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https://github.com/coreos/mantle.git
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67b9c0de95
Adds a new platform `unprivileged-qemu` which is meant to be ran without root access. It has a restricted set of functionality, such as a lack of the Local cluster and no networking between machines.
97 lines
2.2 KiB
Go
97 lines
2.2 KiB
Go
// Copyright 2015 CoreOS, Inc.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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// exec is extension of the standard os.exec package.
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// Adds a handy dandy interface and assorted other features.
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package exec
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import (
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"context"
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"io"
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"os/exec"
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"syscall"
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)
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var (
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// for equivalence with os/exec
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ErrNotFound = exec.ErrNotFound
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LookPath = exec.LookPath
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)
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// An exec.Cmd compatible interface.
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type Cmd interface {
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// Methods provided by exec.Cmd
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CombinedOutput() ([]byte, error)
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Output() ([]byte, error)
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Run() error
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Start() error
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StderrPipe() (io.ReadCloser, error)
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StdinPipe() (io.WriteCloser, error)
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StdoutPipe() (io.ReadCloser, error)
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Wait() error
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// Simplified wrapper for Process.Kill + Wait
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Kill() error
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// Simplified wrapper for Process.Pid
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Pid() int
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}
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// Basic Cmd implementation based on exec.Cmd
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type ExecCmd struct {
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*exec.Cmd
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cancel context.CancelFunc
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}
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func Command(name string, arg ...string) *ExecCmd {
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return CommandContext(context.Background(), name, arg...)
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}
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func CommandContext(ctx context.Context, name string, arg ...string) *ExecCmd {
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ctx, cancel := context.WithCancel(ctx)
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return &ExecCmd{
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Cmd: exec.CommandContext(ctx, name, arg...),
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cancel: cancel,
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}
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}
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func (cmd *ExecCmd) Kill() error {
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cmd.cancel()
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err := cmd.Wait()
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if err == nil {
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return nil
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}
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if eerr, ok := err.(*exec.ExitError); ok {
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status := eerr.Sys().(syscall.WaitStatus)
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if status.Signal() == syscall.SIGKILL {
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return nil
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}
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}
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return err
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}
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func (cmd *ExecCmd) Pid() int {
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return cmd.Process.Pid
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}
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// IsCmdNotFound reports true if the underlying error was exec.ErrNotFound.
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func IsCmdNotFound(err error) bool {
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if eerr, ok := err.(*exec.Error); ok && eerr.Err == ErrNotFound {
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return true
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}
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return false
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}
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