Fix mojibake text and add md RAID checks

system_checks.py

@@ -82,6 +82,53 @@ def list_disks() -> list[str]:
     return disks
 
 
+def list_md_arrays() -> list[str]:
+    out = _cmd("lsblk -dn -o NAME,TYPE")
+    arrays = []
+    for line in out.splitlines():
+        parts = line.split()
+        if len(parts) != 2:
+            continue
+        name, typ = parts
+        if typ == "raid" and name.startswith("md"):
+            arrays.append(f"/dev/{name}")
+    return arrays
+
+
+def md_array_status(dev: str) -> str:
+    out = _cmd("cat /proc/mdstat")
+    if not out or "ERROR:" in out:
+        return "⚠️ n/a"
+
+    name = dev.rsplit("/", 1)[-1]
+    lines = out.splitlines()
+    header = None
+    idx = -1
+    for i, line in enumerate(lines):
+        s = line.strip()
+        if s.startswith(f"{name} :"):
+            header = s
+            idx = i
+            break
+
+    if not header:
+        return "⚠️ not found in /proc/mdstat"
+
+    if "inactive" in header:
+        return "🔴 inactive"
+
+    # Typical mdstat health marker: [UU] for healthy mirrors/raid members.
+    block = [header]
+    for line in lines[idx + 1:]:
+        if not line.strip():
+            break
+        block.append(line.strip())
+    block_text = " ".join(block)
+    if "[U_" in block_text or "[_U" in block_text:
+        return "🟡 degraded"
+    return "🟢 active"
+
+
 def smart_health(dev: str) -> str:
     out = _cmd(f"smartctl -H {dev}")
 
@@ -138,8 +185,9 @@ def smart_last_test(dev: str) -> str:
 
 def disks() -> str:
     disks = list_disks()
+    md_arrays = list_md_arrays()
 
-    if not disks:
+    if not disks and not md_arrays:
         return "💽 Disks\n\n❌ No disks found"
 
     lines = ["💽 Disks (SMART)\n"]
@@ -158,6 +206,12 @@ def disks() -> str:
 
         lines.append(f"{icon} {d} — {health}, 🌡 {temp}")
 
+    if md_arrays:
+        lines.append("")
+        lines.append("🧱 RAID (md)")
+        for md in md_arrays:
+            lines.append(f"{md} — {md_array_status(md)}")
+
     return "\n".join(lines)