diff --git a/aws_doc_sdk_examples_tools/fs.py b/aws_doc_sdk_examples_tools/fs.py
new file mode 100644
index 0000000..e980e60
--- /dev/null
+++ b/aws_doc_sdk_examples_tools/fs.py
@@ -0,0 +1,112 @@
+from abc import ABC, abstractmethod
+from dataclasses import dataclass
+from fnmatch import fnmatch
+from os import listdir
+from pathlib import Path
+from stat import S_ISREG
+from typing import Dict, Generator, List
+
+
+@dataclass(frozen=True)
+class Stat:
+    path: Path
+    exists: bool
+    is_file: bool
+
+    @property
+    def is_dir(self):
+        return self.exists and not self.is_file
+
+
+class Fs(ABC):
+    @abstractmethod
+    def glob(self, path: Path, glob: str) -> Generator[Path, None, None]:
+        pass
+
+    @abstractmethod
+    def read(self, path: Path) -> str:
+        pass
+
+    @abstractmethod
+    def write(self, path: Path, content: str):
+        pass
+
+    @abstractmethod
+    def stat(self, path: Path) -> Stat:
+        pass
+
+    @abstractmethod
+    def mkdir(self, path: Path):
+        pass
+
+    @abstractmethod
+    def list(self, path: Path) -> List[Path]:
+        pass
+
+
+class PathFs(Fs):
+    def glob(self, path: Path, glob: str) -> Generator[Path, None, None]:
+        return path.glob(glob)
+
+    def read(self, path: Path) -> str:
+        with path.open("r") as file:
+            return file.read()
+
+    def write(self, path: Path, content: str):
+        with path.open("w") as file:
+            file.write(content)
+
+    def stat(self, path: Path) -> Stat:
+        if path.exists():
+            stat = path.stat()
+            return Stat(path, True, S_ISREG(stat.st_mode))
+        else:
+            return Stat(path, False, False)
+
+    def mkdir(self, path: Path):
+        path.mkdir(parents=True, exist_ok=True)
+
+    def list(self, path: Path) -> List[Path]:
+        if self.stat(path).is_file:
+            return []
+        return [path / name for name in listdir(path)]
+
+
+class RecordFs(Fs):
+    def __init__(self, fs: Dict[Path, str]):
+        self.fs = fs
+
+    def glob(self, path: Path, glob: str) -> Generator[Path, None, None]:
+        path_s = str(path)
+        for key in self.fs.keys():
+            key_s = str(key)
+            if key_s.startswith(path_s):
+                if fnmatch(key_s, glob):
+                    yield key
+
+    def read(self, path: Path) -> str:
+        return self.fs[path]
+
+    def write(self, path: Path, content: str):
+        base = str(path.parent)
+        assert any(
+            [str(key).startswith(base) for key in self.fs]
+        ), "No parent folder, this will probably fail without a call to mkdir in a real file system!"
+        self.fs[path] = content
+
+    def stat(self, path: Path):
+        if path in self.fs:
+            return Stat(path, True, True)
+        for item in self.fs.keys():
+            if str(item).startswith(str(path)):
+                return Stat(path, True, False)
+        return Stat(path, False, False)
+
+    def mkdir(self, path: Path):
+        self.fs.setdefault(path, "")
+
+    def list(self, path: Path) -> List[Path]:
+        return [item for item in self.fs.keys() if item.parent == path]
+
+
+fs = PathFs()