ignore enroll cmd failing to restart daemon if running on a container

internal/pkg/agent/cmd/container.go

@@ -318,6 +318,10 @@ func runContainerCmd(streams *cli.IOStreams, cfg setupConfig) error {
 		}
 		err = enroll.Wait()
 		if err != nil {
+			if errors.Is(err, &ErrDaemonReload{}) {
+				// there is no daemon to be reloaded on a container.
+				return nil
+			}
 			return errors.New("enrollment failed", err)
 		}
 	}

internal/pkg/agent/cmd/enroll_cmd.go

@@ -116,6 +116,23 @@ type enrollCmdOption struct {
 	Tags                 []string                   `yaml:"omitempty"`
 }
 
+type ErrDaemonReload struct {
+	err error
+}
+
+func (e *ErrDaemonReload) Error() string {
+	return e.err.Error()
+}
+
+func (e *ErrDaemonReload) Unwrap() error {
+	return e.err
+}
+
+func (e *ErrDaemonReload) Is(err error) bool {
+	var errDaemonReload *ErrDaemonReload
+	return errors.As(err, &errDaemonReload)
+}
+
 // remoteConfig returns the configuration used to connect the agent to a fleet process.
 func (e *enrollCmdOption) remoteConfig() (remote.Config, error) {
 	cfg, err := remote.NewConfigFromURL(e.URL)
@@ -463,9 +480,15 @@ func (c *enrollCmd) daemonReloadWithBackoff(ctx context.Context) error {
 	return err
 }
 
-func (c *enrollCmd) daemonReload(ctx context.Context) error {
+func (c *enrollCmd) daemonReload(ctx context.Context) (err error) {
+	defer func() {
+		if err != nil {
+			err = &ErrDaemonReload{err: err}
+		}
+	}()
+
 	daemon := client.New()
-	err := daemon.Connect(ctx)
+	err = daemon.Connect(ctx)
 	if err != nil {
 		return err
 	}

internal/pkg/agent/cmd/enroll_cmd_test.go

@@ -8,6 +8,7 @@ import (
 	"bytes"
 	"context"
 	"crypto/tls"
+	"fmt"
 	"io"
 	"io/ioutil"
 	"net"
@@ -416,6 +417,13 @@ func TestValidateEnrollFlags(t *testing.T) {
 	})
 }
 
+func TestErrDaemonReload(t *testing.T) {
+	err := fmt.Errorf("some wrapping: %w",
+		&ErrDaemonReload{err: errors.New("some error")})
+
+	assert.True(t, errors.Is(err, &ErrDaemonReload{}))
+}
+
 func withServer(
 	m func(t *testing.T) *http.ServeMux,
 	test func(t *testing.T, host string),