Add last start logs to minikube logs output

cmd/minikube/main.go

@@ -22,12 +22,14 @@ import (
 	"fmt"
 	"log"
 	"os"
+	"path/filepath"
 	"regexp"
 	"strconv"
 
 	"github.com/spf13/pflag"
 	"k8s.io/klog/v2"
 
+	"k8s.io/minikube/pkg/minikube/localpath"
 	// Register drivers
 	_ "k8s.io/minikube/pkg/minikube/registry/drvs"
 
@@ -142,6 +144,7 @@ func setFlags() {
 			klog.Warningf("Unable to set default flag value for alsologtostderr: %v", err)
 		}
 	}
+	setLastStartFlags()
 
 	// make sure log_dir exists if log_file is not also set - the log_dir is mutually exclusive with the log_file option
 	// ref: https://github.com/kubernetes/klog/blob/52c62e3b70a9a46101f33ebaf0b100ec55099975/klog.go#L491
@@ -152,3 +155,24 @@ func setFlags() {
 		}
 	}
 }
+
+// setLastStartFlags sets the log_file flag to lastStart.txt if start command and user doesn't specify log_file or log_dir flags.
+func setLastStartFlags() {
+	if os.Args[1] != "start" {
+		return
+	}
+	if pflag.CommandLine.Changed("log_file") || pflag.CommandLine.Changed("log_dir") {
+		return
+	}
+	fp := localpath.LastStartLog()
+	dp := filepath.Dir(fp)
+	if err := os.MkdirAll(dp, 0755); err != nil {
+		klog.Warningf("Unable to make log dir %s: %v", dp, err)
+	}
+	if _, err := os.Create(fp); err != nil {
+		klog.Warningf("Unable to create/truncate file %s: %v", fp, err)
+	}
+	if err := pflag.Set("log_file", fp); err != nil {
+		klog.Warningf("Unable to set default flag value for log_file: %v", err)
+	}
+}

pkg/minikube/localpath/localpath.go

@@ -74,6 +74,11 @@ func AuditLog() string {
 	return filepath.Join(MiniPath(), "logs", "audit.json")
 }
 
+// LastStartLog returns the path to the last start log.
+func LastStartLog() string {
+	return filepath.Join(MiniPath(), "logs", "lastStart.txt")
+}
+
 // ClientCert returns client certificate path, used by kubeconfig
 func ClientCert(name string) string {
 	new := filepath.Join(Profile(name), "client.crt")

pkg/minikube/logs/logs.go

@@ -34,6 +34,7 @@ import (
 	"k8s.io/minikube/pkg/minikube/command"
 	"k8s.io/minikube/pkg/minikube/config"
 	"k8s.io/minikube/pkg/minikube/cruntime"
+	"k8s.io/minikube/pkg/minikube/localpath"
 	"k8s.io/minikube/pkg/minikube/out"
 	"k8s.io/minikube/pkg/minikube/style"
 )
@@ -190,10 +191,15 @@ func Output(r cruntime.Manager, bs bootstrapper.Bootstrapper, cfg config.Cluster
 	}
 
 	if err := outputAudit(lines); err != nil {
-		klog.Error(err)
+		klog.Errorf("failed to output audit logs: %v", err)
 		failed = append(failed, "audit")
 	}
 
+	if err := outputLastStart(); err != nil {
+		klog.Errorf("failed to output last start logs: %v", err)
+		failed = append(failed, "last start")
+	}
+
 	if len(failed) > 0 {
 		return fmt.Errorf("unable to fetch logs for: %s", strings.Join(failed, ", "))
 	}
@@ -212,6 +218,31 @@ func outputAudit(lines int) error {
 	return nil
 }
 
+// outputLastStart outputs the last start logs.
+func outputLastStart() error {
+	out.Step(style.Empty, "")
+	out.Step(style.Empty, "==> Last Start <==")
+	fp := localpath.LastStartLog()
+	f, err := os.Open(fp)
+	if os.IsNotExist(err) {
+		msg := fmt.Sprintf("Last start log file not found at %s", fp)
+		out.Step(style.Empty, msg)
+		return nil
+	}
+	if err != nil {
+		return fmt.Errorf("failed to open file %s: %v", fp, err)
+	}
+	defer f.Close()
+	s := bufio.NewScanner(f)
+	for s.Scan() {
+		out.Step(style.Empty, s.Text())
+	}
+	if err := s.Err(); err != nil {
+		return fmt.Errorf("failed to read file %s: %v", fp, err)
+	}
+	return nil
+}
+
 // logCommands returns a list of commands that would be run to receive the anticipated logs
 func logCommands(r cruntime.Manager, bs bootstrapper.Bootstrapper, cfg config.ClusterConfig, length int, follow bool) map[string]string {
 	cmds := bs.LogCommands(cfg, bootstrapper.LogOptions{Lines: length, Follow: follow})

test/integration/functional_test.go

@@ -797,7 +797,7 @@ func validateLogsCmd(ctx context.Context, t *testing.T, profile string) {
 	if err != nil {
 		t.Errorf("%s failed: %v", rr.Command(), err)
 	}
-	expectedWords := []string{"apiserver", "Linux", "kubelet", "Audit"}
+	expectedWords := []string{"apiserver", "Linux", "kubelet", "Audit", "Last Start"}
 	switch ContainerRuntime() {
 	case "docker":
 		expectedWords = append(expectedWords, "Docker")