90 lines
2.1 KiB
Go
90 lines
2.1 KiB
Go
package qemu
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import (
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"context"
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"fmt"
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"log"
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"math/rand"
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"github.com/hashicorp/packer/packer"
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"github.com/hashicorp/packer/packer-plugin-sdk/multistep"
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"github.com/hashicorp/packer/packer-plugin-sdk/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 int - The port that VNC is configured to listen on.
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type stepConfigureVNC struct {
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l *net.Listener
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}
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func VNCPassword() string {
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length := int(8)
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charSet := []byte("012345689abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
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charSetLength := len(charSet)
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password := make([]byte, length)
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for i := 0; i < length; i++ {
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password[i] = charSet[rand.Intn(charSetLength)]
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}
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return string(password)
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}
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func (s *stepConfigureVNC) Run(ctx context.Context, 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 on %s", config.VNCPortMin, config.VNCPortMax, config.VNCBindAddress)
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ui.Say(msg)
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log.Print(msg)
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var vncPassword string
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var err error
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s.l, err = net.ListenRangeConfig{
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Addr: config.VNCBindAddress,
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Min: config.VNCPortMin,
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Max: config.VNCPortMax,
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Network: "tcp",
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}.Listen(ctx)
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if err != nil {
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err := fmt.Errorf("Error finding VNC port: %s", err)
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state.Put("error", err)
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ui.Error(err.Error())
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return multistep.ActionHalt
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}
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s.l.Listener.Close() // free port, but don't unlock lock file
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vncPort := s.l.Port
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if config.VNCUsePassword {
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vncPassword = VNCPassword()
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} else {
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vncPassword = ""
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}
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log.Printf("Found available VNC port: %d on IP: %s", vncPort, config.VNCBindAddress)
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state.Put("vnc_port", vncPort)
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state.Put("vnc_password", vncPassword)
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return multistep.ActionContinue
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}
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func (s *stepConfigureVNC) Cleanup(multistep.StateBag) {
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if s.l != nil {
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err := s.l.Close()
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if err != nil {
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log.Printf("failed to unlock port lockfile: %v", err)
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}
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}
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}
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