mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
387 lines
9.9 KiB
Go
387 lines
9.9 KiB
Go
// +build linux
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package plugin
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"os"
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"path/filepath"
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"reflect"
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"regexp"
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"github.com/Sirupsen/logrus"
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"github.com/docker/docker/api/types"
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"github.com/docker/docker/pkg/archive"
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"github.com/docker/docker/pkg/chrootarchive"
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"github.com/docker/docker/pkg/stringid"
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"github.com/docker/docker/plugin/distribution"
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"github.com/docker/docker/plugin/v2"
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"github.com/docker/docker/reference"
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"github.com/pkg/errors"
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"golang.org/x/net/context"
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)
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var (
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validFullID = regexp.MustCompile(`^([a-f0-9]{64})$`)
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validPartialID = regexp.MustCompile(`^([a-f0-9]{1,64})$`)
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)
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// Disable deactivates a plugin, which implies that they cannot be used by containers.
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func (pm *Manager) Disable(name string) error {
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p, err := pm.pluginStore.GetByName(name)
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if err != nil {
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return err
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}
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pm.mu.RLock()
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c := pm.cMap[p]
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pm.mu.RUnlock()
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if err := pm.disable(p, c); err != nil {
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return err
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}
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pm.pluginEventLogger(p.GetID(), name, "disable")
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return nil
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}
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// Enable activates a plugin, which implies that they are ready to be used by containers.
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func (pm *Manager) Enable(name string, config *types.PluginEnableConfig) error {
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p, err := pm.pluginStore.GetByName(name)
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if err != nil {
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return err
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}
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c := &controller{timeoutInSecs: config.Timeout}
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if err := pm.enable(p, c, false); err != nil {
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return err
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}
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pm.pluginEventLogger(p.GetID(), name, "enable")
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return nil
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}
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// Inspect examines a plugin config
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func (pm *Manager) Inspect(refOrID string) (tp types.Plugin, err error) {
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// Match on full ID
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if validFullID.MatchString(refOrID) {
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p, err := pm.pluginStore.GetByID(refOrID)
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if err == nil {
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return p.PluginObj, nil
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}
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}
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// Match on full name
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if pluginName, err := getPluginName(refOrID); err == nil {
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if p, err := pm.pluginStore.GetByName(pluginName); err == nil {
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return p.PluginObj, nil
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}
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}
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// Match on partial ID
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if validPartialID.MatchString(refOrID) {
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p, err := pm.pluginStore.Search(refOrID)
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if err == nil {
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return p.PluginObj, nil
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}
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return tp, err
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}
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return tp, fmt.Errorf("no such plugin name or ID associated with %q", refOrID)
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}
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func (pm *Manager) pull(name string, metaHeader http.Header, authConfig *types.AuthConfig) (reference.Named, distribution.PullData, error) {
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ref, err := distribution.GetRef(name)
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if err != nil {
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logrus.Debugf("error in distribution.GetRef: %v", err)
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return nil, nil, err
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}
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name = ref.String()
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if p, _ := pm.pluginStore.GetByName(name); p != nil {
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logrus.Debug("plugin already exists")
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return nil, nil, fmt.Errorf("%s exists", name)
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}
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pd, err := distribution.Pull(ref, pm.registryService, metaHeader, authConfig)
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if err != nil {
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logrus.Debugf("error in distribution.Pull(): %v", err)
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return nil, nil, err
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}
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return ref, pd, nil
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}
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func computePrivileges(pd distribution.PullData) (types.PluginPrivileges, error) {
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config, err := pd.Config()
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if err != nil {
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return nil, err
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}
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var c types.PluginConfig
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if err := json.Unmarshal(config, &c); err != nil {
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return nil, err
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}
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var privileges types.PluginPrivileges
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if c.Network.Type != "null" && c.Network.Type != "bridge" && c.Network.Type != "" {
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privileges = append(privileges, types.PluginPrivilege{
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Name: "network",
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Description: "permissions to access a network",
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Value: []string{c.Network.Type},
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})
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}
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for _, mount := range c.Mounts {
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if mount.Source != nil {
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privileges = append(privileges, types.PluginPrivilege{
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Name: "mount",
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Description: "host path to mount",
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Value: []string{*mount.Source},
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})
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}
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}
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for _, device := range c.Linux.Devices {
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if device.Path != nil {
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privileges = append(privileges, types.PluginPrivilege{
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Name: "device",
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Description: "host device to access",
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Value: []string{*device.Path},
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})
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}
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}
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if c.Linux.DeviceCreation {
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privileges = append(privileges, types.PluginPrivilege{
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Name: "device-creation",
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Description: "allow creating devices inside plugin",
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Value: []string{"true"},
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})
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}
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if len(c.Linux.Capabilities) > 0 {
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privileges = append(privileges, types.PluginPrivilege{
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Name: "capabilities",
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Description: "list of additional capabilities required",
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Value: c.Linux.Capabilities,
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})
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}
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return privileges, nil
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}
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// Privileges pulls a plugin config and computes the privileges required to install it.
