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moby--moby/plugin/backend_linux.go
John Howard 0380fbff37 LCOW: API: Add platform to /images/create and /build
Signed-off-by: John Howard <jhoward@microsoft.com>

This PR has the API changes described in https://github.com/moby/moby/issues/34617.
Specifically, it adds an HTTP header "X-Requested-Platform" which is a JSON-encoded
OCI Image-spec `Platform` structure.

In addition, it renames (almost all) uses of a string variable platform (and associated)
methods/functions to os. This makes it much clearer to disambiguate with the swarm
"platform" which is really os/arch. This is a stepping stone to getting the daemon towards
fully multi-platform/arch-aware, and makes it clear when "operating system" is being
referred to rather than "platform" which is misleadingly used - sometimes in the swarm
meaning, but more often as just the operating system.
2017-10-06 11:44:18 -07:00

836 lines
21 KiB
Go

// +build linux
package plugin
import (
"archive/tar"
"compress/gzip"
"encoding/json"
"io"
"io/ioutil"
"net/http"
"os"
"path"
"path/filepath"
"strings"
"github.com/docker/distribution/manifest/schema2"
"github.com/docker/distribution/reference"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/filters"
"github.com/docker/docker/distribution"
progressutils "github.com/docker/docker/distribution/utils"
"github.com/docker/docker/distribution/xfer"
"github.com/docker/docker/dockerversion"
"github.com/docker/docker/image"
"github.com/docker/docker/layer"
"github.com/docker/docker/pkg/authorization"
"github.com/docker/docker/pkg/chrootarchive"
"github.com/docker/docker/pkg/mount"
"github.com/docker/docker/pkg/pools"
"github.com/docker/docker/pkg/progress"
"github.com/docker/docker/pkg/system"
"github.com/docker/docker/plugin/v2"
refstore "github.com/docker/docker/reference"
digest "github.com/opencontainers/go-digest"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"golang.org/x/net/context"
)
var acceptedPluginFilterTags = map[string]bool{
"enabled": true,
"capability": true,
}
// Disable deactivates a plugin. This means resources (volumes, networks) cant use them.
func (pm *Manager) Disable(refOrID string, config *types.PluginDisableConfig) error {
p, err := pm.config.Store.GetV2Plugin(refOrID)
if err != nil {
return err
}
pm.mu.RLock()
c := pm.cMap[p]
pm.mu.RUnlock()
if !config.ForceDisable && p.GetRefCount() > 0 {
return errors.WithStack(inUseError(p.Name()))
}
for _, typ := range p.GetTypes() {
if typ.Capability == authorization.AuthZApiImplements {
pm.config.AuthzMiddleware.RemovePlugin(p.Name())
}
}
if err := pm.disable(p, c); err != nil {
return err
}
pm.publisher.Publish(EventDisable{Plugin: p.PluginObj})
pm.config.LogPluginEvent(p.GetID(), refOrID, "disable")
return nil
}
// Enable activates a plugin, which implies that they are ready to be used by containers.
func (pm *Manager) Enable(refOrID string, config *types.PluginEnableConfig) error {
p, err := pm.config.Store.GetV2Plugin(refOrID)
if err != nil {
return err
}
c := &controller{timeoutInSecs: config.Timeout}
if err := pm.enable(p, c, false); err != nil {
return err
}
pm.publisher.Publish(EventEnable{Plugin: p.PluginObj})
pm.config.LogPluginEvent(p.GetID(), refOrID, "enable")
return nil
}
// Inspect examines a plugin config
func (pm *Manager) Inspect(refOrID string) (tp *types.Plugin, err error) {
p, err := pm.config.Store.GetV2Plugin(refOrID)
if err != nil {
return nil, err
}
return &p.PluginObj, nil
}
func (pm *Manager) pull(ctx context.Context, ref reference.Named, config *distribution.ImagePullConfig, outStream io.Writer) error {
if outStream != nil {
// Include a buffer so that slow client connections don't affect
// transfer performance.
