From d513970f5ae782fb5e168c8e6bbed9e09b4dde96 Mon Sep 17 00:00:00 2001
From: Ronald G Minnich <rminnich@gmail.com>
Date: Fri, 12 Jun 2026 07:42:31 -0700
Subject: [PATCH] Add a systemd for embedded systems with one user

This is a dead simple systemd unit file, that assumes
cpud is in root's $PATH, and a key in /key.pub.

It's really for basic use with small boards that have
one user.

Signed-off-by: Ronald G Minnich <rminnich@gmail.com>
---
 systemd/Makefile     |  7 +++++++
 systemd/README.md    |  7 +++++++
 systemd/cpud.service | 11 +++++++++++
 3 files changed, 25 insertions(+)
 create mode 100644 systemd/Makefile
 create mode 100644 systemd/README.md
 create mode 100644 systemd/cpud.service

diff --git a/systemd/Makefile b/systemd/Makefile
new file mode 100644
index 00000000..0bf1a121
--- /dev/null
+++ b/systemd/Makefile
@@ -0,0 +1,7 @@
+all:
+	cp cpud.service /etc/systemd/system/cpud.service
+
+reload:
+	systemctl daemon-reload
+	systemctl enable --now cpud
+
diff --git a/systemd/README.md b/systemd/README.md
new file mode 100644
index 00000000..2ba23f15
--- /dev/null
+++ b/systemd/README.md
@@ -0,0 +1,7 @@
+This is a primitive unit file for systemd.
+
+For now, it is for small embedded systems, with a shared key: /key.pub.
+
+We welcome improvements. 
+
+
diff --git a/systemd/cpud.service b/systemd/cpud.service
new file mode 100644
index 00000000..3a90e45c
--- /dev/null
+++ b/systemd/cpud.service
@@ -0,0 +1,11 @@
+[Unit]
+Description=CPU daemon
+After=network.target
+
+[Service]
+ExecStart=/usr/bin/cpud -pk /key.pub
+Restart=on-failure
+
+[Install]
+WantedBy=multi-user.target
+