From 51a4e6c7a2129c20be9c06c6973f351814a5da76 Mon Sep 17 00:00:00 2001
From: David Manthey <david.manthey@kitware.com>
Date: Fri, 3 Nov 2023 10:14:20 -0400
Subject: [PATCH] Have zarr use read-only mode

---
 CHANGELOG.md                                     | 5 +++++
 sources/zarr/large_image_source_zarr/__init__.py | 4 ++--
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index fa280b4c0..f8ec40bc8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Change Log
 
+## 1.26.1
+
+### Improvements
+- Have zarr use read-only mode ([#1360](../../pull/1360))
+
 ## 1.26.0
 
 ### Features
diff --git a/sources/zarr/large_image_source_zarr/__init__.py b/sources/zarr/large_image_source_zarr/__init__.py
index 6c403bdf2..409e99ac6 100644
--- a/sources/zarr/large_image_source_zarr/__init__.py
+++ b/sources/zarr/large_image_source_zarr/__init__.py
@@ -57,10 +57,10 @@ def __init__(self, path, **kwargs):
         if not os.path.isfile(self._largeImagePath) and '//:' not in self._largeImagePath:
             raise TileSourceFileNotFoundError(self._largeImagePath) from None
         try:
-            self._zarr = zarr.open(zarr.SQLiteStore(self._largeImagePath))
+            self._zarr = zarr.open(zarr.SQLiteStore(self._largeImagePath), mode='r')
         except Exception:
             try:
-                self._zarr = zarr.open(self._largeImagePath)
+                self._zarr = zarr.open(self._largeImagePath, mode='r')
             except Exception:
                 if os.path.basename(self._largeImagePath) in {'.zgroup', '.zattrs'}:
                     try: