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Fix race on ContainerAttachRaw

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Signed-off-by: Jim Minter <jminter@redhat.com>
This commit is contained in:
Jim Minter 2017-03-15 11:33:04 +00:00
parent 7936a962dc
commit 32ca1214fa
4 changed files with 12 additions and 4 deletions
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2
builder/builder.go
View file

@ -114,7 +114,7 @@ type Backend interface {
// PullOnBuild tells Docker to pull image referenced by `name`.
PullOnBuild(ctx context.Context, name string, authConfigs map[string]types.AuthConfig, output io.Writer) (Image, error)
// ContainerAttachRaw attaches to container.
ContainerAttachRaw(cID string, stdin io.ReadCloser, stdout, stderr io.Writer, stream bool) error
ContainerAttachRaw(cID string, stdin io.ReadCloser, stdout, stderr io.Writer, stream bool, attached chan struct{}) error
// ContainerCreate creates a new Docker container and returns potential warnings
ContainerCreate(config types.ContainerCreateConfig) (container.ContainerCreateCreatedBody, error)
// ContainerRm removes a container specified by `id`.

9
builder/dockerfile/internals.go
View file

@ -573,11 +573,18 @@ func (b *Builder) create() (string, error) {
var errCancelled = errors.New("build cancelled")
func (b *Builder) run(cID string) (err error) {
attached := make(chan struct{})
errCh := make(chan error)
go func() {
errCh <- b.docker.ContainerAttachRaw(cID, nil, b.Stdout, b.Stderr, true)
errCh <- b.docker.ContainerAttachRaw(cID, nil, b.Stdout, b.Stderr, true, attached)
}()
select {
case err := <-errCh:
return err
case <-attached:
}
finished := make(chan struct{})
cancelErrCh := make(chan error, 1)
go func() {

2
builder/dockerfile/mockbackend_test.go
View file

@ -33,7 +33,7 @@ func (m *MockBackend) PullOnBuild(ctx context.Context, name string, authConfigs
return nil, nil
}
func (m *MockBackend) ContainerAttachRaw(cID string, stdin io.ReadCloser, stdout, stderr io.Writer, stream bool) error {
func (m *MockBackend) ContainerAttachRaw(cID string, stdin io.ReadCloser, stdout, stderr io.Writer, stream bool, attached chan struct{}) error {
return nil
}

3
daemon/attach.go
View file

@ -73,7 +73,7 @@ func (daemon *Daemon) ContainerAttach(prefixOrName string, c *backend.ContainerA
}
// ContainerAttachRaw attaches the provided streams to the container's stdio
func (daemon *Daemon) ContainerAttachRaw(prefixOrName string, stdin io.ReadCloser, stdout, stderr io.Writer, doStream bool) error {
func (daemon *Daemon) ContainerAttachRaw(prefixOrName string, stdin io.ReadCloser, stdout, stderr io.Writer, doStream bool, attached chan struct{}) error {
container, err := daemon.GetContainer(prefixOrName)
if err != nil {
return err
@ -86,6 +86,7 @@ func (daemon *Daemon) ContainerAttachRaw(prefixOrName string, stdin io.ReadClose
CloseStdin: container.Config.StdinOnce,
}
container.StreamConfig.AttachStreams(&cfg)
close(attached)
if cfg.UseStdin {
cfg.Stdin = stdin
}