fix(recovery): use modern no-log-replay mount option and report stderr

hydra/system_recovery.py

@@ -150,8 +150,12 @@ def sync_tree(root):
 
 class Btrfs:
     def run(self, argv):
-        return subprocess.run(argv, check=True, text=True, stdout=subprocess.PIPE,
-                              stderr=subprocess.PIPE, env=dict(os.environ, LC_ALL='C')).stdout
+        try:
+            return subprocess.run(argv, check=True, text=True, stdout=subprocess.PIPE,
+                                  stderr=subprocess.PIPE, env=dict(os.environ, LC_ALL='C')).stdout
+        except subprocess.CalledProcessError as exc:
+            detail = (exc.stderr or '').strip()[:2000]
+            raise RecoveryError(f'{argv[0]} failed ({exc.returncode}): {detail}') from exc
     def info(self, path):
         output = self.run(['btrfs', 'subvolume', 'show', str(path)])
         fields = dict(line.strip().split(':', 1) for line in output.splitlines() if ':' in line)
@@ -476,7 +480,7 @@ def mounted(backend, device, filesystem, writable=False):
         options = ['rw' if writable else 'ro', 'nosuid', 'nodev', 'noexec']
         if filesystem == 'btrfs':
             options.append('subvolid=5')
-            if not writable: options.append('nologreplay')
+            if not writable: options.append('rescue=nologreplay')
         backend.run(['mount', '-t', filesystem, '-o', ','.join(options), device, str(directory)])
         did_mount = True
         if filesystem == 'btrfs':