refactor: use ports-get plugn trigger for fetching port mappings

This removes use of ports internals from other plugins, which will make it easier to refactor the underlying property storage.

plugins/ports/Makefile

@@ -1,5 +1,5 @@
 SUBCOMMANDS = subcommands/list subcommands/add subcommands/clear subcommands/remove subcommands/set subcommands/report
-TRIGGERS = triggers/post-certs-remove triggers/post-certs-update triggers/report
+TRIGGERS = triggers/ports-get triggers/post-certs-remove triggers/post-certs-update triggers/report
 BUILD = commands subcommands triggers
 PLUGIN_NAME = ports
 

plugins/ports/src/triggers/triggers.go

@@ -18,6 +18,9 @@ func main() {
 
 	var err error
 	switch trigger {
+	case "ports-get":
+		appName := flag.Arg(0)
+		err = ports.TriggerPortsGet(appName)
 	case "post-certs-remove":
 		appName := flag.Arg(0)
 		err = ports.TriggerPostCertsRemove(appName)

plugins/ports/triggers.go

@@ -1,9 +1,24 @@
 package ports
 
 import (
+	"fmt"
+
 	"github.com/dokku/dokku/plugins/config"
 )
 
+// TriggerPortsGet prints out the port mapping for a given app
+func TriggerPortsGet(appName string) error {
+	for _, portMap := range getPortMaps(appName) {
+		if portMap.AllowsPersistence() {
+			continue
+		}
+
+		fmt.Println(portMap)
+	}
+
+	return nil
+}
+
 // TriggerPostCertsRemove unsets port config vars after SSL cert is added
 func TriggerPostCertsRemove(appName string) error {
 	keys := []string{"DOKKU_PROXY_SSL_PORT"}