1 files changed, 9 insertions, 0 deletions
diff --git a/gn3/fs_helpers.py b/gn3/fs_helpers.py
index e7366ac..6b0a00a 100644
--- a/gn3/fs_helpers.py
+++ b/gn3/fs_helpers.py
@@ -11,6 +11,15 @@ from typing import Dict
 from typing import List
 from werkzeug.utils import secure_filename
 
+def assert_paths_exist(paths: ValuesView) -> bool:
+    """Given a list of PATHS, throw error if any of them do not exist."""
+    for path in paths:
+        if not os.path.isfile(path):
+            if throw_error:
+                raise FileNotFoundError(errno.ENOENT, os.strerror(errno.ENOENT), path)
+            else:
+                return False
+    return True
 
 def get_hash_of_files(files: List[str]) -> str:
     """Given a list of valid of FILES, return their hash as a string"""