Raspberry Pi Zero 2 W image builder; Power off/Restart buttons

pi/build-image.sh makes a ready-to-flash card: Raspberry Pi OS Lite 2026-10-06
+ the Gyre software as a service on http://gyre.local (port 80), first-boot
setup through cloud-init (user, SSH key, Wi-Fi, packages from the card), USB
host mode on the Zero 2's data port. No root: mtools for the boot partition,
debugfs for the root filesystem. Wi-Fi and credentials stay in the work dir.

Web page: Power off / Restart links when GYRE_POWER_BUTTONS=1 (set by the Pi
service); thumbnails keyed by file contents so pre-made ones ship on the card;
stale thumbnails pruned.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

software/tests/test_web.py

@@ -64,6 +64,15 @@ class TestLibrary(unittest.TestCase):
         self.assertTrue(os.path.getsize(png) > 1000)
         self.assertGreater(self.lib.items()[1]['est'], 0)      # running time known once the thumbnail is made
 
+    def test_thumb_key_follows_contents_not_dates(self):
+        k1 = self.lib._key('spirals/tiny.thr')
+        p = self.lib.path('spirals/tiny.thr')
+        os.utime(p, (1, 1))                                   # same contents, other date
+        self.assertEqual(self.lib._key('spirals/tiny.thr'), k1)
+        with open(p, 'a') as f:
+            f.write('0 0\n')
+        self.assertNotEqual(self.lib._key('spirals/tiny.thr'), k1)
+
     def test_refuses_paths_outside(self):
         for bad in ('../cache/index.json', '../../tiny.thr', '/etc/passwd', 'spirals/../../x.thr', 'spirals/nope.thr'):
             with self.assertRaises(KeyError):
@@ -264,6 +273,8 @@ class TestHttp(unittest.TestCase):
         self.assertFalse(self.post('play', {'ids': ['../../etc/passwd']})['ok'])
         up = self.post('upload?name=new.thr', raw=b'0 0\n6.28 1\n')
         self.assertEqual(up['msg'], 'uploads/new.thr')
+        self.assertFalse(json.loads(self.get('/api/status'))['power_buttons'])      # off unless on the Pi
+        self.assertFalse(self.post('poweroff')['ok'])
 
 
 if __name__ == '__main__':