54 lines
1.3 KiB
Go
54 lines
1.3 KiB
Go
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package qemu
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import (
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"fmt"
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"github.com/mitchellh/multistep"
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"github.com/mitchellh/packer/packer"
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"log"
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"math/rand"
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"net"
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)
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// This step configures the VM to enable the VNC server.
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//
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// Uses:
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// config *config
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// ui packer.Ui
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//
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// Produces:
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// vnc_port uint - The port that VNC is configured to listen on.
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type stepConfigureVNC struct{}
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func (stepConfigureVNC) Run(state multistep.StateBag) multistep.StepAction {
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config := state.Get("config").(*config)
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ui := state.Get("ui").(packer.Ui)
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// Find an open VNC port. Note that this can still fail later on
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// because we have to release the port at some point. But this does its
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// best.
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msg := fmt.Sprintf("Looking for available port between %d and %d", config.VNCPortMin, config.VNCPortMax)
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ui.Say(msg)
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log.Printf(msg)
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var vncPort uint
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portRange := int(config.VNCPortMax - config.VNCPortMin)
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for {
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vncPort = uint(rand.Intn(portRange)) + config.VNCPortMin
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log.Printf("Trying port: %d", vncPort)
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l, err := net.Listen("tcp", fmt.Sprintf(":%d", vncPort))
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if err == nil {
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defer l.Close()
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break
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}
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}
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msg = fmt.Sprintf("Found available VNC port: %d", vncPort)
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ui.Say(msg)
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log.Printf(msg)
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state.Put("vnc_port", vncPort)
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return multistep.ActionContinue
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}
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func (stepConfigureVNC) Cleanup(multistep.StateBag) {}
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