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connhelper: fix cmd.Wait() race 

Fix #1336

Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp>
This commit is contained in:
Akihiro Suda 2018-09-06 01:28:50 +09:00
parent 0198955105
commit a22853e64d
1 changed files with 14 additions and 2 deletions
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16
cli/connhelper/connhelper.go
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@ -82,6 +82,7 @@ func newCommandConn(ctx context.Context, cmd string, args ...string) (net.Conn,
// commandConn implements net.Conn
type commandConn struct {
cmd *exec.Cmd
cmdMutex sync.Mutex
stdin io.WriteCloser
stdout io.ReadCloser
stderrMu sync.Mutex
@ -102,6 +103,7 @@ func (c *commandConn) killIfStdioClosed() error {
return nil
}
var err error
c.cmdMutex.Lock()
// NOTE: maybe already killed here
if err = c.cmd.Process.Kill(); err == nil {
err = c.cmd.Wait()
@ -113,11 +115,14 @@ func (c *commandConn) killIfStdioClosed() error {
err = nil
}
}
c.cmdMutex.Unlock()
return err
}
func (c *commandConn) onEOF(eof error) error {
c.cmdMutex.Lock()
werr := c.cmd.Wait()
c.cmdMutex.Unlock()
if werr == nil {
return eof
}
@ -131,6 +136,7 @@ func ignorableCloseError(err error) bool {
errS := err.Error()
ss := []string{
os.ErrClosed.Error(),
"process already finished",
}
for _, s := range ss {
if strings.Contains(errS, s) {
@ -148,7 +154,10 @@ func (c *commandConn) CloseRead() error {
c.stdioClosedMu.Lock()
c.stdoutClosed = true
c.stdioClosedMu.Unlock()
return c.killIfStdioClosed()
if err := c.killIfStdioClosed(); err != nil && !ignorableCloseError(err) {
logrus.Warnf("commandConn.CloseRead: %v", err)
}
return nil
}
func (c *commandConn) Read(p []byte) (int, error) {
@ -167,7 +176,10 @@ func (c *commandConn) CloseWrite() error {
c.stdioClosedMu.Lock()
c.stdinClosed = true
c.stdioClosedMu.Unlock()
return c.killIfStdioClosed()
if err := c.killIfStdioClosed(); err != nil && !ignorableCloseError(err) {
logrus.Warnf("commandConn.CloseWrite: %v", err)
}
return nil
}
func (c *commandConn) Write(p []byte) (int, error) {