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func (pm *Manager) Privileges(name string, metaHeader http.Header, authConfig *types.AuthConfig) (types.PluginPrivileges, error) {
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_, pd, err := pm.pull(name, metaHeader, authConfig)
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if err != nil {
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return nil, err
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}
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return computePrivileges(pd)
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}
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// Pull pulls a plugin, check if the correct privileges are provided and install the plugin.
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func (pm *Manager) Pull(name string, metaHeader http.Header, authConfig *types.AuthConfig, privileges types.PluginPrivileges) (err error) {
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ref, pd, err := pm.pull(name, metaHeader, authConfig)
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if err != nil {
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return err
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}
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requiredPrivileges, err := computePrivileges(pd)
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if err != nil {
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return err
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}
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if !reflect.DeepEqual(privileges, requiredPrivileges) {
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return errors.New("incorrect privileges")
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}
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pluginID := stringid.GenerateNonCryptoID()
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pluginDir := filepath.Join(pm.libRoot, pluginID)
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if err := os.MkdirAll(pluginDir, 0755); err != nil {
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logrus.Debugf("error in MkdirAll: %v", err)
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return err
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}
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defer func() {
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if err != nil {
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if delErr := os.RemoveAll(pluginDir); delErr != nil {
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logrus.Warnf("unable to remove %q from failed plugin pull: %v", pluginDir, delErr)
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}
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}
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}()
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err = distribution.WritePullData(pd, filepath.Join(pm.libRoot, pluginID), true)
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if err != nil {
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logrus.Debugf("error in distribution.WritePullData(): %v", err)
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return err
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}
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tag := distribution.GetTag(ref)
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p := v2.NewPlugin(ref.Name(), pluginID, pm.runRoot, pm.libRoot, tag)
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err = p.InitPlugin()
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if err != nil {
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return err
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}
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pm.pluginStore.Add(p)
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pm.pluginEventLogger(pluginID, ref.String(), "pull")
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return nil
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}
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// List displays the list of plugins and associated metadata.
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func (pm *Manager) List() ([]types.Plugin, error) {
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plugins := pm.pluginStore.GetAll()
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out := make([]types.Plugin, 0, len(plugins))
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for _, p := range plugins {
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out = append(out, p.PluginObj)
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}
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return out, nil
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}
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// Push pushes a plugin to the store.
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func (pm *Manager) Push(name string, metaHeader http.Header, authConfig *types.AuthConfig) error {
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p, err := pm.pluginStore.GetByName(name)
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if err != nil {
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return err
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}
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dest := filepath.Join(pm.libRoot, p.GetID())
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config, err := ioutil.ReadFile(filepath.Join(dest, "config.json"))
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if err != nil {
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return err
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}
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var dummy types.Plugin
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err = json.Unmarshal(config, &dummy)
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if err != nil {
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return err
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}
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rootfs, err := archive.Tar(p.Rootfs, archive.Gzip)
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if err != nil {
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return err
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}
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defer rootfs.Close()
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_, err = distribution.Push(name, pm.registryService, metaHeader, authConfig, ioutil.NopCloser(bytes.NewReader(config)), rootfs)
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// XXX: Ignore returning digest for now.
