Fix #749, #620: implement lchown()

src/filesystem/implementation.js

@@ -279,12 +279,52 @@ function find_node(context, path, callback) {
 }
 
 /**
- * find_lnode
+ * find_symlink_node
  */
 // in: file or directory path
-// out: node structure, or error
-function find_symbolic_node(context, path, callback) {
-  lstat_file(context, path, callback);
+// out: symlink node structure, or error
+function find_symlink_node(context, path, callback) {
+  path = normalize(path);
+  var name = basename(path);
+  var parentPath = dirname(path);
+
+  var directoryNode;
+  var directoryData;
+
+  if(ROOT_DIRECTORY_NAME === name) {
+    find_node(context, path, callback);
+  } else {
+    find_node(context, parentPath, read_directory_data);
+  }
+
+  function read_directory_data(error, result) {
+    if(error) {
+      callback(error);
+    } else {
+      directoryNode = result;
+      context.getObject(directoryNode.data, check_if_file_exists);
+    }
+  }
+
+  function create_node(error, data) {
+    if(error) {
+      return callback(error);
+    }
+    Node.create(data, callback);
+  }
+
+  function check_if_file_exists(error, result) {
+    if(error) {
+      callback(error);
+    } else {
+      directoryData = result;
+      if(!directoryData.hasOwnProperty(name)) {
+        callback(new Errors.ENOENT('a component of the path does not name an existing file', path));
+      } else {
+        context.getObject(directoryData[name].id, create_node);
+      }
+    }
+  }
 } 
 
 /**
@@ -2078,7 +2118,7 @@ function lchown_file(context, path, uid, gid, callback) {
       update_node_times(context, path, node, { mtime: Date.now() }, callback);
     }
   }
-  find_symbolic_node(context, path, update_owner);
+  find_symlink_node(context, path, update_owner);
 } 
 
 function getxattr(context, path, name, callback) {

src/filesystem/interface.js

@@ -341,7 +341,6 @@ function FileSystem(options, callback) {
     { name: 'futimes' },
     { name: 'getxattr', promises: true, absPathArgs: [0] },
     { name: 'lchown' },
-    // lchmod - https://github.com/filerjs/filer/issues/619
     { name: 'link', promises: true, absPathArgs: [0, 1] },
     { name: 'lseek' },
     { name: 'lstat', promises: true },