Detect md arrays via /proc/mdstat for RAID status

system_checks.py

@@ -1,5 +1,6 @@
 import subprocess
 import os
+import re
 
 
 def _cmd(cmd: str) -> str:
@@ -83,16 +84,25 @@ def list_disks() -> list[str]:
 
 
 def list_md_arrays() -> list[str]:
-    out = _cmd("lsblk -dn -o NAME,TYPE")
-    arrays = []
+    # Prefer /proc/mdstat: it reliably lists active md arrays
+    # even when lsblk tree/filters differ across distros.
+    out = _cmd("cat /proc/mdstat")
+    arrays: set[str] = set()
     for line in out.splitlines():
-        parts = line.split()
-        if len(parts) != 2:
-            continue
-        name, typ = parts
-        if typ.startswith("raid") and name.startswith("md"):
-            arrays.append(f"/dev/{name}")
-    return arrays
+        m = re.match(r"^\s*(md\d+)\s*:", line)
+        if m:
+            arrays.add(f"/dev/{m.group(1)}")
+
+    if arrays:
+        return sorted(arrays)
+
+    # Fallback for environments where mdstat parsing is unavailable.
+    out = _cmd("ls -1 /dev/md* 2>/dev/null")
+    for line in out.splitlines():
+        dev = line.strip()
+        if dev and re.match(r"^/dev/md\d+$", dev):
+            arrays.add(dev)
+    return sorted(arrays)
 
 
 def md_array_status(dev: str) -> str: