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moby--moby/daemon/container.go
Brian Goff 6a70fd222b Move mount parsing to separate package.
This moves the platform specific stuff in a separate package and keeps
the `volume` package and the defined interfaces light to import.

Signed-off-by: Brian Goff <cpuguy83@gmail.com>
2018-04-19 06:35:54 -04:00

358 lines
11 KiB
Go

package daemon // import "github.com/docker/docker/daemon"
import (
"fmt"
"os"
"path"
"path/filepath"
"runtime"
"strings"
"time"
containertypes "github.com/docker/docker/api/types/container"
"github.com/docker/docker/api/types/strslice"
"github.com/docker/docker/container"
"github.com/docker/docker/daemon/network"
"github.com/docker/docker/errdefs"
"github.com/docker/docker/image"
"github.com/docker/docker/opts"
"github.com/docker/docker/pkg/signal"
"github.com/docker/docker/pkg/system"
"github.com/docker/docker/pkg/truncindex"
"github.com/docker/docker/runconfig"
volumemounts "github.com/docker/docker/volume/mounts"
"github.com/docker/go-connections/nat"
"github.com/opencontainers/selinux/go-selinux/label"
"github.com/pkg/errors"
)
// GetContainer looks for a container using the provided information, which could be
// one of the following inputs from the caller:
// - A full container ID, which will exact match a container in daemon's list
// - A container name, which will only exact match via the GetByName() function
// - A partial container ID prefix (e.g. short ID) of any length that is
// unique enough to only return a single container object
// If none of these searches succeed, an error is returned
func (daemon *Daemon) GetContainer(prefixOrName string) (*container.Container, error) {
if len(prefixOrName) == 0 {
return nil, errors.WithStack(invalidIdentifier(prefixOrName))
}
if containerByID := daemon.containers.Get(prefixOrName); containerByID != nil {
// prefix is an exact match to a full container ID
return containerByID, nil
}
// GetByName will match only an exact name provided; we ignore errors
if containerByName, _ := daemon.GetByName(prefixOrName); containerByName != nil {
// prefix is an exact match to a full container Name
return containerByName, nil
}
containerID, indexError := daemon.idIndex.Get(prefixOrName)
if indexError != nil {
// When truncindex defines an error type, use that instead
if indexError == truncindex.ErrNotExist {
return nil, containerNotFound(prefixOrName)
}
return nil, errdefs.System(indexError)
}
return daemon.containers.Get(containerID), nil
}
// checkContainer make sure the specified container validates the specified conditions
func (daemon *Daemon) checkContainer(container *container.Container, conditions ...func(*container.Container) error) error {
for _, condition := range conditions {
if err := condition(container); err != nil {
return err
}
}
return nil
}
// Exists returns a true if a container of the specified ID or name exists,
// false otherwise.
func (daemon *Daemon) Exists(id string) bool {
c, _ := daemon.GetContainer(id)
return c != nil
}
// IsPaused returns a bool indicating if the specified container is paused.
func (daemon *Daemon) IsPaused(id string) bool {
c, _ := daemon.GetContainer(id)
return c.State.IsPaused()
}
func (daemon *Daemon) containerRoot(id string) string {
return filepath.Join(daemon.repository, id)
}
// Load reads the contents of a container from disk
// This is typically done at startup.