progressChan := make(chan progress.Progress, 100)
writesDone := make(chan struct{})
defer func() {
close(progressChan)
<-writesDone
}()
var cancelFunc context.CancelFunc
ctx, cancelFunc = context.WithCancel(ctx)
go func() {
progressutils.WriteDistributionProgress(cancelFunc, outStream, progressChan)
close(writesDone)
}()
config.ProgressOutput = progress.ChanOutput(progressChan)
} else {
config.ProgressOutput = progress.DiscardOutput()
}
return distribution.Pull(ctx, ref, config)
}
type tempConfigStore struct {
config []byte
configDigest digest.Digest
}
func (s *tempConfigStore) Put(c []byte) (digest.Digest, error) {
dgst := digest.FromBytes(c)
s.config = c
s.configDigest = dgst
return dgst, nil
}
func (s *tempConfigStore) Get(d digest.Digest) ([]byte, error) {
if d != s.configDigest {
return nil, errNotFound("digest not found")
}
return s.config, nil
}
func (s *tempConfigStore) RootFSAndOSFromConfig(c []byte) (*image.RootFS, layer.OS, error) {
return configToRootFS(c)
}
func computePrivileges(c types.PluginConfig) types.PluginPrivileges {
var privileges types.PluginPrivileges
if c.Network.Type != "null" && c.Network.Type != "bridge" && c.Network.Type != "" {
privileges = append(privileges, types.PluginPrivilege{
Name: "network",
Description: "permissions to access a network",
Value: []string{c.Network.Type},
})
}
if c.IpcHost {
privileges = append(privileges, types.PluginPrivilege{
Name: "host ipc namespace",
Description: "allow access to host ipc namespace",
Value: []string{"true"},
})
}
if c.PidHost {
privileges = append(privileges, types.PluginPrivilege{
Name: "host pid namespace",
Description: "allow access to host pid namespace",
Value: []string{"true"},
})
}
for _, mount := range c.Mounts {
if mount.Source != nil {
privileges = append(privileges, types.PluginPrivilege{
Name: "mount",
Description: "host path to mount",
Value: []string{*mount.Source},
})
}
}
for _, device := range c.Linux.Devices {
if device.Path != nil {
privileges = append(privileges, types.PluginPrivilege{
Name: "device",
Description: "host device to access",
Value: []string{*device.Path},
})
}
}
if c.Linux.AllowAllDevices {
privileges = append(privileges, types.PluginPrivilege{
Name: "allow-all-devices",
Description: "allow 'rwm' access to all devices",
Value: []string{"true"},
})
}
if len(c.Linux.Capabilities) > 0 {
privileges = append(privileges, types.PluginPrivilege{
Name: "capabilities",
Description: "list of additional capabilities required",
Value: c.Linux.Capabilities,
})
}
return privileges
}
// Privileges pulls a plugin config and computes the privileges required to install it.
func (pm *Manager) Privileges(ctx context.Context, ref reference.Named, metaHeader http.Header, authConfig *types.AuthConfig) (types.PluginPrivileges, error) {
// create image store instance
cs := &tempConfigStore{}
// DownloadManager not defined because only pulling configuration.
pluginPullConfig := &distribution.ImagePullConfig{
Config: distribution.Config{
MetaHeaders: metaHeader,
AuthConfig: authConfig,
RegistryService: pm.config.RegistryService,
ImageEventLogger: func(string, string, string) {},
ImageStore: cs,
},
Schema2Types: distribution.PluginTypes,
}
if err := pm.pull(ctx, ref, pluginPullConfig, nil); err != nil {
return nil, err
}
if cs.config == nil {
return nil, errors.New("no configuration pulled")
}
var config types.PluginConfig
if err := json.Unmarshal(cs.config, &config); err != nil {
return nil, systemError{err}
}
return computePrivileges(config), nil
}
// Upgrade upgrades a plugin
func (pm *Manager) Upgrade(ctx context.Context, ref reference.Named, name string, metaHeader http.Header, authConfig *types.AuthConfig, privileges types.PluginPrivileges, outStream io.Writer) (err error) {
p, err := pm.config.Store.GetV2Plugin(name)
if err != nil {
return err
}
if p.IsEnabled() {
return errors.Wrap(enabledError(p.Name()), "plugin must be disabled before upgrading")
