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// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// run is a simple wrapper for exec.Run/Close
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func run(envv []string, dir string, argv ...string) os.Error {
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log.Println("run", argv)
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bin, err := pathLookup(argv[0])
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p, err := exec.Run(bin, argv, envv, dir,
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exec.DevNull, exec.DevNull, exec.PassThrough)
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// runLog runs a process and returns the combined stdout/stderr,
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// as well as writing it to logfile (if specified).
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func runLog(envv []string, logfile, dir string, argv ...string) (output string, exitStatus int, err os.Error) {
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log.Println("runLog", argv)
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bin, err := pathLookup(argv[0])
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p, err := exec.Run(bin, argv, envv, dir,
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exec.DevNull, exec.Pipe, exec.MergeWithStdout)
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b := new(bytes.Buffer)
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f, err := os.Open(logfile, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644)
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w = io.MultiWriter(f, b)
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_, err = io.Copy(w, p.Stdout)
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wait, err := p.Wait(0)
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return b.String(), wait.WaitStatus.ExitStatus(), nil
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// Find bin in PATH if a relative or absolute path hasn't been specified
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func pathLookup(s string) (string, os.Error) {
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if strings.HasPrefix(s, "/") || strings.HasPrefix(s, "./") || strings.HasPrefix(s, "../") {
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return exec.LookPath(s)