Configurable background task execution

task/task.go

@@ -1,6 +1,7 @@
 package task
 
 import (
+	"github.com/aptly-dev/aptly/aptly"
 	"sync/atomic"
 )
 
@@ -20,7 +21,7 @@ type PublishDetail struct {
 }
 
 // Process is a function implementing the actual task logic
-type Process func(out *Output, detail *Detail) error
+type Process func(out aptly.Progress, detail *Detail) (int, error)
 
 const (
 	// IDLE when task is waiting
@@ -35,12 +36,13 @@ const (
 
 // Task represents as task in a queue encapsulates process code
 type Task struct {
-	output  *Output
-	detail  *Detail
-	process Process
-	Name    string
-	ID      int
-	State   State
+	output            *Output
+	detail            *Detail
+	process           Process
+	processReturnCode int
+	Name              string
+	ID                int
+	State             State
 }
 
 // NewTask creates new task