Enable plugins on macos

plugin/loader/load_capable.go

+// +build !noplugin
+
+package loader
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"plugin"
+
+	iplugin "github.com/ipfs/go-ipfs/plugin"
+)
+
+func init() {
+	loadPluginsFunc = linuxLoadFunc
+}
+
+func linuxLoadFunc(pluginDir string) ([]iplugin.Plugin, error) {
+	var plugins []iplugin.Plugin
+
+	err := filepath.Walk(pluginDir, func(fi string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		if info.IsDir() {
+			if fi != pluginDir {
+				log.Warningf("found directory inside plugins directory: %s", fi)
+			}
+			return nil
+		}
+
+		if info.Mode().Perm()&0111 == 0 {
+			// file is not executable let's not load it
+			// this is to prevent loading plugins from for example non-executable
+			// mounts, some /tmp mounts are marked as such for security
+			log.Errorf("non-executable file in plugins directory: %s", fi)
+			return nil
+		}
+
+		if newPlugins, err := loadPlugin(fi); err == nil {
+			plugins = append(plugins, newPlugins...)
+		} else {
+			return fmt.Errorf("loading plugin %s: %s", fi, err)
+		}
+		return nil
+	})
+
+	return plugins, err
+}
+
+func loadPlugin(fi string) ([]iplugin.Plugin, error) {
+	pl, err := plugin.Open(fi)
+	if err != nil {
+		return nil, err
+	}
+	pls, err := pl.Lookup("Plugins")
+	if err != nil {
+		return nil, err
+	}
+
+	typePls, ok := pls.(*[]iplugin.Plugin)
+	if !ok {
+		return nil, errors.New("filed 'Plugins' didn't contain correct type")
+	}
+
+	return *typePls, nil
+}