daemon/info: don't sort authorization plugins as order matters

plugins exist in a chain that composes potentially mutating requests and
responses. This simply reverts the sorting of AuthZ plugins so that the
/info API endpoint returns the internal ordering used for AuthZ composition.

Volume driver plugins are not affected because they are just a set.

Signed-off-by: David Sheets <dsheets@docker.com>

daemon/config/config.go

@@ -9,7 +9,6 @@ import (
 	"io/ioutil"
 	"reflect"
 	"runtime"
-	"sort"
 	"strings"
 	"sync"
 
@@ -503,19 +502,6 @@ func Validate(config *Config) error {
 	return nil
 }
 
-// GetAuthorizationPlugins returns daemon's sorted authorization plugins
-func (conf *Config) GetAuthorizationPlugins() []string {
-	conf.Lock()
-	defer conf.Unlock()
-
-	authPlugins := make([]string, 0, len(conf.AuthorizationPlugins))
-	for _, p := range conf.AuthorizationPlugins {
-		authPlugins = append(authPlugins, p)
-	}
-	sort.Strings(authPlugins)
-	return authPlugins
-}
-
 // ModifiedDiscoverySettings returns whether the discovery configuration has been modified or not.
 func ModifiedDiscoverySettings(config *Config, backendType, advertise string, clusterOpts map[string]string) bool {
 	if config.ClusterStore != backendType || config.ClusterAdvertise != advertise {

daemon/info.go

@@ -175,7 +175,9 @@ func (daemon *Daemon) showPluginsInfo() types.PluginsInfo {
 
 	pluginsInfo.Volume = volumedrivers.GetDriverList()
 	pluginsInfo.Network = daemon.GetNetworkDriverList()
-	pluginsInfo.Authorization = daemon.configStore.GetAuthorizationPlugins()
+	// The authorization plugins are returned in the order they are
+	// used as they constitute a request/response modification chain.
+	pluginsInfo.Authorization = daemon.configStore.AuthorizationPlugins
 	pluginsInfo.Log = logger.ListDrivers()
 
 	return pluginsInfo