packer-cn/packer/communicator.go

53 lines
1.4 KiB
Go

package packer
import (
"io"
"time"
)
// RemoteCmd represents a remote command being prepared or run.
type RemoteCmd struct {
// Command is the command to run remotely. This is executed as if
// it were a shell command, so you are expected to do any shell escaping
// necessary.
Command string
// Stdin specifies the process's standard input. If Stdin is
// nil, the process reads from an empty bytes.Buffer.
Stdin io.Reader
// Stdout and Stderr represent the process's standard output and
// error.
//
// If either is nil, it will be set to ioutil.Discard.
Stdout io.Writer
Stderr io.Writer
// This will be set to true when the remote command has exited. It
// shouldn't be set manually by the user, but there is no harm in
// doing so.
Exited bool
// Once Exited is true, this will contain the exit code of the process.
ExitStatus int
}
// A Communicator is the interface used to communicate with the machine
// that exists that will eventually be packaged into an image. Communicators
// allow you to execute remote commands, upload files, etc.
//
// Communicators must be safe for concurrency, meaning multiple calls to
// Start or any other method may be called at the same time.
type Communicator interface {
Start(*RemoteCmd) error
Upload(string, io.Reader) error
Download(string, io.Writer) error
}
// Wait waits for the remote command to complete.
func (r *RemoteCmd) Wait() {
for !r.Exited {
time.Sleep(50 * time.Millisecond)
}
}