hashsum: Move --ckeck's deps to clap

src/uu/hashsum/src/hashsum.rs

@@ -157,19 +157,11 @@ pub fn uumain(mut args: impl uucore::Args) -> UResult<()> {
     };
     let check = matches.get_flag("check");
 
-    let check_flag = |flag| match (check, matches.get_flag(flag)) {
-        (_, false) => Ok(false),
-        (true, true) => Ok(true),
-        (false, true) => Err(ChecksumError::CheckOnlyFlag(flag.into())),
-    };
-
-    // Each of the following flags are only expected in --check mode.
-    // If we encounter them otherwise, end with an error.
-    let ignore_missing = check_flag("ignore-missing")?;
-    let warn = check_flag("warn")?;
-    let quiet = check_flag("quiet")?;
-    let strict = check_flag("strict")?;
-    let status = check_flag("status")?;
+    let ignore_missing = matches.get_flag("ignore-missing");
+    let warn = matches.get_flag("warn");
+    let quiet = matches.get_flag("quiet");
+    let strict = matches.get_flag("strict");
+    let status = matches.get_flag("status");
 
     let files = matches.get_many::<OsString>(options::FILE).map_or_else(
         // No files given, read from stdin.
@@ -301,35 +293,40 @@ pub fn uu_app_common() -> Command {
                 .long(options::QUIET)
                 .help(translate!("hashsum-help-quiet"))
                 .action(ArgAction::SetTrue)
-                .overrides_with_all([options::STATUS, options::WARN]),
+                .overrides_with_all([options::STATUS, options::WARN])
+                .requires(options::CHECK),
         )
         .arg(
             Arg::new(options::STATUS)
                 .short('s')
                 .long("status")
                 .help(translate!("hashsum-help-status"))
                 .action(ArgAction::SetTrue)
-                .overrides_with_all([options::QUIET, options::WARN]),
+                .overrides_with_all([options::QUIET, options::WARN])
+                .requires(options::CHECK),
         )
         .arg(
             Arg::new(options::STRICT)
                 .long("strict")
                 .help(translate!("hashsum-help-strict"))
-                .action(ArgAction::SetTrue),
+                .action(ArgAction::SetTrue)
+                .requires(options::CHECK),
         )
         .arg(
             Arg::new("ignore-missing")
                 .long("ignore-missing")
                 .help(translate!("hashsum-help-ignore-missing"))
-                .action(ArgAction::SetTrue),
+                .action(ArgAction::SetTrue)
+                .requires(options::CHECK),
         )
         .arg(
             Arg::new(options::WARN)
                 .short('w')
                 .long("warn")
                 .help(translate!("hashsum-help-warn"))
                 .action(ArgAction::SetTrue)
-                .overrides_with_all([options::QUIET, options::STATUS]),
+                .overrides_with_all([options::QUIET, options::STATUS])
+                .requires(options::CHECK),
         )
         .arg(
             Arg::new("zero")

tests/by-util/test_hashsum.rs

@@ -268,7 +268,7 @@ fn test_check_md5_ignore_missing() {
         .arg("--ignore-missing")
         .arg(at.subdir.join("testf.sha1"))
         .fails()
-        .stderr_contains("the --ignore-missing option is meaningful only when verifying checksums");
+        .stderr_contains("the following required arguments were not provided"); //clap generated error
 }
 
 #[test]
@@ -1021,13 +1021,13 @@ fn test_check_quiet() {
         .arg("--quiet")
         .arg(at.subdir.join("in.md5"))
         .fails()
-        .stderr_contains("md5sum: the --quiet option is meaningful only when verifying checksums");
+        .stderr_contains("the following required arguments were not provided"); //clap generated error
     scene
         .ccmd("md5sum")
         .arg("--strict")
         .arg(at.subdir.join("in.md5"))
         .fails()
-        .stderr_contains("md5sum: the --strict option is meaningful only when verifying checksums");
+        .stderr_contains("the following required arguments were not provided"); //clap generated error
 }
 
 #[test]

util/build-gnu.sh

@@ -322,6 +322,8 @@ test \$n_stat1 -ge \$n_stat2 \\' tests/ls/stat-free-color.sh
 
 # no need to replicate this output with hashsum
 "${SED}" -i -e  "s|Try 'md5sum --help' for more information.\\\n||" tests/cksum/md5sum.pl
+# clap changes the error message
+ "${SED}" -i '/check-ignore-missing-4/,/EXIT=> 1/ { /ERR=>/,/try_help/d }' tests/cksum/md5sum.pl
 
 # Our ls command always outputs ANSI color codes prepended with a zero. However,
 # in the case of GNU, it seems inconsistent. Nevertheless, it looks like it