du: add support of --dereference-args

Should fix tests/du/deref.sh

src/uu/du/src/du.rs

@@ -68,6 +68,7 @@ mod options {
     pub const TIME_STYLE: &str = "time-style";
     pub const ONE_FILE_SYSTEM: &str = "one-file-system";
     pub const DEREFERENCE: &str = "dereference";
+    pub const DEREFERENCE_ARGS: &str = "dereference-args";
     pub const INODES: &str = "inodes";
     pub const EXCLUDE: &str = "exclude";
     pub const EXCLUDE_FROM: &str = "exclude-from";
@@ -89,6 +90,7 @@ struct Options {
     separate_dirs: bool,
     one_file_system: bool,
     dereference: bool,
+    dereference_args: Vec<PathBuf>,
     inodes: bool,
     verbose: bool,
 }
@@ -113,7 +115,7 @@ struct Stat {
 
 impl Stat {
     fn new(path: PathBuf, options: &Options) -> Result<Self> {
-        let metadata = if options.dereference {
+        let metadata = if options.dereference || options.dereference_args.contains(&path) {
             fs::metadata(&path)?
         } else {
             fs::symlink_metadata(&path)?
@@ -505,17 +507,6 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
         summarize,
     )?;
 
-    let options = Options {
-        all: matches.get_flag(options::ALL),
-        max_depth,
-        total: matches.get_flag(options::TOTAL),
-        separate_dirs: matches.get_flag(options::SEPARATE_DIRS),
-        one_file_system: matches.get_flag(options::ONE_FILE_SYSTEM),
-        dereference: matches.get_flag(options::DEREFERENCE),
-        inodes: matches.get_flag(options::INODES),
-        verbose: matches.get_flag(options::VERBOSE),
-    };
-
     let files = match matches.get_one::<String>(options::FILE) {
         Some(_) => matches
             .get_many::<String>(options::FILE)
@@ -525,6 +516,24 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
         None => vec!["."],
     };
 
+    let options = Options {
+        all: matches.get_flag(options::ALL),
+        max_depth,
+        total: matches.get_flag(options::TOTAL),
+        separate_dirs: matches.get_flag(options::SEPARATE_DIRS),
+        one_file_system: matches.get_flag(options::ONE_FILE_SYSTEM),
+        dereference: matches.get_flag(options::DEREFERENCE),
+        dereference_args: if matches.get_flag(options::DEREFERENCE_ARGS) {
+            // Convert into a pathbuf as we will use it in a function using Pathbuf
+            // We don't care about the cost as it is rarely used
+            files.iter().map(PathBuf::from).collect()
+        } else {
+            vec![]
+        },
+        inodes: matches.get_flag(options::INODES),
+        verbose: matches.get_flag(options::VERBOSE),
+    };
+
     if options.inodes
         && (matches.get_flag(options::APPARENT_SIZE) || matches.get_flag(options::BYTES))
     {
@@ -789,6 +798,13 @@ pub fn uu_app() -> Command {
                 .help("dereference all symbolic links")
                 .action(ArgAction::SetTrue)
         )
+        .arg(
+            Arg::new(options::DEREFERENCE_ARGS)
+                .short('D')
+                .long(options::DEREFERENCE_ARGS)
+                .help("dereference only symlinks that are listed on the command line")
+                .action(ArgAction::SetTrue)
+        )
         // .arg(
         //     Arg::new("no-dereference")
         //         .short('P')

tests/by-util/test_du.rs

@@ -3,7 +3,7 @@
 //  * For the full copyright and license information, please view the LICENSE
 //  * file that was distributed with this source code.
 
-// spell-checker:ignore (paths) sublink subwords azerty azeaze xcwww azeaz amaz azea qzerty tazerty
+// spell-checker:ignore (paths) sublink subwords azerty azeaze xcwww azeaz amaz azea qzerty tazerty tsublink
 #[cfg(not(windows))]
 use regex::Regex;
 use std::io::Write;
@@ -285,6 +285,30 @@ fn test_du_dereference() {
     _du_dereference(result.stdout_str());
 }
 
+#[cfg(not(windows))]
+#[test]
+fn test_du_dereference_args() {
+    let ts = TestScenario::new(util_name!());
+    let at = &ts.fixtures;
+
+    at.mkdir_all("subdir");
+    let mut file1 = at.make_file("subdir/file-ignore1");
+    file1.write_all(b"azeaze").unwrap();
+    let mut file2 = at.make_file("subdir/file-ignore1");
+    file2.write_all(b"amaz?ng").unwrap();
+    at.symlink_dir("subdir", "sublink");
+
+    let result = ts.ucmd().arg("-D").arg("-s").arg("sublink").succeeds();
+    let stdout = result.stdout_str();
+
+    assert!(!stdout.starts_with("0"));
+    assert!(stdout.contains("sublink"));
+
+    // Without the option
+    let result = ts.ucmd().arg("-s").arg("sublink").succeeds();
+    result.stdout_contains("0\tsublink\n");
+}
+
 #[cfg(target_vendor = "apple")]
 fn _du_dereference(s: &str) {
     assert_eq!(s, "4\tsubdir/links/deeper_dir\n16\tsubdir/links\n");
@@ -851,6 +875,7 @@ fn test_du_exclude_invalid_syntax() {
         .stderr_contains("du: Invalid exclude syntax");
 }
 
+#[cfg(not(windows))]
 #[test]
 fn test_du_symlink_fail() {
     let ts = TestScenario::new(util_name!());
@@ -861,6 +886,7 @@ fn test_du_symlink_fail() {
     ts.ucmd().arg("-L").arg("target.txt").fails().code_is(1);
 }
 
+#[cfg(not(windows))]
 #[test]
 fn test_du_symlink_multiple_fail() {
     let ts = TestScenario::new(util_name!());