support changing labels

internal/app/cmd/daemon.go

@@ -40,6 +40,14 @@ func runDaemon(ctx context.Context, configFile *string) func(cmd *cobra.Command,
 			return fmt.Errorf("failed to load registration file: %w", err)
 		}
 
+		if len(cfg.Runner.Labels) > 0 {
+			// overwirte the labels in the config file to the state file
+			reg.Labels = cfg.Runner.Labels
+			if err := config.SaveRegistration(cfg.Runner.File, reg); err != nil {
+				return fmt.Errorf("failed to save runner config: %w", err)
+			}
+		}
+
 		ls := labels.Labels{}
 		for _, l := range reg.Labels {
 			label, err := labels.Parse(l)
@@ -68,6 +76,11 @@ func runDaemon(ctx context.Context, configFile *string) func(cmd *cobra.Command,
 		)
 
 		runner := run.NewRunner(cfg, reg, cli)
+		// declare the labels of the runner before fetching tasks
+		err = runner.Declare(ctx, ls.Names())
+		if err != nil {
+			return fmt.Errorf("failed to declare runner: %w", err)
+		}
 		poller := poll.New(cfg, cli, runner)
 
 		poller.Poll(ctx)

internal/app/run/runner.go

@@ -13,6 +13,7 @@ import (
 	"time"
 
 	runnerv1 "code.gitea.io/actions-proto-go/runner/v1"
+	"github.com/bufbuild/connect-go"
 	"github.com/docker/docker/api/types/container"
 	"github.com/nektos/act/pkg/artifactcache"
 	"github.com/nektos/act/pkg/common"
@@ -214,3 +215,13 @@ func (r *Runner) run(ctx context.Context, task *runnerv1.Task, reporter *report.
 	reporter.SetOutputs(job.Outputs)
 	return execErr
 }
+
+func (r *Runner) Declare(ctx context.Context, labels []string) error {
+	_, err := r.client.Declare(ctx, connect.NewRequest(&runnerv1.DeclareRequest{
+		Labels: labels,
+	}))
+	if err != nil {
+		return err
+	}
+	return nil
+}

internal/pkg/labels/labels.go

@@ -82,3 +82,11 @@ func (l Labels) PickPlatform(runsOn []string) string {
 	// TODO: it may be not correct, what if the runner is used as host mode only?
 	return "node:16-bullseye"
 }
+
+func (l Labels) Names() []string {
+	names := make([]string, 0, len(l))
+	for _, label := range l {
+		names = append(names, label.Name)
+	}
+	return names
+}