| 102 | } |
| 103 | |
| 104 | func (d *Process) startProcess() error { |
| 105 | var ( |
| 106 | buf bytes.Buffer |
| 107 | |
| 108 | pr, pw = io.Pipe() |
| 109 | // Wrap our buffer in a limiter to |
| 110 | // avoid ballooning our memory use over time. |
| 111 | psw = &xio.PrefixSuffixWriter{ |
| 112 | N: 1 << 10, |
| 113 | W: &buf, |
| 114 | } |
| 115 | |
| 116 | w = &xio.SyncWriter{W: pw} |
| 117 | out = &xio.SyncWriter{W: psw} |
| 118 | |
| 119 | mw = io.MultiWriter(w, out) |
| 120 | cmd = d.cmd |
| 121 | ) |
| 122 | |
| 123 | cmd.SetStdout(mw) |
| 124 | cmd.SetStderr(mw) |
| 125 | |
| 126 | go scanIntoLog(d.ctx, d.log, bufio.NewScanner(pr), d.binName) |
| 127 | |
| 128 | err := d.cmd.Start() |
| 129 | if err != nil { |
| 130 | return xerrors.Errorf("start: %w", err) |
| 131 | } |
| 132 | |
| 133 | userKilled := d.userKilled |
| 134 | |
| 135 | go func() { |
| 136 | defer d.cancel() |
| 137 | defer close(d.waitCh) |
| 138 | |
| 139 | err := cmd.Wait() |
| 140 | _ = psw.Flush() |
| 141 | |
| 142 | // If the user killed the application the actual error returned |
| 143 | // from wait doesn't really matter. |
| 144 | if atomic.LoadInt64(userKilled) == 1 { |
| 145 | d.waitCh <- ErrUserKilled |
| 146 | return |
| 147 | } |
| 148 | |
| 149 | if err == nil { |
| 150 | d.waitCh <- nil |
| 151 | } else { |
| 152 | d.waitCh <- xerrors.Errorf("%s: %w", buf.Bytes(), err) |
| 153 | } |
| 154 | }() |
| 155 | return nil |
| 156 | } |
| 157 | |
| 158 | func (d *Process) kill(sig syscall.Signal) error { |
| 159 | if d.cmd.OSProcess() == nil { |