}
pm.muGC.RLock()
defer pm.muGC.RUnlock()
// revalidate because Pull is public
if _, err := reference.ParseNormalizedNamed(name); err != nil {
return errors.Wrapf(validationError{err}, "failed to parse %q", name)
}
tmpRootFSDir, err := ioutil.TempDir(pm.tmpDir(), ".rootfs")
if err != nil {
return errors.Wrap(systemError{err}, "error preparing upgrade")
}
defer os.RemoveAll(tmpRootFSDir)
dm := &downloadManager{
tmpDir: tmpRootFSDir,
blobStore: pm.blobStore,
}
pluginPullConfig := &distribution.ImagePullConfig{
Config: distribution.Config{
MetaHeaders: metaHeader,
AuthConfig: authConfig,
RegistryService: pm.config.RegistryService,
ImageEventLogger: pm.config.LogPluginEvent,
ImageStore: dm,
},
DownloadManager: dm, // todo: reevaluate if possible to substitute distribution/xfer dependencies instead
Schema2Types: distribution.PluginTypes,
}
err = pm.pull(ctx, ref, pluginPullConfig, outStream)
if err != nil {
go pm.GC()
return err
}
if err := pm.upgradePlugin(p, dm.configDigest, dm.blobs, tmpRootFSDir, &privileges); err != nil {
return err
}
p.PluginObj.PluginReference = ref.String()
return nil
}
// Pull pulls a plugin, check if the correct privileges are provided and install the plugin.
func (pm *Manager) Pull(ctx context.Context, ref reference.Named, name string, metaHeader http.Header, authConfig *types.AuthConfig, privileges types.PluginPrivileges, outStream io.Writer, opts ...CreateOpt) (err error) {
pm.muGC.RLock()
defer pm.muGC.RUnlock()
// revalidate because Pull is public
nameref, err := reference.ParseNormalizedNamed(name)
if err != nil {
return errors.Wrapf(validationError{err}, "failed to parse %q", name)
}
name = reference.FamiliarString(reference.TagNameOnly(nameref))
if err := pm.config.Store.validateName(name); err != nil {
return validationError{err}
}
tmpRootFSDir, err := ioutil.TempDir(pm.tmpDir(), ".rootfs")
if err != nil {
return errors.Wrap(systemError{err}, "error preparing pull")
}
defer os.RemoveAll(tmpRootFSDir)
dm := &downloadManager{
tmpDir: tmpRootFSDir,
blobStore: pm.blobStore,
}
pluginPullConfig := &distribution.ImagePullConfig{
Config: distribution.Config{
MetaHeaders: metaHeader,
AuthConfig: authConfig,
RegistryService: pm.config.RegistryService,
ImageEventLogger: pm.config.LogPluginEvent,
ImageStore: dm,
},
DownloadManager: dm, // todo: reevaluate if possible to substitute distribution/xfer dependencies instead
Schema2Types: distribution.PluginTypes,
}
err = pm.pull(ctx, ref, pluginPullConfig, outStream)
if err != nil {
go pm.GC()
return err
}
refOpt := func(p *v2.Plugin) {
p.PluginObj.PluginReference = ref.String()
}
optsList := make([]CreateOpt, 0, len(opts)+1)
optsList = append(optsList, opts...)
optsList = append(optsList, refOpt)
p, err := pm.createPlugin(name, dm.configDigest, dm.blobs, tmpRootFSDir, &privileges, optsList...)
if err != nil {
return err
}
pm.publisher.Publish(EventCreate{Plugin: p.PluginObj})
return nil
}
// List displays the list of plugins and associated metadata.
func (pm *Manager) List(pluginFilters filters.Args) ([]types.Plugin, error) {
if err := pluginFilters.Validate(acceptedPluginFilterTags); err != nil {
return nil, err
}
enabledOnly := false
disabledOnly := false
if pluginFilters.Contains("enabled") {
if pluginFilters.ExactMatch("enabled", "true") {
enabledOnly = true
} else if pluginFilters.ExactMatch("enabled", "false") {
disabledOnly = true
} else {
return nil, invalidFilter{"enabled", pluginFilters.Get("enabled")}
}
}
plugins := pm.config.Store.GetAll()
out := make([]types.Plugin, 0, len(plugins))
next:
for _, p := range plugins {
if enabledOnly && !p.PluginObj.Enabled {
continue
}
if disabledOnly && p.PluginObj.Enabled {
continue
}
if pluginFilters.Contains("capability") {
for _, f := range p.GetTypes() {
if !pluginFilters.Match("capability", f.Capability) {
continue next
}
}
}
out = append(out, p.PluginObj)
}
return out, nil
}
// Push pushes a plugin to the store.
