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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) os.Error {
if *verbose {
log.Println("run", argv)
}
bin, err := pathLookup(argv[0])
if err != nil {
return err
}
p, err := exec.Run(bin, argv, envv, dir,
exec.DevNull, exec.DevNull, exec.PassThrough)
if err != nil {
return err
}
return p.Close()
}
// runLog runs a process and returns the combined stdout/stderr,
// as well as writing it to logfile (if specified).
func runLog(envv []string, logfile, dir string, argv ...string) (output string, exitStatus int, err os.Error) {
if *verbose {
log.Println("runLog", argv)
}
bin, err := pathLookup(argv[0])
if err != nil {
return
}
p, err := exec.Run(bin, argv, envv, dir,
exec.DevNull, exec.Pipe, exec.MergeWithStdout)
if err != nil {
return
}
defer p.Close()
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
}
defer f.Close()
w = io.MultiWriter(f, b)
}
_, err = io.Copy(w, p.Stdout)
if err != nil {
return
}
wait, err := p.Wait(0)
if err != nil {
return
}
return b.String(), wait.WaitStatus.ExitStatus(), nil
}
// Find bin in PATH if a relative or absolute path hasn't been specified
func pathLookup(s string) (string, os.Error) {
if strings.HasPrefix(s, "/") || strings.HasPrefix(s, "./") || strings.HasPrefix(s, "../") {
return s, nil
}
return exec.LookPath(s)
}
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