106 lines
2.6 KiB
Go
106 lines
2.6 KiB
Go
package lxc
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import (
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"context"
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"errors"
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"fmt"
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"log"
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"strings"
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"time"
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"github.com/hashicorp/packer-plugin-sdk/multistep"
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packersdk "github.com/hashicorp/packer-plugin-sdk/packer"
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)
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type StepWaitInit struct {
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WaitTimeout time.Duration
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}
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func (s *StepWaitInit) Run(ctx context.Context, state multistep.StateBag) multistep.StepAction {
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ui := state.Get("ui").(packersdk.Ui)
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var err error
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cancel := make(chan struct{})
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waitDone := make(chan bool, 1)
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go func() {
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ui.Say("Waiting for container to finish init...")
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err = s.waitForInit(state, cancel)
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waitDone <- true
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}()
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log.Printf("Waiting for container to finish init, up to timeout: %s", s.WaitTimeout)
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timeout := time.After(s.WaitTimeout)
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WaitLoop:
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for {
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select {
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case <-waitDone:
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if err != nil {
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ui.Error(fmt.Sprintf("Error waiting for container to finish init: %s", err))
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return multistep.ActionHalt
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}
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ui.Say("Container finished init!")
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break WaitLoop
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case <-timeout:
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err := fmt.Errorf("Timeout waiting for container to finish init.")
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state.Put("error", err)
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ui.Error(err.Error())
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close(cancel)
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return multistep.ActionHalt
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case <-time.After(1 * time.Second):
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if _, ok := state.GetOk(multistep.StateCancelled); ok {
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close(cancel)
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log.Println("Interrupt detected, quitting waiting for container to finish init.")
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return multistep.ActionHalt
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}
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}
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}
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return multistep.ActionContinue
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}
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func (s *StepWaitInit) Cleanup(multistep.StateBag) {
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}
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func (s *StepWaitInit) waitForInit(state multistep.StateBag, cancel <-chan struct{}) error {
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config := state.Get("config").(*Config)
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mountPath := state.Get("mount_path").(string)
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wrappedCommand := state.Get("wrappedCommand").(CommandWrapper)
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for {
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select {
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case <-cancel:
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log.Println("Cancelled. Exiting loop.")
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return errors.New("Wait cancelled")
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case <-time.After(1 * time.Second):
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}
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comm := &LxcAttachCommunicator{
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ContainerName: config.ContainerName,
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AttachOptions: config.AttachOptions,
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RootFs: mountPath,
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CmdWrapper: wrappedCommand,
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}
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runlevel, _ := comm.CheckInit()
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currentRunlevel := "unknown"
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if arr := strings.Split(runlevel, " "); len(arr) >= 2 {
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currentRunlevel = arr[1]
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}
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log.Printf("Current runlevel in container: '%s'", runlevel)
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targetRunlevel := fmt.Sprintf("%d", config.TargetRunlevel)
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if currentRunlevel == targetRunlevel {
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log.Printf("Container finished init.")
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break
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} else if currentRunlevel > targetRunlevel {
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log.Printf("Expected Runlevel %s, Got Runlevel %s, continuing", targetRunlevel, currentRunlevel)
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break
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}
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}
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return nil
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}
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