func (pm *Manager) Push(ctx context.Context, name string, metaHeader http.Header, authConfig *types.AuthConfig, outStream io.Writer) error {
p, err := pm.config.Store.GetV2Plugin(name)
if err != nil {
return err
}
ref, err := reference.ParseNormalizedNamed(p.Name())
if err != nil {
return errors.Wrapf(err, "plugin has invalid name %v for push", p.Name())
}
var po progress.Output
if outStream != nil {
// Include a buffer so that slow client connections don't affect
// transfer performance.
progressChan := make(chan progress.Progress, 100)
writesDone := make(chan struct{})
defer func() {
close(progressChan)
<-writesDone
}()
var cancelFunc context.CancelFunc
ctx, cancelFunc = context.WithCancel(ctx)
go func() {
progressutils.WriteDistributionProgress(cancelFunc, outStream, progressChan)
close(writesDone)
}()
po = progress.ChanOutput(progressChan)
} else {
po = progress.DiscardOutput()
}
// TODO: replace these with manager
is := &pluginConfigStore{
pm: pm,
plugin: p,
}
ls := &pluginLayerProvider{
pm: pm,
plugin: p,
}
rs := &pluginReference{
name: ref,
pluginID: p.Config,
}
uploadManager := xfer.NewLayerUploadManager(3)
imagePushConfig := &distribution.ImagePushConfig{
Config: distribution.Config{
MetaHeaders: metaHeader,
AuthConfig: authConfig,
ProgressOutput: po,
RegistryService: pm.config.RegistryService,
ReferenceStore: rs,
ImageEventLogger: pm.config.LogPluginEvent,
ImageStore: is,
RequireSchema2: true,
},
ConfigMediaType: schema2.MediaTypePluginConfig,
LayerStore: ls,
UploadManager: uploadManager,
}
return distribution.Push(ctx, ref, imagePushConfig)
}
type pluginReference struct {
name reference.Named
pluginID digest.Digest
}
func (r *pluginReference) References(id digest.Digest) []reference.Named {
if r.pluginID != id {
return nil
}
return []reference.Named{r.name}
}
func (r *pluginReference) ReferencesByName(ref reference.Named) []refstore.Association {
return []refstore.Association{
{
Ref: r.name,
ID: r.pluginID,
},
}
}
func (r *pluginReference) Get(ref reference.Named) (digest.Digest, error) {
if r.name.String() != ref.String() {
return digest.Digest(""), refstore.ErrDoesNotExist
}
return r.pluginID, nil
}
func (r *pluginReference) AddTag(ref reference.Named, id digest.Digest, force bool) error {
// Read only, ignore
return nil
}
func (r *pluginReference) AddDigest(ref reference.Canonical, id digest.Digest, force bool) error {
// Read only, ignore
return nil
}
func (r *pluginReference) Delete(ref reference.Named) (bool, error) {
// Read only, ignore
return false, nil
}
type pluginConfigStore struct {
pm *Manager
plugin *v2.Plugin
}
func (s *pluginConfigStore) Put([]byte) (digest.Digest, error) {
return digest.Digest(""), errors.New("cannot store config on push")
}
func (s *pluginConfigStore) Get(d digest.Digest) ([]byte, error) {
if s.plugin.Config != d {
return nil, errors.New("plugin not found")
}
rwc, err := s.pm.blobStore.Get(d)
if err != nil {
return nil, err
}
defer rwc.Close()
return ioutil.ReadAll(rwc)
