packer-cn/builder/common/multistep_debug.go

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package common
import (
"fmt"
"github.com/mitchellh/multistep"
"github.com/mitchellh/packer/packer"
"log"
"time"
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)
// MultistepDebugFn will return a proper multistep.DebugPauseFn to
// use for debugging if you're using multistep in your builder.
func MultistepDebugFn(ui packer.Ui) multistep.DebugPauseFn {
return func(loc multistep.DebugLocation, name string, state map[string]interface{}) {
var locationString string
switch loc {
case multistep.DebugLocationAfterRun:
locationString = "after run of"
case multistep.DebugLocationBeforeCleanup:
locationString = "before cleanup of"
default:
locationString = "at"
}
message := fmt.Sprintf(
"Pausing %s step '%s'. Press any key to continue.",
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locationString, name)
result := make(chan string, 1)
go func() {
line, err := ui.Ask(message)
if err != nil {
log.Printf("Error asking for input: %s", err)
}
result <- line
}()
for {
select {
case <-result:
return
case <-time.After(100 * time.Millisecond):
if _, ok := state[multistep.StateCancelled]; ok {
return
}
}
}
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}
}