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moby--moby/daemon/start_windows.go

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package daemon
import (
"fmt"
"io/ioutil"
"path/filepath"
"strings"
"github.com/docker/docker/container"
"github.com/docker/docker/layer"
"github.com/docker/docker/libcontainerd"
"github.com/docker/docker/pkg/system"
"golang.org/x/sys/windows/registry"
)
const (
credentialSpecRegistryLocation = `SOFTWARE\Microsoft\Windows NT\CurrentVersion\Virtualization\Containers\CredentialSpecs`
credentialSpecFileLocation = "CredentialSpecs"
)
func (daemon *Daemon) getLibcontainerdCreateOptions(container *container.Container) ([]libcontainerd.CreateOption, error) {
createOptions := []libcontainerd.CreateOption{}
// Are we going to run as a Hyper-V container?
hvOpts := &libcontainerd.HyperVIsolationOption{}
if container.HostConfig.Isolation.IsDefault() {
// Container is set to use the default, so take the default from the daemon configuration
hvOpts.IsHyperV = daemon.defaultIsolation.IsHyperV()
} else {
// Container is requesting an isolation mode. Honour it.
hvOpts.IsHyperV = container.HostConfig.Isolation.IsHyperV()
}
dnsSearch := daemon.getDNSSearchSettings(container)
if dnsSearch != nil {
osv := system.GetOSVersion()
if osv.Build < 14997 {
return nil, fmt.Errorf("dns-search option is not supported on the current platform")
}
}
// Generate the layer folder of the layer options
layerOpts := &libcontainerd.LayerOption{}
m, err := container.RWLayer.Metadata()
if err != nil {
return nil, fmt.Errorf("failed to get layer metadata - %s", err)
}
if hvOpts.IsHyperV {
hvOpts.SandboxPath = filepath.Dir(m["dir"])
}
layerOpts.LayerFolderPath = m["dir"]
// Generate the layer paths of the layer options
img, err := daemon.imageStore.Get(container.ImageID)
if err != nil {
return nil, fmt.Errorf("failed to graph.Get on ImageID %s - %s", container.ImageID, err)
}
// Get the layer path for each layer.
max := len(img.RootFS.DiffIDs)
for i := 1; i <= max; i++ {
img.RootFS.DiffIDs = img.RootFS.DiffIDs[:i]
layerPath, err := layer.GetLayerPath(daemon.layerStore, img.RootFS.ChainID())
if err != nil {
return nil, fmt.Errorf("failed to get layer path from graphdriver %s for ImageID %s - %s", daemon.layerStore, img.RootFS.ChainID(), err)
}
// Reverse order, expecting parent most first
layerOpts.LayerPaths = append([]string{layerPath}, layerOpts.LayerPaths...)
}
// Get endpoints for the libnetwork allocated networks to the container
var epList []string
AllowUnqualifiedDNSQuery := false
gwHNSID := ""
if container.NetworkSettings != nil {
for n := range container.NetworkSettings.Networks {
sn, err := daemon.FindNetwork(n)
if err != nil {
continue
}
ep, err := container.GetEndpointInNetwork(sn)
if err != nil {
continue
}
data, err := ep.DriverInfo()
if err != nil {
continue
}
if data["GW_INFO"] != nil {
gwInfo := data["GW_INFO"].(map[string]interface{})
if gwInfo["hnsid"] != nil {
gwHNSID = gwInfo["hnsid"].(string)
}
}
if data["hnsid"] != nil {
epList = append(epList, data["hnsid"].(string))
}
if data["AllowUnqualifiedDNSQuery"] != nil {
AllowUnqualifiedDNSQuery = true
}
}
}
if gwHNSID != "" {
epList = append(epList, gwHNSID)
}
// Read and add credentials from the security options if a credential spec has been provided.