}
func (s *pluginConfigStore) RootFSAndOSFromConfig(c []byte) (*image.RootFS, layer.OS, error) {
return configToRootFS(c)
}
type pluginLayerProvider struct {
pm *Manager
plugin *v2.Plugin
}
func (p *pluginLayerProvider) Get(id layer.ChainID) (distribution.PushLayer, error) {
rootFS := rootFSFromPlugin(p.plugin.PluginObj.Config.Rootfs)
var i int
for i = 1; i <= len(rootFS.DiffIDs); i++ {
if layer.CreateChainID(rootFS.DiffIDs[:i]) == id {
break
}
}
if i > len(rootFS.DiffIDs) {
return nil, errors.New("layer not found")
}
return &pluginLayer{
pm: p.pm,
diffIDs: rootFS.DiffIDs[:i],
blobs: p.plugin.Blobsums[:i],
}, nil
}
type pluginLayer struct {
pm *Manager
diffIDs []layer.DiffID
blobs []digest.Digest
}
func (l *pluginLayer) ChainID() layer.ChainID {
return layer.CreateChainID(l.diffIDs)
}
func (l *pluginLayer) DiffID() layer.DiffID {
return l.diffIDs[len(l.diffIDs)-1]
}
func (l *pluginLayer) Parent() distribution.PushLayer {
if len(l.diffIDs) == 1 {
return nil
}
return &pluginLayer{
pm: l.pm,
diffIDs: l.diffIDs[:len(l.diffIDs)-1],
blobs: l.blobs[:len(l.diffIDs)-1],
}
}
func (l *pluginLayer) Open() (io.ReadCloser, error) {
return l.pm.blobStore.Get(l.blobs[len(l.diffIDs)-1])
}
func (l *pluginLayer) Size() (int64, error) {
return l.pm.blobStore.Size(l.blobs[len(l.diffIDs)-1])
}
func (l *pluginLayer) MediaType() string {
return schema2.MediaTypeLayer
}
func (l *pluginLayer) Release() {
// Nothing needs to be release, no references held
}
// Remove deletes plugin's root directory.
func (pm *Manager) Remove(name string, config *types.PluginRmConfig) error {
p, err := pm.config.Store.GetV2Plugin(name)
pm.mu.RLock()
c := pm.cMap[p]
pm.mu.RUnlock()
if err != nil {
return err
}
if !config.ForceRemove {
if p.GetRefCount() > 0 {
return inUseError(p.Name())
}
if p.IsEnabled() {
return enabledError(p.Name())
}
}
if p.IsEnabled() {
if err := pm.disable(p, c); err != nil {
logrus.Errorf("failed to disable plugin '%s': %s", p.Name(), err)
}
}
defer func() {
go pm.GC()
}()
id := p.GetID()
pluginDir := filepath.Join(pm.config.Root, id)
if err := mount.RecursiveUnmount(pluginDir); err != nil {
return errors.Wrap(err, "error unmounting plugin data")
}
removeDir := pluginDir + "-removing"
if err := os.Rename(pluginDir, removeDir); err != nil {
return errors.Wrap(err, "error performing atomic remove of plugin dir")
}
if err := system.EnsureRemoveAll(removeDir); err != nil {
return errors.Wrap(err, "error removing plugin dir")
}
pm.config.Store.Remove(p)
pm.config.LogPluginEvent(id, name, "remove")
pm.publisher.Publish(EventRemove{Plugin: p.PluginObj})
return nil
}
// Set sets plugin args
func (pm *Manager) Set(name string, args []string) error {
p, err := pm.config.Store.GetV2Plugin(name)
if err != nil {
return err
}
if err := p.Set(args); err != nil {
return err
}
return pm.save(p)
}
// CreateFromContext creates a plugin from the given pluginDir which contains
// both the rootfs and the config.json and a repoName with optional tag.
