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package plugins // import "github.com/docker/docker/pkg/plugins"
import (
"encoding/json"
"fmt"
"io/fs"
"net/url"
"os"
"path/filepath"
"strings"
"sync"
"github.com/containerd/log"
"github.com/moby/sys/userns"
"github.com/pkg/errors"
)
// ErrNotFound plugin not found
var ErrNotFound = errors.New("plugin not found")
const defaultSocketsPath = "/run/docker/plugins"
// LocalRegistry defines a registry that is local (using unix socket).
type LocalRegistry struct {
socketsPath string
specsPaths []string
}
func NewLocalRegistry() LocalRegistry {
return LocalRegistry{
socketsPath: defaultSocketsPath,
specsPaths: specsPaths(),
}
}
// Scan scans all the plugin paths and returns all the names it found
func (l *LocalRegistry) Scan() ([]string, error) {
var names []string
dirEntries, err := os.ReadDir(l.socketsPath)
if err != nil && !os.IsNotExist(err) {
return nil, errors.Wrap(err, "error reading dir entries")
}
for _, entry := range dirEntries {
if entry.IsDir() {
fi, err := os.Stat(filepath.Join(l.socketsPath, entry.Name(), entry.Name()+".sock"))
if err != nil {
continue
}
entry = fs.FileInfoToDirEntry(fi)
}
if entry.Type()&os.ModeSocket != 0 {
names = append(names, strings.TrimSuffix(filepath.Base(entry.Name()), filepath.Ext(entry.Name())))
}
}
for _, p := range l.specsPaths {
dirEntries, err = os.ReadDir(p)
if err != nil {
if os.IsNotExist(err) {
continue
}
if os.IsPermission(err) && userns.RunningInUserNS() {
log.L.Debug(err.Error())
continue
}
return nil, errors.Wrap(err, "error reading dir entries")
}
for _, entry := range dirEntries {
if entry.IsDir() {
infos, err := os.ReadDir(filepath.Join(p, entry.Name()))
if err != nil {
continue
}
for _, info := range infos {
if strings.TrimSuffix(info.Name(), filepath.Ext(info.Name())) == entry.Name() {
entry = info
break
}
}
}
switch ext := filepath.Ext(entry.Name()); ext {
case ".spec", ".json":
plugin := strings.TrimSuffix(entry.Name(), ext)
names = append(names, plugin)
default:
}
}
}
return names, nil
}
// Plugin returns the plugin registered with the given name (or returns an error).
func (l *LocalRegistry) Plugin(name string) (*Plugin, error) {
socketPaths := pluginPaths(l.socketsPath, name, ".sock")
for _, p := range socketPaths {
if fi, err := os.Stat(p); err == nil && fi.Mode()&os.ModeSocket != 0 {
return NewLocalPlugin(name, "unix://"+p), nil
}
}
var txtSpecPaths []string
for _, p := range l.specsPaths {
txtSpecPaths = append(txtSpecPaths, pluginPaths(p, name, ".spec")...)
txtSpecPaths = append(txtSpecPaths, pluginPaths(p, name, ".json")...)
}
for _, p := range txtSpecPaths {
if _, err := os.Stat(p); err == nil {
if strings.HasSuffix(p, ".json") {
return readPluginJSONInfo(name, p)
}
return readPluginInfo(name, p)
}
}
return nil, errors.Wrapf(ErrNotFound, "could not find plugin %s in v1 plugin registry", name)
}
// SpecsPaths returns paths in which to look for plugins, in order of priority.
//
// On Windows:
//
// - "%programdata%\docker\plugins"
//
// On Unix in non-rootless mode:
//
// - "/etc/docker/plugins"
// - "/usr/lib/docker/plugins"
//
// On Unix in rootless-mode:
//
// - "$XDG_CONFIG_HOME/docker/plugins" (or "/etc/docker/plugins" if $XDG_CONFIG_HOME is not set)
// - "$HOME/.local/lib/docker/plugins" (pr "/usr/lib/docker/plugins" if $HOME is set)
func SpecsPaths() []string {
return specsPaths()
}
func readPluginInfo(name, path string) (*Plugin, error) {
content, err := os.ReadFile(path)
if err != nil {
return nil, err
}
addr := strings.TrimSpace(string(content))
u, err := url.Parse(addr)
if err != nil {
return nil, err
}
if len(u.Scheme) == 0 {
return nil, fmt.Errorf("Unknown protocol")
}
return NewLocalPlugin(name, addr), nil
}
func readPluginJSONInfo(name, path string) (*Plugin, error) {
f, err := os.Open(path)
if err != nil {
return nil, err
}
defer f.Close()
var p Plugin
if err := json.NewDecoder(f).Decode(&p); err != nil {
return nil, err
}
p.name = name
if p.TLSConfig != nil && len(p.TLSConfig.CAFile) == 0 {
p.TLSConfig.InsecureSkipVerify = true
}
p.activateWait = sync.NewCond(&sync.Mutex{})
return &p, nil
}
func pluginPaths(base, name, ext string) []string {
return []string{
filepath.Join(base, name+ext),
filepath.Join(base, name, name+ext),
}
}
|
