Adding upstream version 2.19.0.

Signed-off-by: Daniel Baumann <daniel@debian.org>

pre_commit/commands/validate_manifest.py

@@ -0,0 +1,16 @@
+from __future__ import annotations
+
+from pre_commit import clientlib
+
+
+def validate_manifest(filenames: list[str]) -> int:
+    ret = 0
+
+    for filename in filenames:
+        try:
+            clientlib.load_manifest(filename)
+        except clientlib.InvalidManifestError as e:
+            print(e)
+            ret = 1
+
+    return ret