prain front door and OpenRC user service for the prain stack

openrc/init.d/prain

@@ -0,0 +1,33 @@
+#!/sbin/openrc-run
+# One service of the prain stack, picked by the link name: prain.vllm, prain.web, ...
+# What it runs comes from prain.conf (`prain run NAME`); supervision settings from
+# conf.d/prain.NAME (respawn_max, respawn_period, respawn_delay).
+
+stack_name=${RC_SVCNAME#prain.}
+description="prain stack: ${stack_name}"
+supervisor=supervise-daemon
+command=${prain_bin:-$HOME/.local/bin/prain}
+command_args="run ${stack_name}"
+respawn_delay=${respawn_delay:-5}
+respawn_max=${respawn_max:-3}
+respawn_period=${respawn_period:-600}
+output_log=${XDG_STATE_HOME:-$HOME/.local/state}/prain/${stack_name}.log
+error_log=${output_log}
+
+depend() {
+	need $("${prain_bin:-$HOME/.local/bin/prain}" need "${RC_SVCNAME#prain.}")
+}
+
+start_pre() {
+	if [ "${RC_SVCNAME}" = prain ]; then
+		eerror "Start a link to this script, like prain.vllm"
+		return 1
+	fi
+	checkpath -d "${output_log%/*}"
+}
+
+start_post() {
+	ebegin "Waiting until ${stack_name} is ready"
+	"${command}" wait "${stack_name}"
+	eend $?
+}