github.com/raghuse92/packer@v1.3.2/builder/qemu/step_configure_vnc.go (about)

     1  package qemu
     2  
     3  import (
     4  	"context"
     5  	"fmt"
     6  	"log"
     7  	"math/rand"
     8  	"net"
     9  
    10  	"github.com/hashicorp/packer/helper/multistep"
    11  	"github.com/hashicorp/packer/packer"
    12  )
    13  
    14  // This step configures the VM to enable the VNC server.
    15  //
    16  // Uses:
    17  //   config *config
    18  //   ui     packer.Ui
    19  //
    20  // Produces:
    21  //   vnc_port uint - The port that VNC is configured to listen on.
    22  type stepConfigureVNC struct{}
    23  
    24  func (stepConfigureVNC) Run(_ context.Context, state multistep.StateBag) multistep.StepAction {
    25  	config := state.Get("config").(*Config)
    26  	ui := state.Get("ui").(packer.Ui)
    27  
    28  	// Find an open VNC port. Note that this can still fail later on
    29  	// because we have to release the port at some point. But this does its
    30  	// best.
    31  	msg := fmt.Sprintf("Looking for available port between %d and %d on %s", config.VNCPortMin, config.VNCPortMax, config.VNCBindAddress)
    32  	ui.Say(msg)
    33  	log.Print(msg)
    34  	var vncPort uint
    35  	portRange := int(config.VNCPortMax - config.VNCPortMin)
    36  	for {
    37  		if portRange > 0 {
    38  			vncPort = uint(rand.Intn(portRange)) + config.VNCPortMin
    39  		} else {
    40  			vncPort = config.VNCPortMin
    41  		}
    42  
    43  		log.Printf("Trying port: %d", vncPort)
    44  		l, err := net.Listen("tcp", fmt.Sprintf("%s:%d", config.VNCBindAddress, vncPort))
    45  		if err == nil {
    46  			defer l.Close()
    47  			break
    48  		}
    49  	}
    50  
    51  	log.Printf("Found available VNC port: %d on IP: %s", vncPort, config.VNCBindAddress)
    52  	state.Put("vnc_port", vncPort)
    53  	state.Put("vnc_ip", config.VNCBindAddress)
    54  
    55  	return multistep.ActionContinue
    56  }
    57  
    58  func (stepConfigureVNC) Cleanup(multistep.StateBag) {}