cmd_runner_interface.go

package system

import (
	"io"
	"time"
)

type Command struct {
	Name           string
	Args           []string
	Env            map[string]string
	UseIsolatedEnv bool

	WorkingDir string

	// On Linux when enabled inherits process group
	KeepAttached bool

	// Don't echo stdout/stderr
	Quiet bool

	Stdin io.Reader

	// Full stdout and stderr will be captured to memory
	// and returned in the Result unless custom Stdout/Stderr are specified.
	Stdout io.Writer
	Stderr io.Writer
}

type Process interface {
	// Wait is the only way to get back process result information.
	// It must not be called multiple times.
	Wait() <-chan Result

	// TerminateNicely can be called multiple times.
	// It must only be called after Wait().
	TerminateNicely(killGracePeriod time.Duration) error
}

type Result struct {
	// Full stdout and stderr are captured to memory
	Stdout string
	Stderr string

	ExitStatus int
	Error      error
}

type CmdRunner interface {
	// RunComplexCommand returns error as nil:
	//  - command runs and exits with a zero exit status
	// RunComplexCommand returns error:
	//  - command runs and exits with a non-zero exit status
	//  - command does not run
	RunComplexCommand(cmd Command) (stdout, stderr string, exitStatus int, err error)

	RunComplexCommandAsync(cmd Command) (Process, error)

	RunCommand(cmdName string, args ...string) (stdout, stderr string, exitStatus int, err error)

	RunCommandQuietly(cmdName string, args ...string) (stdout, stderr string, exitStatus int, err error)

	RunCommandWithInput(input, cmdName string, args ...string) (stdout, stderr string, exitStatus int, err error)

	CommandExists(cmdName string) (exists bool)
}