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/*
Package helper runs external helpers and manages their status and args FDs.
*/
package helper
import (
"errors"
"os/exec"
)
var (
ErrStatusFault = errors.New("generic status pipe fault")
ErrStatusRead = errors.New("unexpected status response")
)
const (
// FortifyHelper is set for the process launched by Helper.
FortifyHelper = "FORTIFY_HELPER"
// FortifyStatus is 1 when sync fd is enabled and 0 otherwise.
FortifyStatus = "FORTIFY_STATUS"
)
type Helper interface {
// StartNotify starts the helper process.
// A status pipe is passed to the helper if ready is not nil.
StartNotify(ready chan error) error
// Start starts the helper process.
Start() error
// Close closes the status pipe.
// If helper is started without the status pipe, Close panics.
Close() error
// Wait calls wait on the child process and cleans up pipes.
Wait() error
// Unwrap returns the underlying exec.Cmd instance.
Unwrap() *exec.Cmd
}
var execCommand = exec.Command
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