58 lines
1.4 KiB
Go
58 lines
1.4 KiB
Go
package qemu
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import (
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"fmt"
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"log"
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"math/rand"
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"net"
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"github.com/mitchellh/multistep"
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"github.com/mitchellh/packer/packer"
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)
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// This step adds a NAT port forwarding definition so that SSH is available
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// on the guest machine.
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//
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// Uses:
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//
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// Produces:
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type stepForwardSSH struct{}
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func (s *stepForwardSSH) 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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log.Printf("Looking for available communicator (SSH, WinRM, etc) port between %d and %d", config.SSHHostPortMin, config.SSHHostPortMax)
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var sshHostPort uint
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var offset uint = 0
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portRange := int(config.SSHHostPortMax - config.SSHHostPortMin)
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if portRange > 0 {
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// Have to check if > 0 to avoid a panic
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offset = uint(rand.Intn(portRange))
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}
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for {
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sshHostPort = offset + config.SSHHostPortMin
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if sshHostPort >= config.SSHHostPortMax {
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offset = 0
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sshHostPort = config.SSHHostPortMin
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}
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log.Printf("Trying port: %d", sshHostPort)
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l, err := net.Listen("tcp", fmt.Sprintf(":%d", sshHostPort))
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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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offset++
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}
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ui.Say(fmt.Sprintf("Found port for communicator (SSH, WinRM, etc): %d.", sshHostPort))
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// Save the port we're using so that future steps can use it
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state.Put("sshHostPort", sshHostPort)
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return multistep.ActionContinue
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}
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func (s *stepForwardSSH) Cleanup(state multistep.StateBag) {}
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