Merge pull request #1245 from slingamn/issue1244

fix #1244

conventional.yaml

         # users to do session resumption / query history after disconnections.
         grace-period: 1h
 
-    # options to store history messages in a persistent database (currently only MySQL):
+    # options to store history messages in a persistent database (currently only MySQL).
+    # in order to enable any of this functionality, you must configure a MySQL server
+    # in the `datastore.mysql` section.
     persistent:
         enabled: false
 

default.yaml

         # users to do session resumption / query history after disconnections.
         grace-period: 1h
 
-    # options to store history messages in a persistent database (currently only MySQL):
+    # options to store history messages in a persistent database (currently only MySQL).
+    # in order to enable any of this functionality, you must configure a MySQL server
+    # in the `datastore.mysql` section.
     persistent:
         enabled: false
 

irc/config.go

 	}
 
 	if !config.History.Enabled || !config.History.Persistent.Enabled {
+		config.History.Persistent.Enabled = false
 		config.History.Persistent.UnregisteredChannels = false
 		config.History.Persistent.RegisteredChannels = PersistentDisabled
 		config.History.Persistent.DirectMessages = PersistentDisabled
 	}
 
+	if config.History.Persistent.Enabled && !config.Datastore.MySQL.Enabled {
+		return nil, fmt.Errorf("You must configure a MySQL server in order to enable persistent history")
+	}
+
 	if config.History.ZNCMax == 0 {
 		config.History.ZNCMax = config.History.ChathistoryMax
 	}

irc/handlers.go

 	rb.Add(nil, server.name, RPL_INFO, nick, fmt.Sprintf(client.t("This is Oragono version %s."), SemVer))
 	if Commit != "" {
 		rb.Add(nil, server.name, RPL_INFO, nick, fmt.Sprintf(client.t("It was built from git hash %s."), Commit))
-		rb.Add(nil, server.name, RPL_INFO, nick, fmt.Sprintf(client.t("It was compiled using %s."), runtime.Version()))
 	}
+	rb.Add(nil, server.name, RPL_INFO, nick, fmt.Sprintf(client.t("It was compiled using %s."), runtime.Version()))
 	rb.Add(nil, server.name, RPL_INFO, nick, "")
 	rb.Add(nil, server.name, RPL_INFO, nick, client.t("Oragono is released under the MIT license."))
 	rb.Add(nil, server.name, RPL_INFO, nick, "")