install: support of -d dir/. to match GNU's

src/uu/install/src/install.rs

@@ -395,6 +395,16 @@ fn directory(paths: &[String], b: &Behavior) -> UResult<()> {
         for path in paths.iter().map(Path::new) {
             // if the path already exist, don't try to create it again
             if !path.exists() {
+                // Special case to match GNU's behavior:
+                // install -d foo/. should work and just create foo/
+                // std::fs::create_dir("foo/."); fails in pure Rust
+                // See also mkdir.rs for another occurrence of this
+                let path_to_create = if path.to_string_lossy().ends_with("/.") {
+                    // Do a simple dance to strip the "/."
+                    Path::new(path).components().collect::<PathBuf>()
+                } else {
+                    path.to_path_buf()
+                };
                 // Differently than the primary functionality
                 // (MainFunction::Standard), the directory functionality should
                 // create all ancestors (or components) of a directory
@@ -404,15 +414,15 @@ fn directory(paths: &[String], b: &Behavior) -> UResult<()> {
                 // target directory. All created ancestor directories will have
                 // the default mode. Hence it is safe to use fs::create_dir_all
                 // and then only modify the target's dir mode.
-                if let Err(e) =
-                    fs::create_dir_all(path).map_err_context(|| path.maybe_quote().to_string())
+                if let Err(e) = fs::create_dir_all(path_to_create.as_path())
+                    .map_err_context(|| path_to_create.as_path().maybe_quote().to_string())
                 {
                     show!(e);
                     continue;
                 }
 
                 if b.verbose {
-                    println!("creating directory {}", path.quote());
+                    println!("creating directory {}", path_to_create.quote());
                 }
             }
 

tests/by-util/test_install.rs

@@ -1124,3 +1124,27 @@ fn test_install_missing_destination() {
         file_1
     ));
 }
+
+#[test]
+fn test_install_dir_dot() {
+    // To match tests/install/d-slashdot.sh
+    let scene = TestScenario::new(util_name!());
+
+    scene.ucmd().arg("-d").arg("dir1/.").succeeds();
+    scene.ucmd().arg("-d").arg("dir2/..").succeeds();
+    // Tests that we don't have dir3/. in the output
+    // but only 'dir3'
+    scene
+        .ucmd()
+        .arg("-d")
+        .arg("dir3/.")
+        .arg("-v")
+        .succeeds()
+        .stdout_contains("creating directory 'dir3'");
+
+    let at = &scene.fixtures;
+
+    assert!(at.dir_exists("dir1"));
+    assert!(at.dir_exists("dir2"));
+    assert!(at.dir_exists("dir3"));
+}