1 files changed, 15 insertions(+), 1 deletions(-)

M cmd.go

@@ 47,6 47,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"os"
 	"os/exec"
 	"sync"
 	"syscall"


@@ 94,6 95,8 @@ type Cmd struct {
 	stderrBuf       *OutputBuffer
 	stdoutStream    *OutputStream
 	stderrStream    *OutputStream
+	stdoutFile      *os.File
+	stderrFile      *os.File
 	status          Status
 	statusChan      chan Status   // nil until Start() called
 	doneChan        chan struct{} // closed when done running


@@ 153,6 156,9 @@ type Options struct {
 	// streaming channels, else lines are dropped silently.
 	Streaming bool
 
+	// If File is set, Cmd.Stdout and Cmd.Stderr are written directly to it.
+	File *os.File
+
 	// BeforeExec is a list of functions called immediately before starting
 	// the real command. These functions can be used to customize the underlying
 	// os/exec.Cmd. For example, to set SysProcAttr.


@@ 203,6 209,11 @@ func NewCmdOptions(options Options, name string, args ...string) *Cmd {
 		c.stderrStream.SetLineBufferSize(int(options.LineBufferSize))
 	}
 
+	if options.File != nil {
+		c.stdoutFile = options.File
+		c.stderrFile = options.File
+	}
+
 	if len(options.BeforeExec) > 0 {
 		c.beforeExecFuncs = []func(cmd *exec.Cmd){}
 		for _, f := range options.BeforeExec {


@@ 409,7 420,7 @@ func (c *Cmd) run(in io.Reader) {
 	// Set exec.Cmd.Stdout and .Stderr to our concurrent-safe stdout/stderr
 	// buffer, stream both, or neither
 	switch {
-	case c.stdoutBuf != nil && c.stdoutStream != nil: // buffer and stream
+	case c.stdoutBuf != nil && c.stdoutStream != nil && c.stdoutFile != nil: // buffer and stream
 		cmd.Stdout = io.MultiWriter(c.stdoutStream, c.stdoutBuf)
 		cmd.Stderr = io.MultiWriter(c.stderrStream, c.stderrBuf)
 	case c.stdoutBuf != nil: // buffer only


@@ 418,6 429,9 @@ func (c *Cmd) run(in io.Reader) {
 	case c.stdoutStream != nil: // stream only
 		cmd.Stdout = c.stdoutStream
 		cmd.Stderr = c.stderrStream
+	case c.stdoutFile != nil: // file only
+		cmd.Stdout = c.stdoutFile
+		cmd.Stderr = c.stderrFile
 	default: // no output (cmd >/dev/null 2>&1)
 		cmd.Stdout = nil
 		cmd.Stderr = nil