Link hidden docker socket to the expected path

daemon/daemon.go

@@ -4,6 +4,14 @@ import (
 	"fmt"
 	"os/exec"
 	"time"
+
+	"github.com/pkg/errors"
+	"os"
+)
+
+const (
+  StdDockerSocketPath = "/var/run/docker.sock"
+  HiddenDockerSocketPath = "/var/run/hidden_docker.sock"
 )
 
 type Daemon struct {
@@ -26,6 +34,10 @@ type Daemon struct {
 func StartDaemon(d Daemon) error {
 	if !d.Disabled {
 		startDaemon(d)
+	} else if !d.NotHiddenSocket {
+		if err := os.Link(HiddenDockerSocketPath, StdDockerSocketPath); err != nil {
+			return errors.Wrap(err, "failed to link hidden docker socket to common one")
+		}
 	}
 	return waitForDaemon()
 }

plugin.go

@@ -24,9 +24,6 @@ const (
 	secretFile       = "/tmp/action.secrets"
 	workflowFile     = "/tmp/workflow.yml"
 	eventPayloadFile = "/tmp/event.json"
-
-	stdDockerSocketPath = "/var/run/docker.sock"
-	hiddenDockerSocketPath = "/var/run/hidden_docker.sock"
 )
 
 var (
@@ -120,10 +117,6 @@ func (p Plugin) Exec() error {
 	cmd.Stderr = os.Stderr
 	trace(cmd)
 
-	if p.Daemon.Disabled && !p.Daemon.NotHiddenSocket {
-		cmd.Env = append(os.Environ(), fmt.Sprintf("DOCKER_HOST=%s", "unix://" + hiddenDockerSocketPath))
-	}
-
 	err := cmd.Run()
 	if err != nil {
 		return err
@@ -139,15 +132,7 @@ func trace(cmd *exec.Cmd) {
 
 func getWorkDirPath(p Plugin, ctx context.Context) (string, string, error) {
 	// Connect to the docker
-	// Note: We use a custom "hidden" socket path
-	dockerSockPath := ""
-  if p.Daemon.NotHiddenSocket {
-		dockerSockPath = stdDockerSocketPath
-	} else {
-		dockerSockPath = hiddenDockerSocketPath
-	}
-
-	docker, err := docker.NewClient("unix://" + dockerSockPath, "v1.13.1", nil, nil)
+	docker, err := docker.NewClient("unix://" + daemon.StdDockerSocketPath, "v1.13.1", nil, nil)
 	if err != nil {
 		return "", "", errors.Wrap(err, "failed to create docker client")
 	}