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moby--moby/daemon/create.go
Sebastiaan van Stijn e30a4a438b
daemon: remove leftover LCOW platform checks
This removes some of the checks that were added in 0cba7740d4,
but should no longer be needed.

- `Daemon.create()`: fix the error message, which assumed it could only occur on Windows.
- `Daemon.cleanupContainer()`: no need to validate container platform to delete it.
- `Daemon.containerExport`: if a container was created, we should be able to
  export it; no need to validate.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
2022-01-25 15:23:18 +01:00

321 lines
10 KiB
Go

package daemon // import "github.com/docker/docker/daemon"
import (
"fmt"
"net"
"runtime"
"strings"
"time"
"github.com/containerd/containerd/platforms"
"github.com/docker/docker/api/types"
containertypes "github.com/docker/docker/api/types/container"
networktypes "github.com/docker/docker/api/types/network"
"github.com/docker/docker/container"
"github.com/docker/docker/daemon/images"
"github.com/docker/docker/errdefs"
"github.com/docker/docker/image"
"github.com/docker/docker/pkg/idtools"
"github.com/docker/docker/pkg/system"
"github.com/docker/docker/runconfig"
v1 "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/opencontainers/selinux/go-selinux"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
type createOpts struct {
params types.ContainerCreateConfig
managed bool
ignoreImagesArgsEscaped bool
}
// CreateManagedContainer creates a container that is managed by a Service
func (daemon *Daemon) CreateManagedContainer(params types.ContainerCreateConfig) (containertypes.ContainerCreateCreatedBody, error) {
return daemon.containerCreate(createOpts{
params: params,
managed: true,
ignoreImagesArgsEscaped: false})
}
// ContainerCreate creates a regular container
func (daemon *Daemon) ContainerCreate(params types.ContainerCreateConfig) (containertypes.ContainerCreateCreatedBody, error) {
return daemon.containerCreate(createOpts{
params: params,
managed: false,
ignoreImagesArgsEscaped: false})
}
// ContainerCreateIgnoreImagesArgsEscaped creates a regular container. This is called from the builder RUN case
// and ensures that we do not take the images ArgsEscaped
func (daemon *Daemon) ContainerCreateIgnoreImagesArgsEscaped(params types.ContainerCreateConfig) (containertypes.ContainerCreateCreatedBody, error) {
return daemon.containerCreate(createOpts{
params: params,
managed: false,
ignoreImagesArgsEscaped: true})
}
func (daemon *Daemon) containerCreate(opts createOpts) (containertypes.ContainerCreateCreatedBody, error) {
start := time.Now()
if opts.params.Config == nil {
return containertypes.ContainerCreateCreatedBody{}, errdefs.InvalidParameter(errors.New("Config cannot be empty in order to create a container"))
}
warnings, err := daemon.verifyContainerSettings(opts.params.HostConfig, opts.params.Config, false)
if err != nil {
return containertypes.ContainerCreateCreatedBody{Warnings: warnings}, errdefs.InvalidParameter(err)
}
if opts.params.Platform == nil && opts.params.Config.Image != "" {
if img, _ := daemon.imageService.GetImage(opts.params.Config.Image, opts.params.Platform); img != nil {
p := platforms.DefaultSpec()
imgPlat := v1.Platform{
OS: img.OS,
Architecture: img.Architecture,
Variant: img.Variant,
}
if !images.OnlyPlatformWithFallback(p).Match(imgPlat) {
warnings = append(warnings, fmt.Sprintf("The requested image's platform (%s) does not match the detected host platform (%s) and no specific platform was requested", platforms.Format(imgPlat), platforms.Format(p)))
}
}
}
err = verifyNetworkingConfig(opts.params.NetworkingConfig)
if err != nil {
return containertypes.ContainerCreateCreatedBody{Warnings: warnings}, errdefs.InvalidParameter(err)
}
if opts.params.HostConfig == nil {
opts.params.HostConfig = &containertypes.HostConfig{}
}
err = daemon.adaptContainerSettings(opts.params.HostConfig, opts.params.AdjustCPUShares)
if err != nil {
return containertypes.ContainerCreateCreatedBody{Warnings: warnings}, errdefs.InvalidParameter(err)
}
ctr, err := daemon.create(opts)
if err != nil {
return containertypes.ContainerCreateCreatedBody{Warnings: warnings}, err
}
containerActions.WithValues("create").UpdateSince(start)
if warnings == nil {
warnings = make([]string, 0) // Create an empty slice to avoid https://github.com/moby/moby/issues/38222
}
return containertypes.ContainerCreateCreatedBody{ID: ctr.ID, Warnings: warnings}, nil
}
// Create creates a new container from the given configuration with a given name.
