beacon_node: "--version" option [skip ci]

fixes #466

beacon_chain/beacon_node.nim

@@ -915,6 +915,9 @@ when isMainModule:
   randomize()
   let config = BeaconNodeConf.load(version = fullVersionStr())
 
+  if config.showVersion:
+    quit(QuitSuccess)
+
   when compiles(defaultChroniclesStream.output.writer):
     defaultChroniclesStream.output.writer =
       proc (logLevel: LogLevel, msg: LogOutputStr) {.gcsafe.} =
@@ -929,7 +932,7 @@ when isMainModule:
       # workaround for https://github.com/nim-lang/Nim/issues/4057
       setupForeignThreadGc()
     debug "Shutting down after having received SIGINT"
-    quit(1)
+    quit(QuitFailure)
   setControlCHook(controlCHandler)
 
   case config.cmd

beacon_chain/conf.nim

@@ -69,6 +69,10 @@ type
                     "ETH: $attached_validators_balance"
       longform: "status-bar-contents" }: string
 
+    showVersion* {.
+      desc: "Show version and exit."
+      longform: "version" }: bool
+
     case cmd* {.
       command
       defaultValue: noCommand }: StartUpCommand

vendor/nim-confutils

@@ -1 +1 @@
-Subproject commit d9e815fe670b962ae0a7283d18dc030dc42d8b24
+Subproject commit 71643c914110f4549884abd75f22586ee675d98d