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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"bytes"
"io"
"log"
"os"
"os/exec"
)
// run is a simple wrapper for exec.Run/Close
func run(envv []string, dir string, argv ...string) error {
if *verbose {
log.Println("run", argv)
}
cmd := exec.Command(argv[0], argv[1:]...)
cmd.Dir = dir
cmd.Env = envv
cmd.Stderr = os.Stderr
return cmd.Run()
}
// runLog runs a process and returns the combined stdout/stderr,
// as well as writing it to logfile (if specified). It returns
// process combined stdout and stderr output, exit status and error.
// The error returned is nil, if process is started successfully,
// even if exit status is not successful.
func runLog(envv []string, logfile, dir string, argv ...string) (string, int, error) {
if *verbose {
log.Println("runLog", argv)
}
b := new(bytes.Buffer)
var w io.Writer = b
if logfile != "" {
f, err := os.OpenFile(logfile, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0666)
if err != nil {
return "", 0, err
}
defer f.Close()
w = io.MultiWriter(f, b)
}
cmd := exec.Command(argv[0], argv[1:]...)
cmd.Dir = dir
cmd.Env = envv
cmd.Stdout = w
cmd.Stderr = w
startErr := cmd.Start()
if startErr != nil {
return "", 1, startErr
}
exitStatus := 0
if err := cmd.Wait(); err != nil {
exitStatus = 1 // TODO(bradfitz): this is fake. no callers care, so just return a bool instead.
}
return b.String(), exitStatus, nil
}
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