replacing the init system with something more OpenOS rc inspired

lib/rc.lua

@@ -0,0 +1,76 @@
+local serial = require "serialization"
+
+local rc = {}
+local service = {}
+local cfg = {}
+cfg.enabled = {}
+
+local function loadConfig()
+ local f = io.open("/boot/cfg/rc.cfg","rb")
+ if not f then return false end
+ cfg = serial.unserialize(f:read("*a")) or {}
+ f:close()
+ cfg.enabled = cfg.enabled or {}
+ return true
+end
+local function saveConfig()
+ local f = io.open("/boot/cfg/rc.cfg","wb")
+ if not f then return false end
+ f:write(serial.serialize(cfg))
+ f:close()
+ return true
+end
+
+function rc.load(name,force)
+ if force then
+  rc.stop(name)
+  service[name] = nil
+ end
+ if service[name] then return true end
+ service[name] = setmetatable({},{__index=_G})
+ local f = io.open("/boot/service/"..name..".lua","rb")
+ local res = load(f:read("*a"),name,"t",service[name])()
+ f:close()
+ return res
+end
+
+function rc.stop(name,...)
+ if not service[name] then return false, "service not found" end
+ service[name].stop(...)
+end
+
+function rc.start(name,...)
+ rc.load(name)
+ if not service[name] then return false, "service not found" end
+ return service[name].start(...)
+end
+
+function rc.restart(name)
+ rc.stop(name)
+ rc.start(name)
+end
+
+function rc.enable(name)
+ for k,v in pairs(cfg.enabled) do
+  if v == name then return false end
+ end
+ saveConfig()
+end
+function rc.disable(name)
+ local disabled = false
+ for k,v in pairs(cfg.enabled) do
+  if v == name then table.remove(cfg.enabled,k) disabled = true break end
+ end
+ saveConfig()
+ return disabled
+end
+
+loadConfig()
+
+for k,v in pairs(cfg.enabled) do
+ rc.start(v)
+end
+
+_G.service = service
+
+return rc

module/init.lua

@@ -22,20 +22,16 @@ os.spawn(function()
  os.setenv("HOSTNAME",hostname)
  syslog(string.format("Hostname set to %s",hostname))
  local pids = {}
- local function loadlist()
-  local f = io.open("/boot/cfg/init.txt","rb")
-  if not f then return false end
-  for line in f:read("*a"):gmatch("[^\r\n]+") do
-   pids[line] = -1
+ local rc = require "rc"
+ for k,v in pairs(rc.cfg.enabled) do
+  pids[v] = -1
+  dprint(v)
  end
-  f:close()
- end
- loadlist()
  while true do
   for k,v in pairs(pids) do
    if not os.taskInfo(v) then
     syslog("Starting service "..k)
-    pids[k] = os.spawnfile("/boot/service/"..k)
+    pids[k] = rc.start(k)
    end
   end
   coroutine.yield()

service/getty.lua

@@ -1,4 +1,5 @@
 local gpus,screens,ttyn,pids = {}, {}, 0, {}
+local basepid = nil
 local shell = require "shell"
 local function scan()
  local w,di = pcall(computer.getDeviceInfo)
@@ -53,9 +54,11 @@ local function allocate()
  end
 end
 
+function start()
 scan()
 allocate()
 dprint("screens ready")
+basepid = os.spawn(function()
 while true do
  coroutine.yield()
  for k,v in pairs(pids) do
@@ -66,3 +69,10 @@ while true do
   end
  end
 end
+end,"getty")
+return basepid
+end
+function stop()
+ os.kill(basepid)
+ basepid = nil
+end