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// Since digest needs to be written to the ProgressWriter.
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return err
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}
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// Remove deletes plugin's root directory.
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func (pm *Manager) Remove(name string, config *types.PluginRmConfig) (err error) {
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p, err := pm.pluginStore.GetByName(name)
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pm.mu.RLock()
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c := pm.cMap[p]
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pm.mu.RUnlock()
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if err != nil {
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return err
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}
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if !config.ForceRemove {
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if p.GetRefCount() > 0 {
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return fmt.Errorf("plugin %s is in use", p.Name())
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}
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if p.IsEnabled() {
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return fmt.Errorf("plugin %s is enabled", p.Name())
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}
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}
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if p.IsEnabled() {
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if err := pm.disable(p, c); err != nil {
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logrus.Errorf("failed to disable plugin '%s': %s", p.Name(), err)
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}
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}
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id := p.GetID()
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pluginDir := filepath.Join(pm.libRoot, id)
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defer func() {
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if err == nil || config.ForceRemove {
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pm.pluginStore.Remove(p)
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pm.pluginEventLogger(id, name, "remove")
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}
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}()
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if err = os.RemoveAll(pluginDir); err != nil {
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return errors.Wrap(err, "failed to remove plugin directory")
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}
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return nil
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}
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// Set sets plugin args
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func (pm *Manager) Set(name string, args []string) error {
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p, err := pm.pluginStore.GetByName(name)
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if err != nil {
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return err
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}
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return p.Set(args)
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}
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// CreateFromContext creates a plugin from the given pluginDir which contains
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// both the rootfs and the config.json and a repoName with optional tag.
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func (pm *Manager) CreateFromContext(ctx context.Context, tarCtx io.Reader, options *types.PluginCreateOptions) error {
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repoName := options.RepoName
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ref, err := distribution.GetRef(repoName)
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if err != nil {
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return err
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}
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name := ref.Name()
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tag := distribution.GetTag(ref)
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pluginID := stringid.GenerateNonCryptoID()
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p := v2.NewPlugin(name, pluginID, pm.runRoot, pm.libRoot, tag)
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if v, _ := pm.pluginStore.GetByName(p.Name()); v != nil {
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return fmt.Errorf("plugin %q already exists", p.Name())
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}
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pluginDir := filepath.Join(pm.libRoot, pluginID)
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if err := os.MkdirAll(pluginDir, 0755); err != nil {
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return err
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}
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// In case an error happens, remove the created directory.
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if err := pm.createFromContext(ctx, tarCtx, pluginDir, repoName, p); err != nil {
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if err := os.RemoveAll(pluginDir); err != nil {
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logrus.Warnf("unable to remove %q from failed plugin creation: %v", pluginDir, err)
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}
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return err
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}
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return nil
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}
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func (pm *Manager) createFromContext(ctx context.Context, tarCtx io.Reader, pluginDir, repoName string, p *v2.Plugin) error {
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if err := chrootarchive.Untar(tarCtx, pluginDir, nil); err != nil {
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return err
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}
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if err := p.InitPlugin(); err != nil {
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return err
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}
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if err := pm.pluginStore.Add(p); err != nil {
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return err
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}
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pm.pluginEventLogger(p.GetID(), repoName, "create")
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return nil
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}
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func getPluginName(name string) (string, error) {
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named, err := reference.ParseNamed(name) // FIXME: validate
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if err != nil {
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return "", err
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}
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if reference.IsNameOnly(named) {
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named = reference.WithDefaultTag(named)
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}
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ref, ok := named.(reference.NamedTagged)
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if !ok {
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return "", fmt.Errorf("invalid name: %s", named.String())
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}
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return ref.String(), nil
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}
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