2 files changed, 76 insertions, 0 deletions
diff --git a/pkgs/check_mdstat/check_mdstat b/pkgs/check_mdstat/check_mdstat
new file mode 100755
index 0000000..32fc168
--- /dev/null
+++ b/pkgs/check_mdstat/check_mdstat
@@ -0,0 +1,50 @@
+#!/usr/bin/env bash
+
+stat=/proc/mdstat
+
+if [ ! -e "$stat" ]; then
+  echo "WARNING: $stat does not exist"
+  exit 1
+fi
+
+if [ ! -r "$stat" ]; then
+  echo "WARNING: cannot read $stat"
+  exit 1
+fi
+
+count=$(grep ^md -c "$stat")
+
+if [ "$count" -eq 0 ]; then
+  echo 'WARNING: no arrays found.'
+  exit 1
+elif [ "$count" -eq 1 ]; then
+  out="Linux Software RAID: $count array"
+else
+  out="Linux Software RAID: $count arrays"
+fi
+
+degrated=$(grep -c '\[.*_.*\]' "$stat")
+recovering=$(awk '/recovery/ {print $4}' "$stat")
+resyncing=$(awk '/resync/ {print $4}' "$stat")
+
+if [ -n "$recovering" ]; then
+  out="$out, recovering: $recovering"
+elif [ -n "$resyncing" ]; then
+  out="$out, resyncing: $resyncing"
+elif [ "$degrated" -gt 0 ]; then
+  out="$out, degrated: $degrated"
+fi
+
+if [ "$degrated" -gt 0 ]; then
+  echo "CRITICAL: $out."
+  exit 2
+fi
+
+if [ -n "$recovering$resyncing" ]; then
+  echo "WARNING: $out."
+  exit 1
+fi
+
+echo "OK: $out."
+exit 0
+
diff --git a/pkgs/check_mdstat/default.nix b/pkgs/check_mdstat/default.nix
new file mode 100644
index 0000000..5e645fd
--- /dev/null
+++ b/pkgs/check_mdstat/default.nix
@@ -0,0 +1,26 @@
+{ stdenv, gawk, gnugrep }:
+
+stdenv.mkDerivation {
+  name = "check_mdstat";
+  src = ./check_mdstat;
+  outputs = [ "out" "conf" ];
+  unpackPhase = ":";
+  installPhase = ''
+    mkdir -p $out/bin
+
+    cp "$src" $out/bin/check_mdstat
+
+    substituteInPlace "$out/bin/"* \
+      --replace awk '${gawk}/bin/awk' \
+      --replace grep '${gnugrep}/bin/grep'
+
+    chmod +x "$out/bin/"*
+
+    cat <<CONF > $conf
+    object CheckCommand "mdstat" {
+      import "plugin-check-command"
+      command = [ "$out/bin/check_mdstat" ]
+    }
+    CONF
+  '';
+}