132 lines
2.9 KiB
Go
132 lines
2.9 KiB
Go
package plugins
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import (
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"encoding/json"
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"errors"
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"fmt"
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"io/ioutil"
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"net/url"
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"os"
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"path/filepath"
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"strings"
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"sync"
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)
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var (
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// ErrNotFound plugin not found
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ErrNotFound = errors.New("plugin not found")
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socketsPath = "/run/oci-storage/plugins"
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specsPaths = []string{"/etc/oci-storage/plugins", "/usr/lib/oci-storage/plugins"}
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)
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// localRegistry defines a registry that is local (using unix socket).
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type localRegistry struct{}
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func newLocalRegistry() localRegistry {
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return localRegistry{}
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}
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// Scan scans all the plugin paths and returns all the names it found
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func Scan() ([]string, error) {
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var names []string
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if err := filepath.Walk(socketsPath, func(path string, fi os.FileInfo, err error) error {
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if err != nil {
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return nil
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}
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if fi.Mode()&os.ModeSocket != 0 {
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name := strings.TrimSuffix(fi.Name(), filepath.Ext(fi.Name()))
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names = append(names, name)
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}
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return nil
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}); err != nil {
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return nil, err
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}
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for _, path := range specsPaths {
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if err := filepath.Walk(path, func(p string, fi os.FileInfo, err error) error {
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if err != nil || fi.IsDir() {
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return nil
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}
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name := strings.TrimSuffix(fi.Name(), filepath.Ext(fi.Name()))
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names = append(names, name)
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return nil
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}); err != nil {
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return nil, err
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}
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}
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return names, nil
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}
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// Plugin returns the plugin registered with the given name (or returns an error).
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func (l *localRegistry) Plugin(name string) (*Plugin, error) {
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socketpaths := pluginPaths(socketsPath, name, ".sock")
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for _, p := range socketpaths {
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if fi, err := os.Stat(p); err == nil && fi.Mode()&os.ModeSocket != 0 {
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return NewLocalPlugin(name, "unix://"+p), nil
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}
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}
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var txtspecpaths []string
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for _, p := range specsPaths {
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txtspecpaths = append(txtspecpaths, pluginPaths(p, name, ".spec")...)
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txtspecpaths = append(txtspecpaths, pluginPaths(p, name, ".json")...)
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}
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for _, p := range txtspecpaths {
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if _, err := os.Stat(p); err == nil {
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if strings.HasSuffix(p, ".json") {
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return readPluginJSONInfo(name, p)
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}
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return readPluginInfo(name, p)
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}
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}
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return nil, ErrNotFound
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}
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func readPluginInfo(name, path string) (*Plugin, error) {
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content, err := ioutil.ReadFile(path)
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if err != nil {
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return nil, err
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}
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addr := strings.TrimSpace(string(content))
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u, err := url.Parse(addr)
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if err != nil {
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return nil, err
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}
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if len(u.Scheme) == 0 {
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return nil, fmt.Errorf("Unknown protocol")
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}
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return NewLocalPlugin(name, addr), nil
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}
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func readPluginJSONInfo(name, path string) (*Plugin, error) {
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f, err := os.Open(path)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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var p Plugin
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if err := json.NewDecoder(f).Decode(&p); err != nil {
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return nil, err
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}
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p.name = name
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if len(p.TLSConfig.CAFile) == 0 {
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p.TLSConfig.InsecureSkipVerify = true
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}
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p.activateWait = sync.NewCond(&sync.Mutex{})
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return &p, nil
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}
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func pluginPaths(base, name, ext string) []string {
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return []string{
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filepath.Join(base, name+ext),
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filepath.Join(base, name, name+ext),
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}
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}
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