examples, oneshot services rework

Signed-off-by: fbt <fbt@fleshless.org>

examples/services/iptables

@@ -0,0 +1,11 @@
+#!/usr/bin/env ssm
+
+service_oneshot = true
+service_command = /usr/bin/false
+
+service::pre_start() {
+	cat <<- EOF
+		Please don't. Use ferm or any other wrapper.
+		You will just reinvent one in here anyway.
+	EOF
+}

examples/services/nginx

@@ -0,0 +1,8 @@
+#!/usr/bin/env ssm
+
+service_respawn = on-failure
+service_command = /usr/bin/nginx
+service_pidfile = /run/nginx.pid
+
+# Do not reload the service if the config test fails.
+pre_reload() { "$service_command" -t "$@"; }

examples/services/rc.local

@@ -0,0 +1,9 @@
+#!/usr/bin/env ssm
+
+service_type = oneshot
+service_command = /etc/rc.local
+
+pre_start() {
+	# Do nothing, successfully, if /etc/rc.local is not executable.
+	[[ -x "/etc/rc.local" ]] || die 0
+}

examples/services/sshd

@@ -0,0 +1,10 @@
+#!/usr/bin/env ssm
+
+service_respawn = always
+service_command = /usr/bin/sshd -D -f "/etc/ssh/sshd_config"
+
+pre_start() {
+	if ! [[ -e "/etc/ssh/ssh_host_key" ]]; then
+		ssh-keygen -A
+	fi
+}

examples/services/tinc

@@ -0,0 +1,7 @@
+#!/usr/bin/env ssm
+
+# This trick was neat back in 2011, I swear
+var tinc_network = "${service_name##*-}"
+
+service_respawn = on-failure
+service_command = /usr/bin/tincd -D -n "$tinc_network"