engine: 'rengine' is a small command-line utility to debug remote engine

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)

engine/rengine/main.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"fmt"
+	"github.com/dotcloud/docker/engine"
+	"github.com/dotcloud/docker/pkg/beam"
+	"net"
+	"os"
+)
+
+func main() {
+	eng := engine.New()
+
+	c, err := net.Dial("unix", "beam.sock")
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "%v\n", err)
+		return
+	}
+	defer c.Close()
+	f, err := c.(*net.UnixConn).File()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "%v\n", err)
+		return
+	}
+
+	child, err := beam.FileConn(f)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "%v\n", err)
+		return
+	}
+	defer child.Close()
+
+	sender := engine.NewSender(child)
+	sender.Install(eng)
+
+	cmd := eng.Job(os.Args[1], os.Args[2:]...)
+	cmd.Stdout.Add(os.Stdout)
+	cmd.Stderr.Add(os.Stderr)
+	if err := cmd.Run(); err != nil {
+		fmt.Fprintf(os.Stderr, "%v\n", err)
+		os.Exit(1)
+	}
+}