106 lines
2.5 KiB
Go
106 lines
2.5 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package main
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import (
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"flag"
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"fmt"
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"os"
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"os/exec"
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"syscall"
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"k8s.io/kubernetes/contrib/mesos/pkg/redirfd"
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)
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func main() {
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nonblock := flag.Bool("n", false, "open file in non-blocking mode")
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changemode := flag.Bool("b", false, "change mode of file after opening it: to non-blocking mode if the -n option was not given, to blocking mode if it was")
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flag.Parse()
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args := flag.Args()
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if len(args) < 4 {
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fmt.Fprintf(os.Stderr, "expected {mode} {fd} {file} instead of: %v\n", args)
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os.Exit(1)
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}
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var mode redirfd.RedirectMode
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switch m := args[0]; m {
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case "r":
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mode = redirfd.Read
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case "w":
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mode = redirfd.Write
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case "u":
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mode = redirfd.Update
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case "a":
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mode = redirfd.Append
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case "c":
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mode = redirfd.AppendExisting
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case "x":
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mode = redirfd.WriteNew
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default:
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fmt.Fprintf(os.Stderr, "unrecognized mode %q\n", mode)
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os.Exit(1)
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}
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fd, err := redirfd.ParseFileDescriptor(args[1])
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if err != nil {
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fmt.Fprintf(os.Stderr, "failed to parse file descriptor: %v\n", err)
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os.Exit(1)
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}
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file := args[2]
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f, err := mode.Redirect(*nonblock, *changemode, fd, file)
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if err != nil {
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fmt.Fprintf(os.Stderr, "redirect failed: %q, %v\n", args[1], err)
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os.Exit(1)
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}
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var pargs []string
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if len(args) > 4 {
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pargs = args[4:]
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}
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cmd := exec.Command(args[3], pargs...)
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cmd.Stdin = os.Stdin
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cmd.Stdout = os.Stdout
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cmd.Stderr = os.Stderr
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switch fd {
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case redirfd.Stdin:
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cmd.Stdin = f
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case redirfd.Stdout:
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cmd.Stdout = f
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case redirfd.Stderr:
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cmd.Stderr = f
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default:
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cmd.ExtraFiles = []*os.File{f}
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}
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defer f.Close()
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if err = cmd.Run(); err != nil {
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exiterr := err.(*exec.ExitError)
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state := exiterr.ProcessState
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if state != nil {
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sys := state.Sys()
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if waitStatus, ok := sys.(syscall.WaitStatus); ok {
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if waitStatus.Signaled() {
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os.Exit(256 + int(waitStatus.Signal()))
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} else {
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os.Exit(waitStatus.ExitStatus())
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}
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}
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}
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os.Exit(3)
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}
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}
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