(options::BINARY)
@@ -451,13 +454,15 @@ pub fn uu_app() -> Command {
             Arg::new(options::UNTAGGED)
                 .long(options::UNTAGGED)
                 .help("create a reversed style checksum, without digest type")
-                .action(ArgAction::SetTrue),
+                .action(ArgAction::SetTrue)
+                .overrides_with(options::TAG),
         )
         .arg(
             Arg::new(options::TAG)
                 .long(options::TAG)
                 .help("create a BSD style checksum, undo --untagged (default)")
-                .action(ArgAction::SetTrue),
+                .action(ArgAction::SetTrue)
+                .overrides_with(options::UNTAGGED),
         )
         .arg(
             Arg::new(options::LENGTH)
@@ -503,7 +508,8 @@ pub fn uu_app() -> Command {
             Arg::new(options::TEXT)
                 .long(options::TEXT)
                 .short('t')
-                .hide(true) // for legacy compatibility, no action
+                .hide(true)
+                .overrides_with(options::BINARY)
                 .action(ArgAction::SetTrue),
         )
         .arg(
diff --git a/tests/by-util/test_cksum.rs b/tests/by-util/test_cksum.rs
index 31a3f52747f..40fed667428 100644
--- a/tests/by-util/test_cksum.rs
+++ b/tests/by-util/test_cksum.rs
@@ -148,7 +148,7 @@ fn test_tag_after_untagged() {
         .arg("-a=md5")
         .arg("lorem_ipsum.txt")
         .succeeds()
-        .stdout_is("cd724690f7dc61775dfac400a71f2caa  lorem_ipsum.txt\n");
+        .stdout_is_fixture("md5_single_file.expected");
 }
 
 #[test]
@@ -287,6 +287,22 @@ fn test_check_algo() {
         .no_stdout()
         .stderr_contains("cksum: --check is not supported with --algorithm={bsd,sysv,crc}")
         .code_is(1);
+    new_ucmd!()
+        .arg("-a=sysv")
+        .arg("--check")
+        .arg("lorem_ipsum.txt")
+        .fails()
+        .no_stdout()
+        .stderr_contains("cksum: --check is not supported with --algorithm={bsd,sysv,crc}")
+        .code_is(1);
+    new_ucmd!()
+        .arg("-a=crc")
+        .arg("--check")
+        .arg("lorem_ipsum.txt")
+        .fails()
+        .no_stdout()
+        .stderr_contains("cksum: --check is not supported with --algorithm={bsd,sysv,crc}")
+        .code_is(1);
 }
 
 #[test]
@@ -474,13 +490,24 @@ fn test_binary_file() {
     // no "*" in this case
     scene
         .ucmd()
-        .arg("--untagged")
         .arg("--tag")
+        .arg("--untagged")
         .arg("--binary")
         .arg("--algorithm=md5")
         .arg(at.subdir.join("f"))
         .succeeds()
         .stdout_contains("d41d8cd98f00b204e9800998ecf8427e  ");
+
+    // no "*" in this case
+    scene
+        .ucmd()
+        .arg("--tag")
+        .arg("--untagged")
+        .arg("--binary")
+        .arg("--algorithm=md5")
+        .arg("raw/blake2b_single_file.expected")
+        .succeeds()
+        .stdout_contains("7e297c07ed8e053600092f91bdd1dad7  ");
 }
 
 #[test]