// Exists return whether or not the service image already exists
func Exists(ctx context.Context, clt client.ImageAPIClient, image string) (bool, error) {
_, err := InspectImage(ctx, clt, image)
if err != nil {
if client.IsErrImageNotFound(err) {
return false, nil
}
return false, err
}
return true, nil
}
// OutOfSync checks if the container is out of sync with the service definition.
// It looks if the the service hash container label is the same as the computed one.
func (s *Service) OutOfSync(ctx context.Context, c *container.Container) (bool, error) {
if c.ImageConfig() != s.serviceConfig.Image {
logrus.Debugf("Images for %s do not match %s!=%s", c.Name(), c.ImageConfig(), s.serviceConfig.Image)
return true, nil
}
expectedHash := config.GetServiceHash(s.name, s.Config())
if c.Hash() != expectedHash {
logrus.Debugf("Hashes for %s do not match %s!=%s", c.Name(), c.Hash(), expectedHash)
return true, nil
}
image, err := image.InspectImage(ctx, s.clientFactory.Create(s), c.ImageConfig())
if err != nil {
if client.IsErrImageNotFound(err) {
logrus.Debugf("Image %s do not exist, do not know if it's out of sync", c.Image())
return false, nil
}
return false, err
}
logrus.Debugf("Checking existing image name vs id: %s == %s", image.ID, c.Image())
return image.ID != c.Image(), err
}
func createContainer(ctx context.Context, dockerCli *command.DockerCli, config *container.Config, hostConfig *container.HostConfig, networkingConfig *networktypes.NetworkingConfig, cidfile, name string) (*types.ContainerCreateResponse, error) {
stderr := dockerCli.Err()
var containerIDFile *cidFile
if cidfile != "" {
var err error
if containerIDFile, err = newCIDFile(cidfile); err != nil {
return nil, err
}
defer containerIDFile.Close()
}
var trustedRef reference.Canonical
_, ref, err := reference.ParseIDOrReference(config.Image)
if err != nil {
return nil, err
}
if ref != nil {
ref = reference.WithDefaultTag(ref)
if ref, ok := ref.(reference.NamedTagged); ok && command.IsTrusted() {
var err error
trustedRef, err = image.TrustedReference(ctx, dockerCli, ref)
if err != nil {
return nil, err
}
config.Image = trustedRef.String()
}
}
//create the container
response, err := dockerCli.Client().ContainerCreate(ctx, config, hostConfig, networkingConfig, name)
//if image not found try to pull it
if err != nil {
if apiclient.IsErrImageNotFound(err) && ref != nil {
fmt.Fprintf(stderr, "Unable to find image '%s' locally\n", ref.String())
// we don't want to write to stdout anything apart from container.ID
if err = pullImage(ctx, dockerCli, config.Image, stderr); err != nil {
return nil, err
}
if ref, ok := ref.(reference.NamedTagged); ok && trustedRef != nil {
if err := image.TagTrusted(ctx, dockerCli, trustedRef, ref); err != nil {
return nil, err
}
}
// Retry
var retryErr error
response, retryErr = dockerCli.Client().ContainerCreate(ctx, config, hostConfig, networkingConfig, name)
if retryErr != nil {
return nil, retryErr
}
} else {
return nil, err
}
}
for _, warning := range response.Warnings {
fmt.Fprintf(stderr, "WARNING: %s\n", warning)
}
if containerIDFile != nil {
if err = containerIDFile.Write(response.ID); err != nil {
return nil, err
}
}
return &response, nil
}