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backend_linux.go
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backend_linux.go
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// +build linux
package plugin
import (
"bytes"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"path/filepath"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/api/types"
"github.com/docker/docker/pkg/archive"
"github.com/docker/docker/pkg/chrootarchive"
"github.com/docker/docker/pkg/stringid"
"github.com/docker/docker/plugin/distribution"
"github.com/docker/docker/plugin/v2"
"golang.org/x/net/context"
)
// Disable deactivates a plugin, which implies that they cannot be used by containers.
func (pm *Manager) Disable(name string) error {
p, err := pm.pluginStore.GetByName(name)
if err != nil {
return err
}
if err := pm.disable(p); err != nil {
return err
}
pm.pluginEventLogger(p.GetID(), name, "disable")
return nil
}
// Enable activates a plugin, which implies that they are ready to be used by containers.
func (pm *Manager) Enable(name string, config *types.PluginEnableConfig) error {
p, err := pm.pluginStore.GetByName(name)
if err != nil {
return err
}
p.TimeoutInSecs = config.Timeout
if err := pm.enable(p, false); err != nil {
return err
}
pm.pluginEventLogger(p.GetID(), name, "enable")
return nil
}
// Inspect examines a plugin config
func (pm *Manager) Inspect(name string) (tp types.Plugin, err error) {
p, err := pm.pluginStore.GetByName(name)
if err != nil {
return tp, err
}
return p.PluginObj, nil
}
// Pull pulls a plugin and computes the privileges required to install it.
func (pm *Manager) Pull(name string, metaHeader http.Header, authConfig *types.AuthConfig) (types.PluginPrivileges, error) {
ref, err := distribution.GetRef(name)
if err != nil {
logrus.Debugf("error in distribution.GetRef: %v", err)
return nil, err
}
name = ref.String()
if p, _ := pm.pluginStore.GetByName(name); p != nil {
logrus.Debug("plugin already exists")
return nil, fmt.Errorf("%s exists", name)
}
pluginID := stringid.GenerateNonCryptoID()
if err := os.MkdirAll(filepath.Join(pm.libRoot, pluginID), 0755); err != nil {
logrus.Debugf("error in MkdirAll: %v", err)
return nil, err
}
pd, err := distribution.Pull(ref, pm.registryService, metaHeader, authConfig)
if err != nil {
logrus.Debugf("error in distribution.Pull(): %v", err)
return nil, err
}
if err := distribution.WritePullData(pd, filepath.Join(pm.libRoot, pluginID), true); err != nil {
logrus.Debugf("error in distribution.WritePullData(): %v", err)
return nil, err
}
tag := distribution.GetTag(ref)
p := v2.NewPlugin(ref.Name(), pluginID, pm.runRoot, pm.libRoot, tag)
if err := p.InitPlugin(); err != nil {
return nil, err
}
pm.pluginStore.Add(p)
pm.pluginEventLogger(pluginID, name, "pull")
return p.ComputePrivileges(), nil
}
// List displays the list of plugins and associated metadata.
func (pm *Manager) List() ([]types.Plugin, error) {
plugins := pm.pluginStore.GetAll()
out := make([]types.Plugin, 0, len(plugins))
for _, p := range plugins {
out = append(out, p.PluginObj)
}
return out, nil
}
// Push pushes a plugin to the store.
func (pm *Manager) Push(name string, metaHeader http.Header, authConfig *types.AuthConfig) error {
p, err := pm.pluginStore.GetByName(name)
if err != nil {
return err
}
dest := filepath.Join(pm.libRoot, p.GetID())
config, err := ioutil.ReadFile(filepath.Join(dest, "config.json"))
if err != nil {
return err
}
var dummy types.Plugin
err = json.Unmarshal(config, &dummy)
if err != nil {
return err
}
rootfs, err := archive.Tar(filepath.Join(dest, "rootfs"), archive.Gzip)
if err != nil {
return err
}
defer rootfs.Close()
_, err = distribution.Push(name, pm.registryService, metaHeader, authConfig, ioutil.NopCloser(bytes.NewReader(config)), rootfs)
// XXX: Ignore returning digest for now.
// Since digest needs to be written to the ProgressWriter.
return err
}
// Remove deletes plugin's root directory.
func (pm *Manager) Remove(name string, config *types.PluginRmConfig) error {
p, err := pm.pluginStore.GetByName(name)
if err != nil {
return err
}
if !config.ForceRemove {
p.RLock()
if p.RefCount > 0 {
p.RUnlock()
return fmt.Errorf("plugin %s is in use", p.Name())
}
p.RUnlock()
if p.IsEnabled() {
return fmt.Errorf("plugin %s is enabled", p.Name())
}
}
if p.IsEnabled() {
if err := pm.disable(p); err != nil {
logrus.Errorf("failed to disable plugin '%s': %s", p.Name(), err)
}
}
pm.pluginStore.Remove(p)
os.RemoveAll(filepath.Join(pm.libRoot, p.GetID()))
pm.pluginEventLogger(p.GetID(), name, "remove")
return nil
}
// Set sets plugin args
func (pm *Manager) Set(name string, args []string) error {
p, err := pm.pluginStore.GetByName(name)
if err != nil {
return err
}
return p.Set(args)
}
// 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.Reader, options *types.PluginCreateOptions) error {
pluginID := stringid.GenerateNonCryptoID()
pluginDir := filepath.Join(pm.libRoot, pluginID)
if err := os.MkdirAll(pluginDir, 0755); err != nil {
return err
}
if err := chrootarchive.Untar(tarCtx, pluginDir, nil); err != nil {
return err
}
repoName := options.RepoName
ref, err := distribution.GetRef(repoName)
if err != nil {
return err
}
name := ref.Name()
tag := distribution.GetTag(ref)
p := v2.NewPlugin(name, pluginID, pm.runRoot, pm.libRoot, tag)
if err := p.InitPlugin(); err != nil {
return err
}
pm.pluginStore.Add(p)
pm.pluginEventLogger(p.GetID(), repoName, "create")
return nil
}