checksum: Unify the handling of check-only flags

src/uu/cksum/src/cksum.rs

@@ -140,6 +140,20 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
 
     let check = matches.get_flag(options::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(options::IGNORE_MISSING)?;
+    let warn = check_flag(options::WARN)?;
+    let quiet = check_flag(options::QUIET)?;
+    let strict = check_flag(options::STRICT)?;
+    let status = check_flag(options::STATUS)?;
+
     let algo_cli = matches
         .get_one::<String>(options::ALGORITHM)
         .map(AlgoKind::from_cksum)
@@ -166,11 +180,6 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
 
         let text_flag = matches.get_flag(options::TEXT);
         let binary_flag = matches.get_flag(options::BINARY);
-        let strict = matches.get_flag(options::STRICT);
-        let status = matches.get_flag(options::STATUS);
-        let warn = matches.get_flag(options::WARN);
-        let ignore_missing = matches.get_flag(options::IGNORE_MISSING);
-        let quiet = matches.get_flag(options::QUIET);
         let tag = matches.get_flag(options::TAG);
 
         if tag || binary_flag || text_flag {
@@ -191,6 +200,11 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
 
     // Not --check
 
+    // Print hardware debug info if requested
+    if matches.get_flag(options::DEBUG) {
+        print_cpu_debug_info();
+    }
+
     // Set the default algorithm to CRC when not '--check'ing.
     let algo_kind = algo_cli.unwrap_or(AlgoKind::Crc);
 
@@ -199,22 +213,15 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
     let algo = SizedAlgoKind::from_unsized(algo_kind, length)?;
     let line_ending = LineEnding::from_zero_flag(matches.get_flag(options::ZERO));
 
-    let output_format = figure_out_output_format(
-        algo,
-        tag,
-        binary,
-        matches.get_flag(options::RAW),
-        matches.get_flag(options::BASE64),
-    );
-
-    // Print hardware debug info if requested
-    if matches.get_flag(options::DEBUG) {
-        print_cpu_debug_info();
-    }
-
     let opts = ChecksumComputeOptions {
         algo_kind: algo,
-        output_format,
+        output_format: figure_out_output_format(
+            algo,
+            tag,
+            binary,
+            matches.get_flag(options::RAW),
+            matches.get_flag(options::BASE64),
+        ),
         line_ending,
     };
 

src/uu/hashsum/src/hashsum.rs

@@ -164,16 +164,27 @@ pub fn uumain(mut args: impl uucore::Args) -> UResult<()> {
         binary_flag_default
     };
     let check = matches.get_flag("check");
-    let status = matches.get_flag("status");
-    let quiet = matches.get_flag("quiet");
-    let strict = matches.get_flag("strict");
-    let warn = matches.get_flag("warn");
-    let ignore_missing = matches.get_flag("ignore-missing");
 
-    if ignore_missing && !check {
-        // --ignore-missing needs -c
-        return Err(ChecksumError::IgnoreNotCheck.into());
-    }
+    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 files = matches.get_many::<OsString>(options::FILE).map_or_else(
+        // No files given, read from stdin.
+        || Box::new(iter::once(OsStr::new("-"))) as Box<dyn Iterator<Item = &OsStr>>,
+        // At least one file given, read from them.
+        |files| Box::new(files.map(OsStr::new)) as Box<dyn Iterator<Item = &OsStr>>,
+    );
 
     if check {
         // on Windows, allow --binary/--text to be used with --check
@@ -188,13 +199,6 @@ pub fn uumain(mut args: impl uucore::Args) -> UResult<()> {
             }
         }
 
-        // Execute the checksum validation based on the presence of files or the use of stdin
-        // Determine the source of input: a list of files or stdin.
-        let input = matches.get_many::<OsString>(options::FILE).map_or_else(
-            || iter::once(OsStr::new("-")).collect::<Vec<_>>(),
-            |files| files.map(OsStr::new).collect::<Vec<_>>(),
-        );
-
         let verbose = ChecksumVerbose::new(status, quiet, warn);
 
         let opts = ChecksumValidateOptions {
@@ -204,16 +208,11 @@ pub fn uumain(mut args: impl uucore::Args) -> UResult<()> {
         };
 
         // Execute the checksum validation
-        return perform_checksum_validation(input.iter().copied(), Some(algo_kind), length, opts);
-    } else if quiet {
-        return Err(ChecksumError::QuietNotCheck.into());
-    } else if strict {
-        return Err(ChecksumError::StrictNotCheck.into());
+        return perform_checksum_validation(files, Some(algo_kind), length, opts);
     }
 
-    let line_ending = LineEnding::from_zero_flag(matches.get_flag("zero"));
-
     let algo = SizedAlgoKind::from_unsized(algo_kind, length)?;
+    let line_ending = LineEnding::from_zero_flag(matches.get_flag("zero"));
 
     let opts = ChecksumComputeOptions {
         algo_kind: algo,
@@ -227,13 +226,6 @@ pub fn uumain(mut args: impl uucore::Args) -> UResult<()> {
         line_ending,
     };
 
-    let files = matches.get_many::<OsString>(options::FILE).map_or_else(
-        // No files given, read from stdin.
-        || Box::new(iter::once(OsStr::new("-"))) as Box<dyn Iterator<Item = &OsStr>>,
-        // At least one file given, read from them.
-        |files| Box::new(files.map(OsStr::new)) as Box<dyn Iterator<Item = &OsStr>>,
-    );
-
     // Show the hashsum of the input
     perform_checksum_computation(opts, files)
 }

src/uucore/src/lib/features/checksum/mod.rs

@@ -373,12 +373,9 @@ impl SizedAlgoKind {
 pub enum ChecksumError {
     #[error("the --raw option is not supported with multiple files")]
     RawMultipleFiles,
-    #[error("the --ignore-missing option is meaningful only when verifying checksums")]
-    IgnoreNotCheck,
-    #[error("the --strict option is meaningful only when verifying checksums")]
-    StrictNotCheck,
-    #[error("the --quiet option is meaningful only when verifying checksums")]
-    QuietNotCheck,
+
+    #[error("the --{0} option is meaningful only when verifying checksums")]
+    CheckOnlyFlag(String),
 
     // --length sanitization errors
     #[error("--length required for {}", .0.quote())]