sh.zio.sys-daemon: add System Daemon

.gitignore

@@ -31,6 +31,7 @@
 !/etc/systemd/system/sh.zio.backup.timer
 !/etc/systemd/system/zio-backup.service
 !/etc/systemd/system/zio-backup.timer
+!/etc/systemd/system/sh.zio.sys-daemon.service
 !/etc/systemd/system/sh.zio.znc.update-cert.service
 !/etc/systemd/system/sh.zio.znc.update-cert.timer
 
@@ -51,6 +52,7 @@
 !/usr/local/bin/sh.zio.notify
 !/usr/local/bin/sh.zio.pod-exec
 !/usr/local/bin/sh.zio.pod-systemd
+!/usr/local/bin/sh.zio.sys-daemon
 !/usr/local/bin/sh.zio.update-rootfs
 !/usr/local/bin/sh.zio.znc.update-cert
 !/usr/local/bin/zio-backup

etc/systemd/system/sh.zio.sys-daemon.service

@@ -0,0 +1,8 @@
+[Unit]
+Description=sh.zio.sys-daemon
+
+[Service]
+User=root
+Group=root
+ExecStart=/usr/local/bin/sh.zio.sys-daemon
+Type=simple

usr/local/bin/sh.zio.sys-daemon

@@ -0,0 +1,66 @@
+#!/usr/bin/env bash
+
+_PLUG_TITLE="System Daemon"
+_PLUG_DESCRIPTION=""
+#_PLUG_ARGS=(
+#)
+_PLUG_ROOT="true"
+
+piddir="/var/run/zio"
+pidfile="$piddir/sh.zio.sys-daemon.pid"
+
+# TODO: Pidfiles
+
+function check_pidfile() {
+	mkdir -p "$piddir"
+
+	if [[ -f $pidfile ]]; then
+		pid="$(cat $pidfile)"
+		if ps -p $pid > /dev/null; then
+			die "Already running (PID exists: $pidfile)"
+		    exit
+		fi
+	else
+		touch "$pidfile"
+		echo "$$" > "$pidfile"
+	fi
+}
+
+function del_pidfile() {
+	rm -f "$pidfile"
+}
+
+function notify_startup() {
+	/usr/local/bin/sh.zio.notify \
+		--level "info" \
+		--message "**$(hostname -f)** completed startup at $(date "+%d-%b-%Y %H:%M:%S %Z")" \
+		--title "Node online"
+}
+
+function main() {
+	check_pidfile
+
+	notify_startup
+	sleep infinity
+
+	del_pidfile
+}
+
+if [[ $_PLUG_INVOKED != "true" ]]; then
+    base_dir="$(dirname "$(realpath -s "$0")")"
+    git_dir="$base_dir/../../.."
+
+    if [[ -d "$git_dir/.git" ]]; then
+    	. "$git_dir/usr/local/libexec/zio/helpers/bash.sh"
+    else
+    	. "/usr/local/libexec/zio/helpers/bash.sh"
+    fi
+
+    export -f get_config_dir
+
+    if [[ -d "$git_dir/.git" ]]; then
+        "$git_dir/usr/local/libexec/sodalite/invoker/src/invoke.sh" "$0" $@
+    else
+        "/usr/local/libexec/sodalite/invoker/src/invoke.sh" "$0" $@
+    fi
+fi