Improve LayerFilesystem iterdir and scandir

dissect/target/filesystem.py

@@ -1535,6 +1535,9 @@
         yielded = {".", ".."}
         selfentry = self._resolve()
         for fsentry in selfentry.entries:
+            if not fsentry.is_dir():
+                continue
+
             for entry_name in fsentry.iterdir():
                 name = entry_name if selfentry.fs.case_sensitive else entry_name.lower()
                 if name in yielded:
@@ -1550,6 +1553,9 @@
         items = defaultdict(list)
         selfentry = self._resolve()
         for fsentry in selfentry.entries:
+            if not fsentry.is_dir():
+                continue
+
             for entry in fsentry.scandir():
                 name = entry.name if selfentry.fs.case_sensitive else entry.name.lower()
                 if name in (".", ".."):

dissect/target/plugins/filesystem/walkfs.py

@@ -37,6 +37,15 @@
     @arg("--walkfs-path", default="/", help="path to recursively walk")
     def walkfs(self, walkfs_path: str = "/") -> Iterator[FilesystemRecord]:
         """Walk a target's filesystem and return all filesystem entries."""
+
+        if not self.target.fs.path(walkfs_path).exists():
+            self.target.log.error("No such file or directory: '%s'", walkfs_path)
+            return
+
+        if not self.target.fs.path(walkfs_path).is_dir():
+            self.target.log.error("Not a directory: '%s'", walkfs_path)
+            return
+
         for entry in self.target.fs.recurse(walkfs_path):
             try:
                 yield generate_record(self.target, entry)