Show file system inode usage and read-only status

bin/malpd

@@ -3,6 +3,7 @@
 require "socket"
 require "fileutils"
 require "json"
+require "shellwords"
 
 SOCKET_PATH = "/run/malpd/malpd.sock"
 
@@ -63,8 +64,16 @@ def read_smart(name)
   result
 end
 
+def read_inodes(mount)
+  out = `stat -f -c '%c %d' #{Shellwords.escape(mount)} 2>/dev/null`.strip
+  return nil if out.empty?
+  total, free = out.split.map(&:to_i)
+  return nil unless total && total > 0
+  [total, total - free]
+end
+
 def read_filesystems
-  out = `findmnt -J -b -o SOURCE,TARGET,FSTYPE,SIZE,USED 2>/dev/null`
+  out = `findmnt -J -b -o SOURCE,TARGET,FSTYPE,SIZE,USED,OPTIONS 2>/dev/null`
   return [] if out.empty?
   data = JSON.parse(out) rescue nil
   return [] unless data
@@ -86,14 +95,22 @@ def read_filesystems
     key = [source, target]
     next if seen[key]
     seen[key] = true
-    result << {
-      "type"   => "filesystem",
-      "source" => source,
-      "mount"  => target,
-      "fstype" => fstype,
-      "size"   => size,
-      "used"   => node["used"].to_i
+
+    opts = node["options"].to_s.split(",")
+    entry = {
+      "type"     => "filesystem",
+      "source"   => source,
+      "mount"    => target,
+      "fstype"   => fstype,
+      "size"     => size,
+      "used"     => node["used"].to_i,
+      "readonly" => opts.include?("ro")
     }
+    if (ino = read_inodes(target))
+      entry["inode_total"] = ino[0]
+      entry["inode_used"]  = ino[1]
+    end
+    result << entry
   end
   result
 end