From c435a800306987ef1d034f84f685b826153b55a5 Mon Sep 17 00:00:00 2001
From: Simon Willison <swillison@gmail.com>
Date: Mon, 12 Oct 2026 12:12:52 -0700
Subject: [PATCH] Use hashlib.file_digest for database hashes

Inline the SHA-256 file digest in Database.hash and remove inspect_hash and HASH_BLOCK_SIZE. hashlib.file_digest has been available since Python 3.11.
---
 datasette/database.py |  4 ++--
 datasette/inspect.py  | 17 -----------------
 2 files changed, 2 insertions(+), 19 deletions(-)

diff --git a/datasette/database.py b/datasette/database.py
index 0fecc068..2d1933be 100644
--- a/datasette/database.py
+++ b/datasette/database.py
@@ -17,7 +17,6 @@ import sqlite_utils
 from opentelemetry import context as otel_context_api
 from opentelemetry.trace import Status, StatusCode
 
-from .inspect import inspect_hash
 from .telemetry import (
     callback_name,
     linked_root_span_kwargs,
@@ -835,7 +834,8 @@ class Database:
             return self.cached_hash
         else:
             p = Path(self.path)
-            self.cached_hash = inspect_hash(p)
+            with p.open("rb") as fp:
+                self.cached_hash = hashlib.file_digest(fp, "sha256").hexdigest()
             return self.cached_hash
 
     @property
diff --git a/datasette/inspect.py b/datasette/inspect.py
index b126ce5c..87f0ca84 100644
--- a/datasette/inspect.py
+++ b/datasette/inspect.py
@@ -1,5 +1,3 @@
-import hashlib
-
 from .utils import (
     detect_fts,
     detect_primary_keys,
@@ -10,21 +8,6 @@ from .utils import (
     table_columns,
 )
 
-HASH_BLOCK_SIZE = 1024 * 1024
-
-
-def inspect_hash(path):
-    """Calculate the hash of a database, efficiently."""
-    m = hashlib.sha256()
-    with path.open("rb") as fp:
-        while True:
-            data = fp.read(HASH_BLOCK_SIZE)
-            if not data:
-                break
-            m.update(data)
-
-    return m.hexdigest()
-
 
 def inspect_views(conn):
     """List views in a database."""