func (daemon *Daemon) create(opts createOpts) (retC *container.Container, retErr error) {
var (
ctr *container.Container
img *image.Image
imgID image.ID
err error
os = runtime.GOOS
)
if opts.params.Config.Image != "" {
img, err = daemon.imageService.GetImage(opts.params.Config.Image, opts.params.Platform)
if err != nil {
return nil, err
}
os = img.OperatingSystem()
if !system.IsOSSupported(os) {
return nil, system.ErrNotSupportedOperatingSystem
}
imgID = img.ID()
} else if isWindows {
os = "linux" // 'scratch' case.
}
// On WCOW, if are not being invoked by the builder to create this container (where
// ignoreImagesArgEscaped will be true) - if the image already has its arguments escaped,
// ensure that this is replicated across to the created container to avoid double-escaping
// of the arguments/command line when the runtime attempts to run the container.
if os == "windows" && !opts.ignoreImagesArgsEscaped && img != nil && img.RunConfig().ArgsEscaped {
opts.params.Config.ArgsEscaped = true
}
if err := daemon.mergeAndVerifyConfig(opts.params.Config, img); err != nil {
return nil, errdefs.InvalidParameter(err)
}
if err := daemon.mergeAndVerifyLogConfig(&opts.params.HostConfig.LogConfig); err != nil {
return nil, errdefs.InvalidParameter(err)
}
if ctr, err = daemon.newContainer(opts.params.Name, os, opts.params.Config, opts.params.HostConfig, imgID, opts.managed); err != nil {
return nil, err
}
defer func() {
if retErr != nil {
if err := daemon.cleanupContainer(ctr, true, true); err != nil {
logrus.Errorf("failed to cleanup container on create error: %v", err)
}
}
}()
if err := daemon.setSecurityOptions(ctr, opts.params.HostConfig); err != nil {
return nil, err
}
ctr.HostConfig.StorageOpt = opts.params.HostConfig.StorageOpt
// Set RWLayer for container after mount labels have been set
rwLayer, err := daemon.imageService.CreateLayer(ctr, setupInitLayer(daemon.idMapping))
if err != nil {
return nil, errdefs.System(err)
}
ctr.RWLayer = rwLayer
current := idtools.CurrentIdentity()
if err := idtools.MkdirAndChown(ctr.Root, 0710, idtools.Identity{UID: current.UID, GID: daemon.IdentityMapping().RootPair().GID}); err != nil {
return nil, err
}
if err := idtools.MkdirAndChown(ctr.CheckpointDir(), 0700, current); err != nil {
return nil, err
}
if err := daemon.setHostConfig(ctr, opts.params.HostConfig); err != nil {
return nil, err
}
if err := daemon.createContainerOSSpecificSettings(ctr, opts.params.Config, opts.params.HostConfig); err != nil {
return nil, err
}
var endpointsConfigs map[string]*networktypes.EndpointSettings
if opts.params.NetworkingConfig != nil {
endpointsConfigs = opts.params.NetworkingConfig.EndpointsConfig
}
// Make sure NetworkMode has an acceptable value. We do this to ensure
// backwards API compatibility.
