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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"
"exec"
"io"
"log"
"os"
"strings"
)
// run is a simple wrapper for exec.Run/Close
func run(envv []string, dir string, argv ...string) error {
if *verbose {
log.Println("run", argv)
}
argv = useBash(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 0.
func runLog(envv []string, logfile, dir string, argv ...string) (string, int, error) {
if *verbose {
log.Println("runLog", argv)
}
argv = useBash(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
err := cmd.Run()
if err != nil {
if ws, ok := err.(*exec.ExitError); ok {
return b.String(), ws.ExitStatus(), nil
}
}
return b.String(), 0, nil
}
// useBash prefixes a list of args with 'bash' if the first argument
// is a bash script.
func useBash(argv []string) []string {
// TODO(brainman): choose a more reliable heuristic here.
if strings.HasSuffix(argv[0], ".bash") {
argv = append([]string{"bash"}, argv...)
}
return argv
}
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