Remove fs::canonicalize in walk_tree fix.

* Remove ConfiFile struct, it is not needed without the fs::canonicalize
  call.
* Don't check if the file is in the stash when walking the tree,
  without "canonicalization" it is not necessary.

src/cargo/util/config.rs

@@ -22,30 +22,6 @@ use util::toml as cargo_toml;
 
 use self::ConfigValue as CV;
 
-#[derive(PartialEq, Eq, Hash)]
-struct ConfigFile {
-    path: Option<PathBuf>,
-}
-
-impl ConfigFile {
-    pub fn new(path: PathBuf) -> ConfigFile {
-        let canonical = match fs::canonicalize(path) {
-            Ok(p) => Some(p),
-            Err(_) => None,
-        };
-
-        ConfigFile { path: canonical }
-    }
-
-    pub fn exist(&self) -> bool {
-        self.path.is_some()
-    }
-
-    pub fn as_path_buf(&self) -> Option<PathBuf> {
-        self.path.clone()
-    }
-}
-
 pub struct Config {
     home_path: Filesystem,
     shell: RefCell<MultiShell>,
@@ -700,15 +676,14 @@ fn walk_tree<F>(pwd: &Path, mut walk: F) -> CargoResult<()>
     where F: FnMut(File, &Path) -> CargoResult<()>
 {
     let mut current = pwd;
-    let mut stash: HashSet<ConfigFile> = HashSet::new();
+    let mut stash: HashSet<PathBuf> = HashSet::new();
 
     loop {
-        let possible = ConfigFile::new(current.join(".cargo").join("config"));
-        if possible.exist() && stash.get(&possible).is_none() {
-            let name = possible.as_path_buf().unwrap();
-            let file = try!(File::open(&name));
+        let possible = current.join(".cargo").join("config");
+        if fs::metadata(&possible).is_ok() {
+            let file = try!(File::open(&possible));
 
-            try!(walk(file, &name));
+            try!(walk(file, &possible));
 
             stash.insert(possible);
         }
@@ -726,11 +701,10 @@ fn walk_tree<F>(pwd: &Path, mut walk: F) -> CargoResult<()>
         human("Cargo couldn't find your home directory. \
               This probably means that $HOME was not set.")
     }));
-    let config = ConfigFile::new(home.join("config"));
-    if config.exist() && stash.get(&config).is_none() {
-        let name = config.as_path_buf().unwrap();
-        let file = try!(File::open(&name));
-        try!(walk(file, &name));
+    let config = home.join("config");
+    if !stash.contains(&config) && fs::metadata(&config).is_ok() {
+        let file = try!(File::open(&config));
+        try!(walk(file, &config));
     }
 
     Ok(())