func (daemon *Daemon) load(id string) (*container.Container, error) {
container := daemon.newBaseContainer(id)
if err := container.FromDisk(); err != nil {
return nil, err
}
if err := label.ReserveLabel(container.ProcessLabel); err != nil {
return nil, err
}
if container.ID != id {
return container, fmt.Errorf("Container %s is stored at %s", container.ID, id)
}
return container, nil
}
// Register makes a container object usable by the daemon as <container.ID>
func (daemon *Daemon) Register(c *container.Container) error {
// Attach to stdout and stderr
if c.Config.OpenStdin {
c.StreamConfig.NewInputPipes()
} else {
c.StreamConfig.NewNopInputPipe()
}
// once in the memory store it is visible to other goroutines
// grab a Lock until it has been checkpointed to avoid races
c.Lock()
defer c.Unlock()
daemon.containers.Add(c.ID, c)
daemon.idIndex.Add(c.ID)
return c.CheckpointTo(daemon.containersReplica)
}
func (daemon *Daemon) newContainer(name string, operatingSystem string, config *containertypes.Config, hostConfig *containertypes.HostConfig, imgID image.ID, managed bool) (*container.Container, error) {
var (
id string
err error
noExplicitName = name == ""
)
id, name, err = daemon.generateIDAndName(name)
if err != nil {
return nil, err
}
if hostConfig.NetworkMode.IsHost() {
if config.Hostname == "" {
config.Hostname, err = os.Hostname()
if err != nil {
return nil, errdefs.System(err)
}
}
} else {
daemon.generateHostname(id, config)
}
entrypoint, args := daemon.getEntrypointAndArgs(config.Entrypoint, config.Cmd)
base := daemon.newBaseContainer(id)
base.Created = time.Now().UTC()
base.Managed = managed
base.Path = entrypoint
base.Args = args //FIXME: de-duplicate from config
base.Config = config
base.HostConfig = &containertypes.HostConfig{}
base.ImageID = imgID
base.NetworkSettings = &network.Settings{IsAnonymousEndpoint: noExplicitName}
base.Name = name
base.Driver = daemon.imageService.GraphDriverForOS(operatingSystem)
base.OS = operatingSystem
return base, err
}
// GetByName returns a container given a name.
func (daemon *Daemon) GetByName(name string) (*container.Container, error) {
if len(name) == 0 {
return nil, fmt.Errorf("No container name supplied")
}
fullName := name
if name[0] != '/' {
fullName = "/" + name
}
id, err := daemon.containersReplica.Snapshot().GetID(fullName)
if err != nil {
return nil, fmt.Errorf("Could not find entity for %s", name)
}
e := daemon.containers.Get(id)
if e == nil {
return nil, fmt.Errorf("Could not find container for entity id %s", id)
}
return e, nil
}
// newBaseContainer creates a new container with its initial
// configuration based on the root storage from the daemon.
func (daemon *Daemon) newBaseContainer(id string) *container.Container {
return container.NewBaseContainer(id, daemon.containerRoot(id))
}
func (daemon *Daemon) getEntrypointAndArgs(configEntrypoint strslice.StrSlice, configCmd strslice.StrSlice) (string, []string) {
if len(configEntrypoint) != 0 {
return configEntrypoint[0], append(configEntrypoint[1:], configCmd...)
}
return configCmd[0], configCmd[1:]
}
func (daemon *Daemon) generateHostname(id string, config *containertypes.Config) {
// Generate default hostname
if config.Hostname == "" {
config.Hostname = id[:12]
}
}
func (daemon *Daemon) setSecurityOptions(container *container.Container, hostConfig *containertypes.HostConfig) error {
container.Lock()
defer container.Unlock()
return daemon.parseSecurityOpt(container, hostConfig)
}
func (daemon *Daemon) setHostConfig(container *container.Container, hostConfig *containertypes.HostConfig) error {
// Do not lock while creating volumes since this could be calling out to external plugins
// Don't want to block other actions, like `docker ps` because we're waiting on an external plugin
if err := daemon.registerMountPoints(container, hostConfig); err != nil {
return err
}
container.Lock()
defer container.Unlock()
// Register any links from the host config before starting the container
if err := daemon.registerLinks(container, hostConfig); err != nil {
return err
}
runconfig.SetDefaultNetModeIfBlank(hostConfig)
container.HostConfig = hostConfig
return container.CheckpointTo(daemon.containersReplica)
}
// verifyContainerSettings performs validation of the hostconfig and config
// structures.
func (daemon *Daemon) verifyContainerSettings(platform string, hostConfig *containertypes.HostConfig, config *containertypes.Config, update bool) ([]string, error) {
// First perform verification of settings common across all platforms.
