feat: refactor to ymsctl & yms-daemon

internal/backendexecutor/executor.go

@@ -3,6 +3,7 @@
 package backendexecutor
 
 import (
+	"bufio"
 	"context"
 	"encoding/json"
 	"errors"
@@ -62,6 +63,8 @@ type Request struct {
 	ConfigLocation       string
 	RestartPolicy        containerengine.RestartPolicy
 	HealthEndpoint       string
+	StartLog             bool
+	LogReporter          func(string)
 }
 
 // Executor drives the persisted transaction up to SWITCHING after the new container is healthy.
@@ -210,6 +213,21 @@ func (e *Executor) startAndCheck(ctx context.Context, transactionID string, requ
 	if _, err := e.coordinator.ExecuteStep(ctx, transactionID, startIntent(request), startOperation); err != nil {
 		return err
 	}
+	if request.StartLog && request.LogReporter != nil {
+		logs, err := e.engine.ContainerLogs(ctx, request.ContainerName)
+		if err == nil {
+			scanner := bufio.NewScanner(logs)
+			for scanner.Scan() {
+				request.LogReporter(scanner.Text())
+			}
+			_ = logs.Close()
+			if err := scanner.Err(); err != nil {
+				return fmt.Errorf("read container startup logs: %w", err)
+			}
+		} else {
+			request.LogReporter("unable to read container startup logs: " + err.Error())
+		}
+	}
 	healthOperation := &healthOperation{
 		engine:   e.engine,
 		checker:  e.checker,

internal/backendexecutor/executor_test.go

@@ -10,6 +10,7 @@ import (
 	"os"
 	"path/filepath"
 	"slices"
+	"strings"
 	"sync"
 	"testing"
 
@@ -408,6 +409,10 @@ func (e *fakeEngine) StartContainer(_ context.Context, name string) error {
 	return nil
 }
 
+func (e *fakeEngine) ContainerLogs(context.Context, string) (io.ReadCloser, error) {
+	return io.NopCloser(strings.NewReader("")), nil
+}
+
 func (e *fakeEngine) StopContainer(_ context.Context, name string) error {
 	e.mu.Lock()
 	defer e.mu.Unlock()