func (pm *Manager) CreateFromContext(ctx context.Context, tarCtx io.ReadCloser, options *types.PluginCreateOptions) (err error) {
pm.muGC.RLock()
defer pm.muGC.RUnlock()
ref, err := reference.ParseNormalizedNamed(options.RepoName)
if err != nil {
return errors.Wrapf(err, "failed to parse reference %v", options.RepoName)
}
if _, ok := ref.(reference.Canonical); ok {
return errors.Errorf("canonical references are not permitted")
}
name := reference.FamiliarString(reference.TagNameOnly(ref))
if err := pm.config.Store.validateName(name); err != nil { // fast check, real check is in createPlugin()
return err
}
tmpRootFSDir, err := ioutil.TempDir(pm.tmpDir(), ".rootfs")
if err != nil {
return errors.Wrap(err, "failed to create temp directory")
}
defer os.RemoveAll(tmpRootFSDir)
var configJSON []byte
rootFS := splitConfigRootFSFromTar(tarCtx, &configJSON)
rootFSBlob, err := pm.blobStore.New()
if err != nil {
return err
}
defer rootFSBlob.Close()
gzw := gzip.NewWriter(rootFSBlob)
layerDigester := digest.Canonical.Digester()
rootFSReader := io.TeeReader(rootFS, io.MultiWriter(gzw, layerDigester.Hash()))
if err := chrootarchive.Untar(rootFSReader, tmpRootFSDir, nil); err != nil {
return err
}
if err := rootFS.Close(); err != nil {
return err
}
if configJSON == nil {
return errors.New("config not found")
}
if err := gzw.Close(); err != nil {
return errors.Wrap(err, "error closing gzip writer")
}
var config types.PluginConfig
if err := json.Unmarshal(configJSON, &config); err != nil {
return errors.Wrap(err, "failed to parse config")
}
if err := pm.validateConfig(config); err != nil {
return err
}
pm.mu.Lock()
defer pm.mu.Unlock()
rootFSBlobsum, err := rootFSBlob.Commit()
if err != nil {
return err
}
defer func() {
if err != nil {
go pm.GC()
}
}()
config.Rootfs = &types.PluginConfigRootfs{
Type: "layers",
DiffIds: []string{layerDigester.Digest().String()},
}
config.DockerVersion = dockerversion.Version
configBlob, err := pm.blobStore.New()
if err != nil {
return err
}
defer configBlob.Close()
if err := json.NewEncoder(configBlob).Encode(config); err != nil {
return errors.Wrap(err, "error encoding json config")
}
configBlobsum, err := configBlob.Commit()
if err != nil {
return err
}
p, err := pm.createPlugin(name, configBlobsum, []digest.Digest{rootFSBlobsum}, tmpRootFSDir, nil)
if err != nil {
return err
}
p.PluginObj.PluginReference = name
pm.publisher.Publish(EventCreate{Plugin: p.PluginObj})
pm.config.LogPluginEvent(p.PluginObj.ID, name, "create")
return nil
}
func (pm *Manager) validateConfig(config types.PluginConfig) error {
return nil // TODO:
}
func splitConfigRootFSFromTar(in io.ReadCloser, config *[]byte) io.ReadCloser {
pr, pw := io.Pipe()
go func() {
tarReader := tar.NewReader(in)
tarWriter := tar.NewWriter(pw)
defer in.Close()
hasRootFS := false
for {
hdr, err := tarReader.Next()
if err == io.EOF {
if !hasRootFS {
pw.CloseWithError(errors.Wrap(err, "no rootfs found"))
return
}
// Signals end of archive.
tarWriter.Close()
pw.Close()
return
}
if err != nil {
pw.CloseWithError(errors.Wrap(err, "failed to read from tar"))
return
}
content := io.Reader(tarReader)
name := path.Clean(hdr.Name)
if path.IsAbs(name) {
name = name[1:]
}
if name == configFileName {
dt, err := ioutil.ReadAll(content)
if err != nil {
pw.CloseWithError(errors.Wrapf(err, "failed to read %s", configFileName))
return
}
*config = dt
}
if parts := strings.Split(name, "/"); len(parts) != 0 && parts[0] == rootFSFileName {
hdr.Name = path.Clean(path.Join(parts[1:]...))
if hdr.Typeflag == tar.TypeLink && strings.HasPrefix(strings.ToLower(hdr.Linkname), rootFSFileName+"/") {
hdr.Linkname = hdr.Linkname[len(rootFSFileName)+1:]
}
if err := tarWriter.WriteHeader(hdr); err != nil {
pw.CloseWithError(errors.Wrap(err, "error writing tar header"))
return
}
if _, err := pools.Copy(tarWriter, content); err != nil {
pw.CloseWithError(errors.Wrap(err, "error copying tar data"))
return
}
hasRootFS = true
} else {
io.Copy(ioutil.Discard, content)
}
}
}()
return pr
}