if container.HostConfig.SecurityOpt != nil {
for _, sOpt := range container.HostConfig.SecurityOpt {
sOpt = strings.ToLower(sOpt)
if !strings.Contains(sOpt, "=") {
return nil, fmt.Errorf("invalid security option: no equals sign in supplied value %s", sOpt)
}
var splitsOpt []string
splitsOpt = strings.SplitN(sOpt, "=", 2)
if len(splitsOpt) != 2 {
return nil, fmt.Errorf("invalid security option: %s", sOpt)
}
if splitsOpt[0] != "credentialspec" {
return nil, fmt.Errorf("security option not supported: %s", splitsOpt[0])
}
credentialsOpts := &libcontainerd.CredentialsOption{}
var (
match bool
csValue string
err error
)
if match, csValue = getCredentialSpec("file://", splitsOpt[1]); match {
if csValue == "" {
return nil, fmt.Errorf("no value supplied for file:// credential spec security option")
}
if credentialsOpts.Credentials, err = readCredentialSpecFile(container.ID, daemon.root, filepath.Clean(csValue)); err != nil {
return nil, err
}
} else if match, csValue = getCredentialSpec("registry://", splitsOpt[1]); match {
if csValue == "" {
return nil, fmt.Errorf("no value supplied for registry:// credential spec security option")
}
if credentialsOpts.Credentials, err = readCredentialSpecRegistry(container.ID, csValue); err != nil {
return nil, err
}
} else {
return nil, fmt.Errorf("invalid credential spec security option - value must be prefixed file:// or registry:// followed by a value")
}
createOptions = append(createOptions, credentialsOpts)
}
}
// Now add the remaining options.
createOptions = append(createOptions, &libcontainerd.FlushOption{IgnoreFlushesDuringBoot: !container.HasBeenStartedBefore})
createOptions = append(createOptions, hvOpts)
createOptions = append(createOptions, layerOpts)
if epList != nil {
createOptions = append(createOptions, &libcontainerd.NetworkEndpointsOption{
Endpoints: epList,
AllowUnqualifiedDNSQuery: AllowUnqualifiedDNSQuery,
DNSSearchList: dnsSearch,
})
}
return createOptions, nil
}
// getCredentialSpec is a helper function to get the value of a credential spec supplied
// on the CLI, stripping the prefix
func getCredentialSpec(prefix, value string) (bool, string) {
if strings.HasPrefix(value, prefix) {
return true, strings.TrimPrefix(value, prefix)
}
return false, ""
}
// readCredentialSpecRegistry is a helper function to read a credential spec from
// the registry. If not found, we return an empty string and warn in the log.
// This allows for staging on machines which do not have the necessary components.
func readCredentialSpecRegistry(id, name string) (string, error) {
var (
k registry.Key
err error
val string
)
if k, err = registry.OpenKey(registry.LOCAL_MACHINE, credentialSpecRegistryLocation, registry.QUERY_VALUE); err != nil {
return "", fmt.Errorf("failed handling spec %q for container %s - %s could not be opened", name, id, credentialSpecRegistryLocation)
}
if val, _, err = k.GetStringValue(name); err != nil {
if err == registry.ErrNotExist {
return "", fmt.Errorf("credential spec %q for container %s as it was not found", name, id)
}
return "", fmt.Errorf("error %v reading credential spec %q from registry for container %s", err, name, id)
}
return val, nil
}
// readCredentialSpecFile is a helper function to read a credential spec from
// a file. If not found, we return an empty string and warn in the log.
// This allows for staging on machines which do not have the necessary components.
func readCredentialSpecFile(id, root, location string) (string, error) {
if filepath.IsAbs(location) {
return "", fmt.Errorf("invalid credential spec - file:// path cannot be absolute")
}
base := filepath.Join(root, credentialSpecFileLocation)
full := filepath.Join(base, location)
if !strings.HasPrefix(full, base) {
return "", fmt.Errorf("invalid credential spec - file:// path must be under %s", base)
}
bcontents, err := ioutil.ReadFile(full)
if err != nil {
return "", fmt.Errorf("credential spec '%s' for container %s as the file could not be read: %q", full, id, err)
}
return string(bcontents[:]), nil
}