runconfig.SetDefaultNetModeIfBlank(ctr.HostConfig)
daemon.updateContainerNetworkSettings(ctr, endpointsConfigs)
if err := daemon.Register(ctr); err != nil {
return nil, err
}
stateCtr.set(ctr.ID, "stopped")
daemon.LogContainerEvent(ctr, "create")
return ctr, nil
}
func toHostConfigSelinuxLabels(labels []string) []string {
for i, l := range labels {
labels[i] = "label=" + l
}
return labels
}
func (daemon *Daemon) generateSecurityOpt(hostConfig *containertypes.HostConfig) ([]string, error) {
for _, opt := range hostConfig.SecurityOpt {
con := strings.Split(opt, "=")
if con[0] == "label" {
// Caller overrode SecurityOpts
return nil, nil
}
}
ipcMode := hostConfig.IpcMode
pidMode := hostConfig.PidMode
privileged := hostConfig.Privileged
if ipcMode.IsHost() || pidMode.IsHost() || privileged {
return toHostConfigSelinuxLabels(selinux.DisableSecOpt()), nil
}
var ipcLabel []string
var pidLabel []string
ipcContainer := ipcMode.Container()
pidContainer := pidMode.Container()
if ipcContainer != "" {
c, err := daemon.GetContainer(ipcContainer)
if err != nil {
return nil, err
}
ipcLabel, err = selinux.DupSecOpt(c.ProcessLabel)
if err != nil {
return nil, err
}
if pidContainer == "" {
return toHostConfigSelinuxLabels(ipcLabel), err
}
}
if pidContainer != "" {
c, err := daemon.GetContainer(pidContainer)
if err != nil {
return nil, err
}
pidLabel, err = selinux.DupSecOpt(c.ProcessLabel)
if err != nil {
return nil, err
}
if ipcContainer == "" {
return toHostConfigSelinuxLabels(pidLabel), err
}
}
if pidLabel != nil && ipcLabel != nil {
for i := 0; i < len(pidLabel); i++ {
if pidLabel[i] != ipcLabel[i] {
return nil, fmt.Errorf("--ipc and --pid containers SELinux labels aren't the same")
}
}
return toHostConfigSelinuxLabels(pidLabel), nil
}
return nil, nil
}
func (daemon *Daemon) mergeAndVerifyConfig(config *containertypes.Config, img *image.Image) error {
if img != nil && img.Config != nil {
if err := merge(config, img.Config); err != nil {
return err
}
}
// Reset the Entrypoint if it is [""]
if len(config.Entrypoint) == 1 && config.Entrypoint[0] == "" {
config.Entrypoint = nil
}
if len(config.Entrypoint) == 0 && len(config.Cmd) == 0 {
return fmt.Errorf("No command specified")
}
return nil
}
// Checks if the client set configurations for more than one network while creating a container
// Also checks if the IPAMConfig is valid
func verifyNetworkingConfig(nwConfig *networktypes.NetworkingConfig) error {
if nwConfig == nil || len(nwConfig.EndpointsConfig) == 0 {
return nil
}
if len(nwConfig.EndpointsConfig) > 1 {
l := make([]string, 0, len(nwConfig.EndpointsConfig))
for k := range nwConfig.EndpointsConfig {
l = append(l, k)
}
return errors.Errorf("Container cannot be connected to network endpoints: %s", strings.Join(l, ", "))
}
for k, v := range nwConfig.EndpointsConfig {
if v == nil {
return errdefs.InvalidParameter(errors.Errorf("no EndpointSettings for %s", k))
}
if v.IPAMConfig != nil {
if v.IPAMConfig.IPv4Address != "" && net.ParseIP(v.IPAMConfig.IPv4Address).To4() == nil {
return errors.Errorf("invalid IPv4 address: %s", v.IPAMConfig.IPv4Address)
}
if v.IPAMConfig.IPv6Address != "" {
n := net.ParseIP(v.IPAMConfig.IPv6Address)
// if the address is an invalid network address (ParseIP == nil) or if it is
// an IPv4 address (To4() != nil), then it is an invalid IPv6 address
if n == nil || n.To4() != nil {
return errors.Errorf("invalid IPv6 address: %s", v.IPAMConfig.IPv6Address)
}
}
}
}
return nil
}