if config != nil {
if config.WorkingDir != "" {
wdInvalid := false
if runtime.GOOS == platform {
config.WorkingDir = filepath.FromSlash(config.WorkingDir) // Ensure in platform semantics
if !system.IsAbs(config.WorkingDir) {
wdInvalid = true
}
} else {
// LCOW. Force Unix semantics
config.WorkingDir = strings.Replace(config.WorkingDir, string(os.PathSeparator), "/", -1)
if !path.IsAbs(config.WorkingDir) {
wdInvalid = true
}
}
if wdInvalid {
return nil, fmt.Errorf("the working directory '%s' is invalid, it needs to be an absolute path", config.WorkingDir)
}
}
if len(config.StopSignal) > 0 {
_, err := signal.ParseSignal(config.StopSignal)
if err != nil {
return nil, err
}
}
// Validate if Env contains empty variable or not (e.g., ``, `=foo`)
for _, env := range config.Env {
if _, err := opts.ValidateEnv(env); err != nil {
return nil, err
}
}
// Validate the healthcheck params of Config
if config.Healthcheck != nil {
if config.Healthcheck.Interval != 0 && config.Healthcheck.Interval < containertypes.MinimumDuration {
return nil, errors.Errorf("Interval in Healthcheck cannot be less than %s", containertypes.MinimumDuration)
}
if config.Healthcheck.Timeout != 0 && config.Healthcheck.Timeout < containertypes.MinimumDuration {
return nil, errors.Errorf("Timeout in Healthcheck cannot be less than %s", containertypes.MinimumDuration)
}
if config.Healthcheck.Retries < 0 {
return nil, errors.Errorf("Retries in Healthcheck cannot be negative")
}
if config.Healthcheck.StartPeriod != 0 && config.Healthcheck.StartPeriod < containertypes.MinimumDuration {
return nil, errors.Errorf("StartPeriod in Healthcheck cannot be less than %s", containertypes.MinimumDuration)
}
}
}
if hostConfig == nil {
return nil, nil
}
if hostConfig.AutoRemove && !hostConfig.RestartPolicy.IsNone() {
return nil, errors.Errorf("can't create 'AutoRemove' container with restart policy")
}
// Validate mounts; check if host directories still exist
parser := volumemounts.NewParser(platform)
for _, cfg := range hostConfig.Mounts {
if err := parser.ValidateMountConfig(&cfg); err != nil {
return nil, err
}
}
for _, extraHost := range hostConfig.ExtraHosts {
if _, err := opts.ValidateExtraHost(extraHost); err != nil {
return nil, err
}
}
for port := range hostConfig.PortBindings {
_, portStr := nat.SplitProtoPort(string(port))
if _, err := nat.ParsePort(portStr); err != nil {
return nil, errors.Errorf("invalid port specification: %q", portStr)
}
for _, pb := range hostConfig.PortBindings[port] {
_, err := nat.NewPort(nat.SplitProtoPort(pb.HostPort))
if err != nil {
return nil, errors.Errorf("invalid port specification: %q", pb.HostPort)
}
}
}
p := hostConfig.RestartPolicy
switch p.Name {
case "always", "unless-stopped", "no":
if p.MaximumRetryCount != 0 {
return nil, errors.Errorf("maximum retry count cannot be used with restart policy '%s'", p.Name)
}
case "on-failure":
if p.MaximumRetryCount < 0 {
return nil, errors.Errorf("maximum retry count cannot be negative")
}
case "":
// do nothing
default:
return nil, errors.Errorf("invalid restart policy '%s'", p.Name)
}
if !hostConfig.Isolation.IsValid() {
return nil, errors.Errorf("invalid isolation '%s' on %s", hostConfig.Isolation, runtime.GOOS)
}
var (
err error
warnings []string
)
// Now do platform-specific verification
if warnings, err = verifyPlatformContainerSettings(daemon, hostConfig, config, update); err != nil {
return warnings, err
}
if hostConfig.NetworkMode.IsHost() && len(hostConfig.PortBindings) > 0 {
warnings = append(warnings, "Published ports are discarded when using host network mode")
}
return warnings, err
}