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package runconfig
import (
"encoding/json"
"io"
"github.com/docker/docker/api/types/container"
networktypes "github.com/docker/docker/api/types/network"
"github.com/docker/docker/pkg/sysinfo"
"github.com/docker/docker/volume"
"github.com/pkg/errors"
)
// ContainerDecoder implements httputils.ContainerDecoder
// calling DecodeContainerConfig.
type ContainerDecoder struct{}
// DecodeConfig makes ContainerDecoder to implement httputils.ContainerDecoder
func (r ContainerDecoder) DecodeConfig(src io.Reader) (*container.Config, *container.HostConfig, *networktypes.NetworkingConfig, error) {
c, hc, nc, err := decodeContainerConfig(src)
if err != nil {
return nil, nil, nil, err
}
return c, hc, nc, nil
}
// DecodeHostConfig makes ContainerDecoder to implement httputils.ContainerDecoder
func (r ContainerDecoder) DecodeHostConfig(src io.Reader) (*container.HostConfig, error) {
hc, err := decodeHostConfig(src)
if err != nil {
return nil, err
}
return hc, nil
}
// decodeContainerConfig decodes a json encoded config into a ContainerConfigWrapper
// struct and returns both a Config and a HostConfig struct
// Be aware this function is not checking whether the resulted structs are nil,
// it's your business to do so
func decodeContainerConfig(src io.Reader) (*container.Config, *container.HostConfig, *networktypes.NetworkingConfig, error) {
var w ContainerConfigWrapper
decoder := json.NewDecoder(src)
if err := decoder.Decode(&w); err != nil {
return nil, nil, nil, err
}
hc := w.getHostConfig()
// Perform platform-specific processing of Volumes and Binds.
if w.Config != nil && hc != nil {
// Initialize the volumes map if currently nil
if w.Config.Volumes == nil {
w.Config.Volumes = make(map[string]struct{})
}
// Now validate all the volumes and binds
if err := validateMountSettings(w.Config, hc); err != nil {
return nil, nil, nil, err
}
}
// Certain parameters need daemon-side validation that cannot be done
// on the client, as only the daemon knows what is valid for the platform.
if err := validateNetMode(w.Config, hc); err != nil {
return nil, nil, nil, err
}
// Validate isolation
if err := validateIsolation(hc); err != nil {
return nil, nil, nil, err
}
// Validate QoS
if err := validateQoS(hc); err != nil {
return nil, nil, nil, err
}
// Validate Resources
if err := validateResources(hc, sysinfo.New(true)); err != nil {
return nil, nil, nil, err
}
// Validate Privileged
if err := validatePrivileged(hc); err != nil {
return nil, nil, nil, err
}
// Validate ReadonlyRootfs
if err := validateReadonlyRootfs(hc); err != nil {
return nil, nil, nil, err
}
return w.Config, hc, w.NetworkingConfig, nil
}
// validateMountSettings validates each of the volumes and bind settings
// passed by the caller to ensure they are valid.
func validateMountSettings(c *container.Config, hc *container.HostConfig) error {
// it is ok to have len(hc.Mounts) > 0 && (len(hc.Binds) > 0 || len (c.Volumes) > 0 || len (hc.Tmpfs) > 0 )
// Ensure all volumes and binds are valid.
for spec := range c.Volumes {
if _, err := volume.ParseMountRaw(spec, hc.VolumeDriver); err != nil {
return errors.Wrapf(err, "invalid volume spec %q", spec)
}
}
for _, spec := range hc.Binds {
if _, err := volume.ParseMountRaw(spec, hc.VolumeDriver); err != nil {
return errors.Wrapf(err, "invalid bind mount spec %q", spec)
}
}
return nil
}
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