From fe15d993f9b79a59531fb0cf46fe02be7514316e Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@koston.org>
Date: Sun, 24 Dec 2023 03:56:31 -1000
Subject: [PATCH] dashboard: Fix file writes on Windows (#6013)

---
 esphome/dashboard/util/file.py    | 10 +++++++++-
 tests/dashboard/util/test_file.py |  2 +-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/esphome/dashboard/util/file.py b/esphome/dashboard/util/file.py
index 5f3c5f5f1b..661d5f34cf 100644
--- a/esphome/dashboard/util/file.py
+++ b/esphome/dashboard/util/file.py
@@ -30,6 +30,7 @@ def write_file(
     """
 
     tmp_filename = ""
+    missing_fchmod = False
     try:
         # Modern versions of Python tempfile create this file with mode 0o600
         with tempfile.NamedTemporaryFile(
@@ -38,8 +39,15 @@ def write_file(
             fdesc.write(utf8_data)
             tmp_filename = fdesc.name
             if not private:
-                os.fchmod(fdesc.fileno(), 0o644)
+                try:
+                    os.fchmod(fdesc.fileno(), 0o644)
+                except AttributeError:
+                    # os.fchmod is not available on Windows
+                    missing_fchmod = True
+
         os.replace(tmp_filename, filename)
+        if missing_fchmod:
+            os.chmod(filename, 0o644)
     finally:
         if os.path.exists(tmp_filename):
             try:
diff --git a/tests/dashboard/util/test_file.py b/tests/dashboard/util/test_file.py
index 89e6b97086..270ab565f1 100644
--- a/tests/dashboard/util/test_file.py
+++ b/tests/dashboard/util/test_file.py
@@ -13,7 +13,7 @@ def test_write_utf8_file(tmp_path: Path) -> None:
     assert tmp_path.joinpath("foo.txt").read_text() == "foo"
 
     with pytest.raises(OSError):
-        write_utf8_file(Path("/not-writable"), "bar")
+        write_utf8_file(Path("/dev/not-writable"), "bar")
 
 
 def test_write_file(tmp_path: Path) -> None: