prain stack: requires_NAME refuses to start without its services, merged --help

openrc/conf.d/prain.web

@@ -0,0 +1,3 @@
+# Order only: in a runlevel with both, web starts after vLLM is ready. Starting web alone
+# never starts vLLM; requires_web in prain.conf makes it fail with a message instead.
+rc_after="prain.vllm"

openrc/init.d/prain

@@ -1,7 +1,8 @@
 #!/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).
+# What it runs and what must already run come from prain.conf (`prain run NAME`,
+# `prain deps NAME`); supervision settings and start order from conf.d/prain.NAME
+# (respawn_max, respawn_period, respawn_delay, rc_after).
 
 stack_name=${RC_SVCNAME#prain.}
 description="prain stack: ${stack_name}"
@@ -14,16 +15,13 @@ respawn_period=${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%/*}"
+	"${command}" deps "${stack_name}"  # requires_NAME in prain.conf: refuse, never start them
 }
 
 start_post() {