2 files changed, 45 insertions, 0 deletions
diff --git a/pkgs/check_systemd/check_systemd b/pkgs/check_systemd/check_systemd
new file mode 100755
index 0000000..e668331
--- /dev/null
+++ b/pkgs/check_systemd/check_systemd
@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+readarray -t failed < <( systemctl show '*.service' \
+    --state=failed --property=Names \
+    | sed -r -n 's,Names=(.+)\.service,\1,p' \
+    | sort
+  )
+
+if [ ${#failed[@]} -ne 0 ]; then
+  printf -v list ', %s' "${failed[@]}"
+  printf 'WARNING: %s failed\n' "${list:2}"
+  exit 1
+else
+  echo "OK: no failed services"
+  exit 0
+fi
+
+
diff --git a/pkgs/check_systemd/default.nix b/pkgs/check_systemd/default.nix
new file mode 100644
index 0000000..da92a64
--- /dev/null
+++ b/pkgs/check_systemd/default.nix
@@ -0,0 +1,25 @@
+{ stdenv, gnused }:
+
+stdenv.mkDerivation {
+  name = "check_systemd";
+  src = ./check_systemd;
+  outputs = [ "out" "conf" ];
+  unpackPhase = ":";
+  installPhase = ''
+    mkdir -p $out/bin
+
+    cp "$src" $out/bin/check_systemd
+
+    substituteInPlace "$out/bin/"* \
+      --replace sed '${gnused}/bin/sed'
+
+    chmod +x "$out/bin/"*
+
+    cat <<CONF > $conf
+    object CheckCommand "systemd" {
+      import "plugin-check-command"
+      command = [ "$out/bin/check_systemd" ]
+    }
+    CONF
+  '';
+}