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subprocess/cmd.go
74 строки
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Billy Keyes
subprocess: trace all command execution
01 июл 2020, 22:13
01 июл 2020, 22:13
f953f1e
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package subprocess import ( "io" "os/exec" ) // Thin wrapper around exec.Cmd. Takes care of pipe shutdown by // keeping an internal reference to any created pipes. Whenever // Cmd.Wait() is called, all created pipes are closed. type Cmd struct { *exec.Cmd pipes []io.Closer } func (c *Cmd) Run() error { c.trace() return c.Cmd.Run() } func (c *Cmd) Start() error { c.trace() return c.Cmd.Start() } func (c *Cmd) Output() ([]byte, error) { c.trace() return c.Cmd.Output() } func (c *Cmd) CombinedOutput() ([]byte, error) { c.trace() return c.Cmd.CombinedOutput() } func (c *Cmd) StdoutPipe() (io.ReadCloser, error) { stdout, err := c.Cmd.StdoutPipe() c.pipes = append(c.pipes, stdout) return stdout, err } func (c *Cmd) StderrPipe() (io.ReadCloser, error) { stderr, err := c.Cmd.StderrPipe() c.pipes = append(c.pipes, stderr) return stderr, err } func (c *Cmd) StdinPipe() (io.WriteCloser, error) { stdin, err := c.Cmd.StdinPipe() c.pipes = append(c.pipes, stdin) return stdin, err } func (c *Cmd) Wait() error { for _, pipe := range c.pipes { pipe.Close() } return c.Cmd.Wait() } func (c *Cmd) trace() { if len(c.Args) > 0 { Trace(c.Args[0], c.Args[1:]...) } else { Trace(c.Path) } } func newCmd(cmd *exec.Cmd) *Cmd { wrapped := &Cmd{Cmd: cmd} return wrapped }